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Fluke 123 Scopemeter and battery replacement

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Barniboy:
Dear "Cones"
Like "patrickdevos" I also feel some confusion about the actual pinout numbers for the connector plug itself.
Could it be as per attached (as seen from the rear, i.e. where the wires come out) ?
From your picture "correct Plug wiring" it seems that only the top black wire (terminal 4 if I am correct in the attached sketch) goes definitely to the identifying resistor.
The white wire (terminal 2 if I am right in the attached sketch) seems to go the NTC resistor, hidden in the shrinked tube, I think. But this should go to batt. plus directly ?
The other black wire, and the red can not be determined from your photo.

Is it possible for you to clarify the actual connector pinout ?

carl_lab:

--- Quote from: Barniboy on August 16, 2016, 09:28:37 am ---Dear "Cones"...
Is it possible for you to clarify the actual connector pinout ?

--- End quote ---
Is this the battery side or instrument side connector?



(PS:
Correction (see my next posting): This is the battery side connector view from the "holes" side, not from the "wires" side, as you wrote)

Barniboy:
Hello Carl_lab
First, please note that my attached sketch is my question, not my statement.
My reply to your question: As the sketch indicates in text, it is a question regarding battery connector pinout, as seen from the rear of the connector where the wires come out.
Have I got his numbering right, with respect to the numbering in the Fluke Service Manual ?
Again: The Fluke SM schematic is very clear on terminal connector numbering, but no clue is given as to what numbering the corresponding terminal pinout on the instrument PCB are, nor the battery connector receptacle.
This is probably the reason why almost every aftermarket replacement battery is wired wrong, according to many posts in internet media.

carl_lab:
Hi Barniboy,
I did not open my battery yet, but if I look at this photo, I'm pretty sure the red wire is battery+.
The next (thinner black) wire in the middle of the upper row is connected to the "ident resistor".
The white wire seem to be connected to the NTC.
The last wire (black) must be battery- and goes to the middle position on the lower row of the connector.


 (c) Cones

So your sketch seems to be correct, but mirrored battery connector side (or in other words: your sketch shows the connector from instrument side correctly).

You can compare with your original battery connector!

carl_lab:
Has anybody tried a single LiIon cell (3.0-4.2V)?

At which battery voltage does the low battery indicator appear and when will the scopemeter shut down?

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