5-42
TOS9213S/ TOS9213AS
Insulation resistance testing
If the upper judgement function is on, the test ends with a FAIL judgement when a
resistance larger than the upper reference is detected. The power is then cut off.
If the lower judgement function is on, the test ends with a FAIL judgement when the
tester detects a resistance smaller than the lower reference. The power is then cut
off.
Using a lower and upper judgement, “
↓
FAIL” and “
↑
FAIL” appear, respectively,
at the top right of the LCD. At the same time, the FAIL LED lights up on the indica-
tor and a buzzer sounds.
To cancel the FAIL judgement, press the STOP switch (the FAIL judgement is out-
put until the STOP switch is pressed).
The measurement results are displayed until the STOP switch is pressed.
The FAIL judgement other than that described above is a CONTACT FAIL (“
→←
FAIL”) judgement that is made when the contact failure is detected while a scanner
is used.
• In insulation resistance testing, an upper judgement is not made during a voltage
rise time (RISE TIME).
• In insulation resistance testing, a lower judgement is not made until the WAIT
TIME has elapsed to eliminate the effects of a charge current in capacitive DUTs.
Fig.5-14 Timing chart for the FAIL j
u
dgement
DC
W
IR
NOTE
START
HV ON
TEST
FAIL
STOP
READY
Output
voltage
START
HV ON
TEST
FAIL
STOP
READY
Output
voltage
