How can the direct current file's (DCA) quality be assessed?
If there is a known current source, input it directly in the current range. If not, it doesn’t matter. Just input the voltage in the current range. If it is 1, switch to a lower range until the effective value appears. , also note the following:
A. Please do not input too high voltage, so as not to damage the instrument due to too much current. Commonly used sources that can be input are ordinary batteries, such as No. 5 and No. 7;
B. When measuring the current of the input voltage, because the resistance (load) of the internal resistance of the instrument is very small, if the input is too long, the source will be damaged, so try not to exceed 5 seconds for a single input;
C. Each high and low range, and adjacent ranges, generally have a relationship of 10 times.
How to judge whether the capacitor file (CAP) is good or not?
Generally, find a capacitor with a known value and insert it directly for measurement. The displayed value of each range should be in a 10-fold ratio; it is best to use a good metal capacitor for detection, which has stable capacity and high precision. It is not recommended to use electrolytic capacitors for inspection, because the stability and accuracy of electrolytic capacitors are poor.
How to judge whether the resistance file (OHM Ω) is good or bad?
Note, please do not use the resistance file to measure the voltage. When measuring online, the equipment should be powered off, and the line with capacitors or batteries should be fully discharged before measurement. This is easier to detect, generally engaged in electronic maintenance, there are some resistance elements on hand, just measure the resistance value directly.
How to judge (detect) the AC voltage range (ACV) of the multimeter is good?
Household detection sources include AC adapters, household sockets (two-phase 220V, it is best not to measure three-phase 380V, because this voltage is more dangerous, and it is harmful to the instrument (at least a multimeter above CAT III 600V) and the user. For safety reasons, it is recommended to measure a relatively small voltage first, such as an AC adapter, and then measure the voltage of a household socket. For specific safe operation methods, please refer to the product manual.
