Table of Contents
Advertisement
IR:GND (I:GND)
WARNING
CAUTION
7-30
Sets LOW/GUARD of the GND for an insulation resistance test. Also inquires
about the set or setting value of the GND.
• If it is not known whether a DUT or jig is grounded, never select GUARD. If
GUARD is selected with a DUT grounded, the ammeter is short-circuited,
disabling measurement and posing grave danger. See Fig. 7-5 (B).
• When GUARD is selected, do not connect the tester to devices grounded
on a single side, such as Kikusui's high-voltage digital voltmeter 149-10A
or current calibrator TOS1200. Otherwise, the ammeter will be short-cir-
cuited. See Fig. 7-5 (A).
HIGH VOLTAGE terminal
Ammeter
TOS9213S
TOS9213AS
(A) Connecting the 149-10A
HIGH VOLTAGE terminal
Ammeter
TOS9213S
TOS9213AS
(B) Selecting GUARD when the DUT is grounded
Fig.7-5
Dangerous connections
• When the tester's LOW terminal is connected to the HIGH or LOW termi-
nal on the earth continuity tester TOS6200, the ammeter will suffer mea-
surement errors if GUARD is selected, as the resistor in the TOS6200 is
connected in parallel with the tester's ammeter. To use the TOS6200,
either do not connect one terminal to another, or set the LOW terminal to
LOW.
D
U
T
LOW
terminal
Setting to GUARD
D
U
T
LOW
terminal
Setting to GUARD
149-10A
Insulation
resistance of
the test lead
wire and jig
TOS9213S/ TOS9213AS
Advertisement
Table of Contents
