I purchased an HP 3456A off eBay a couple of weeks ago and the first thing I did was check the DC voltage (5V reference from voltagestandard.com) and resistance (Vishay S102C Metal Foil Resistor .01%) Both measurements were great. I never checked the AC voltage because I don't have anything as a reference.
Today I needed to use the AC voltage function because I am trying to learn how to calculate capacitor ESR with a function generator and oscilloscope (I have an ESR meter, but I don't like using "crutches" during the learning process). I need to set the FG (BK 4011) @ 1.00 Vpp output with a 200KHz square wave so I was using my Fluke 87V to do so and thought that this was a good time to see how the 3456A measures AC voltage also. Well, I have two very different readings. The 87V reads 2.637V and the 3456A reads 3.6742V
It could be that I have something set up wrong on the 3456A, as I don't know much about measuring AC volts and I'm just learning more about the 3456A. I looked in the manual for help, but didn't really see any thing that would have given me a tip of what I've been doing wrong for the past 4 hours
If anyone can give me some advice that would be great! I really want to know what's going on so I can continue my little experiment as well as knowing that my 3456A and my 87V are ok. I've include pictures below of the readings and also the settings I used for measurement on the 3456A.
Any help would be greatly appreciated.