The National Instruments SCXI-1140 is an eight-channel differential amplifier module for SCXI systems, providing simultaneous input sampling and connections for external sample-and-hold timing.
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The SCXI-1140 adds simultaneous sample-and-hold signal conditioning to an SCXI measurement system. NI describes this sampling method as capturing channel values at the same instant, then multiplexing those values for analog-to-digital conversion.
NI documents cascaded configurations with SCXI-1120 or SCXI-1120D isolation amplifiers for simultaneous isolated measurements. Correct module order, cabling, driver support, and DAQ selection are configuration-dependent.
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| Input channel count | 8 channels |
|---|---|
| Input configuration | Differential — |
| Sampling method | Simultaneous sample-and-hold — |
| Maximum overvoltage protection, powered on | ±30 V |
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Signal-conditioning platform
Simultaneous-sampling differential amplifier
NI's multichassis configuration guide gives simultaneous-sampling modules, including the SCXI-1140, priority when selecting the cabled module.
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Not necessarily. NI lists the SCXI-1140 under simultaneous sampling: sample-and-hold circuitry captures channel values together, after which the values are multiplexed and sent to an ADC.
No. The cited NI overview identifies ±30 V as maximum overvoltage protection while powered on, not as the measurement range.
NI documents SCXI-1120/D first-stage modules followed by an SCXI-1140 for simultaneous isolation with M-series or E-series DAQ devices. Follow the documented cabling and driver requirements.