Making Measurements 2
Agilent U1251A/U1252A User’s and Service Guide 51
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. Larger the
capacitors, longer the charging time.
Measuring tips:
• For measuring capacitances greater than 10,000μF,
discharge the capacitor first, then select a suitable
range for measurement. This will speed up measuring
time in order to obtain the correct capacitance value.
• For measuring small capacitances, push with the
test leads open to subtract the residual capacitance of
the meter and leads.
1 Set the rotary switch to .
2 Connect the red and black test leads to input terminals
and COM respectively.
3 Use the red probe lead on the positive terminal of the
capacitor while the black probe lead on the negative
terminal.
4 Read the display.
CAUTION
Disconnect circuit power and discharge all high-voltage capacitors before
measuring capacitance to prevent possible damage to the meter or the
device under test. To confirm that capacitors have discharged, use the DC
voltage function.
NOTE
means capacitor is charging. means capacitor is discharging.
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