Author Topic: C.A. 5275 [Chauvin Arnoux] digital multimeter (teardown and minor repair)  (Read 1145 times)

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Offline NiftyTopic starter

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Background: Two weeks ago, on a local FB market I saw a digital multimeter "C.A. 5275". During this time, the price was reduced from 200 to 75 euros :) apparently, this brand is not very popular in our area. Comes with original probes and holster. Because the price was quite low and I never had a "Chauvin Arnoux" (or Metrix) multimeter (is anyone had?), I bought it out of curiosity.
The seller was in another city, so I couldn't test the multimeter.
Given the seller's strange Facebook profile, I resigned myself to the fact that I might not receive anything or something was wrong with the multimeter  ;)

In my multimeter, both fuses (630mA and 10A) were blown. After replacement, everything works. Extra 15 euros for fuses  :(

During disassembly, I paid attention to the rigid connection of the probe terminals to the PCB. And (surprise, surprise) the common terminal was already loose. I had to solder it more securely. You shouldn't do this, if the PCB is in the case, the plastic bushings of the terminals melt very quickly.

Like:
The original probes are modular, quite long (1.5 m) with silicone wires.
Nice backlight.
"OFF" position on both sides! Yeah baby!

Do not like:
Not the fastest continuity measurement.
Flimsy mode switch.
« Last Edit: September 27, 2022, 08:31:51 pm by Nifty »
 
The following users thanked this post: coromonadalix

Offline coromonadalix

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Re: C.A. 5275 [Chauvin Arnoux] digital multimeter (teardown and minor repair)
« Reply #1 on: September 27, 2022, 07:14:15 pm »
the pic 18f  used as a display driver ?? 
 

Offline NiftyTopic starter

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  • Country: lv
Re: C.A. 5275 [Chauvin Arnoux] digital multimeter (teardown and minor repair)
« Reply #2 on: September 27, 2022, 08:23:05 pm »
the pic 18f  used as a display driver ??

Yes, sir! :)

PIC18F85J90

* An integrated LCD driver module, capable of driving 48 segments and 4 commons for LCD display
* Integrated LCD Voltage Boost Regulator
 


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