Products > Test Equipment
Fluke 123 Scopemeter and battery replacement
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klim:
Hi i'm interested in the 18650 Battery battery mod for Fluke 123. Is there not a problem to drive the Fluke 123 with 150% (7,4V instead of 4,2V) of it's specified voltage battery level?

This is the original battery pack pinout.

Pin 1 Not Connected
Pin 2 +
Pin 3 -
Pin 4 I Identification (0 Ohms=NiCd) (825 Ohms=NiMh) Return on Pin 3
Pin 5 Not Connected
Pin 6 T Temperature Sensor (NTC Resistor) Return on Pin 3

How do you have connected the identification resistor und NTC in your 18650 battery pack?
klim:
One more question: have you used cells with protection board (built in cell / external pcb)?
rsivan:

--- Quote from: klim on September 12, 2014, 09:43:37 pm ---Hi i'm interested in the 18650 Battery battery mod for Fluke 123. Is there not a problem to drive the Fluke 123 with 150% (7,4V instead of 4,2V) of it's specified voltage battery level?

This is the original battery pack pinout.

Pin 1 Not Connected
Pin 2 +
Pin 3 -
Pin 4 I Identification (0 Ohms=NiCd) (825 Ohms=NiMh) Return on Pin 3
Pin 5 Not Connected
Pin 6 T Temperature Sensor (NTC Resistor) Return on Pin 3

How do you have connected the identification resistor und NTC in your 18650 battery pack?

--- End quote ---
yes I've used normal cells but protection board is on battery holder,I leaved resistor on wiring, keeping  NiMh setting,about higher voltage: I done some test,starting from 4,5v to 10-12v and watching at current drain, from 4 to 9-10v current drain going down while increasing voltage,this good because internal LDO in fluke controller doing the right job,after 10-12v start  to rise ,and this not good,but for us running on Li-Ion is perfect because will never go above 8.4v(4.2*2) ,also stand-by current drain is very low like 1-2mA same as original or lower.
klim:
Hi rsivan and thank you very much for your reply.
Now it's time to renew my Fluke 123 with new state of the art li-ion powered energy ;-)
melhookv12:

Hi I have also purchased a Cameron Sino battery from e bay. I tried a refresh cycle and had no luck. After using Google I ended up here.

I also think my battery is wired incorrectly but I have no reference to relocate the wires. Can someone confirm the location of pin 1. I have tried to attach a picture and it is with the security tag facing upwards. In the op's it doesn't show a tag on the connector, does this mean its facing downwards or it doesn't have one.

Any help greatly appreciated.
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