LCR40 User Guide November 2021 – Rev 7
Page 10
Large Capacitors
Capacitors larger than about 1μF are treated differently, instead of being tested
with an AC signal, they are tested with a DC signal. This is confirmed in the
“Test frequency” screen.
Please be patient when testing large value capacitors, it may take several
seconds depending on the capacitance.
Capacitors (particularly electrolytics) can store enough charge that
may cause damage to the LCR40.
An electrolytic capacitor can even develop its own stored charge that may
be sufficient to cause damage to the LCR40 even after it has been
temporarily discharged. This is a characteristic known as dielectric
absorption or “Soakage”.
It is vitally important that you ensure the capacitor is fully discharged
(ideally for several seconds) to minimise the possibility of damage to the
unit.
If you are unsure, measure the voltage across the capacitor using a
suitable volt meter before applying the capacitor to the LCR40.
Generally, tantalum capacitors and electrolytic capacitors are
polarised. The LCR40, however, uses a maximum of 1V to test the
capacitor and so polarity of the LCR40 test probes is usually
unimportant.
Test frequency
DC
Capacitance
106.5uF
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