internal voltmeter accuracy?

[landwerlen]

we are noticing about .8 to 1.0 vdc difference (lower indications)between the voltmeter on the EMS D120 and our calibrated shop voltmeters. any ideas? thanks john

 

[dynonsupport]

Whether or not the voltage you're measuring is the same the one that the EMS is receiving depends on a number of factors, including how good the wiring is, how good the grounding is, whether there are diodes installed in the system anywhere. To really test, you'd need to make sure you're measuring close to the EMS pins, essentially.