Hioki IM3536 - Appx. 6 the Residual Charge Protection Function

Appx.9
The Residual Charge Protection Function
Appx. 6 The Residual Charge Protection Function
CAUTION
• The quoted maximum voltage from which the instrument can be protected by this
function is for reference purposes only, and is not a guaranteed value. The instrument
may be damaged depending on operating conditions, for example the frequency at
which charged capacitors are connected and whether a series of charged capacitors
has been 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 instrument against the
discharge of voltage present in charged capacitors, and is not capable of protecting
the instrument against DC voltage which is constantly applied such as a superim-
posed DC voltage. If this is done, there is a danger of damage to the instrument.
See "Appx. 5 Supplying DC Bias" (p. Appx.6).
The residual load protection function, which protects the instrument’s internal circuitry from the
capacitor’s discharge voltage in the event a charged capacitor is inadvertently connected to a mea-
surement terminal, has been enhanced.
The maximum voltage from which the instrument can be protected by this function is determined
from the capacitance value of the sample under test by the following equation:
V =1000 V ( C < 1 µF)
V =√1/ C V (1 µF ≤ C < 6.25 µF)
V =400 V (6.25 µF ≤ C < 62.5 µF)
V =√10/ C V (62.5 µF ≤ C )
C : Capacitance of the measurement sample
[F]
Relationship of capacitance and residual voltage from which the LCR meter can be protected
0
200
400
600
800
1000
1200
0.1 1 10 100 1000
残留電圧（V)
静電容量（μF）
Residual voltage (V)
Capacitance [µF]
10
9
8
7
6
5
4
3
2
1
Appx.
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