16
OPERATION PROCEDURE
TOS8870A
Fig.3-2
Flowchart of set the LOWER REFERENCE value
Start of setting
Press START switch.
Set test voltage.
LOWER ON/OFF : ON
LOWER REF. : Turn clokwise gradually.
FAIL
judgement
Turn LOWER REF control slightly
counterclokwise.
Press START switch.
Press STOP Switch.
Disconnect divice undet test from test
leadwires.
Press START switch.
End of setting
LOWER ON/OFF : OFF
Test without low limit judgement.
No FAIL judgement even
when LOWER REF control
is turned fully clokwise.
Stop if FAIL
judgement is made.
NO
YES
YES
NO
YES
NO
Be extremely careful when
handling the test leadwires
which are subject to a
hazardously high voltage.
Low limit judgement is unavailable
when the leakage current of the DUT is
smaller than the minimum detectable
current of the Tester or when the current
which flows in the stray cappacitances
of the test leadwires and other device
test of the test setup is larger than low
limit reference value
0 1/2 1
Distribution of DUT
Leakage current
Within
this range.
UPP
ER
FAIL
FAIL
PASS
0 1/2 1
Distribution of DUT
Leakage current
UPPER
LOWE
R
FAIL
FAIL
PASS
LOWE
R
LOWE
R
0 1
Distribution of DUT
Leakage current
UPPE
R
FAIL
FAIL
PASS
LOWE
R
Imperfect contacting
and other failures
For leakage current, the value set by
the CUTOFF CURRENT switches is
assumed to be the reference (value 1).
UPPER
LOWER
:High limit reference value of leakage current for withstanding voltage test.
:Low limit reference value of leakage current for withstanding voltage test.
Press STOP switch.
FAIL
judgement
FAIL
judgement
