Differences of Resistance Measurement Methods
QThere are two types of resistance measurement methods: DC method and AC method. Which should be chosen?
The choice of either DC or AC method is determined by the object to be measured. See the table for each of the advantages and disadvantages.
|DC Resistance Meter||AC Resistance Meter|
|See below Figure 1||See below Figure 2|
|Advantage||High-precision measurement is possible.||
Not affected by EMF.|
Can measure reactance.
Influenced by electromotive force due to lack of DC superimposed measurement.|
(OVC function allows correction of only thermal EMF)
|Difficult to improve accuracy|
|Purpose||DC resistance, contact resistance, and insulation resistance of transformers, motors, and other windings, and wiring resistance of PCBs||Battery impedance, inductor, capacitor, and electrochemical measurements|
|Measuring range||10-8 to 1016 Ω||10-3 to 108 Ω|
|Hioki measuring instruments|| Resistance Meters|
Digital Multimeters, Testers
Insulation Testers(MΩ HiTester）
| Battery Testers|