| Electronics > Projects, Designs, and Technical Stuff |
| Harbor Freight Multimeter Add-on |
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| mikerj:
--- Quote from: Wimberleytech on June 22, 2019, 02:26:09 pm ---Regarding voltage/current...it is natural for us to think in terms of voltage. However, as I said, it does not matter for a given (known) resistance as long is there is some quality metric (e.g., 4mA is good, 3mA is bad) to inform the test result. Voltage is no more informative than current because the usefulness of your battery depends heavily on your application. --- End quote --- This is true for a single cell, which is all your adapter appears to cater for. For a multi-cell battery voltage under load is a more useful measurement since a battery with a shorted cell may still be able to supply sufficient current, but you'd have no idea the voltage was incorrect. |
| floobydust:
This works for me, a few seconds to test. 50mA AA load and the manual has the pass/fail voltages. |
| rsjsouza:
That is a nice adapter. I have been meaning to create something like this for my meters. It's been a long time since I have used my pair of HF meters, but it seems this function is identical to the Aneng mini: it has both 1.5V and 9.0V battery testers that only display the measured current - a bit of a cop out. IMHO the Aneng uses much more useful currents of 40mA and 25mA respectively. I have another meter (Mestek DM91A) that actually reports the voltage under load (30Ω and 300Ω for 1.5V and 9.0V respectively). |
| Wimberleytech:
--- Quote from: rsjsouza on June 24, 2019, 07:51:22 pm ---That is a nice adapter. I have been meaning to create something like this for my meters. It's been a long time since I have used my pair of HF meters, but it seems this function is identical to the Aneng mini: it has both 1.5V and 9.0V battery testers that only display the measured current - a bit of a cop out. IMHO the Aneng uses much more useful currents of 40mA and 25mA respectively. I have another meter (Mestek DM91A) that actually reports the voltage under load (30Ω and 300Ω for 1.5V and 9.0V respectively). --- End quote --- The Aneng mini is $3.34 on Amazon with free shipping...lol |
| tooki:
And...? The DT830B like your harbor freight one are available for a dollar, including free shipping from China. Nothing to brag about. |
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