Ni 4070 yields diff result with Handheld DMM

[jurich1904]

Hi,

im using NI PXI 4070 DMM to measure a square wave with f=800Hz, i got a result of 4.4V.

i used CVI, and with autozero_dmm.

however, using the handheld DMM(fluke), i got 4.7 (which is what im expecting).

any ideas please?

[GarPar]

Hi jurich1904-

     Are you measuring this signal in AC or DC mode? In your post, it seems like you are calculating a DC value from an AC signal.  Maybe I am just not understanding correctly - are you saying that the peak of this square wave is at 4.7 V and you are only reading 4.4 V?  If you are in AC mode, what have you set your bandwidth limits to be?