The NI SCXI-1581 supplies 32 channels of fixed 100 µA current excitation for resistance measurements, including RTD applications.
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Key product information and technical features.
The SCXI-1581 provides current excitation rather than sensor signal acquisition. NI identifies the SCXI-1102 as a common companion for high-channel-count RTD measurement systems.
Verified product specifications.
| Excitation channels | 32 single-ended outputs |
|---|---|
| Current output | 100 µA |
| Accuracy | ±0.05 % |
| Temperature drift | ±5 ppm/°C |
| Output voltage compliance | 10 V |
| Maximum resistive load | 100 kΩ |
| Recommended warm-up time | 10 min |
| Operating temperature | 0 to 50 °C |
| Specification reference conditions | Typical at 25 °C unless otherwise noted |
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Module platform
Current excitation
SCXI-1102 for RTD signal measurement
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Product-specific answers based on available technical information.
No. The SCXI-1581 provides fixed 100 µA current excitation.
It supplies excitation. A separate measurement device acquires the sensor signal; NI documents the SCXI-1102 as a common pairing.
SCXI-1300, SCXI-1310, BNC-2095, and TBX-96. The SCXI-1300 onboard temperature sensor cannot be measured when connected to this module.