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DESCRIPTION OF FRONT AND REAR PANEL ITEMS
TOS8870A
[6]
RANGE 500V/1000V
The switches select a test voltage for insulation resistance test.
[7]
RANGE 2.5kV/5kV
The switches select either the 2.5 kV or 5 kV range for withstanding voltage test. The switches are
linked to the output voltmeter to change its ranges.
[8]
CUTOFF CURRENT (mA)
The switches select a high limit reference value (UPPER REFERENCE value) of leakage current
for withstanding voltage test. The switch values are 0.5, 1, 2, 4, 8, 10 and 100 mA.
By pressing one or more of these switches, values are selectable for a range of 0.5 mA to 25.5 mA
in 0.5 mA steps. When two or more switches are pressed, the ADD lamp illuminates to indicate
that the set current is the sum of those selected by two or more switches.
If the setting is 108 mA or higher, PROTECTION results.
At the instant the leakage current of the DUT has exceeded the set high limit reference value, a
FAIL judgement is mode and the output is cutoff and a FAIL alarm is generated. Set the high limit
reference value as you may require for the DUT.
[9]
LOWER ON/OFF
The Tester is able to make a FAIL judgement also when the leakage current is less than the low limit
reference value (LOWER REFERENCE value), as well as when the leakage current is more than
the high limit reference value. The LOWER ON/OFF switch enables or disables this function.
[10] LOWER REFERENCE
The potentiometer is used to set the low limit reference value for withstanding voltage test
(LOWER REFERENCE value). The adjustable range is from zero to one-half of the high limit ref-
erence value set by the CUTOFF CURRENT switches.
The fully clockwise position of the potentiometer is for one-half of the high limit reference value.
[11] REMOTE
When the TEST/RESET operation of the Tester is remote controlled, the connector is used to con-
nect the control signal of the Remote Control Box (RC01-TOS or RC02-TOS) or other devices.
Be sure to read "3.5 Remote Control" on page 21 before remote-controlling the Tester.
[12] OUTPUT LOW
The ground line of the test voltage. Electrically, the line is connected to the Tester chassis.
[13] DANGER
The lamp (red) indicates that the test voltage is ready to be delivered to the output terminal or that it
is being delivered.
[14] FUNCTION
When in the automatic test mode, the switches are used to set the order of withstanding voltage test
and insulation resistance test. When in the single test mode, the switches are used to select either
one of the two types of tests.
When in the automatic test mode, the test period is as preset by the timer. When in the single test
mode, use or unuse of the timer is selectable by the TIMER ON/OFF switch located in the right
hand side.
