Products > Test Equipment

Old Fluke Multimeters

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elecdonia:
I may be able to provide some info about op-amp substitutes that work well and perhaps even improve the accuracy and stability. I own an entire shelf of 8600A and 8800A. Many different vintages. I was able to get most of them to exceed specs. It’s somewhat unusual for these op-amps to fail.

I also converted a very rough 8800A into a programmable DC preamp with extremely high input impedance and the capability to handle +/- 20V inputs. I use it as a front end for logging devices based on Raspberry Pi and/or Arduino hardware.

med6753:

--- Quote from: elecdonia on May 26, 2019, 06:18:35 pm ---I may be able to provide some info about op-amp substitutes that work well and perhaps even improve the accuracy and stability. I own an entire shelf of 8600A and 8800A. Many different vintages. I was able to get most of them to exceed specs. It’s somewhat unusual for these op-amps to fail.

I also converted a very rough 8800A into a programmable DC preamp with extremely high input impedance and the capability to handle +/- 20V inputs. I use it as a front end for logging devices based on Raspberry Pi and/or Arduino hardware.

--- End quote ---

OK, I'm game. I own both an 8600A and an 8810A. What op-amps do you recommend changing and with what type? 

GregDunn:
I'd be interested too.

I suspect this meter met with an "accident" because there were a few components in the input section which had telltale flux residue (and lots of it) on their pins.  I doubt any of my 8600s will have a similar failure, but it's good to know as much as possible about the hardware requirements just on G.P.

Pablitox:
Eh acquired a fluke 8060a Ibm.  I read the Mrmodemhead Guide and looking for the C28 capacitor my board does not have it.  It has the through holes but there are no signs that that component has been removed there.  Why?

Electro Detective:
That's a weird one and looks to me like there was a cap there 

Maybe the board had track issues and cap soldered somewhere else?  :-//

or maybe it was a leaker and someone plain forgot to get around to getting the part,
and because the meter 'apparently' worked fine without it, why bother..  ::)

Check to see if any other mods done before considering to replace it,
and wait for some better/reassuring info here  :phew:

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