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Its just occurred to me that the readings all appear to be some 10% lower than they should be.
2)Its just occurred to me that the readings all appear to be some 10% lower than they should be.
3) But the picture shows 0.2 Ohms, which is 10% lower than 0.22 Ohms.....(current in the 0R22 is always
The current in the 0R22 resistor is half sine "humps" at 10ms period
Thanks, i thought some of the cheap meters, due to their inclusion of protection circuitry to protect against connection to overly high voltages, end up with much lower input impedance.Like others, I expect 10 M input resistance. But it's easy to measure, isn't it?
Only analog meters. The way digital ones work means the input impedance is fairly constant across all ranges and is usually at least 10M on DC and usually AC ranges.I think the cheap meters are only meant for measuring low impedance source voltages such as batteries or outputs of power supplies etc, so suspect their Zin will be low, because its cheaper to make them so(?)
Only analog meters. The way digital ones work means the input impedance is fairly constant across all ranges and is usually at least 10M on DC and usually AC ranges.
Brian.
Why dont you just take two known resistors, make a voltage divider, and verify that your crappy $9 meter is working properly?
What do you mean by "known resistors" ?
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