Help with Fluke 87-V

[peter-b]

Hi,

I am just learning and doing electronics as a hobby and I recently purchased a Fluke 87-V. It is spot-on except its AC measurements are puzzling - it seems the readings are off by 10-20% or even more. I noticed its AC readings (both the voltage and current) did not match some other sources. Then I connected it to a NI DAQ generating a perfect sinusoidal volatge signal and it was still off: For 1VAC where RMS should be 0.707 it was hovering around 0.5 and not stabilizing. Peaks were wrong: instead of +1 max and -1 min it is something like +0.4 max and -1.63 min; the frequency measuremets are also way off along with duty cycles.

Could somebody explain is that ‘normal’, is that something I did wrong (but with such a simple setup it should measure correct values!), do I need to ask Fluke for service and what is going on?

Thanks
Peter

 

[peter-b]

I spent more time studying 87-V and testing it, and it turns out the mistake was mine - the DMM is spot on, in fact, very precise. I just had to learn to use it properly.

Great product, Fluke!!!