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Data Translation DT9838 User Manual

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UM-24789-G
DT9838
User's Manual

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  • Page 1 Title Page UM-24789-G DT9838 User’s Manual...
  • Page 2 Information furnished by Data Translation, Inc. is believed to be accurate and reliable; however, no responsibility is assumed by Data Translation, Inc. for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
  • Page 3 Changes or modifications to this equipment not expressly approved by Data Translation could void your authority to operate the equipment under Part 15 of the FCC Rules.

  • Page 5: Table Of Contents

    Configuring the DT9838 Device Driver ........
  • Page 6 Contents Wiring a Half-Bridge Bending Circuit ........56 Remote Sensing In Half-Bridge Bending Configurations .
  • Page 7 Synchronizing Acquisition on Multiple Modules ....... . . 114 Triggering DT9838 and DT9837 Series Modules Using the Sync Bus ... . . 116 Chapter 6: Supported Device Driver Capabilities.
  • Page 8 Contents Counter/Timers ............. 129 Tachometers.

  • Page 9: About This Manual

    About this Manual The first part of this manual describes how to install and set up your DT9838 module and device driver, and verify that your module is working properly. The second part of this manual describes the features of the DT9838 module, the capabilities of the DT9838 Device Driver, and how to program the DT9838 module using DT-Open Layers for .NET Class Library™...

  • Page 10: Conventions Used In This Manual

    • Courier font is used to represent source code. Related Information Refer to the following documents for more information on using the DT9838 module: • Benefits of the Universal Serial Bus for Data Acquisition. This white paper describes why USB is an attractive alternative for data acquisition.

  • Page 11: Where To Get Help

    About this Manual Where To Get Help Should you run into problems installing or using a DT9838 module, our Technical Support Department is available to provide technical assistance. Refer to Chapter 7 starting on page for information on how to contact the Technical Support Department. If you are outside the U.S.
  • Page 12 About this Manual...

  • Page 13: Chapter 1: Overview

    Overview DT9838 Hardware Features ........... .

  • Page 14: Dt9838 Hardware Features

    It is compatible with USB 2.0 and USB 1.1 ports. Figure 1: DT9838 Module The key hardware features of the DT9838 are as follows: • Simultaneous measurement of four 24-bit analog input channels and one tachometer in the analog input stream •...
  • Page 15 • Software-programmable trigger type (software, external digital trigger, or variable digital threshold trigger) to start analog input operations • Sync Bus (RJ45) connector for synchronizing acquisition on up to four DT9838 modules • LEDs for monitoring the arm/trigger state and USB status Note: A board-level version of this module (without the enclosure) is also available for OEM applications.

  • Page 16: Supported Software

    Chapter 1 Supported Software The following software is available for use with the DT9838 module and is included on the Data Acquisition OMNI CD: • DT9838 Device Driver – The DT9838 Device Driver allows you to use a DT9838 module with any of the supported software packages or utilities.
  • Page 17 • DT-Open Layers for .NET Class Library – Use this class library if you want to use Visual C# or Visual Basic for .NET to develop your own application software for a DT9838 module using Visual Studio 2003 to 2012; the class library complies with the DT-Open Layers standard.
  • Page 18 • LV-Link – A link to LV-Link is included on the Data Acquisition OMNI CD. Use LV-Link if you want to use the LabVIEW graphical programming language to access the capabilities of the DT9838 module. Refer to the Data Translation web site (www.datatranslation.com) for information about selecting the right software package for your needs.

  • Page 19: Supported Accessories

    Overview Supported Accessories The following accessories are available for the DT9838 module: • STP STRAIN General-Purpose Accessory – This accessory contains four general-purpose screw terminal panels. Use one screw terminal panel for each channel. Figure 2: STP STRAIN General-Purpose Accessory •...
  • Page 20 • EP398 RJ50 cables – The EP398 accessory contains four RJ50 cables that are used to connect four STP STRAIN, STP STRAIN 120, or STP STRAIN 350 screw terminal panels to the DT9838 module. Figure 5 shows an RJ50 cable.
  • Page 21 • EP394 +5 V external power supply – Use this optional power supply, shown in Figure 6, if you want to use an external +5 V power supply to power the DT9838 module. Refer to page 31 for information on using internal USB power or external +5 V power to power the DT9838 module.

  • Page 22: Getting Started Procedure

    Figure 8 illustrates the steps needed to get started using the DT9838 module. This diagram is repeated in each Getting Started chapter; the shaded area in the diagram shows you where you are in the procedure. Set Up and Install the Module...

  • Page 23: Getting Started Procedure

    Part 1: Getting Started...

  • Page 25: Chapter 2: Setting Up And Installing The Module

    Computer..........Configuring the DT9838 Device Driver...
  • Page 26 Chapter 3 starting on page Verify the Operation of the Module (see Chapter 4 starting on page Note: The DT9838 module is factory-calibrated. If you decide that you want to recalibrate the analog input circuitry, refer to the instructions on Chapter...

  • Page 27: Unpacking

    • DT9838 module • Data Acquisition OMNI CD If an item is missing or damaged, contact Data Translation. If you are in the United States, call the Customer Service Department at (508) 481-3700, ext. 1323. An application engineer will guide you through the appropriate steps for replacing missing or damaged items. If you are located outside the United States, call your local distributor, listed on Data Translation’s web...

  • Page 28: System Requirements

    Chapter 2 System Requirements For reliable operation, ensure that your computer meets the following system requirements: • Processor: Pentium 4/M or equivalent • RAM: 1 GB • Screen Resolution: 1024 x 768 pixels • Operating System: Windows 8, Windows 7, or Windows Vista (32- and 64-bit) •...

  • Page 29: (Optional) Applying Power To The Module

    4 channels 4 channels To attach an external power supply to the module, do the following: 1. Connect the +5 V power supply (EP394) to the auxiliary power connector on the DT9838 module, as shown in Figure 2. Plug the power supply into a wall outlet.
  • Page 30 Chapter 2 Auxiliary Power Connector DT9838 Module EP394 +5 V Power Supply To wall outlet Figure 9: Attaching an External +5 V Power Supply to the DT9838 Module...

  • Page 31: Attaching Modules To The Computer

    Connecting Directly to the USB Ports To connect a DT9838 module directly to a USB port on your computer, do the following: 1. Attach one end of the USB cable to the USB port on the module.

  • Page 32: Connecting To An Expansion Hub

    Connecting to an Expansion Hub Expansion hubs are powered by their own external power supply. The practical number of DT9838 modules that you can connect to a single USB port depends on the throughput you want to achieve. To connect multiple DT9838 modules to an expansion hub, do the following: 1.
  • Page 33 Setting Up and Installing the Module DT9838 Module USB Cables DT9838 Module Host Computer USB Cable USB Cable Power Supply Expansion Hubs for Hub Power Supply for Hub DT9838 DT9838 Module Module USB Cables Figure 11: Attaching Multiple Modules Using Expansion Hubs...

  • Page 34: Configuring The Dt9838 Device Driver

    Windows 7, Windows 8, and Vista (64-bit) C:\Windows\SysWOW64\Dtolcpl.cpl To configure the device driver for the DT9838 module, do the following: 1. If you have not already done so, power up the host computer and all peripherals. 2. From the Windows Start menu, select Settings|Control Panel.

  • Page 35: Chapter 3: Wiring Signals

    Wiring Signals Preparing to Wire Signals ............Connecting a General-Purpose or Bridge-Completion Accessory .
  • Page 36 Chapter 3 Set Up and Install the Module (see Chapter 2 starting on page Wire Signals (this chapter) Verify the Operation of the Module (see Chapter 4 starting on page...

  • Page 37: Preparing To Wire Signals

    Preparing to Wire Signals Figure 12 shows the connectors of the DT9838 module. The left side of the DT9838 module contains four analog input (RJ50) connectors for connecting strain gages, load cells and other sensors, and/or voltage input signal. The right side of the DT9838 module provides the following connectors: •...

  • Page 38: General Wiring Recommendations

    • Separate power and signal lines by using physically different wiring paths or conduits. • To avoid noise, do not locate the DT9838 module and cabling next to sources that produce high electromagnetic fields, such as large electric motors, power lines, solenoids, and electric arcs, unless the signals are enclosed in a mumetal shield.

  • Page 39: Analog Input Connector Pin Assignments (Rj50 Connector)

    Wiring Signals Analog Input Connector Pin Assignments (RJ50 Connector) For analog input channels 0 to 3, the DT9838 module provides RJ50 connectors, shown in Figure 13, for connecting strain gages, load-cell sensors, and/or voltage inputs. Table 2 lists the pin assignments for the RJ50 connectors.

  • Page 40: Connecting A General-Purpose Or Bridge-Completion Accessory

    Figure 14: Layout of the STP STRAIN, STP STRAIN 120, and STP STRAIN 350 Accessories The screw terminal assignments of the STP STRAIN, STP STRAIN 120, and STP STRAIN 350 screw terminal panels, listed in Table 3, match the pin designations of the RJ50 analog input connectors on the DT9838.
  • Page 41 The optional EP398 contains four RJ50 cables. Use an RJ50 cable to connect the RJ50 connector on the STP STRAIN, STP STRAIN 120, or STP STRAIN 350 screw terminal panel to the RJ50 connector on the DT9838 module, as shown in Figure...

  • Page 42: Connecting Quarter-Bridge Circuits

    • Quarter-Bridge (Axial and Bending) • Quarter-Bridge Temp Comp This section describes how to wire the Quarter-Bridge and Quarter-Bridge Temp Comp circuits to the DT9838 module. For more information about these bridge configuration types, refer to page Wiring a Quarter-Bridge (Axial and Bending) Circuit...
  • Page 43 Note: In some cases, you may wish to use a rosette, which is arrangement of two or three closely positioned strain gage grids that are oriented to measure the normal strains along different directions in the underlying surface of a test material. The DT9838 supports rectangular and delta rosettes; tee rosettes are not supported.
  • Page 44 R is 350 to match the value of resistor R Figure 17: Connecting a Quarter-Bridge Circuit to the DT9838 When Using the STP STRAIN 120 or STP STRAIN 350 Quarter-Bridge Completion Accessory Figure 18 shows how to connect a Quarter Bridge circuit to the DT9838 when using the general-purpose STP STRAIN accessory.

  • Page 45: Remote Sensing In Quarter-Bridge Configurations

    EXC+ and EXC– lines. Figure 19 shows how to connect a Quarter Bridge circuit to the DT9838 using remote sense lines. In this example, the general-purpose STP STRAIN accessory is used and the user-supplied resistor is mounted at the strain gage.

  • Page 46: Shunt Calibration In Quarter-Bridge Configurations

    100 kO RSHUNT+ TEDS Figure 19: Connecting a Quarter-Bridge Circuit to the DT9838 and General-Purpose STP STRAIN Accessory when the Completion Resistor is Mounted at the Strain Gage and the Remote Sense Lines are Used Shunt Calibration in Quarter-Bridge Configurations...

  • Page 47: Wiring A Quarter-Bridge Temp Comp Circuit

    Wiring Signals Wiring a Quarter-Bridge Temp Comp Circuit The Quarter-Bridge Temp Comp configuration, shown in Figure 20, measures axial and bending strain and compensates for temperature. Note: This configuration is often confused with the more commonly used Half-Bridge Poisson configuration, described on page 52.

  • Page 48: Remote Sensing In Quarter-Bridge Temp Comp Configurations

    RSHUNT+ TEDS RJ50 Figure 21: Connecting a Quarter Bridge Temp Comp Circuit to the DT9838 When Using the General-Purpose STP STRAIN Accessory and Remote Sensing Remote Sensing In Quarter-Bridge Temp Comp Configurations Although not required for operation in Quarter-Bridge Temp Comp configurations, it is recommended that you connect the bridge SENSE+ and SENSE–...

  • Page 49: Shunt Calibration In Quarter-Bridge Temp Comp Configurations

    RSHUNT+ TEDS RJ50 Figure 22: Connecting a Quarter Bridge Temp Comp Circuit to the DT9838 When Using the General-Purpose STP STRAIN Accessory Without Remote Sensing Shunt Calibration in Quarter-Bridge Temp Comp Configurations When setting up your strain gage, you can use shunt calibration to correct for errors due to lead wire resistance (R ) in the excitation wiring.

  • Page 50: Connecting Half-Bridge Circuits

    • Half-Bridge Poisson (Bending or Axial) • Half-Bridge Bending This section describes how to wire the Half-Bridge Poisson and Half-Bridge Bending circuits to the DT9838 module. The wiring diagram is the same for all half-bridge configurations; however, the meaning of R and R differs depending on the configuration you choose.
  • Page 51 Figure 24 shows how to connect a Half-Bridge Poisson circuit to the DT9838 when using the general-purpose STP STRAIN accessory and remote sensing. Note: When remote sensing is used, enter 0 Ω for the lead wire correction coefficient in software.

  • Page 52: Remote Sensing In Half-Bridge Poisson Configurations

    24-bit −νε Ω Precision 10 k 10 kO Instrumentation Amp SENSE- EXC- RSHUNT- Ω 100 k 100kO RSHUNT+ TEDS RJ50 Figure 25: Connecting a Half-Bridge Poisson Circuit to the DT9838 When Using the General-Purpose STP STRAIN Accessory Without Remote Sensing...

  • Page 53: Shunt Calibration In Half-Bridge Poisson Configurations

    Using software, you can then measure the output of the bridge, compare it to the expected bridge output value, and adjust the gain of the DT9838 to compensate for these errors. Once you have performed the shunt calibration procedure, you can disconnect the RSHUNT+ and RSHUNT–...

  • Page 54: Wiring A Half-Bridge Bending Circuit

    Figure 27 shows how to connect a Half-Bridge Bending circuit to the DT9838 when using the general-purpose STP STRAIN accessory and remote sensing. Note: When remote sensing is used, enter 0 Ω for the lead wire correction coefficient in software.

  • Page 55: Remote Sensing In Half-Bridge Bending Configurations

    RSHUNT+ TEDS RJ50 Figure 27: Connecting a Half-Bridge Bending Circuit to the DT9838 When Using the General-Purpose STP STRAIN Accessory and Remote Sensing Remote Sensing In Half-Bridge Bending Configurations Although not required for operation in Half-Bridge Bending configurations, it is recommended that you connect the bridge SENSE+ and SENSE–...

  • Page 56: Shunt Calibration In Half-Bridge Bending Configurations

    Using software, you can then measure the output of the bridge, compare it to the expected bridge output value, and adjust the gain of the DT9838 to compensate for these errors. Once you have performed the shunt calibration procedure, you can disconnect the RSHUNT+ and RSHUNT–...

  • Page 57: Connecting Full-Bridge Circuits

    • Full-Bridge Axial Poisson This section describes how to wire the Full-Bridge Bending, Full-Bridge Bending Poisson, and Full-Bridge Bending configurations to the DT9838 module. The wiring diagram is the same for all full-bridge configurations; however, the meaning of R , and R differs depending on the configuration you choose.
  • Page 58 Figure 30 shows how to connect a Full-Bridge Bending circuit to the DT9838 when using the general-purpose STP STRAIN accessory and remote sensing. Note: When remote sensing is used, enter 0 Ω for the lead wire correction coefficient in software.

  • Page 59: Remote Sensing In Full-Bridge Bending Configurations

    RSHUNT+ TEDS RJ50 Figure 31: Connecting a Full-Bridge Bending Circuit to the DT9838 When Using the General-Purpose STP STRAIN Accessory Without Remote Sensing Shunt Calibration in Full-Bridge Bending Configurations When setting up your strain gage, you can use shunt calibration to correct for errors due to lead wire resistance (R ) in the excitation wiring.

  • Page 60: Wiring A Full-Bridge Bending Poisson Configuration

    Using software, you can then measure the output of the bridge, compare it to the expected bridge output value, and adjust the gain of the DT9838 to compensate for these errors. Once you have performed the shunt calibration procedure, you can disconnect the RSHUNT+ and RSHUNT–...

  • Page 61: Remote Sensing In Full-Bridge Bending Poisson Configurations

    RSHUNT+ TEDS RJ50 Figure 33: Connecting a Full-Bridge Bending Poisson Circuit to the DT9838 When Using the General-Purpose STP STRAIN Accessory and Remote Sensing Remote Sensing in Full-Bridge Bending Poisson Configurations Although not required for operation, it is recommended that you connect the bridge SENSE+ and SENSE–...

  • Page 62: Shunt Calibration In Full-Bridge Bending Poisson Configurations

    Using software, you can then measure the output of the bridge, compare it to the expected bridge output value, and adjust the gain of the DT9838 to compensate for these errors.

  • Page 63: Wiring A Full-Bridge Axial Poisson Circuit

    Figure 36 shows how to connect a Full-Bridge Axial Poisson circuit to the DT9838 when using the general-purpose STP STRAIN accessory and remote sensing. Note: When remote sensing is used, enter 0 Ω for the lead wire correction coefficient in software.

  • Page 64: Remote Sensing In Full-Bridge Axial Poisson Configurations

    RSHUNT+ TEDS RJ50 Figure 36: Connecting a Full-Bridge Axial Poisson Circuit to the DT9838 When Using the General-Purpose STP STRAIN Accessory and Remote Sensing Remote Sensing in Full-Bridge Axial Poisson Configurations Although not required for operation, it is recommended that you connect the bridge SENSE+ and SENSE–...

  • Page 65: Shunt Calibration In Full-Bridge Axial Poisson Configurations

    Using software, you can then measure the output of the bridge, compare it to the expected bridge output value, and adjust the gain of the DT9838 to compensate for these errors.

  • Page 66: Connecting Load Cells And Other Transducers

    Figure 39 shows how to connect load cells and other sensors that do not use remote sensing to the DT9838 when connected to the general-purpose STP STRAIN accessory. Notes: In load-cell configurations, the RSHUNT– and RSHUNT+ lines are not used, but optionally can be connected at the DT9838.
  • Page 67 AIN- Ω Precision 10 k 10 kΩ Instrumentation Amp SENSE - EXC - RSHUNT- Ω 100 kΩ 100 k RSHUNT+ DATA TEDS TEDS RJ50 Figure 39: Connecting a Load Cell or Other Transducer to the DT9838 Without Using Remote Sensing...

  • Page 68: Connecting Voltage Inputs

    Connecting Voltage Inputs Figure 40 shows how to connect a voltage input source to a channel of the DT9838 when it is connected to a general-purpose STP STRAIN accessory. Note that the voltage source must be in the ±250 mV full-scale range.

  • Page 69: Connecting A Tachometer Input Signal

    Refer to page 112 for more information on tachometer measurements. Ext Trigger and Tachometer Connector Tachometer Return - Pin 2 Tachometer In - Pin 1 Signal Source Figure 41: Connecting a Tachometer Input Signal to the DT9838 Module...

  • Page 70: Connecting An External Trigger Signal

    112 for more information on the external digital trigger. Ext Trigger and Tachometer Connector External Trigger Return - Pin 4 External Trigger - Pin 3 Trigger Source Figure 42: Connecting an External Trigger Input Signal to the DT9838 Module...

  • Page 71: Chapter 4: Verifying The Operation Of A Module

    Verifying the Operation of a Module Select the Device ............. . Measure Strain Gage Data.
  • Page 72 QuickDAQ allows you to acquire and analyze data from all Data Translation USB and Ethernet devices, except the DT9841 Series, DT9817, DT9835, and DT9853/54. This chapter describes how to verify the operation of a DT9838 module using the QuickDAQ base version.

  • Page 73: Select The Device

    USB devices in the drop-down list. If you want to refresh this list to determine if other devices are available, click Refresh. 4. Select the module name for the DT9838 module that you want to use from the list of Available Devices, and click Add.
  • Page 74 The DT9838 devices support that capability of synchronizing up to four devices. If you are using more than one of these devices, ensure that you connect the devices together using network cables and the Synchronization (RJ45) connector on each device.
  • Page 75 Verifying the Operation of a Module...

  • Page 76: Measure Strain Gage Data

    Configure the channels as follows: 1. Ensure that the strain gage is connected to your data acquisition device. In this example, the strain gage is connected to analog input channel 0 of the DT9838. Refer to Figure 30 on page 60 for the wiring diagram used for a full-bridge bending configuration.
  • Page 77 Verifying the Operation of a Module 7. Select Strain Gage, and click Next. (Note that TEDS is not supported for this sensor; therefore, you do not need to click the Open TEDS data file... button.) A screen similar to the following appears:...
  • Page 78 Chapter 4 8. For the Bridge Type field, select the bridge configuration of your strain gage. In this example, the Full Bridge Bending bridge configuration is used. 9. For the Excitation Voltage field, enter the excitation voltage value for your strain gage. In this example, 5 V is used as the excitation voltage value.
  • Page 79 Verifying the Operation of a Module 15. For the Max Range field, enter the maximum value of the range for your strain gage. In this example, 1000 is used as the maximum strain value. 16. For the Units field, select the engineering units for the strain gage. In this example, μStrain is used.
  • Page 80 Chapter 4 21. Ensure that the bride is in the unstrained state, and the click the Calibrate button to perform offset nulling procedure. The expected voltage is shown along with the calibrated offset voltage.
  • Page 81 Verifying the Operation of a Module 22. Click Next. A screen similar to the following appears:...
  • Page 82 23. For the Select Resistor Source field, select Internal if you are using the internal shunt resistor provided on the DT9838 module to perform shunt calibration, or External if you are using your own external resistor to perform shunt calibration.
  • Page 83 Verifying the Operation of a Module 26. Click Finish. 27. If desired, enter a test point number under the Point # column. In this example, 1 is used. 28. Click Close to close the Configure Devices dialog box.

  • Page 84: Configure The Recording Settings

    Chapter 4 Configure the Recording Settings For this example, configure the recording settings as follows: 1. Click the Recording tab of the Acquisition Config window. 2. For Filename generation, use the default Filename option. 3. For Filename, use the default name for the data file. 4.

  • Page 85: Configure The Acquisition Settings

    Verifying the Operation of a Module 5. For Acquisition Duration, enter 5 seconds. The number of seconds for the total run and the amount of available disk space are shown. 6. For X Span Axis, enter 5 seconds. Configure the Acquisition Settings For this example, configure the acquisition settings as follows: 1.

  • Page 86: Start The Operation

    Chapter 4 2. For the Per Channel Sampling Frequency text box, enter 1000. The sampling rate, sample interval, and number of scans are displayed. 3. For the Trigger Source check box, select Software to ensure that the measurement starts as soon as the Record button is clicked. Start the Operation Once you have configured the channels, start acquisition and log data to disk by clicking the Record toolbar button (...
  • Page 87 Part 2: Using Your Module...

  • Page 89: Chapter 5: Principles Of Operation

    Principles of Operation Analog Input Features ............Tachometer Input Features .
  • Page 90 Chapter 5 Figure 43 shows a block diagram of the DT9838 module. Trigger LVDS In/Out Tach Tach Sync LVDS SyncBus Sync In/Out Trigger Sync LVDS RJ45 Trigger Clock 4 pos In/Out Screw Terminal ID/CAL SRAM EXC + Bridge Bridge SENSE+...

  • Page 91: Analog Input Features

    111 Analog Input Channels The DT9838 module supports four, simultaneous, analog input channels that accept bridge sensors through RJ50 connectors on the module. You can acquire data from a single analog input channel or from a group of analog input channels on the module.

  • Page 92: Bridge Configurations

    Chapter 5 The DT9838 module also allows you to read the value of the tachometer input in the analog input data stream. This feature is particularly useful when you want to correlate the analog input measurements with tachometer data. Refer to...
  • Page 93 The following sections provide the circuit diagram for each of the supported bridge configurations as well as the bridge transfer function that the DT9838 uses to convert voltage to strain for each configuration. The following terms are used in this section: •...

  • Page 94: Quarter-Bridge Configuration

    Vs Vu – ------------------ - Quarter-Bridge Configuration Figure 45 shows the circuit diagram that the DT9838 uses for a 3-wire Quarter-Bridge configuration. Note: This configuration is used with rectangular and delta rosettes. Tee rosettes are not supported. Refer to page 44 for more information on rosettes.

  • Page 95: Quarter-Bridge Temp Comp Configuration

    Quarter-Bridge Temp Comp Configuration Figure 46 shows the circuit diagram that the DT9838 uses for the Quarter-Bridge Temp Comp configuration. This circuit diagram (and bridge transfer function) is also used for a Quarter-Bridge configuration where the user places a resistor at the strain gage.

  • Page 96: Half-Bridge Bending Configuration

    Refer to page 52 for information on wiring a Half-Bridge Poisson configuration to the DT9838. Half-Bridge Bending Configuration Figure 48 shows the circuit diagram that the DT9838 uses for the Half-Bridge Bending configuration. In this diagram: ε and R are half-bridge completion resistors that are provided by the DT9838.

  • Page 97: Full-Bridge Bending Circuit

    Refer to page 56 for information on wiring a Half-Bridge Bending configuration to the DT9838. Full-Bridge Bending Circuit Figure 49 shows the circuit diagram that the DT9838 uses for the Full-Bridge Bending configuration. In this diagram: ε ε (– Four active strain gage elements are used.

  • Page 98: Full-Bridge Bending Poisson Configuration

    Chapter 5 Full-Bridge Bending Poisson Configuration Figure 50 shows the circuit diagram that the DT9838 uses for the Full-Bridge Bending Poisson configuration. In this diagram: ε νε) (– Four active strain gage elements are used. ε ε (– ) and R...

  • Page 99: Full-Bridge Axial Poisson Configuration

    DT9838. Transducer Support In addition to strain gages, the DT9838 supports a variety of transducer types, including load cells, pressure transducers, and torque sensors that are based on the Wheatstone bridge. A load cell, which consists of a number of strain gages, measures load and force by determining the deformation of a structural member as a load or force is applied.

  • Page 100: Bridge Excitation

    Each channel is also individually current limited to 50 mA. The DT9838 can be operated on USB power alone; however, you may not be able to use all the channels depending on the bridge resistance and excitation voltage. Alternatively, you can powered the DT9838 using an external 5 VDC to 24 VDC power supply.

  • Page 101: Shunt Calibration

    You can use either your own external resistor or the internal 100 kΩ resistor on the DT9838 module. Using software, you can then read the value of the bridge, compare it to the expected value, and calibrate the channel accordingly.

  • Page 102: Comp Configurations

    -------------------------- - Shunt Calibration Equation for the Quarter-Bridge and Quarter-Bridge Temp Comp Configurations The DT9838 uses the following bridge transfer function when lead wire correction and shunt calibration is used across R or R of the Quarter-Bridge or Quarter-Bridge Temp Comp circuit: ...

  • Page 103: Shunt Calibration Equation For The Full-Bridge Bending Configuration

    Principles of Operation Shunt Calibration Equation for the Full-Bridge Bending Configuration The DT9838 uses the following bridge transfer function when lead wire correction and shunt calibration is used across R , or R of the Full-Bridge Bending configuration:  ε...

  • Page 104: Input Resolution

    Chapter 5 Input Resolution The value that is measured across the bridge of an analog input channel on the DT9838 module is amplified and applied to the 24-bit Sigma-Delta analog-to-digital converter (ADC). The ADC oversamples the incoming signal, filters the values, and produces a result.

  • Page 105: Analog Input Conversion Modes

    Continuous Scan Mode Continuous scan mode takes full advantage of the capabilities of the DT9838 module. Use continuous scan mode if you want to accurately control the period between successive simultaneous conversions of all channels in a channel list. You can specify a channel list, clock source, start trigger, reference trigger, post-trigger scan count, and buffer using software.
  • Page 106 Chapter 5 The conversion rate is determined by the frequency of the input sample clock; refer to page for more information about the input sample clock. The sample rate, which is the rate at which a single entry in the channel list is sampled, is the same as the conversion rate due to the simultaneous nature of the module.

  • Page 107: Input Triggers

    A trigger is an event that occurs based on a specified set of conditions. On the DT9838 module, you can specify a start trigger source and a reference trigger source. Pre-trigger data acquisition starts when the start trigger event occurs. When the reference trigger event occurs, pre-trigger data acquisition stops and post-trigger acquisition starts.

  • Page 108: Reference Trigger Sources

    Series modules) are connected together using the Sync Bus (RJ45) connector, you can set the reference trigger of a slave DT9838 module to Sync Bus if you want to receive a Sync Bus trigger from one of the other modules to stop pre-trigger acquisition and start post-trigger acquisition.

  • Page 109: Data Format

    Principles of Operation Data Format The DT9838 module uses offset binary data encoding, where 000000 represents –250 mV and FFFFFFh represents +250 mV. Use software to specify the data encoding as binary. The ADC outputs FFFFFFh for above-range signals, and 000000 for below-range signals.

  • Page 110: Tachometer Input Features

    You can connect a tachometer signal with a range of ±30 V to pins 1 and 2 of the External Trigger and Tachometer (J6) connector on the DT9838 module. This signal has a maximum frequency of 1 MHz and a minimum pulse width of 0.4 μs. The threshold voltage is fixed at +2 V with 0.5 V of hysteresis.
  • Page 111 Principles of Operation Table 4: An Example of Reading the Tachometer Input as Part of the Analog Input Data Stream Tachometer Time A/D Value Input Value Status of Operation 5002 Operation started, but is not complete 5004 Operation not complete 5003 Operation not complete 5002...

  • Page 112: Synchronizing Acquisition On Multiple Modules

    Sync Bus is used as the start trigger. When configured as none (the default mode), the DT9838 module uses the USB clock instead of the Sync Bus connector. The synchronization mode remains set until changed or until the application exits.
  • Page 113 (Shown Using an External Trigger) When synchronizing multiple modules, start the slave modules before starting the master module. When the master DT9838 module is triggered (using the software trigger, external digital trigger, or threshold trigger), both the master and the slave modules start acquiring data at the same time (within one A/D conversion of the clock).

  • Page 114: Triggering Dt9838 And Dt9837 Series Modules Using The Sync Bus

    When configured as a slave, the DT9837 processes a single Sync Bus trigger; the Sync Bus trigger is considered the start trigger and is received and/or driven out as such. Consider the case where the DT9838 is the master and a DT9837 Series module is the slave, as shown in Figure...
  • Page 115 The reference trigger on the master DT9837 Series module can be the threshold trigger. The start trigger on the slave DT9838 is ignored, since the Sync Bus is used as the start trigger. The reference trigger on the slave DT9838 module can be an external digital trigger or threshold trigger (the Sync Bus trigger is not supported as a reference trigger in this configuration), or you can use software to stop the DT9838 module and correlate the data.
  • Page 116 Chapter 5...

  • Page 117: Chapter 6: Supported Device Driver Capabilities

    Supported Device Driver Capabilities Data Flow and Operation Options..........Buffering .

  • Page 118: Options

    The tables in this chapter summarize the features available for use with the DT-Open Layers for .NET Class Library and the DT9838 module. The DT-Open Layers for .NET Class Library provides properties that return support information for specified subsystem capabilities.

  • Page 119: Data Flow And Operation Options

    Supported Device Driver Capabilities Data Flow and Operation Options Table 6: Data Flow and Operation Options DT9838 DOUT TACH QUAD Single-Value Operation Support SupportsSingleValue Simultaneous Single-Value Output Operations SupportsSetSingleValues Continuous Operation Support SupportsContinuous Continuous Operation until Trigger SupportsContinuousPreTrigger Continuous Operation before & after Trigger...

  • Page 120: Buffering

    Chapter 6 Buffering Table 7: Buffering Options DT9838 DOUT TACH QUAD Buffer Support SupportsBuffering Single Buffer Wrap Mode Support SupportsWrapSingle Inprocess Buffer Flush Support SupportsInProcessFlush Triggered Scan Mode Table 8: Triggered Scan Mode Options DT9838 DOUT TACH QUAD Triggered Scan Support...

  • Page 121: Channels

    Supported Device Driver Capabilities Channels Table 10: Channel Options DT9838 DOUT TACH QUAD Number of Channels NumberOfChannels SE Support SupportsSingleEnded SE Channels MaxSingleEndedChannels DI Support SupportsDifferential DI Channels MaxDifferentialChannels Maximum Channel-Gain List Depth CGLDepth Simultaneous Sample-and-Hold Support SupportsSimultaneousSampleHold Channel-List Inhibit...

  • Page 122: Ranges

    Chapter 6 Ranges Table 12: Range Options DT9838 DOUT TACH QUAD Number of Voltage Ranges NumberOfRanges Available Ranges SupportedVoltageRanges ±0.25 V Resolution Table 13: Resolution Options DT9838 DOUT TACH QUAD Software Programmable Resolution SupportsSoftwareResolution Number of Resolutions NumberOfResolutions Available Resolutions...

  • Page 123: Thermocouple, Rtd, And Thermistor Support

    Supported Device Driver Capabilities Thermocouple, RTD, and Thermistor Support Table 15: Thermocouple, RTD, and Thermistor Support Options DT9838 DOUT TACH QUAD Thermocouple Support SupportsThernocouple RTD Support SupportsRTD Thermistor Support SupportsThermistor Voltage Converted to Temperature in Hardware SupportsTemperatureDataInStream Supported Thermocouple Types...

  • Page 124: Iepe Support

    Chapter 6 IEPE Support Table 16: IEPE Support Options DT9838 DOUT TACH QUAD IEPE Support SupportsIEPE Software Programmable AC Coupling SupportsACCoupling Software Programmable DC Coupling SupportsDCCoupling Software Programmable External Excitation Current Source SupportsExternalExcitationCurrentSrc Software Programmable Internal Excitation Current Source SupportsInternalExcitationCurrentSrc...

  • Page 125: Start Triggers

    Supported Device Driver Capabilities Start Triggers Table 18: Start Trigger Options DT9838 DOUT TACH QUAD Software Trigger Support SupportsSoftwareTrigger External Positive TTL Trigger Support SupportsPosExternalTTLTrigger External Negative TTL Trigger Support SupportsNegExternalTTLTrigger External Positive TTL Trigger Support for Single-Value Operations SupportsSvPosExternalTTLTrigger...

  • Page 126: Clocks

    Chapter 6 Clocks Table 20: Clock Options DT9838 DOUT TACH QUAD Internal Clock Support SupportsInternalClock External Clock Support SupportsExternalClock Simultaneous Input/Output on a Single Clock Signal SupportsSimultaneousClocking Base Clock Frequency BaseClockFrequency 27487790 12 MHz Maximum Clock Divider MaxExtClockDivider Minimum Clock Divider...

  • Page 127: Counter/Timers

    Supported Device Driver Capabilities Counter/Timers Table 21: Counter/Timer Options DT9838 DOUT TACH QUAD Cascading Support SupportsCascading Event Count Mode Support SupportsCount Generate Rate Mode Support SupportsRateGenerate One-Shot Mode Support SupportsOneShot Repetitive One-Shot Mode Support SupportsOneShotRepeat Up/Down Counting Mode Support SupportsUpDown...

  • Page 128: Tachometers

    Chapter 6 Tachometers Table 22: Tachometer Options DT9838 DOUT TACH QUAD Tachometer Falling Edges SupportsFallingEdge Tachometer Rising Edges SupportsRisingEdge Tachometer Stale Data Flag SupportsStaleDataFlag...

  • Page 129: Chapter 7: Troubleshooting

    Troubleshooting General Checklist ............Technical Support .

  • Page 130: General Checklist

    7. Search the DT Knowledgebase in the Support section of the Data Translation web site (at www.datatranslation.com) for an answer to your problem. 8. Visit the product’s page on the Data Translation web site for the latest tips, white papers, product documentation, and software fixes.
  • Page 131 Chapter The DT9838 module is out of DT9838 modules are calibrated at the factory. If you want calibration. to readjust the calibration of the analog input or analog output circuitry, refer to...

  • Page 132: Technical Support

    Chapter 7 Technical Support If you have difficulty using a DT9838 module, Data Translation’s Technical Support Department is available to provide technical assistance. To request technical support, go to our web site at http://www.datatranslation.com and click on the Support link.

  • Page 133: If Your Module Needs Factory Service

    Troubleshooting If Your Module Needs Factory Service If your module must be returned to Data Translation, do the following: 1. Record the module’s serial number, and then contact the Customer Service Department at (508) 481-3700, ext. 1323 (if you are in the USA) and obtain a Return Material Authorization (RMA).
  • Page 134 Chapter 7...

  • Page 135: Chapter 8: Calibration

    Calibration Using the Calibration Utility ..........Calibrating the Analog Input Subsystem .

  • Page 136: Using The Calibration Utility

    Chapter 8 Using the Calibration Utility The DT9838 module is calibrated at the factory and should not require calibration for initial use. We recommend that you check and, if necessary, readjust the calibration of the DT9838 module every six months using the DT9838 Calibration Utility.

  • Page 137: Calibrating The Analog Input Subsystem

    Calibration Calibrating the Analog Input Subsystem This section describes how to use the DT9838 Calibration Utility to calibrate the analog input subsystem of a DT9838 module. You must calibrate each analog input channel separately. IMPORTANT: Before calibrating the analog input subsystem, ensure that you have attached all of your sensors and configured the sampling frequency of the device.

  • Page 138: Using The Manual Calibration Procedure

    1. Select the analog input channel that you want to calibrate. 2. Enter the sampling frequency at which you want to run (and calibrate) the DT9838 module. 3. Adjust the offset as follows: a.

  • Page 139: Calibrating The Internal Analog Output Circuity (Excitation Voltage)

    This section describes how to use the DT9838 Calibration Utility to calibrate the internal analog output circuitry that is used to generate the excitation voltage for the DT9838 module. This procedure assumes that you have connected a STP STRAIN General-Purpose Accessory, STP STRAIN 120 Quarter-Bridge Completion Accessory, or STP STRAIN 350 Quarter-Bridge Completion Accessory to the DT9838 module.
  • Page 140 Chapter 8...

  • Page 141: Appendix A: Specifications

    Specifications Analog Input Specifications ........... Bridge Specifications .

  • Page 142: Analog Input Specifications

    Appendix A Analog Input Specifications Table 24 lists the specifications for the A/D subsystem on the DT9838 module. Performance ° ° specifications are typical for the operating range of 0 C to 55 Table 24: A/D Subsystem Specifications Feature DT9838 Specifications...

  • Page 143: Bridge Specifications

    Specifications Bridge Specifications Table 25 lists the bridge specifications for the DT9838 module. Table 25: Bridge Excitation Specifications Feature DT9838 Specifications Supported bridge configurations Full, Half, and Quarter (Quarter-Bridge requires external bridge completion resistor) Ω Internal Half-Bridge completion 10 k divider, 0.05% matching, 2 ppm/°C tracking...

  • Page 144: Tachometer Input Specifications

    Appendix A Tachometer Input Specifications Table 26 lists the specifications for the tachometer input on the DT9838 module. Table 26: Tachometer Input Specifications Feature DT9838 Specifications Number of channels Resolution 31 bits per channel Input voltage range ±30 V Threshold voltage ±2 V with 0.5 V hysteresis...

  • Page 145: Trigger Specifications

    Specifications Trigger Specifications Table 27 lists the specifications for the trigger on the DT9838 module. Table 27: Trigger Specifications Feature DT9838 Specifications Trigger sources Internal software trigger: Software-initiated External digital trigger: Software-selectable Analog threshold trigger: Software-selectable External digital trigger Input type:...

  • Page 146: Power, Physical, And Environmental Specifications

    Appendix A Power, Physical, and Environmental Specifications Table 28 lists the power, physical, and environmental specifications for the DT9838 module. Table 28: Power, Physical, and Environmental Specifications Feature DT9838 Specifications USB Power +5 V Standby: 50 mA typical +5 V Operation with no Bridges Powered:...

  • Page 147: Regulatory Specifications

    Specifications Regulatory Specifications Table 29 lists the regulatory specifications for the DT9838 module. Table 29: Regulatory Specifications Feature Specifications Emissions (EMI) FCC Part 15, Class A EN55011:2007 (Based on CISPR-11, 2003/A2, 2006) Immunity EN61326-1:2006 Electrical Equipment for Measurement, Control, and Laboratory Use...

  • Page 148: Connector Specifications

    Appendix A Connector Specifications Table 30 lists the cable and connector specifications for the DT9838 module. Table 30: DT9838 Cable and Connector Specifications Feature DT9838 Specifications Analog input connectors (RJ50) Tyco 5558067-1 Tachometer/external trigger connector Header: Phoenix Contact 1803293 (4-position Screw terminal block)

  • Page 149: External Power Supply Specifications

    Specifications External Power Supply Specifications Table 31 lists the specifications for the optional EP394 +5 V external power supply that can be used with the DT9838 module. Table 31: External Power Supply (EP394) Specifications Feature Specifications Type FRIWO medical power supply (GPP 10) Input voltage 100 to 240 V AC (±10%)
  • Page 150 Appendix A...

  • Page 151: Appendix B: Connector Pin Assignments

    Connector Pin Assignments Analog Input Connectors ........... . . Sync Bus Connector .

  • Page 152: Analog Input Connectors

    Analog Input Connectors Figure 57 shows the orientation of the pins used in each of the analog input (RJ50) connectors on the DT9838 module. 1 2 3 4 5 6 7 8 Figure 57: Analog Input (RJ50) Connector Table 32 lists the pin assignments of the analog input (RJ50) connectors.

  • Page 153: Sync Bus Connector

    Sync Bus Connector Figure 58 shows the orientation of the pins used in the Sync Bus (RJ45) connector (connector J7) on the DT9838 module. 1 2 3 4 5 6 7 8 Figure 58: Sync Bus (RJ45) Connector Table 33 lists the pin assignments of the Sync Bus (RJ45) connector.

  • Page 154: External Trigger And Tachometer Connector

    External Trigger and Tachometer Connector Figure 59 shows the orientation of the screw terminals used in the External Trigger and Tachometer connector (connector J6) on the DT9838 module. (On End Near Power Supply Connector) (On End Near Sync Bus Connector)

  • Page 155: External Usb Connector

    Connector Pin Assignments External USB Connector Figure 60 shows the orientation of the pins used in the external USB connector (connector J8) on the DT9838 module. Figure 60: External USB Connector Table 35 lists the pin assignments of the USB connector.

  • Page 156: External Power Connector

    Pin 1 Pin 2 Figure 61: Layout of the External Power Connector Table 36 lists the pin assignments for the external power connector on the DT9838 module. Table 36: Pin Assignments for the External Power Connector Connector Pin Number Signal Description...

  • Page 157: Screw Terminals On The Stp Strain, Stp Strain 120, And Stp Strain 350

    The screw terminal assignments of the STP STRAIN, STP STRAIN 120, and STP STRAIN 350 accessories, listed in Table 37, match the pin designations of the RJ50 analog input connectors on the DT9838. Table 37: Pin Assignments for the RJ50 Connectors Signal Description RSHUNT+ AIN+ AIN–...
  • Page 158 Appendix B...

  • Page 159: Index

    Index Index bridge configurations Full-Bridge Axial Poisson A/D sample clock Full-Bridge Axial Poisson configuration A/D subsystem, specifications Full-Bridge Bending accessories Full-Bridge Bending configuration EP394 external power supply Full-Bridge Bending Poisson STP STRAIN 120 quarter-bridge completion Full-Bridge Bending Poisson configuration Half-Bridge Bending STP STRAIN 350 quarter-bridge completion Half-Bridge Bending configuration Half-Bridge Poisson...
  • Page 160 Index connecting to the host computer external +5 V connector connectors external clock analog input external clock divider external +5 V maximum external trigger minimum external USB external negative digital trigger STP STRAIN 120 accessory external positive digital trigger STP STRAIN 350 accessory external trigger connector STP STRAIN accessory external trigger input, wiring...
  • Page 161 Index internal excitation voltage offset nulling Open Layers Control panel Open Layers Control Panel applet J5 connector operation modes continuous analog input (scan mode) single-value analog input LabVIEW lead wire correction LEDs physical specifications Trigger pin assignments analog input connector legacy CPL elevated external trigger and tachometer connector load cells...
  • Page 162 Index Quarter-Bridge Temp Comp configuration stopping an operation resolution STP STRAIN 120 quarter-bridge completion analog input accessory available connector number of STP STRAIN 350 quarter-bridge completion retrigger clock frequency accessory returning modules to the factory connector RJ45 connector STP STRAIN general-purpose accessory pin assignments connector RJ50 cables...
  • Page 163 Index synchronizing tachometer and analog input data USB LED system requirements Visual Basic for .NET programs Visual C# programs tachometer voltage ranges falling edges number of rising edges Stale data flag tachometer connector wiring tachometer input external trigger input specifications Full-Bridge Axial Poisson configuration wiring Full-Bridge Bending configuration...
  • Page 164 Index...

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