Electronics > Projects, Designs, and Technical Stuff
Harbor Freight Multimeter Add-on
Wimberleytech:
I use the freebie Cen-Tech multimeter (Harbor Freight gives away from time to time) for testing batteries because it tests them under load. I have a few of them. So I designed this 3D-printed add-on so that this meter is a dedicated battery tester. Still thinking of ways to improve it but works well in the current configuration.
tooki:
That’s cool I guess, but what is the scale used? The manual’s description makes no sense to me:
1.5V at 4mA is 6mW, not 370mW. And I’ve never heard of displaying battery capacity by current, always by voltage under load.
Gyro:
A load current of 25mA for a 9V battery and only 4mA for an AA cell doesn't sound right. That's a moderately heavy load for the 9V but insignificantly low for the AA. :-\
I assume it's using the same resistor for both. The AA reading is going to give a misleading (high voltage) result.
Stray Electron:
How/why is it reading 3.5 with only a single 1.5V battery in the adapter?
Gyro:
3.5mA?
It looks weird. It should be measuring the battery voltage while it is under load, not asking the user to try to extrapolate from the current. :-//
A pretty useless function.
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