Kikusui TOS5050A - Wattage, Heat, and Other Limiting Conditions of Use

3-8 TOS5051A/5050A
3.8 Wattage, Heat, and Other Limiting
Conditions of Use
■ Use at a voltage less than or equal to 5 kV
The maximum output voltage of the tester when there is no load may be higher than
5 kV. It may be even higher depending on AC line voltage fluctuation. Be sure to
operate the tester at an output voltage less than or equal to 5 kV.
■ Provide time for the tester to pause
During an AC test
The heat dissipation of the high voltage transformer of the AC test section is one-
half of the normal wattage with respect to the rated output from the viewpoint of
size, weight, and cost of the tester. When operating the tester with its UPPER CUT-
OFF CURRENT higher than 50 mA, provide pause periods at least identical with
test periods. The maximum allowable continuous test period is 30 minutes (at ambi-
ent temperature not higher than 40 ˚C. If this limit is exceeded, the thermal fuse in
the high voltage transformer may blow out.
The information below does not apply when the CUTOFF CURRENT is less than
50 mA.
Table 3-2 Conditions for maximum continuous test period (AC mode)
During a DC test (TOS5051A only)
The heat dissipation of the high voltage generator of the DC test section is one-tenth
of the normal wattage with respect to the rated output from the viewpoint of size,
weight, and cost of the tester. When operating the tester, provide pause periods
shown in the tables below. If you operate the tester beyond these limits, the high
voltage generator will be overheated and the protector may trip and the tester may
be driven into the PROTECTION status (“PROTECTION” is lit). If this happens,
pause the test operation until the tester cools off and then resume the test operation.
As the tester is cooled off and the cause of the PROTECTION status is eliminated,
the tester resumes its normal operating state.
Ambient temperature
t (°C)
Upper cutoff current
I (mA)
Pause period
Maximum allowable
continuous test period
t ≤ 40°C 50 < I ≤ 110
Not less than
test periods
≤ 30 min
I ≤ 50 Not required Continuous