2 Making Measurements
68 Keysight U1251B and U1252B User’s and Service Guide
Measuring Capacitance
The meter measures capacitance by charging the capacitor with a known current
for a period of time, measuring the voltage and then calculating the capacitance.
The larger the capacitor, the longer the charge time. Below are some tips for
measuring capacitance:
– For measuring capacitance values greater than 10,000 μF, discharge the
capacitor first, then select a suitable range for the measurement. This will
speed up measuring time in order to obtain the correct capacitance value.
– For measuring smaller capacitance values, press with the test leads
open to subtract any residual capacitance from the meter or the leads.
Set up the multimeter as shown in Figure 2-12. Use the red probe lead on the
positive terminal of the capacitor and the black probe lead on the negative
terminal and read the display.
CAUTION
Disconnect the circuit power and discharge all the high-voltage capacitors
before measuring the capacitance to prevent any possible damage to the
meter or the device under test. To confirm that the capacitors have
discharged, use the DC voltage function.
NOTE
means the capacitor is charging. means the capacitor is discharging.
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