4-16 TOS5051A/5050A
[23] UPPER message
This message indicates that the ammeter is displaying the upper cutoff current.
Switchover between the upper and lower cutoff currents can be done with the UP/
LOW key when the tester is in the READY status (“READY” is lit) and the “KEY-
LOCK” message is OFF.
When the test is in progress (“TEST” is lit), “UPPER” and “LOWER” messages
disappear, and the ammeter displays the measured current.
[24] LOWER message
This message indicates that the ammeter is displaying the lower cutoff current.
Switchover between the upper and lower cutoff currents can be done with the UP/
LOW key when the tester is in the READY status (“READY” is lit) and the “KEY-
LOCK” message is OFF.
When the test is in progress (“TEST” is lit), “UPPER” and “LOWER” messages
disappear, and the ammeter displays the measured current.
[25] LOWER ON message
This message means that the lower pass/fail judgment function is ON. When the
function is ON, the message appears; when it is OFF, the message disappears.
The function can be turned ON or OFF by pressing the UP/LOW key together with
the SHIFT key when the tester is in the READY status (“READY” is lit) and the
“KEYLOCK” message is OFF. Even when the lower pass/fail is turned OFF and the
“LOWER ON” message is OFF, display and adjustment of the preset cutoff current
can be done.
On the TOS5051A, this test condition setting applies both AC and DC test modes.
[26] Timer
When in the TEST-ON status (“TEST” is lit), the TIME display indicates the
remaining or elapsed test time on a 3-digit 7-segment readout.
The preset test period can be increased/decreased with the or key when the
tester is in the READY status (“READY” is lit) and the “KEYLOCK” message is
OFF. If you press the or keys together with the SHIFT key, the increment/dec-
rement rate is multiplied by a factor of 10.
If the timer function is ON (“TIMER ON” is lit), the displayed period decreases as
test time elapses and the test terminates when the preset test period elapses. If the
timer function is OFF (status that the “TIMER ON” message is OFF), the displayed
period starts by zero and increases as test time elapses—the test does not terminate
even when the preset test period elapses.
On the TOS5051A, the preset test period applies to both AC and DC test modes.
1. Displayed items
Displayed items
When in READY status When in TEST-ON status
“TIMER ON” appears “TIMER ON” disappears
Period displayed Remaining period Elapsed period
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