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776572-21, 4 Channels, Excitation Module Included, SCXI-1121 Isolation Amplifier
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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
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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 776572-21 Universal Input Module for SCXI
Part Number 776572-21 is the identifying part number for the National Instruments SCXI-1121 Universal Input Module. This module is ideal for many sensor and signal inputs that require isolation such as strain gauges, RTDs, thermistors, thermocouples, volt and millivolt sources. The module operates in two modes: the Parallel-Output mode and the Multiplexed-Output mode.
The 776572-21 features four isolated input channels and four isolated excitation channels that are all isolated and independently configured using jumpers. For the analog inputs, the gain can be tuned using jumpers to values of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, or 2,000. Likewise, the output range of the 776572-21 is ±5 V, while the gain accuracy is 0.15% of full scale. Filtering is done by a 3-pole RC-type filter whose cutoff frequency is also jumper selectable taking values of 4 Hz (–10 dB) or 10 kHz (–3 dB). The rise time in the analog input is 0.12 sec at 4 Hz and 70 µsec for 10 KHz while the slew rate is 0.15 V/µsec. The input protection (continuous) is 250 Vrms (maximum) whereas output protection is continuous short-to-ground. Furthermore, the maximum power dissipation of the module is 7.5 W.
The 776572-21 measures 1.2 in. × 6.8 in. × 7.4 in. in physical dimensions and weighs 23.55 oz. A 50-pin male ribbon cable is used as the rear connector whereas a 32-pin DIN C connector is used as front connector, which also features a 18-screw terminal adapter. The recommended temperature range for the operation of the 776572-21 is 0 °C to 50 °C at a relative humidity of up to 10% to 90% RH. On the other hand, it can be stored at -20 to 70 °C. For safety purposes, it is recommended to connect voltages that meet the limit of 250 Vrms, continuous between both channel-to-channel and channel-to-ground. The module meets the following standards of safety for electrical equipment for measurement, control, and laboratory use: IEC 61010-1, EN 61010-1, UL 61010-1, and CSA 61010-1.
| Part Number | 776572-21 |
|---|---|
| Model Name | SCXI-1121 |
| Part Type | Universal Input Module for SCXI |
| Number of Analog Input Channels | 4 |
| Output Range | ±5 V |
| Slew Rate | 0.15 V/µsec |
| Rise Time | 0.12 sec at 4 Hz; 70 µsec at 10 kHz |
| Input Protection (Continuous) | 250 Vrms, maximum |
| Power Dissipation | 7.5 W maximum |
| Gain (Jumper-selectable) | 1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, 2,000 |
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