Error -200077 occurred at DAQmx Control

[AT12]

Hi,

I'm having a problem with sampling below a rate of 1k with the NI USB-4431.

Possible reason(s):

Requested value is not a supported value for this property. The property value may be invalid because it conflicts with another property.

Property: SampClk.Rate
Requested Value:  100.000000
Valid Values Begin with:  1.0e3
Valid Values End with:  102.400000e3

Attached is my vi.

I've tried changing the wait but it makes no difference.

I'd really appreciate some help on this one please.

Thanks in advance,

AT12.

[Freelance_LV]

Unable to open your vi. Can you post it in a lower version?

Also, what is the sample rate you tried? I assume you are using DAQmx timing function, or the DAQ Assistant.

As mentioned in the error message, the device accepts sample rates between 1K and 102.4K samples/sec.

Try with samples rates above 1k and things should work fine.

[AT12]

Hi,

Thanks for replying.

It does work fine higher than 1k but it is supposed to measure lower than this:

Four channels on the USB-4431 are TEDSanalog input channels that can sample from 1 S/s up to a full rate of 102.4 kS/s.

I need to measure at <1k S/s. I am using the DAAQ assistant.

I've Saved for Previous Version: 2009 - attached.

Thanks,

AT12

[Freelance_LV · Accepted solution]

Hi

http://www.ni.com/pdf/products/us/cat_usb4431.pdf

As per the specificaitons in the above document, the sampling rate is from 1kS/s to 102.4kS/s

[AT12]

Oh right! I got my information from the overview here:

https://www.ni.com/en-us/shop/model/usb-4431.html