Products > Test Equipment
Some old school instruments showing how it's done (HP 3325A and Fluke 8506a)
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SilverSolder:

--- Quote from: trobbins on October 28, 2021, 11:03:44 am ---With respect to the first post in this thread, another factor influencing comparison accuracy would be the 50 ohm termination used.

Silversolder, what would be interesting is with the measurement made at the 8506A frequency extremes.  One hassle with cross-comparing sine amplitude for the 3325A is that few 5-6 digit meters have frequency response below 1Hz and above a few hundred kHz (well not the meters I have, so I have to resort to a 3400A for anything approaching a MHz, and beyond).

--- End quote ---

I'm in the middle of reorganizing my work area, when it is back up again I'll give that a try...
1audio:
A short note re AC stability-
I have a Fluke 510A at 2400 Hz connected to my 8506A for 24 hours now. I had carefully adjusted the 510A to match my 732A with the 540B. (This sounds like some strange secret code.) The 8506A has read from 9.99999 to 9.99960 during that period in an unheated garage. I think that is well within the specs for both instruments. The 8506A was last calibrated in 2012.
I'll check its response at extremes in the next few days.
1audio:
I checked the AC accuracy of my setup. I am using a vintage Optimation calibrator and have accumulated some of the essentials to calibrate it and etc. They all disagree to some level, which is to be expected. I chose to standardized on a Fluke 10V A55 thermal voltage converter since it has the least that can go wrong.

I measured everything at 7V because measuring at 10V has the risk of an overvoltage pulse when switching ranges and switching down range and back will require a long wait for the converter to stabilize. What is encouraging is that everything is in tolerance except the 1 MHz range of the calibrator. This is actually quite a relief and I can move on to other endeavors (like calibrating the 100V range of the calibrator). . .

trobbins:
Sounds like it was worth the effort to check to 1MHz limit end  :-+
Neptuni:
Hi folks,

I now have a 8506A and a 8505A kind of working.
The 8505 with RMS, ohms and current, the 8506 with ohms. Both instruments with GPIB.
I also bought some spare cards for the future.
The 8505 has software version 5.01 and the 8506 has 6.05
Both instruments have the same issue, the reset procedure at boot restarts continously. If I press and hold the reset button on the frontpanel the instruments will come out of the reset cycle and work normaly.
I have started to recap the instruments, but still work to do.

Mikael, Sweden
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