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Lower voltage for resistance measurement for FLuke 289
tonycstech:
I have fluke 289.
measuring 1.8v buck converter based circuit gives me incorrect resistance compared to other meters.
It gives me ohms instead of kohms.
This is because fluke 289 uses 2v to measure resistance and if you change the range, it will jump to 5v.
This is a big problem for me. Is there a way to change it to lets say 1v like a normal multimeter uses ?
Even 0.5v.
How am i suppose to measure 1.8v low resistance circuit pushing 2v or even 5v through it ? It screws up the reading.
Basically i need it to use about 1v in 500ohm range and 0.5v above, which i think is what every other meter uses more or less but clearly not 5v
Thanks !
TimFox:
Make your own circuit with a low-voltage cell (1.5 V or so) and a three-resistor "T" circuit that has an open-circuit voltage of <0.5 V.
Measure the voltage with no load and with load connected, using your voltmeter.
The rest is algebra.
tonycstech:
yea simplest solution ever.
very helpful
TimFox:
You want the third resistor (that connects to the device under test) to be roughly the same resistance or higher than the expected resistance of the device for a good result.
Fungus:
If the resistance changes with voltage then it's not really resistance.
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