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■ LOW
In the LOW mode, the current which flows through the LOW terminal by insulation
resistance of the test leadwire and jigs is included in the measurements, as shown in
Fig. 5-3 (A) and (B). However, the ammeter is protected from short-circuiting,
thereby ensuring safe testing regardless of whether the DUT is grounded. For this
reason, it is recommended that LOW be set in ordinary tests.
TOS9213S/ TOS9213AS
HIGH VOLTAGE terminal
Ammeter
LOW
terminal
TOS9213S
TOS9213AS
Setting to LOW
(A) DUT grounded
HIGH VOLTAGE terminal
Ammeter
LOW
terminal
TOS9213S
TOS9213AS
Setting to LOW
(B) DUT not grounded
Fig.5-3 Selecting LOW
Insulation
resistance of test
lead wire and jigs
D
U
T
Insulation
resistance of test
lead wire and jigs
D
U
T
5-15
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