Hioki 3511-50, Instruction Manual, Page: 51 / 140

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4.7 The Residual Charge Protection Function
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CAUTION
The quoted maximum voltage from which the unit can be protected by
this function is for reference purposes only, and is not a guaranteed
value. There may be danger of damage to the 3511-50 unit,
depending upon the operational circumstances and upon how often
such charged capacitors are connected. In general, you should not
rely upon this protection function; be sure to discharge charged
capacitors properly before connecting them to the test terminals.
The residual charge protection function is for protection of the 3511-
50 unit against the discharge of voltage present in charged capacitors,
and is not capable of protecting the unit against DC voltage which is
constantly applied such as a superimposed DC voltage. (The
maximum voltage for supply to the test terminals of the 3511-50 unit
is 40 VDC.) If this is done, there is a danger of damage to the unit.
(For how to supply a DC bias voltage, refer to Section 5.2, "Supplying
DC Bias".)
4.7 The Residual Charge Protection Function
The 3511-50 has been enhanced by the incorporation of a residual charge
protection function. If by mistake a charged capacitor is connected to the
test terminals, this function protects the internal circuitry of the unit from
discharge of such residual charge.
The maximum voltage from which the unit can be protected by this function
is determined from the capacitance value of the sample under test by the
following equation:
V: Voltage (volts) (maximum 400 VDC)
C: Capacitance (farads)