Showing results for 
Search instead for 
Did you mean: 

Sample Rate with DMM-4081 (6,5 DIgits) is very low


In my application I do a AC Volt Measurement with a NI-DMM 4081 to measure values of a ECU between 30 µV and 100 µV.
I use Labview 2015 and latest DMM driver.


I attached 2 Screens of the ac configuration and the measurement VI.

DMM Config:
Range: -1 (Auto)
Digits: 6,5
Min Freq: 500Hz
Max Freq: 2kHz


The Multi Point VI needs at least 6 seconds to acquire 10 Samples. That means a sample rate smaller than 1 S/s.
If I enable AutoZero and ADC it takes 60 seconds for 10 Samples.

Actually the goal is to add a lowpass filter behind the Multi Point VI. With this sample rate it's almost impossible to use a filter VI afterwards
because the filter VIs require a samplerate bigger than the cut-off frequency (500Hz).

I found this page

According to this we can only reach a sample rate of 100 S/s with 6,5 Digits.
And yes I can see that AutoZero and ADC decreases the measurement speed if enabled.
But I didn't expect such a low sample rate of under 1 S/s.


Is there any possibility to improve the measurement speed? And to add a filter afterwards.

Thanks for any advice.


Download All
0 Kudos
Message 1 of 2

@shavo wrote:

Is there any possibility to improve the measurement speed?

Sure.  Lower your resolution.


You are stuck in what every DMM and DAQ has to fight: accuracy vs speed.

There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
"Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
0 Kudos
Message 2 of 2