24
TOS7200
Setting Limits
Set the limits for making pass/fail judgments on the DUT. There is a lower limit (LOWER) and an
upper limit (UPPER).
Setting a lower resistance (LOWER)
The lower resistance can be set in the range of 0.01 MΩ to 5000 MΩ (provided that the current
is within the maximum rated current).
When the wait time elapses following the start of a test, if an insulation resistance value below
the lower resistance is detected, the tester makes a FAIL judgment and ends the test.
1
Press the UPPER/LOWER key.
This causes the rightmost digit of the resistance meter LED to blink, indicating
that the cursor is positioned at this digit.
2
Check whether the LOWER LED is lit.
If it is, the lower resistance is displayed. If the UPPER LED is lit, the value
displayed is the upper resistance. In such cases, press the UPPER/LOWER key
again to light up the LOWER LED.
3
Press the or key to move the cursor to the digit at which a value is to be set.
4
With the SHIFT key held down, press the or key to change the value.
If necessary, change the value at another digit to achieve the desired lower resistance.
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
Lower Resistance
Resolution
0.01 MΩ to 9.99 MΩ
0.01 MΩ
10.0 MΩ to 99.9 MΩ
0.1 MΩ
100 MΩ to 5000 MΩ
1 MΩ
• When both the upper and lower judgments are activated, setting the lower resistance to a
value higher than the upper resistance causes the UPPER LED to blink, notifying the
operator that a test cannot be conducted. (The lower resistance is set to 1.00 MΩ at factory
shipment.) In such cases, lower the lower resistance or raise the upper resistance.
• When the lower judgment is activated, making settings such that the value obtained by
dividing the test voltage by the lower resistance exceeds 1.1 mA causes the LOWER LED to
blink, notifying the operator that a test cannot be conducted. In such a case, lower the test
voltage or raise the lower resistance.