Products > Test Equipment

Build battery for Fluke 123 and question about the power supply

(1/3) > >>

dimani4:
Hi people,

I'm new to this forum so please be kind to me  ;)

I know there are lot of questions about that topic but I didnt find answer to my specific question. I try to build my own battery for the Fluke123 according this video: .

The same I want to buy 4 1.2 V 2200mAh Ni-Cd batteries in Aliexpress (https://www.aliexpress.com/item/1005004231418506.html?spm=a2g0o.productlist.0.0.f2045568EOGvVn&algo_pvid=404d0240-e5f6-4808-ad41-816799ff0c9d&algo_exp_id=404d0240-e5f6-4808-ad41-816799ff0c9d-5&pdp_ext_f=%7B%22sku_id%22%3A%2212000028464217791%22%7D&pdp_npi=2%40dis%21ILS%2138.92%2125.28%21%21%21%21%21%402100bddd16646301570381475e0ddf%2112000028464217791%21sea&curPageLogUid=8YPpTcA9QS21) (it turns out cheaper than in Amazon). Than I need to connect resistor and some thermistor (I'm not sure). My question where exactly to connect it and what parameters of these parts? I took some screenshots from the video:
Here it is:
The 3 wires (2 blacks and white one should be connected to one terminal) and the red wire to the other terminal. So what parameters of that thermistor which is connected to the white wire (see question mark in the picture)? There is also small resistance (another question mark). what parameters? I heard guy said 1.2Ohm but what power, 1/2W should be enough?
All I have from the battery is the connection....

One more question. Can I use power supply of 15V but the maximum current of 2A (instead 300mA) for fluke 123?

Thank you very much.

picburner:
The mysterious object covered with heat shrink is a 70°C thermal fuse.
Instead the little ball is an NTC.
However in this tread  you should find all the answers.

dimani4:
Thank you for the answer.

Just to be sure for your answer:



In 1 I connect thermal fuse of 70°C.

In 2 I connect NTC thermistor.

Right?

And this question below. Here: https://www.eevblog.com/forum/testgear/fluke-123-scopemeter-and-battery-replacement/?all they didnt speak about that.
Can I use power supply of 15V but with the maximum current of 2A (instead of 300mA) for fluke 123?

Thank you very much.

picburner:
Yes, 1 thermal fuse      2 NTC thermistor.

I don't own a fluke 123 and I don't know the characteristics of the power supply.
If the power supply is constant voltage then your 15V 2A power supply is fine too (the
charging current is generated internally by the instrument).
If it is the power supply that directly generates the charging current for the battery,
then a special constant current power supply (300 mA) or its original one is required.

dimani4:
Thank you for the answer.

Here I'm looking for the NTC thermistor and Thermal fuse. Can you tell me please which one fits?

NTC Thermistor https://www.aliexpress.com/item/1005002742725642.html?spm=a2g0o.productlist.0.0.7c5e6381YLXViZ&algo_pvid=6a1d7cb2-bc84-49c2-950f-9b791892e4d7&aem_p4p_detail=202210020037275442154723973380005726442&algo_exp_id=6a1d7cb2-bc84-49c2-950f-9b791892e4d7-0&pdp_ext_f=%7B%22sku_id%22%3A%2212000022664837901%22%7D&pdp_npi=2%40dis%21ILS%212.98%212.98%21%21%215.24%21%21%402100bb5116646962471402047e1494%2112000022664837901%21sea&curPageLogUid=3nzlpC54mCLM&ad_pvid=202210020037275442154723973380005726442_1. What resistance?

And thermal fuse: https://www.aliexpress.com/item/1005003146926636.html?spm=a2g0o.productlist.0.0.58c343acRxdeqv&algo_pvid=39e8f362-d116-4e8a-a3e1-f055def8251e&aem_p4p_detail=20221002003020454350349408820005773289&algo_exp_id=39e8f362-d116-4e8a-a3e1-f055def8251e-2&pdp_ext_f=%7B%22sku_id%22%3A%2212000024351023200%22%7D&pdp_npi=2%40dis%21ILS%216.45%216.32%21%21%212.42%21%21%400b0a182b16646958198375627e84db%2112000024351023200%21sea&curPageLogUid=vEnH1QCQcFUx&ad_pvid=20221002003020454350349408820005773289_3. What current?

Thank you very much.

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod