Products > Test Equipment
UNI-T UT61E Multimeter teardown photos.
Monkeh:
If you put a lithium primary cell in you'll probably need a new meter before you need a new battery.
lagman:
Thanks!
Locally I'll have a hard time finding a 9V lithium primary... Do you know an online store where I could buy it?
EDIT: I found some on amazon but they are 8-12 euros a piece (11-16USD) :/
lagman:
Is this a good idea?
http://www.aliexpress.com/item/1200mAh-Smoke-Alarm-9V-Lithium-Battery-ER9V/1985926539.html
mariush:
Lithium > Alkaline > heavy duty
Get alkaline, best value for money. Lithium will last longer, but probably not as much as 4-6 alkaline batteries that will cost the same (if you make the total).
Also note that the low battery voltage on ut61e shows up at about 5.5v but the meter itself can operate just fine even under 3v, so the batteries you take out of your meter may still work for a few hours to run a clock or something using very low power, with the 5-5.5v the battery has left.
Lithium 9v batteries start at about 8.4v and they're completely dead at about 5.4v so you would get almost all of their energy before the meter says low voltage.
For example, you can see in this datasheet http://data.energizer.com/PDFs/la522.pdf that with 5mA draw (a bit more than what UT61E draws) the battery will last about 800 hours.
To compare, you have here an alkaline battery datasheet: http://data.energizer.com/PDFs/522.pdf on page 2 you can see that with about 10mA draw, the battery will go down to about 6v in around 70 hours. So you can extrapolate about 150 hours at 5mA and down to 5.5v...
Legit-Design:
--- Quote from: lagman on August 16, 2014, 04:17:09 pm ---Thanks!
Locally I'll have a hard time finding a 9V lithium primary... Do you know an online store where I could buy it?
EDIT: I found some on amazon but they are 8-12 euros a piece (11-16USD) :/
--- End quote ---
Yes, good quality lithium primary batteries cost money. If you don't pay for good quality you might get crap, if you don't get crap you got lucky.
--- Quote from: lagman on August 16, 2014, 04:37:22 pm ---Is this a good idea?
http://www.aliexpress.com/item/1200mAh-Smoke-Alarm-9V-Lithium-Battery-ER9V/1985926539.html
--- End quote ---
Most likely you will get old stock that is already partially discharged or maybe even faulty, order at your own risk.
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