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What data would you acquire with this?

OwainM

We're appraising the NI USB-6421 for a RoadTest and would appreciate some member input.
image

It's USB Type-C powered and has analogue and digital IO and 4 counters, analogue input channels with four input range settings between ± 200 mV to ± 10 V. The analogue output channels have an update rate of 250 kS/s/ch at up to ± 10 V.

It's compatible with some free data acquisition software from NI, but also has some professional software to use with it that's also available.

The full product specifications are available below:



Thanks for reading and commenting below

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  • I didn't vote - none of the suggestions fit.

    This kind of box might be useful for multichannel applications but has several limitations that some people seem to have missed.

    There is no specification for round trip latency - ie the time taken to measure an input and adjust an output  - because of buffering and the USB interface it will be slow and jittery - so applications like DAB's acoustic levitation experiment won't work.

    It's slow (as   has pointed out) - very slow, the 250kHz sampling rate is only true if you just use 1 channel, for 16 channels its 15.6kHz.

    There is no input filtering - and the input bandwidth is approx 500kHz  - so you will have noise problems.

    So the extra bits had better include some way of doing filtering.

    Looking back over many years of measuring stuff I can see it being useful in component testing where you might want to test several parts at once and over a long time and will need to build a decent test jig anyway. When I've done this I've mostly used a DMM or a DMM with multiplexing built in or a scope for faster stuff. 

    MK

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  • I didn't vote - none of the suggestions fit.

    This kind of box might be useful for multichannel applications but has several limitations that some people seem to have missed.

    There is no specification for round trip latency - ie the time taken to measure an input and adjust an output  - because of buffering and the USB interface it will be slow and jittery - so applications like DAB's acoustic levitation experiment won't work.

    It's slow (as   has pointed out) - very slow, the 250kHz sampling rate is only true if you just use 1 channel, for 16 channels its 15.6kHz.

    There is no input filtering - and the input bandwidth is approx 500kHz  - so you will have noise problems.

    So the extra bits had better include some way of doing filtering.

    Looking back over many years of measuring stuff I can see it being useful in component testing where you might want to test several parts at once and over a long time and will need to build a decent test jig anyway. When I've done this I've mostly used a DMM or a DMM with multiplexing built in or a scope for faster stuff. 

    MK

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