Products > Test Equipment

Fluke 123 Scopemeter and battery replacement

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DMM123:

--- Quote from: none on May 19, 2019, 08:55:43 am ---
@ DMM123
I think the information about thermistor and fuse is somewhere in this thread, or on the Fluke forums (try the links I posted previously) - I've seen it before.

EDIT:
These threads might be of interest:
https://www.eevblog.com/forum/testgear/usb-powered-fluke-123/
https://www.eevblog.com/forum/testgear/fluke-123/ (power supply)

--- End quote ---

Thank you, but I still don't see the thermistor value (beta), the part number, or the range of the thermistor in temperature.  I have contacted a thermistor manufacturer and given them 40 measured values at different temperatures with the kOhm readings on the old battery.  I will post what they say.

Jcm05:
Hello,

My Scopemeter does not work after battery exchange.
After seeing verified I found a polarity reversal of + and - on the battery.

This has caused a short internal circuit to my scopemeter and it does not work even connected to the power supply.
The 3 resistors R504, R506 and R507 have burned.
I replaced them but he still does not work.

Have you ever encountered the same problem and what is the solution?

Thanks for your help.

DMM123:

--- Quote from: DMM123 on May 19, 2019, 01:11:32 pm ---
--- Quote from: none on May 19, 2019, 08:55:43 am ---
@ DMM123
I think the information about thermistor and fuse is somewhere in this thread, or on the Fluke forums (try the links I posted previously) - I've seen it before.

EDIT:
These threads might be of interest:
https://www.eevblog.com/forum/testgear/usb-powered-fluke-123/
https://www.eevblog.com/forum/testgear/fluke-123/ (power supply)

--- End quote ---

Thank you, but I still don't see the thermistor value (beta), the part number, or the range of the thermistor in temperature.  I have contacted a thermistor manufacturer and given them 40 measured values at different temperatures with the kOhm readings on the old battery.  I will post what they say.

--- End quote ---

Well, so far no answer.  I've emailed a couple of times but no response.  Initially they said they would have an answer in a couple of weeks.  Patience, I hope, is the key.

iurius:
Thank you very very much!

alwanuel:
Hi, would you please consider a YouTube video, what you did is really useful, please consider to share it properly. Cheers.

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