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Fluke 5x-II series thermometer tear-down and hacks

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koendv:
The PCB has changed.

Fluke 51-II pcb (top)

The EEPROM  (U11, AT25640N) used for logging has been replaced. The IR-UART bridge (U12, TIR1000) has been replaced with transistors Q7, Q8 and a sprinkling of resistors (level shifters?). Test point J2 and J3 has been added. The analog network around the thermocouple connectors seems unchanged.

This means you still can add a second port, but you can no longer add logging and connecting to a PC.

Unless, of course, we find out what the new components are. Does anyone have a picture of a 53-II or 54-II with the above pcb?  Thanks.

jggearhead10:
I know this thread has been dormant for a while, but I may be able to help with a few requests for information. I have both a fluke 54-II hardware revision 1.5 (latest version from what I can tell). Anyone still interested in a photo of the PCB? Also I have some info on interfacing with these meters without Fluke's software if anyone wants it.

TiN:
Sure we are interested. Did you manage to get continuous logging, or data interface still only can use to read out meter's memory and not the realtime sensors?

jggearhead10:
Sorry about the delay. Here are some pics of the Fluke54-II PCB version 1.5. I notice that there's a "2012" etched towards the bottom-right. I will post info on the remote-specs soon. I can programatically access all functions that Fluke's own software can (flukeview forms). Unfortunately this method pulls all data from the fluke's internal memory. Further hacking would be needed to get real-time access to thermocouple data. This makes sense as the IR cable fits over where the thermocouples are plugged in; i.e. no-one expected to use the meter for real-time logging.

jggearhead10:
More PCB pics of the 54-II (2/3)

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