26
TOS7200
Turning the Judgment Function On and Off
The lower limit (LOWER) and upper limit (UPPER) are used to make pass/fail judgment on the
DUT. You can set the lower and upper judgment functions separately. If both judgment
functions are ON, they function as a window comparator.
Turning the lower judgment function on and off
When the lower judgment is set to ON, if the resistance value falls below the lower resistance”,
the tester makes a FAIL judgment and ends the test.
Setting the lower judgment to OFF causes the tester not to return a FAIL judgment, even if the
insulation resistance falls below the lower resistance.
You can turn on or off the lower judgment function with judgment mode (LOWER ON)
in
the system settings.
1
With the SHIFT key held down, press the VOLT key to enter the system setting.
This causes the leftmost digit of the voltmeter (digit indicated as DOUBLE
ACTION) to blink, indicating that the cursor is positioned at this digit.
2
Press the or key to move the cursor to the LOWER ON position.
3
With the SHIFT key held down, press the or key to change the setting.
The display shows 0 when the lower judgment function is off and 1 when it is on.
4
Press the STOP switch to exit the system setting.
MEMORY
VOLTAGE
RESISTANCE
TIMER
MEMORY
VOLTAGE
RESISTANCE
TIMER
Resistance meter
UPPER/LOWER key
LOWER LED
UPPER LED
UPPER ON LED
For moving the cursor or
changing a numerical value
If the upper or lower judgment function is OFF, no FAIL judgment is made. However, if the timer
is on, a PASS judgment will be made after the test time elapses, so you need to be careful.
• To measure the resistance value despite the fact that it causes a drop in the test voltage, use
a tester with the lower judgment set to OFF. In such a case, if the output voltage exceeds the
range of ±(2 % of s 2 V), the measured voltage value displayed on the voltmeter
blinks, notifying the operator of a drop in the test voltage.
• A lower judgment cannot be made until the wait time has elapsed since the start of a test.
