How can I tell (test) that the AC voltage setting (ACV) of a multimeter is good?
Household testing sources, AC adapter, household outlets (two-phase 220V kind, it is best not to measure the three-phase 380V kind, because this voltage is more dangerous to the instrument (at least CAT III 600V or more multimeter) and the use of people are demanding), for safety reasons, it is recommended that the first measurement of a smaller voltage, such as AC adapter, and then measure the voltage of the household socket, the specific safety! Please refer to the product manual for details of the operation method.
How to judge the resistance gear (OHM Ω) good or bad?
Note, please do not use the resistance file to measure the voltage, online measurement, the equipment should be disconnected, there are capacitors or batteries in the line, it should also be fully discharged before measurement. This is a better test, generally engaged in electronic maintenance, there are some resistance components on hand, direct measurement of resistance can be.
How to judge the good and bad of the DC current gear (DCA)?
If there is a known current source, directly in the current file input, if not, it does not matter, just input voltage in the current file, if the words out of 1, to the lower range gear to dial a notch, until the effective value appears, please note the following points:
A, please do not input too high a voltage, so as not to current is too large, and damage to the instrument, commonly used can be input source of ordinary batteries, such as No. 5, No. 7 and so on;
B, in the input voltage to see the measurement of its current, because the instrument resistance (load) is very small, the input is too long, if there is damage to the source, so a single input try not to exceed 5 seconds;
C, each high and low ranges, adjacent ranges, generally 10 times the relationship.
How to judge the capacitance file (CAP) good or bad?
Generally find a known value of capacitance, directly inserted into the measurement, the range display value should be 10 times than the relationship; detection is best to use a good metal goods capacitor, its capacity is stable, high precision. It is not recommended to use electrolytic capacitors to test, because electrolytic capacitors are less stable and less accurate.
