NI-9237 Analog Input Module

[amp61]

NI-9237 analog input channels.  Test Panel Input voltage range is -25m to +25m volts.

Can this board allow higher voltages, 5 volts?

If wrong hardware for my application, what DAQ board?

If wrong board, then a sensor in mV range for reading pressure.

[Jacobson]

That module is for reading strain transducers so the input is not specified in V but rather V/V. What exactly are you trying to measure?

https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P9yBSAS&l=en-US

[amp61]

Pressure sensor is analog signal 1 to 5 volts.

Customer's older fixture winxp pc, quit working.

Customer ordered NI-9237, so need to find out their sensor type.

If need measure analog input, 0 to 5 volts, what module?

Thanks.

[ZYOng]

Most of the NI DAQ support +/-10V. You can browse the NI shopping page. On the left, check the C Series Voltage Input Module filter. Then you can select one based on your requirements for channel count, budget, sampling rate etc.

[amp61]

Customer is using the bridge type sensor, mv/V.

It is ok to use it, not my preference.

The original project was on Winxp back in 2002.  Project updated to latest version and pc.

Plot was collecting 300 samples of pressure.  It was 2 seconds for 300 sample points.

Using the library example for Bridge - Continuous Input, it takes ~3000 sample reads for ~2 seconds.

It doesn't matter how low my Sample Rate, Actual Sample Rate doesn't go below 1612.90.

How to get slower scan rate? I need only 300 sample points, not 3000.

Timing Settings

Sample Rate

Actual Sample Rate

Samples per loop

I include my copy of vi.

Thanks for any info.

[GerdW · Accepted solution]

Hi amp,

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@amp61 wrote:

Plot was collecting 300 samples of pressure.  It was 2 seconds for 300 sample points.

Using the library example for Bridge - Continuous Input, it takes ~3000 sample reads for ~2 seconds.

It doesn't matter how low my Sample Rate, Actual Sample Rate doesn't go below 1612.90.

How to get slower scan rate? I need only 300 sample points, not 3000.

---

You forgot to mention which kind of DAQ device you used with that old WinXP computer!

Now you are using the NI9237 module - and apparently you also forgot to read its spec sheet!

That modules has limits on the sample rate - for both min and max!

The min sample rate  is ~1.6kS/s (for internal sample clock) as clearly written in the datasheet.

To get less samples per second you can decimate the samples. I recommend to set the sample rate to an integer multiple of your desired rate to simplify the decimation…

[amp61]

Thanks!

The original NI board was AT-MIO-16E-10.

Higher scan rate is ok.