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TBX-1303 32-Channel Isothermal Terminal Block

4

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Installing the TBX-1303

Perform the following steps to mount the SH96-96 cable assembly and
connect the TBX-1303 to the SCXI module. Refer to Figures 1 and 2
as needed.

Caution

Refer to the

Connecting Signals

section before connecting the signals. If signal

wires are connected to the terminal block, dangerous voltages can exist even when the
equipment is powered off.

1.

Power off the SCXI chassis.

2.

Power off the computer that contains the E Series data acquisition
(DAQ) device, or disconnect the device from the SCXI chassis.

3.

Connect the TBX cable adapter to the SCXI module, and secure
the adapter by tightening both thumbscrews.

Figure 1.

Connecting the SH96-96 Cable to the SCXI Module

1

Backshell Mounting Screws

2

SH96-96 Cable

3

Thumbscrews

4

SCXI Chassis

5

TBX Cable Adapter

3

4

3

1

5

1

2

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Содержание TBX-1303

Страница 1: ...nstruments TBX 1303 Manual Get Pricing Availability at ApexWaves com Call Today 1 800 915 6216 Email sales apexwaves com https www apexwaves com test measurement misc national instruments terminal blocks TBX 1303 ...

Страница 2: ...h SCXI 1100 and SCXI 1102 B C modules The TBX 1303 is a DIN rail mountable terminal block that connects through a cable to the SCXI 1100 or SCXI 1102 B C module input connector The TBX 1303 has a high accuracy thermistor cold junction temperature sensor and an isothermal copper plane to minimize the temperature gradients across the screw terminals when you take measurements with thermocouples The ...

Страница 3: ... shipped with the product for precautions to take bold Bold text denotes items that you must select or click in the software such as menu items and dialog box options Bold text also denotes parameter names and hardware labels italic Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that...

Страница 4: ...entation One of the following modules SCXI 1100 module and documentation SCXI 1102 B C module and documentation One of the following cable assemblies SH96 96 R9696 SBS 96F shielded backshell Long nose pliers 3 16 in wrench Number 1 Phillips screwdriver TBX rack mount kit optional TBX rack mount assembly TBX Rack Mount Kit Installation Guide Four 10 32 screws ...

Страница 5: ...onnected to the terminal block dangerous voltages can exist even when the equipment is powered off 1 Power off the SCXI chassis 2 Power off the computer that contains the E Series data acquisition DAQ device or disconnect the device from the SCXI chassis 3 Connect the TBX cable adapter to the SCXI module and secure the adapter by tightening both thumbscrews Figure 1 Connecting the SH96 96 Cable to...

Страница 6: ...nimize the temperature gradient inside the terminal block and to maintain its isothermal properties for accurate cold junction compensation CJC keep the TBX 1303 terminal block away from extreme temperature differentials Figure 2 Connecting the SH96 96 Cable to the TBX 1303 Terminal Block Note The SH96 96 cable is not shown in the exact position for proper connection to the terminal block connecto...

Страница 7: ...hich you can download from ni com manuals for instructions If you are not using this rack mount assembly complete the following steps to mount the TBX assembly directly onto the DIN rail 1 Snap the TBX terminal block onto the DIN rail with a firm push 2 Install the SCXI chassis using the appropriate chassis rack mount kit Note To remove the TBX terminal block from the DIN rail place a flathead scr...

Страница 8: ... shown in Figure 2 Note The GND terminals are connected to the SCXI module chassis ground through the cable not the shield In addition each channel has its own shield terminal labeled S on the board for connecting signal shields The TBX 1303 has corresponding rows labeled A B and C as shown in Figure 4 to help you make the correct connections 3 Verify that you have the resistor networks appropriat...

Страница 9: ... S1 to the MTEMP position This setting is the factory default Refer to Figure 4 for the location of switch S1 Direct temperature sensor DTEMP mode set the TBX 1303 terminal block switch S1 to the DTEMP position This mode connects the temperature sensor to a separate DAQ channel through the SCXI module Refer to the SCXI module user manual to configure the SCXI module for DTEMP mode 1 Cover Mounting...

Страница 10: ...ocumentation for programming information Table 1 Switch S1 Settings Switch S1 Position Description MTEMP mode selected factory setting preferred mode and parking position DTEMP mode selected connects to a separate DAQ channel Table 2 Temperature Sensor Voltage Output Accuracy Temperature Range Voltage Output Accuracy1 0 to 15 C 1 0 C 15 to 35 C 0 65 C 35 to 55 C 1 0 C 1 Includes the combined effec...

Страница 11: ...n the VTEMPOUT signal Therefore use an average of a large number of samples to obtain an accurate measurement For example sample for one second and average Noisy environments require more samples for greater accuracy The SCXI 1102 B C has a 2 Hz filter on the VTEMPOUT signal input channel MTEMP 2 Calculate the cold junction temperature in Kelvin a 1 295361 10 3 b 2 343159 10 4 c 1 018703 10 7 RT r...

Страница 12: ...between CH and 5 V and has a bias resistor connected between CH and chassis ground These resistors help detect open thermocouples by detecting module amplifier output saturation The TBX 1303 ships with 10 Ω and 10 MΩ resistor networks Depending on the SCXI module you use with the TBX 1303 you might need to change from the default 10 Ω configuration to the 10 MΩ configuration Figure 6 shows how the...

Страница 13: ...acement With this configuration thermocouples are either ground referenced or floating Table 3 shows the relationship between the channel input signals and the resistor networks Table 3 Channel Input Signals and Resistor Networks Channel Pull up Resistor Network Bias Resistor Network 0 7 RP1 RP5 8 15 RP2 RP6 16 23 RP3 RP7 24 31 RP4 RP8 CH CH CH CH SCXI Module Rpullup RP1 RP2 RP3 RP4 in sockets Rbi...

Страница 14: ...C Module You can replace the 10 Ω bias resistor networks factory default configuration in the TBX 1303 with the 10 MΩ resistor networks supplied in the kit Using the 10 MΩ resistor networks you can have ground referenced or floating signals The channels with open thermocouples saturate at all sample rates of the module Table 4 Selecting the Appropriate Resistor Networks Module Bias Resistor Pull u...

Страница 15: ...n accurately measure at the maximum sampling rate of the module The open thermocouple channel may not saturate if the interchannel delay is less than 200 µs or if the sample rate is more than 5 kHz at a gain of 100 or higher If you want fast open thermocouple detection and you have short thermocouple leads or if high accuracy is not important you can replace the pull up resistors with a lower valu...

Страница 16: ...liminates the open thermocouple detection feature or use the 10 Ω bias resistor networks which bring the common mode voltage down to nearly 0 VDC Current Leakage The open thermocouple detection circuitry results in a small current leakage into the thermocouple With the 10 MΩ bias and pull up resistor networks the current leakage results in a negligible error With the 10 Ω bias resistor the 10 MΩ p...

Страница 17: ...r 10 MΩ Field wire gauge 26 to 14 AWG Physical Compatible DIN rails DIN EN 50 022 DIN EN 50 035 Terminal block dimensions 19 81 by 7 62 by 11 18 cm 7 8 by 3 by 4 4 in Maximum Working Voltage Maximum working voltage signal common mode Each input should remain within 10 V of chassis ground 1 Includes the combined effects of the temperature sensor accuracy and the temperature difference between the t...

Страница 18: ...lass A Compliant Electrical emissions EN 55011 Class A at 10 meters FCC Part 15A above 1 GHz Electrical immunity Evaluated to EN 61236 1998 Table 1 Note For full EMC compliance you must operate this device with shielded cabling In addition all covers and filler panels must be installed Refer to the DoC for this product for any additional regulatory compliance information To obtain the DoC for this...

Страница 19: ...t find the answers you need contact your local office or NI corporate For telephone support in the United States dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Québec 5...

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