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ESR70 User Guide
Appendix A - Troubleshooting
Problem
ESR value when probes
are shorted is not close
to 0Ω
Display shows
Removing trace
charge
Display shows
Auto discharge
taking too long!
Display shows
Warning! V=132V
Safely discharge
Display shows
Self Test Fail
Code 2
Display shows
In-Circuit/Leaky
even though it is a new
capacitor and out-of-
circuit.
Cause / Possible Solution
Perform a probe compensation.
This message is displayed if the ESR70 has
detected that the attached capacitor may be
exhibiting "Soakage" or "Dielectric
Absorption", this is quite normal. The
instrument then ensures that the capacitor is
very well discharged and helps to prevent
voltage developing across the capacitor after
the normal discharge procedure has
The unit attempts to remove charge from the
capacitor using a controlled discharge
procedure. If this takes longer than 60 seconds
then the discharge process will be aborted. It
is recommended that you safely discharge the
capacitor manually and try analysis again.
If the voltage across the capacitor is greater
than 50V then the ESR70 will not attempt to
discharge the capacitor, please safely
discharge the capacitor manually.
It is possible that a hardware failure has
occurred, please contact Peak Electronic
Design Limited for assistance.
The ESR70 will display "In-Circuit/Leaky" if
the charge curve is non-linear by more than
10%. Some capacitors (even new ones) can
exhibit a non-linear charge characteristic and
means that the capacitance cannot be reliably
measured. "Exercising" the capacitor can help,
so try to measure it again a few times.
Page 14
November 2021 – Rev 14
completed.
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