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July 2025
SCXI-1321
SCXI-1321, 18 Screw Terminals, Offset-Null and Shunt Calibration Terminal Block
Actual item may vary if no part number is provided on quote request.
✔ 2 Year Warranty Included
✔ Free Domestic Ground Shipping
✔ NIST Calibration Available
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
Carol Zimme**** Verified Buyer
" Very responsive and helpful, competitive pricing. Good source! "
July 2025
Andrew Gar**** Verified Buyer
" Amazing to work with and had my order within 1 week after purchasing with all NI certs and data that were needed. "
March 2025
Said Sai**** Verified Buyer
" Competent contact for highly specialized components. The support team is very knowledgeable. Many thanks for the help and the fast shipping! "
January 2025
Bob C**** Verified Buyer
" Jason was able to get our emergency situation taken care of quickly and professionally. "
May 2025
Gregg Flecki**** Verified Buyer
" Great service and great products. This is my 2nd time using Apex Waves, truly impressed. "
January 2025
National Instruments SCXI-1321 Offset-Null and Shunt Calibration Terminal Block
The NI SCXI-1321 (Part Number: 777687-21) is ideal for applications with strain gauges, RTDs, or thermistors. This model is well-suited for temperature or voltage applications with a high quantity of channels. This High-Voltage Terminal Block is shielded to allow swift, reliable signal connections. The SCXI-1321 brings nulling and shunt calibration to SCXI-1121 strain gauge applications but can only be used with the SCXI-1121 module revision C or later. There are 18 screw terminals on the NI SCXI-1321.
There is also a front-panel trimming potentiometer, which enables the user to manually null out the offset voltage or bridge transducers. Every channel has shunt calibration circuits that can be controlled as a group via software. The user can also trigger a switch on the SCXI 1321 Terminal Block to link a 301 k Ohm shunt resistor in parallel with the strain gauge. The nulling and shunt resistor on the Terminal Block are socketed, so they can be customized by the user with ease. The device has a maximum field wire gauge of 26-16 AWG, a cold junction sensor output and accuracy of ±10 mV/ËšC and 1.3 °C respectively. It has a maximum working voltage of 300 V (CAT II).
Offset nulling is a hardware nulling process with Wheatstone-bridge transducers that have an initial offset error. Fixing this error will increase measurement preciseness. The nulling circuitry on the SCXI-1321 will work with quarter-bridge, half-bridge, and full-bridge strain-gauge arrangements. Every channel has separate nulling circuitry, as well as a designated trimming potentiometer. For example, Channel 0 corresponds to Potentiometer R1. Channel 1 corresponds to Potentiometer R2. Next, Channel 2 corresponds to Potentiometer R14. Finally, Channel 3 corresponds to Potentiometer R15.
It has a recommended operating temperature range of 0 to 50 °C, a storage temperature range of –20 to 70 °C, and a non-condensing relative humidity range of 10 to 90%. The NI device is designed to comply with the following electrical safety standards: IEC 61010-1, EN 61010-1, UL 3111-1, UL61010B-1, and CAN/CSA C22.2 No. 1010.1.
SCXI-1321 Obsolete Status has been announced by National Instruments, but the Terminal Block will still be available for purchase and repairs by Apex Waves.
| Model | SCXI-1321 |
|---|---|
| Part Number | 777687-21 |
| Manufacturer | National Instruments |
| Type | Offset-Null and Shunt Calibration Terminal Block |
| For use with: | SCXI-1121 |
| Sensor Output | ±10 mV/ËšC |
| Maximum Field Wire Gauge | 26-16 AWG |
| Acuracy | 1.3 °C |
| SCXI-1321 Manual | User Manual and Maintenance Manual Available for Download |
| Price | Contact a sales representative for a quote. |
Associated part numbers for SCXI-1321:
National Instruments SCXI-1321 Frequently Asked Questions
Question: What module can the NI SCXI-1321 be used with?
Answer: The NI SCXI-1321 terminal block can only be used with the SCXI-1121 revision C or later modules.
Question: Does the SCXI 1321 have a socketed shunt resistor?
Answer: Yes, the SCXI 1321 has a socketed shunt resistor for strain-gauge shunt calibration.
Question: Does the National Instruments SCXI-1321 work with the Wheatstone bridge transducers?
Answer: The National Instruments SCXI-1321 was designed to work with the Wheatstone bridge transducers.
Question: Can the SCXI-1321 accommodate thermocouples?
Answer: The SCXI-1321 can easily accommodate thermocouples, RTDs, thermistors, millivolt sources, and current-loop receivers.
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Eligible returns may be accepted within 30 days at Apex Waves’ discretion. A 25% restocking fee applies; non-refundable and built-to-order products are excluded.
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