Products > Test Equipment
Fluke 123 Scopemeter and battery replacement
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wptski:
This thread is a bit old but my post is on the same topic.

I have a Fluke 120 and maybe it's a bit different.  I have 18650 cells and a PCB type holder coming.  I first tried using a power supply raising the voltage to 8.4V and watch the current decrease just like mentioned above.  I used a harness from a BP120 Ni-CD pack and connected two old 18650's I had which worked fine.  The charging part of the mod "might" be too much for my old soldering skills so keep that in mind.

I had another Ni-CD pack still wired up so I connected that.  Connect the OEM power supply at it charged at 400mA.  Now with the 18650's connected, the battery drain increased by almost 100mA.  Either the 120 is different or that's what the charging part of the mod cures.  I'll just use battery power and charge the cells with another charger.

I've been having a guy that builds packs build them for me and I just add the old harness.  Been doing this for a Fluke 199B, 43B and the 120 going back to 2011.

The user that posted this mode hasn't been here since that time so I'm guessing this post won't be answered.
rsivan:
Hello guys,my fluke still working fine no fire no explosion so mod was ok ;-)
if you look at service manual for scope also search for f199 or f99 you see all circuit, to adjust charge current just hack the 3 shunt resistors ,increasing it will be decrease charge current,
only important things: do not overcharge, so without battery connetcted to  fluke voltage on battery plug must not go over 8,4v.....(this based to li-ion batt 3.7v main rule...)
wptski:
I'm affraid my old soldering skills aren't for surface mounted components.

I received the protected holder(s) and the same 18650 cells that you used for your mod.  Wired my Fluke 120 and working on a Fluke 43B PQ meter which is basically a 120 with different buttons.  Without any internal circuits being modified, cells nearly fully charged, connected to AC power, current still draws from cells.  It appears(monitoring that right now), as cells deplete near 7.3V which is the OEM charging voltage the cells "should" switch to CV mode.  Right now at 7.5V, current is at 140mA down from 300mA>.

Battery only mode for me is okay.  The catch is one either charges the cells while in the holder as a pack removing it every time or remove the cells and charge them however.  The PCB in the holder has to be RESET after cells are removed more than a few seconds.  Plugging in the AC power will RESET the PCB as well.

Seem to bottom out drawing around 40mA from the pack so I halted the test.

EDIT
After several hours the draw on the batteries the current goes to zero so the pack never goes below 7.5V so not that bad really.
f11:
@rsivan , Thank you very much ! My Fluke 123 is powered by Li-Ion battery.
 
 f11
EIKA:
Hi folks!

I am in the same boat as you. Dead batteries and no power on even after long charge. Device is BNIB, but 5 years old :-BROKE

What is the name of cells used in BP130 battery (OEM one for Fluke 124)?

Sub C (23x43 mm)? 4/5 Sub C (23x34 mm)? Or something else?

Thanks & have a nice weekend!
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