Extech Instruments EX650 User Manual page 24

Capacitance Measurement Notes:
 The display will show "OL" if a capacitor is short‐circuited or if the measured capacitance >
maximum range of the instrument.
 The bargraph is not active in the capacitance measurement mode.
 Capacitance measurements > 600μF may require several seconds to obtain a stable
reading.
 In order to ensure measurement accuracy, discharge residual charges before measuring
capacitance; Use maximum safety when working with high voltage capacitors to prevent
damage to the instrument and risk to personal safety.
 Disconnect test leads and circuit under test after measurements are completed.
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