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Setting LOW/GUARD for the GND
5-30
IR2
IR2
RISE
: 0.1s(−−−V/s)
DISCH : 0.0s
WAIT
: 0.3s
GND
F1
F2
F3
You can select either of the following two measurement modes;
the LOW mode that the GND is connected to the tester's LOW terminal,
the GUARD mode that the GND is used as guard.
In both modes, the tester detects the current flowing into the LOW terminal from the
HIGH VOLTAGE terminal via the DUT. In the LOW mode, the LOW terminal is
connected to the chassis. This leads to the problem of the insulation resistance
between the test leadwire and jigs and the earth being included in the measurement.
Nonetheless, the GND mode ensures safe testing, as it does not short-circuit the
ammeter.
In the GUARD mode, on the other hand, only the current flowing into the LOW ter-
minal from the HIGH VOLTAGE terminal via the DUT is measured, while the
influence of the insulation resistance between the test leadwire and jigs and the earth
is eliminated. For this reason, the GUARD mode is effective in measurements that
require high sensitivity and high accuracy. At the same time, however, the ammeter
can be short-circuited, posing a grave danger if the LOW terminal and the chassis
are short-circuited when part of the DUT is connected to the earth ground. If it is not
known whether the DUTs and jigs are grounded, select the LOW mode.
To switch between the two modes, use the SHIFT + F3 keys, regardless of the loca-
tion of the cursor. Each time the SHIFT + F3 keys are pressed, LOW and GUARD
alternate.
Using the
be made using the rotary knob.
Turn the rotary knob clockwise
Turn the rotary knob counterclockwise : LOW
When LOW is selected, the LOW/GUARD LED lights up.
LOW/GUARD
LED lights up
OUTPUT
DANGER
HIGH VOLTAGE
MAX 10kV
TERMINAL
LOW
GND
: LOW
F4
F5
SHIFT
keys, move the cursor to the right of GND; settings can then
: GUARD
TOS9213S/ TOS9213AS
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