7-30
TOS9213S/ TOS9213AS
IR:GND (I:GND)
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 kno
w
n
w
hether a DUT or jig is gro
u
nded, ne
v
er select GUARD. If
GUARD is selected
w
ith a DUT gro
u
nded, the ammeter is short-circ
u
ited,
disa
b
ling meas
u
rement and posing gra
v
e danger. See Fig. 7-5 (B).
•
W
hen GUARD is selected, do not connect the tester to de
v
ices gro
u
nded
on a single side, s
u
ch as Kik
u
s
u
i’s high-
v
oltage digital
v
oltmeter 149-10A
or c
u
rrent cali
b
rator TOS1200. Other
w
ise, the ammeter
w
ill
b
e short-cir-
c
u
ited. See Fig. 7-5 (A).
(A) Connecting the 149-10A
(B) Selecting GUARD
w
hen the DUT is gro
u
nded
Fig.7-5
Dangero
u
s connections
•
W
hen the tester’s LO
W
terminal is connected to the HIGH or LO
W
termi-
nal on the earth contin
u
ity tester TOS6200, the ammeter
w
ill s
u
ffer mea-
s
u
rement errors if GUARD is selected, as the resistor in the TOS6200 is
connected in parallel
w
ith the tester’s ammeter. To
u
se the TOS6200,
either do not connect one terminal to another, or set the LO
W
terminal to
LO
W
.
WARNING
Setting to GUARD
Ammeter
TOS9213S
TOS9213AS
149-10A
HIGH VOLTAGE terminal
LOW
terminal
D
U
T
Insulation
resistance of
the test lead
wire and jig
Setting to GUARD
Ammeter
TOS9213S
TOS9213AS
HIGH VOLTAGE terminal
LOW
terminal
D
U
T
CAUTION
