Kikusui TOS9200, Operation Manual

Page: 45 / 172

TOS9200/9201 Basic Operations 3-7
Setting the lower current (LOWER)
The lower current can be set between 0.01 mA and 110 mA (at a resolution of 0.01
mA for 0.01 mA to 9.99 mA, 0.1 mA for 10.0 mA to 99.9 mA, and 1 mA for 100
mA to 110 mA).
When the cursor is at the lower current, the rotary knob can be used to make set-
tings. When the lower judgement function is set to ON and the measured current is
at or below the lower current, the test ends with a FAIL judgement.
When the
fl uctuations of the leakage current of the DUT are limited and exceed the
current by a suf fi cient amount to permit the tester to make a judgement, set the
lower current below the smallest fl uctuation. By making such a setting, it is possible
to identify a DUT that generates a small leakage current and even detect disconnec-
tion and failed contact in the test leadwire, ensuring an accurate withstanding volt-
age test. If the lower judgement function is not to be used, turn it off.
1. To display the lower current, press the F2 key (LOWER). While the
lower current is displayed, the cursor can be moved using the
keys.
2. Using the keys, move the cursor to the target digit.
3. Using the rotary knob, set the lower current.
• If the lower current is set at or above the upper current while the lower judgement
function is on, “READY” disappears and “UP<=LOW” fl ickers at the top right of
the LCD to indicate that testing cannot be performed (the lower current is factory-
set to 0.10 mA).
Lower the lower current or raise the upper current.
The invalid settings shown above have the priority speci
fi ed in "3.15 Invalid Set-
tings". When there are two or more invalid settings, messages with higher prior-
ity may be displayed
fi rst.
• As described in "Chapter 8 Speci fi cations", in a high-sensitivity and high-voltage
test using an alternating current, a current larger than the lower current may fl ow
into the stray capacity of the test leadwire and other components, making it
impossible to conduct lower judgement. No current fl ows into a DUT if it is not
connected to the tester. Thus, the current fl owing into the DUT is smaller than the
lower current. The test may then be judged as FAIL. Nonetheless, if a current
larger than the lower current fl ows into the stray capacity, the current detection
circuit detects the current and makes a PASS judgement. Carefully check com-
bined judgement errors. In addition, disconnect the DUT under preset test condi-
tions and con
fi rm that a FAIL judgement is possible.
• No lower judgement is made while the voltage is rising or falling.
VOLT LOWER UPPER TIMER
1.00
kV
0.1
mA
3.0
s
ACW1 ACW1
FREQ LOWER ON OFFSET OFF TIMER OFF
READY
LOWER
50Hz
F1 F2 F3 F4 F5
SHIFT
NOTE