Fluke 8020B Teardown

This Fluke 8020B DMM dates from somewhere in the early to mid-80s and is an updated version of the 8020A, Fluke’s first handheld DMM. The eBay seller’s description said this one “would not power up”. However, when I installed a battery, it worked perfectly. Overall, the unit is in very good cosmetic shape, especially after a thorough cleaning. The button for the AC/DC selector switch was missing, but thanks to a friend at the EEVBlog.com forum, a spare has been fitted, making the unit complete.

Discussion of this topic can be found at EEVBlog Forum.

About modemhead

Fixologist and multimeter junkie.
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3 Responses to Fluke 8020B Teardown

  1. Rahul says:

    Hi,
    I’ve one 8020B with me. Was lying in my garage and its been a long time I guess since someone used it. Put in a new battery and powered it on. I was happy to find it turned ON and the display said BT at left corner with 0.00 reading. The continuity and 200M ohm resistance seems to be working. Unfortunately it takes no reading for voltage, ampere or diode test. Its shows zero in these case. What could be the possible issue? Thought I did ask first and see if its salavagable before binning it.
    Cheers.

    • modemhead says:

      At the heart of these models is a large ASIC chip responsible for analog-to-digital conversion and driving the LCD. All functions depend on it. If any one function works perfectly, then there is a good chance the chip is functional and the fault lies in an external component. Most likely causes are front-end components like the power resistors near the input, the PTC thermistor, and in this case, maybe the switches.

  2. Roger Bourdel says:

    Had an Oops with my 8020B. A troubleshooting result is the famous R2 1K WW resistor. Do you know of a source for that part? Thanks for your help on this matter.

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