Kikusui TOS6200A, User Manual, Page: 72 / 154

4-38 Basic Operation TOS6200A/6210
4.10.2 Overheating Protection (OVER HEAT)
If the tester's internal temperature rises to unusual levels due to a blocked air intake
or exhaust port, broken fan, use in hot conditions, or other reasons, the overheating
protection function is tripped and an "OVER HEAT" indication blinked on the LCD.
Internal temperatures will fall to normal levels in approximately 10 minutes if no
parts are failure. Once temperatures return to normal, press the STOP switch to can-
cel overheating protection.
If the overheating protection function is set off frequently, the fan or some other unit
component may be failure.
4.10.3 Overload Protection (OVER LOAD)
This protective function limits output power. Even for settings for which the prod-
uct of the test current and upper reference value (including offset value) is 5.4 V or
less and a test can be performed, the overload protection function is tripped if the
output power exceeds the following maximum rated output during testing. This
causes the "OVER LOAD" indication to blink on the LCD.
TOS6200A: 150 VA
TOS6210: 220 VA
For example, when the test current of TOS6200A is 30 A, if the load resistance
(including the resistance of the DUT, the test leads, and any other associated items)
from the perspective of the output terminals exceeds 0.166

(

150/30
2
), the output
power exceeds 150 VA, causing an overload. This disables testing.
Similarly, if the test current exceeds 27.7 A (

150/5.4), an overload may occur, dis-
abling testing.
The test current and resistance to be measured should fall within the power limita-
tions.
Press the STOP switch to cancel overload protection.
CURRENT LOWER UPPER TIMER
25.0
A
0.100 999
s
MAIN MAIN
FREQ LOWER OFF OFFSET OFF TIMER OFF
50Hz
UPPER
OVER HEAT
CURRENT LOWER UPPER TIMER
30.0
A
0.170 60.0
s
MAIN MAIN
FREQ LOWER OFF OFFSET OFF TIMER ON
50Hz
UPPER
OVER LOAD