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Some old school instruments showing how it's done (HP 3325A and Fluke 8506a)

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srb1954:

--- Quote from: garrettm on January 31, 2021, 05:11:19 am ---Prior to the release of the HP 3458A, the 8506A wasn't a bad metrology grade meter. Though there were still arguably better meters from Solartron at the time. And while HP's 3456A had better DC volts spec below 100V as well as more comprehensive math functions, the 8506A's AC volts spec was pretty impressive for a 6.5 digit meter.

--- End quote ---
At the time the 8506A was pretty much the best AC accuracy you could get in a DVM. To get better accuracy you had to move up to an AC-DC transfer standard.

joeqsmith:

--- Quote ---Then exercise the DC conditioner relays sending "R2?" and "R3?" several times, each time with a 1 second delay.
--- End quote ---
Why?  Are the relays in yours starting to fail?

With mine using RS232, afraid I can't be of much help on the software side of things. 


--- Quote from: garrettm on January 31, 2021, 05:39:39 am ---
--- Quote from: joeqsmith on January 31, 2021, 05:20:06 am ---881722 with a blue dot next to it.   You may also notice that many of the guides have been replaced as well.  There are at least three different colored rails used.   Guessing it was maintained by Fluke and the upgraded plugin was part of their service.

--- End quote ---

Well, you're in luck! That's the same number as mine, so you have the latest DC signal conditioner that I am aware of.

Here's a picture of my modules if anyone is interested.

--- End quote ---
If you like, I can take some decent pictures of this board to compare with yours and see if there are any differences.  Perhaps the performance was improved to the point that Fluke would just upgrade them as part of their service.   

dietert1:
Had some trouble with the relays of one unit (after not having used the Flukes for two or three years. Same as the front/back switches in some other DVMs.

Regards, Dieter

joeqsmith:
The front rear switch on this meter had also oxidized.  I doubted I would find a replacement so  I ended up flushing it, then running about 50mA at a 1V through each contact while I cycled the switch assembly 10-20 times.  Then flushed it once more.   Took several minutes to go through them all but the switch is now very quite. 

I was a bit surprised that was the only mechanical issue with the meter.

SilverSolder:

--- Quote from: joeqsmith on January 31, 2021, 03:57:00 pm ---
--- Quote ---Then exercise the DC conditioner relays sending "R2?" and "R3?" several times, each time with a 1 second delay.
--- End quote ---
Why?  Are the relays in yours starting to fail?

With mine using RS232, afraid I can't be of much help on the software side of things. 


--- Quote from: garrettm on January 31, 2021, 05:39:39 am ---
--- Quote from: joeqsmith on January 31, 2021, 05:20:06 am ---881722 with a blue dot next to it.   You may also notice that many of the guides have been replaced as well.  There are at least three different colored rails used.   Guessing it was maintained by Fluke and the upgraded plugin was part of their service.

--- End quote ---

Well, you're in luck! That's the same number as mine, so you have the latest DC signal conditioner that I am aware of.

Here's a picture of my modules if anyone is interested.

--- End quote ---
If you like, I can take some decent pictures of this board to compare with yours and see if there are any differences.  Perhaps the performance was improved to the point that Fluke would just upgrade them as part of their service.

--- End quote ---


Every circuit board has a revision letter written on it.

The manual has a page that explains what revision letters are covered by it.  This particular manual is probably too old to cover the newer model numbers...  but presumably the newer models have revision letters too.

In my collection of parts, I have encountered a wide range of revision letters, so chances are quite good that we don't all have exactly the same modules...







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