Products > Test Equipment

Metrix MX56C / BK Precision 5390 Multimeter Teardown

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Robomeds:
macboy,
Thanks for the great additional information.  I wish they had setup a more accessible IR location with this meter.  The need to sell a new battery 'door' just so you can use the IR stuff seems really dumb.  Still, the few times I will data log I don't think high voltages will be an issue.  As I have access to a 3D printer I might make a cable per your link. 

retiredcaps:

--- Quote from: macboy on July 29, 2013, 12:05:26 am ---Recently I made a little RS-232 interface from an IR led, a phototransistor, a couple of resistors, and a $2 USB-to-RS232 adapter from eBay (search for PL2303HX).

--- End quote ---
Got a picture of your homemade cable?  I'm interesting in possibly building one.

macboy:
The circuit for the IR I/F is very simple. TTL level serial is active low, so on the transmit, you connect an IR LED and current limiting resistor in series between the +3.3 V and the TX pin. On the receive side, an IR phototransistor is used to pull the RX pin low. The USB-serial adapater can be found on eBay from Asian sellers for $2 or less. Search ebay for PL2303. In an earlier post in this thread you will find links to a manual with the serial protocol for these meters, and link to calibration software from BK.

TheEPROM9:
Found one of these in the WEEE bin at uni, fully functional, not sure why someone would ch8ck such a nice meter. Sadly when testing the current on my new meter the cheap PSU could not take it and died, the fuse in the PSU exploded and the power trans have probably shorted. Oh well I will just have to fix it again.

retiredcaps:

--- Quote from: TheEPROM9 on January 30, 2015, 01:59:11 pm ---Found one of these in the WEEE bin at uni, fully functional, not sure why someone would ch8ck such a nice meter.

--- End quote ---
Good score for free.  :-+  :-DMM

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