Measure capacitance with the voltage and the frequency specified in the product specifications.
Example of measuring conditions of capacitance
|Class||Rated capacitance||Measuring frequency||Measuring voltage
|Class 1||CN ≦1000pF||1 MHz ±10%||0.5 ～ 5.0|
|CN >1000pF||1 kHz±10%|
|Class 2||CN≦10mF||1 kHz±10%||1.0 ± 0.2|
|CN > 10mF||120Hz±10%||0.5 ± 0.2|
Class 1 : Temperature compensating capacitor (COG, NPO)
Class 2 : High dielectric constant capacitor (X5R, X7R, Y5V)
Some measuring equipment may not be able to apply the required measuring voltage and the measured value will be underestimated, when capacitance is high.
Measuring equipment with Auto Level Control (ALC) function is recommended.
Since higher capacitance makes smaller impedance in capacitors, it shall not disregard the influence of the
voltage drop by voltage divider with the output resistance of measuring equipment.
The measuring equipment, which has the function to adjust to the measuring voltage automatically, is recommended for the measurement of a high capacitance capacitor.
And, when the measuring equipment without the ALC function is used, it is recommended to check and adjust the measuring voltage by a voltmeter.