Advertisement
Quick Links
INSTALLATION GUIDE
BNC/TC-2095 Rack-Mount Adapter
This installation guide describes how to install the National Instruments
BNC-2095 and the TC-2095 rack-mount adapters and use them with
SCXI-1100, SCXI-1102/B/C, and SCXI-1104/C modules. The BNC-2095
also can be used with the SCXI-1581.
The BNC-2095 adapter has 32 BNC connectors to connect field signals to
the SCXI module inputs. The TC-2095 adapter has 32 uncompensated
miniconnectors to connect the thermocouples to the SCXI module inputs.
Both the BNC-2095 and TC-2095 adapters have the following features:
•
A 96-pin connector to connect to the SCXI module using an SH96-96
shielded cable or an R9696 ribbon cable
•
Rack-mount construction for use with 19-in. racks
•
A shielded, metal enclosure to minimize noise
The TC-2095 also features isothermal construction to minimize the
temperature gradients across the thermocouple junctions and a
high-accuracy thermistor for cold-junction temperature sensing.
The BNC-2095 and the TC-2095 have pull-up resistors connected between
CH+ and +5 VDC and ground-referencing resistors connected between
CH– and chassis ground through switches located on the rear of the adapter.
The bias resistor is a ground-referencing pull-down resistor for referencing
floating signals; the pull-up resistor is used for open thermocouple
detection. The pull-up resistors enable open thermocouple detection by
detecting saturation in the SCXI module amplifier output and
ground-referenced floating signals.
Advertisement
Related Manuals for National Instruments TC-2095
Summary of Contents for National Instruments TC-2095
- Page 1 INSTALLATION GUIDE BNC/TC-2095 Rack-Mount Adapter This installation guide describes how to install the National Instruments BNC-2095 and the TC-2095 rack-mount adapters and use them with SCXI-1100, SCXI-1102/B/C, and SCXI-1104/C modules. The BNC-2095 also can be used with the SCXI-1581. The BNC-2095 adapter has 32 BNC connectors to connect field signals to the SCXI module inputs.
- Page 2 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, and code excerpts. BNC/TC-2095 Rack-Mount Adapter Installation Guide ni.com...
-
Page 3: What You Need To Get Started
What You Need To Get Started To install and use the BNC/TC-2095, you need the following items: ❑ One of the following: – BNC-2095 rack-mount adapter with BNC connectors – TC-2095 rack-mount adapter with thermocouple miniconnectors ❑ BNC/TC-2095 Rack-Mount Adapter Installation Guide ❑... - Page 4 Do not force the miniconnector into the socket. If you have difficulty inserting the miniconnector, check that the polarity is correct. Connect the thermocouple wire to the TC-2095 by inserting the miniconnector into the socket. Each miniconnector consists of two spades of different widths.
- Page 5 Configuring Open-Thermocouple/Signal Detection and Signal Ground-Referencing Refer to Table 1 to configure the BNC/TC-2095 for operating with open-thermocouple or signal detection, and for properly ground-referencing the signals. Table 1. Configuring Open-Thermocouple/Signal Detection and Signal Ground-Referencing Detects Open Switch Settings Signal Type...
- Page 6 Caution in place can cause permanent damage to the resistor network and the traces on the BNC/TC-2095 printed circuit board. NI is not liable for any damage or injuries resulting from improper signal connections. Refer to the Temperature Sensor Output and Accuracy section for more information.
- Page 7 4 SCXI Chassis Figure 1. Connecting the SH96-96 Cable to the SCXI Module Mount the BNC/TC-2095 onto a 19-in. rack or place it on a workbench near the SCXI chassis. If you do not rack-mount the BNC/TC-2095, attach the four adhesive rubber feet included in the kit to the bottom of the adapter to keep it stationary.
- Page 8 Note isothermal properties for accurate cold-junction compensation, keep the adapter from extreme temperature differentials. Connect the other end of the 96-pin cable to the BNC/TC-2095 96-pin connector and screw down the backshell. Caution The cable connectors of the cables are keyed. Do not force the connection. If you encounter difficulty, verify that the keying of the cable connectors is correct.
- Page 9 Jumper W2 connects the metal case and shield to the analog ground of the SCXI module directly or through a 100 Ω resistor. The factory-default setting is through the 100 Ω resistor. Refer to Table 2 for configuration options for jumper W2. © National Instruments Corporation BNC/TC-2095 Rack-Mount Adapter Installation Guide...
- Page 10 Table 2. BNC/TC-2095 Shield Ground Jumper Configuration Jumper W2 Configuration Description When to Use a Setting 100 Ω (factory-default)— Use this setting when you are using Connects the the SH96-96 cable, and if one of the 0 Ω BNC/TC-2095 housing following is true: 100 Ω...
- Page 11 Configuring the Cold-Junction Sensor (TC-2095 Only) The TC-2095 jumper W1 is set by factory-default to multiplexed temperature sensor (MTEMP) mode. This setting multiplexes the cold-junction sensor for SCXI modules operating in multiplexed mode. Refer to Figure 3 for the location of jumper W1.
- Page 12 Convert the temperature to Celsius and Fahrenheit. T °C 273.15 – = temperature in Kelvin T °C T °F ---------------------- - where T(°F) and T(°C) are the temperature readings in degrees Fahrenheit and Celsius, respectively. BNC/TC-2095 Rack-Mount Adapter Installation Guide ni.com...
- Page 13 Configuring the Resistor Networks When using an SCXI-1102/B/C, you can use the package of 10 MΩ resistor networks included in the BNC/TC-2095 kit. You can install these resistor networks as RP1, RP2, RP3, and RP4. Refer to Figure 3 for the locations of RP<1...8>.
- Page 14 SCXI-1102/B/C Module You can replace the 10 Ω ground-referencing resistor networks (factory-default configuration) in the BNC/TC-2095 with the 10 MΩ resistor networks supplied in the kit. The 10 MΩ resistor networks allow the signal to be ground-referenced or floating. Channels with open thermocouples saturate at all sample rates.
- Page 15 Figure 6. Resistor Networks Pin 1 Figure 7. Pin 1 Location on BNC/TC-2095 for Ground-Referencing Resistor Socket Each resistor network is labeled with descriptive numbers on the left front side, and pin 1 is located directly beneath the darkened symbol within these numbers.
- Page 16 If the application demands high accuracy, you can eliminate the voltage drop inaccuracy error by turning off the appropriate pull-up resistor network or by calibrating the system offset. For the location of these switches, refer to Figure 3. BNC/TC-2095 Rack-Mount Adapter Installation Guide ni.com...
-
Page 17: Specifications
Includes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature sensor and any screw terminal. The temperature sensor accuracy includes tolerances in all component values, the effect caused by temperature and loading, and self-heating. © National Instruments Corporation BNC/TC-2095 Rack-Mount Adapter Installation Guide... -
Page 18: Electromagnetic Compatibility
Refer to the Declaration of Conformity (DoC) for this product for any additional Note regulatory compliance information. To obtain the DoC for this product, visit , search by model number or product line, and click the ni.com/hardref.nsf appropriate link in the Certification column. BNC/TC-2095 Rack-Mount Adapter Installation Guide ni.com... - Page 19 *321731B-01* Corporation. 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.
Need help?
Do you have a question about the TC-2095 and is the answer not in the manual?
Questions and answers