Signal Conditioning

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Using the DAQ-9178 and 9205 Voltage Module, how do I build a 16 Channel Voltmeter with a range of 0--50Vdc?

I have already built an 8 channel 10:1 voltage divider using 1% resistors.  My problem is there is a lot of AC noise on the DC signal and the voltages don't match my Fluke DVM which is sitting beside.

 

Only Channels one and two have signal going to them.  Ch1, (a0), is connected to a 9volt battery, and ch2, (a1), is connected to a variable bench supply set for 17Vdc.   The remaining channels are currently floating.

 

The DVM is rock steady, however the LabVIEW indicators show what I assume is a product of the AC noise.

 

Any help would be appreciated :smileyhappy:

 

Thanks so much

-Matt

 

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Your AC noise looks like line noise , Your DMM filter these already. So all you have to do is to apply a filter. Capture 300ms (works for 50Hz & 60Hz) and calculate the mean 😉

 

Greetings from Germany
Henrik

LV since v3.1

“ground” is a convenient fantasy

'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'


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