Beckman DM73 Circuitmate Multimeter: Ground Clip

Among the many treasures Mad Phil left me was a Beckman DM73 CircuitMate multimeter (manual at the Boat Anchor Manual Archive):

Beckman DM73 - new ground clip

Beckman DM73 – new ground clip

Although it’s rated to 500 V, it violates the fundamental principle of high-voltage electronics debugging:

Always keep one hand in your pocket!

The scorched and truncated probe tip on the “ground wire” shows Phil slipped at least once:

Beckman DM73 - probe tip

Beckman DM73 – probe tip

After far too long, I sacrificed a black multimeter probe from the heap, soldered an alligator clip on the end, and, henceforth, will use it appropriately. Mostly, I never do any high-voltage work, but you never know.

I suppose I should splice that nice black probe onto the end of the Beckman wire¬†for low-voltage work…



  1. #1 by Trudi on 2015-10-14 - 08:34

    Philip Herman… gone but not forgotten. A fine engineer and a wonderful friend.

    • #2 by Ed on 2015-10-14 - 19:52

      Generous with both hard-won knowledge and good stuff…

  2. #3 by Mike on 2015-10-14 - 16:48

    If i remember correctly, WA2EBK…

    • #4 by Ed on 2015-10-14 - 19:52

      Aye, that callsign will be up for grabs in a few years. May the next owner wear it well…

  3. #5 by Jim R on 2015-10-14 - 19:59

    Would that I knew him.

    I have one of those – rides around in my backpack most everywhere I go. I seem to recall that probe will plug into a pin jack (or is it a v.35 jack?) soldered into the end of an alligator clip… I’ve also been know to use a clip lead to the probe tip on the body and use the negative probe for getting into difficult spaces, mentally changing the sign.