Products > Test Equipment

Metrix MX56C / BK Precision 5390 Multimeter Teardown

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Vince:
- Got it wrong, original 10M was only 0.25W.... but I ordered an 500mW one, oh well, can't harm I guess, and it still fits in the enclosure so all is well.

- That Weller PCB stand came in quite handy to solder the 10M resistor on to the board.

- Soldering the RF shield back on.

Vince:
- Now we can put the meter back together again at last

- the 55 and 53C checking each other...

- The 53C measuring duty-cycle spot on from the old function gen.

- A complete and brand new MX 53C, with full calibration data and still the protective strip on the LC window, what more could one dream of ?!


Vince:
Mini comparative tear-down of the 53C vs the 54/55/56 :

- soldered RF shield replace by a foil in the back cover

- all the RMS related circuitry has disappeared from the back side of the main board

- as well as all the current shunt and analog switch of the mA ranges, on the top side of the PCB.

- potted precision network/divider had been replaced by a more modern ceramic substrate as we commonly find on the Fluke meters

- Quite a bit of corrosion on the negative terminal of the battery, but it cleaned up just fine, the PCB lower down, was still in good shape.

Vince:
Is it possible to have TOO MANY MX50s meters ?!  I don't know... Aren't they cute, keeping each-other warm ?! :-)
I just happen to really love them ! LOL

retiredcaps:

--- Quote from: Vince on September 08, 2016, 09:27:43 pm ---Is it possible to have TOO MANY MX50s meters ?!

--- End quote ---
I hope your weekend is free because I'm curious why your 53C doesn't support Hz and Surv like my BK 5360?

PS. Modemhead did all the modifications, without schematics too  ;), on this meter.  :-+

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