What resistance is the center of your ohm scales, Rx1 range?
hi hi
50
the lowest
On an analog ohmmeter, measurements are more precise and more accurate at the zero end of the scale.
1). Assure a fresh battery in the meter. (A digital ohmmeter with a low battery will often display a reading as if it's the honest truth, when it's actually a completely bogus measurement.) 2). Use the smallest scale possible, i.e. the lowest scale that's larger than the resistance under test.
Because the meter is actually measuring the current through the resistor, and the two quantities ... current and resistance ... are inversely proportional. So when the meter measures more current, it has to read less resistance, whereas higher resistance will result in less current. So the numbers for resistance have to be printed "backwards" on the meter scale.
50
A: The only calibration that a potentiometer is allow to do is on the resistance scale. The reason being is the internal battery looses capability with age so to compensate the pot. will change current available to make the ohmmeter to go to zero when the probes are shorted. To test a volts range then an accurate voltage must be used to verify calibration.
If you put a current of 1 amp through a resistor, the voltage across it is equal to the resistance in ohms. This can also be done with lower currents and then the result must be multiplied up in the right ratio. An ohmmeter, or the ohm scale on a multimeter, uses a battery to supply the current.
Resistance is measured in ohms, so some refer to the resistance scale as the ohms scale.
By Ohm's law, resistance is voltage divided by current, so you can determine the resistance of a voltmeter by measuring the total current required to drive it to full scale on each range. In typical digital voltmeters, the resistance is fixed at 11 or 20 megohms by a resistor divider. This is not often affected by range, because the op-amp that picks up the divided signal contributes negligible resistance to the divider. In typical analog voltmeters, the resistance is a function of the resistance selected by the range that is placed in series with the meter movement. An example, for a 50 microampere movement is typically 20,000 ohms per volt, so you simply multiply the selected full scale range by 20,000 to get the resistance.
probably overload. which means whatever is being measured is beyond the range of the current scale.
Answer: At the zero end, the measurement is more reliable, because all materials have some conductivity, so even the plastic grip of a meters probe, with both your hands making contact with both the probes, will give you some reading at infinity side of the scale.