Table of Contents
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NI 9205/9206 Calibration
Procedure
Contents
This document contains information about calibrating National
Instruments 9205/9206 modules using NI-DAQmx. This calibration
procedure is intended for metrology labs.
This document does not discuss programming techniques or compiler
configuration. The NI-DAQmx driver contains online help files that have
compiler-specific instructions and detailed function explanations. You can
install these help files when you install NI-DAQmx on the calibration
computer.
The NI 9205 and NI 9206 should be calibrated at a regular interval as
defined by the measurement accuracy requirements of your application.
National Instruments recommends that you routinely perform a complete
calibration at least once every two years. You can shorten this interval based
on the accuracy demands of your application or requirements of your
processes. Self-calibration can be performed as needed or when the
temperature varies by 5 °C or more from the last external calibration.
Conventions ............................................................................................ 2
Calibration Options ................................................................................. 3
Self-Calibration................................................................................ 3
External Calibration ......................................................................... 3
Software and Documentation Requirements........................................... 3
Software ........................................................................................... 3
Documentation................................................................................. 4
Calibration Requirements ....................................................................... 5
Password .......................................................................................... 5
Test Equipment ................................................................................ 5
Test Conditions ................................................................................ 5
Calibration Process ................................................................................. 5
Calibration Process Overview ......................................................... 5
Initial Setup...................................................................................... 6
Self-Calibration................................................................................ 6
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Related Manuals for National Instruments 9205
Summary of Contents for National Instruments 9205
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Page 1: Table Of Contents
NI-DAQmx on the calibration computer. The NI 9205 and NI 9206 should be calibrated at a regular interval as defined by the measurement accuracy requirements of your application. National Instruments recommends that you routinely perform a complete calibration at least once every two years. -
Page 2: Conventions
This font is also used for the proper names of disk drives, paths, directories, programs, subprograms, subroutines, device names, functions, operations, variables, filenames, and extensions. NI 9205/9206 NI 9205/9206 refers to the NI 9205 and NI 9206. NI 9205/9206 Calibration Procedure ni.com... -
Page 3: Calibration Options
Calibration Options The NI 9205/9206 support two types of calibration: self-calibration and external calibration. Self-Calibration Self-calibration, also known as internal calibration, uses a software command and requires no external connections. Self-calibration improves measurement accuracy by compensating for variables such as temperature that might have changed since the last external calibration. -
Page 4: Documentation
NI Web site at ni.com/manuals • NI 9205 Operating Instructions/NI 9206 Operating Instructions— These documents contain information about specific device features. The limits you use to verify the accuracy of the devices are based on the specifications found in this document. You can download the latest versions of these documents from the NI Web site at ni.com/... -
Page 5: Calibration Requirements
Calibration Requirements Password The default password for password-protected operations is Test Equipment National Instruments recommends that you use the following equipment for calibrating the NI 9205/9206: • Fluke 5700A calibrator. If that instrument is unavailable, use a high-precision voltage source with an accuracy of at least 10 ppm. -
Page 6: Initial Setup
When you self-calibrate a device, no external signal connections are necessary. NI-DAQmx Function Call LabVIEW Block Diagram Call with the DAQmxSelfCal following parameters: deviceName: dev1 NI 9205/9206 Calibration Procedure ni.com... -
Page 7: Verification Procedure
Throughout the verification process, use Table 4 to determine if the device is operating within its specified range prior to calibration. Because the NI 9205/9206 has many different ranges, you must verify measurements for each available range on these modules. - Page 8 Configure the timing properties for the voltage acquisition using (DAQmx Timing VI), as shown in the DAQmxCfgSampClkTiming following table. NI-DAQmx Function Call LabVIEW Block Diagram Call DAQmxCfgSampClkTiming with the following parameters: taskHandle: taskHandle source: NULL rate: 100000.0 activeEdge: DAQmx_Val_Rising sampleMode: DAQmx_Val_FiniteSamps sampsPerChan: 10000 NI 9205/9206 Calibration Procedure ni.com...
- Page 9 10. Repeat steps 3 through 9 for all ranges and all values. 11. Disconnect the calibrator from the device or proceed to the Adjustment Procedure section to adjust the analog input calibration constants. © National Instruments Corporation NI 9205/9206 Calibration Procedure...
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Page 10: Adjustment Procedure
Complete the following steps to adjust the device with a calibrator: Refer to Table 1 for a list of the NI connection accessories for the NI 9205/9206 and instructions on connecting the calibrator to the device. Set the calibrator to output 4.0 V. - Page 11 Disconnect the calibrator from the device. The device is now calibrated with respect to the external source. After calibrating the device, verify the analog input operation by repeating the Verification Procedure section. © National Instruments Corporation NI 9205/9206 Calibration Procedure...
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Page 12: Ai Absolute Accuracy Tables And Formulas
Table 3. Accuracy Details Residual Residual Gain Offset Offset Error Gain Error Tempco INL Error Nominal (ppm of Tempco Reference (ppm of (ppm of (ppm of Range (V) Reading) (ppm/°C) Tempco Range) Range/°C) Range) ±10 ±5 ±1 ±0.2 NI 9205/9206 Calibration Procedure ni.com... -
Page 13: Device Test Limits
INL_Error = 2 · ADC_Dithered_INL RandomNoise = RandomNoise μVrms Device Test Limits Table 4 lists the specifications that the NI 9205/9206 meets if it has been two years between calibrations. Using the Table The following definitions describe how to use the information from Table 4. -
Page 14: Test Point
That is, when the device is within its 2-year calibration interval, the test point value should fall between these upper and lower limit values. Table 4. NI 9205/9206 Analog Input Values Range (V) Test Point 2-Year Limits... -
Page 15: Where To Go For Support
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.
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