Products > Test Equipment

Metrix MX56C / BK Precision 5390 Multimeter Teardown

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Robomeds:
I believe the surveillance mode can function like the Fluke touch hold.  You hold the button until it beeps.  At that point it will record a stable reading and beep to let you know the reading has been recorded. 

macboy:
The full version of the SX-DMM software package, which is compatible with these ASYC-II (ASYC2) meters, is now freely available for download at the manufacturer's website. The file you are looking for is "sx-dmmv2.9_0.exe" (or possibly a later updated version) and is found at the DMM support page at:
http://www.chauvin-arnoux.com/en/support/telechargement/results/dmm
You will also find some LabView and LabWindows drivers there.

I just noticed also that the meter is recently supported by SigRok (as of December 2016). The MX-56C is explicitly listed as supported, hopefull other models work too since the protocol is the same (though not all functions are supported by all models).
https://sigrok.org/wiki/Metrix_MX56C

Update: see post below for updated calibration software that works with newer versions of Windows.
I will also once again post a link to the calibration software for these meters. This is a direct link to the B+K Precision website. They sold re-badged versions of these meters with model numbers 5360, 5370, 5380, 5390. This software is compatible with all ASYC-II meters AFAIK.
http://www.bkprecision.com/downloads/software/AK5350.zip

A serial interface is needed for the any of the above software to talk to these meters. Of course they sold an expensive hardware kit to accomplish this, and of course it is long discontinued even if you did want to buy it. Luckily the interface is simple, just a UART at 2400/8/N/1. The physical interface is a IR LED and phototransistor inside the battery compartment. I used a USB-TTL serial interface (any one will do) and used a pull-up resistor and phototransistor on the Rx side, and a IR LED with resistor to Vcc on the Tx side (TTL level UART idles high, not low). You may need to reassign the COM port of your USB-UART to 1 through 4, then simply point the software to that COM port and it should work. You need to hold the "PK +/-" button while turning on the meter to enable the RS-232 interface.

The serial protocol is fully documented, in several languages, in a file called NF-SX-ASYC2.pdf.

I normally don't necro-post, but since this thread has become the definitive source of knowledge on this multimeter series, I decided it was the best place for it.

Vince:
Thanks a lot for all this Macboy !  :D

I haven't psote on here for a year or so, but have not been inactive on this front though :in the mean time, I bought literally a dozen of these meters !!!   :D

I just can't enough of them !  :D

I did see an MX 56C in his carry case in like new condition AND in the case was... the serial cable/adapter and the raised front panel that goes with it... a gem... couldn't believe it ! Sadly it sold in an eye blink and I arrived to late....  :(

macboy:
Direct links to latest version of calibration software, compatible with x64 Windows (tested here with Win7 x64). The previous version linked in above posts is a 16-bit Windows application, so it won't work with anything newer than 32-bit Win XP.
 
http://www.filiale-de.chauvin-arnoux.com/sites/default/files/download/sx-asyc2cv23.zip
or
http://www.chauvin-arnoux.com/sites/default/files/download/sx-asyc2cv23.rar

Vince:
Thanks for the update  :-+

I ought to build a serial cable one day, and start fiddling with all my MX53/54/55/56 meters.. because hell, I just love these meters, it' s officially a disease of mine now, bought a dozen of them in a short time, couldn't help...  :-//

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