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National Instruments Corporation

TBX-1328 Installation Guide

Figure 6.

Full-Bridge Strain-Gauge Circuit Diagram

5
4
3
2
1

ADDRESS

250 V CAT II MAX CHANNEL-TO-CHANNEL
250 V CAT II MAX CHANNEL-TO-EARTH

HIGH VOLTAGE

+
–

–

FR
ONT

ONT

FR
ONT

CH–

CH+

EX–

EX+

TBX-1328

SCXI-1121

Note: Each sensor lead (R

) has an added lead resistance of R

= 0.21

Ω

Содержание TBX-1328

Страница 1: ...nstruments TBX 1328 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 1328 ...

Страница 2: ...connect to the SCXI 1120 D SCXI 1121 SCXI 1125 or SCXI 1126 front connector The TBX 1328 has a high precision thermistor for precise cold junction compensation and isothermal copper planes that minimize the temperature gradients across the screw terminals when you take thermocouple measurements The TBX 1328 mounts on most European standard DIN EN mounting rails The terminal block has 24 screw term...

Страница 3: ... that you must select or click on in the software such as menu items and dialog box options Bold text also denotes parameter names 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 you must supply monospace Text in this font denotes text or characters that you should enter f...

Страница 4: ...r connecting or disconnecting any signal wires To connect the field signals to the TBX 1328 for use with the SCXI 1120 or SCXI 1121 follow the labeling on the TBX 1328 indicated along with the appropriate SCXI module type column as shown in Figure 1 For the SCXI 1120D SCXI 1125 and SCXI 1126 modules use the SCXI 1120 label To connect the signals complete the following steps referring to Figures 1 ...

Страница 5: ...k does not provide strain relief for field signal wires Add strain relief insulation and padding for the wires if necessary 3 Replace the TBX 1328 terminal block cover and tighten the captive cover screws The signal connection is now complete Figure 1 TBX 1328 Terminal Block Parts Locator Diagram 1 Cover Mounting Nut 2 Chassis Ground Screw Terminals 3 Backshell Mounting Kit 4 Cable Connector 5 Ass...

Страница 6: ...XI module while referring to Figures 2 through 4 as needed 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 appropriate SCXI module and secure it by tightening both thumb screws Figure 2 Connecting the SH32 32 A Cable to the SCXI Module 1 M 2 5 Mounting ...

Страница 7: ...ct one end of the cable assembly to the SCXI module front connector and secure the SH32 32 A cable by tightening both backshell mounting screws 6 Connect the other end of the cable assembly to the TBX 1328 terminal block connector and secure the SH32 32 A cable by tightening both backshell mounting screws 7 Reconnect the E Series DAQ device to the SCXI chassis 1 Backshell Mounting Screws and Ears ...

Страница 8: ...mbly refer to the TBX Rack Mount Installation Guide 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 fl...

Страница 9: ...sistor sockets are provided for each channel Field wiring connectors Signal screw terminals 16 screw terminals 8 pairs Functional earth ground 8 screw terminals Terminal spacing 0 5 cm 0 2 in center to center Maximum wire gauge 16 AWG Strain relief none Dimensions of front entrance 1 2 by 7 3 cm 0 47 by 2 87 in 1 This specification includes the accuracy of the temperature sensor circuitry itself a...

Страница 10: ...ion Category II Channel to channel Each channel must remain within 250 Vrms or 250 VDC of the voltage applied to any other channel Installation Category II Environmental Operating temperature 0 to 50 C Storage temperature 20 to 70 C Humidity 10 to 90 RH noncondensing Maximum altitude 2 000 m Pollution Degree indoor use only 2 Safety The TBX 1328 is designed to meet the requirements of the followin...

Страница 11: ...ent Considerations The TBX 1328 provides high accuracy temperature measurements for isolation modules such as the SCXI 1120 D SCXI 1121 and SCXI 1125 The TBX 1328 provides connectivity to thermocouples thermistors and RTDs The TBX 1328 provides high accuracy thermocouple measurements using an onboard cold junction compensation CJC sensor To find out how to read the CJC refer to the documentation f...

Страница 12: ...es the TBX 1328 does not provide open thermocouple detection To provide open thermocouple detection you must provide a resistor to 5 V and another resistor to GND which defeats the isolation boundary and changes the specifications Temperature Sensor Output and Accuracy The TBX 1328 temperature sensor outputs 1 91 to 0 65 V from 0 to 50 C LabVIEW Measurement Studio and NI DAQ can convert a thermist...

Страница 13: ...e the following formulas T C TK 273 15 where TK is the temperature in degrees kelvin a 1 295361 10 3 b 2 343159 10 4 c 1 018703 10 7 RT resistance of the thermistor in ohms VTEMPOUT output voltage of the temperature sensor where T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively Note Use the average of a large number of samples to obtain the most accura...

Страница 14: ...ut this channel address string in the same channel string array as other channels on the same SCXI 1125 module but it must be the first channel scanned on the SCXI 1125 Reading the Temperature Sensor in NI DAQ Refer to the NI DAQ Function Reference Manual for the description for reading the temperature sensor using the SCXI_Single_Chan_Setup SCXI_Change_Chan and SCXI_SCAN_Setup functions Note The ...

Страница 15: ...Figure 6 shows a typical full bridge strain gauge circuit To determine the amount of error introduced by the cable complete the following steps 1 Calculate the total resistance RTL of the cable based on the cable length Note Remember to include the lead resistance of both Vex and Vex 2 Determine the bridge resistance of the strain gauge RSG connected at the TBX 1328 ...

Страница 16: ...Diagram 5 4 3 2 1 ADDRESS 250 V CAT II MAX CHANNEL TO CHANNEL 250 V CAT II MAX CHANNEL TO EARTH C HIGH VOLTAGE FRONT FRONT FRONT FRONT FRONT FRONT FRONT FRONT FRONT FRONT FRONT FRONT R1 R2 R3 R4 CH CH EX EX RL RL RL RL TBX 1328 SCXI 1121 RL Note Each sensor lead RL has an added lead resistance of RL 0 21 Ω m ...

Страница 17: ...are connecting to the TBX 1328 Perform similar calculations for the field wires as you did for the cable Resistance can vary depending on the cable and field wires Add this error amount to the voltage drop across the SH32 32 A cable to get a total voltage drop You can compensate for this error along with any additional cable lead resistance introduced by the strain gauge connection wires One simpl...

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