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July 2025
SCXI-1521B
SCXI-1521B, 24 Input Channels, 120 Ohm Completion Resistors, Strain/Bridge Input Module
Actual item may vary if no part number is provided on quote request.
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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
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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-1521B Strain/Bridge Input Module
The NI SCXI-1521B (Part Number: 777966-21B) module is well-suited for applications with a large quantity of channels, including static and fatigue structural tests with 120 Ω quarter-bridge strain gauges. Every channel has a fixed-gain amplifier and fixed 2-pole Butterworth filter for exact measurements. There is additionally an individual 0-5 V programmable excitation source for every channel. The software types which can be used with this module are the NI-DAQmx 7.3 or later and either LabVIEW or LabWindows/CVI.
The SCXI-1317 Front-Mounting Terminal Block with screw terminals is necessary to operate the SCXI 1521B module. Other accessories that can be used with the SCXI-1521B are the SCXI-1310 Connector and Shell Assembly and the TBX-96 DIN-rail Mounted Terminal Block. The SCXI-1310 offers 96 eyelet terminals for simple hook-and-solder signal linking, as well as custom mass termination linking. The TBX-96 has 96 standard screw terminals and requires a cable to be linked to the Strain/Bridge Input Module. The SH96-96 shielded 1 m cable or the R96-96 1 m unshielded cable will suffice.
The front signal connector on the NI SCXI-1521B is a distinct 96-pin DIN C male connector. This connector is the one used for all signal connections. When referencing the pin-out for this module, the pins branded RSVD are reserved. The user cannot make connections to the RSVD pins under any circumstances. Other labels for the pins include EX + X which links to the sensor excitation, QTR X which links to the quarter-bridge completion resistor, and AI X which links to the amplifier terminal. X refers to the channel number.
SCXI-1521B Obsolete Status has been announced by National Instruments, but the module will still be available for purchase and repairs by Apex Waves.
| Model | SCXI-1521B |
|---|---|
| Manufacturer | National Instruments |
| Part Number | 777966-21B |
| Type | Strain/Bridge Input Module |
| Channels | 24 |
| Voltage Gain | 42 |
| Overvoltage Protection | ±11 V powered on and off |
| Dimensions | 7.4 x 6.8 x 1.2 in. |
| Weight | 26.4 oz. |
| SCXI-1521B Manual | User Manual and Maintenance Manual Available for Download |
| Price | Contact a sales representative for a quote. |
Associated part numbers for SCXI-1521B:
National Instruments SCXI-1521B Frequently Asked Questions
Question: Can you remove bridge offset voltage from the SCXI-1521B if needed?
Answer: Yes, each input channel of the includes a circuit to remove bridge offset voltage.
Question: Is a stable shunt calibration resistor included in the SCXI-1521B?
Answer: Yes, each input channel of the Input Module includes a stable shunt calibration resistor.
Question: How do you enable the shunt calibration resistors on the NI SCXI-1521B?
Answer: You can enable or disable the shunt resistors through software commands.
Question: Where can I find more information about the SCXI-1521B?
Answer: The official NI User manual for the module can be found for free download under the "Manuals & PDFs" tab.
SCXI-1521B PDF Manuals
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