33501 Series Operation Manual 3-9
setting range is 0.00W to the full scale of the CP mode specification. The
setting is by rotating the setting knob.
3.1.18.6 Vth : Setting threshold voltage; The LCD display shows “OPP”, “Vth” and
0.50VI(initial) from upper to lower 5 digits LCD display, the setting range is
0.00V to the full scale of the Voltage specification. The setting is by rotating
the setting knob.
3.1.18.7 START/STOP Test key.
Press START/STOP key to start or stop the OPP test by OPP test setting
parameter when OPP test function is enabled.
The Load will goes to “ON” automatically when press START/STOP key to
start the OPP test and the Load will goes to “OFF” automatically when
press START/STOP key to stop the OPP test. The Load will stay to “ON” If
load was “ON” before OPP test.
The OPP test function for test the UUT’s over power protection, The OPP
test will start sink current from PSTART to increase PSTEP current until
the UUT’s output voltage drop-out lower than the threshold voltage(V-th
setting), and the OPP trip point is between P_Hi and P_Lo limitation, then
lower 5 digits LCD display will shows "PASS", otherwise shows "FAIL".
Press any key to goes to normal mode of LCD display.
3.1.19 OCP key and LED
3.1.19.1 OCP test function Enable/Disable Key.
Press “ OCP” key to enable the OCP test function and the indicator LED is
lit on. The LCD display show “OCP” on upper 5 digits LCD display, shows
“PRESS” on middle 5 digits LCD display and shows “START” on lower 5
digits LCD display.
3.1.19.2 OCP test function parameter setting key.
There are 4 parameter for the OCP test function. The parameter as ISTAR,
ISTEP, ISTOP and Vth.
Press “OCP” key again to set OCP test parameter ISTAR(start current
point) When OCP test function is enabled. Press OCP key again to next
parameter by the sequence of ISTEP, ISTOP, Vth and disable, press
another key also can to exit the setting and save the setting. The OCP test
parameter description as following.
3.1.19.3 ISTAR : setting the start current point, The LCD display shows “OCP”,
“ISTAR” and 0.000AI(initial) from upper to lower 5 digits LCD display, the
setting range is 0.000A to the full scale of the CC mode specification. The
setting is by rotating the setting knob.
3.1.19.4 ISTEP : setting the increment step current point, The LCD display shows
“OCP”, “ISTEP” and 0.000AI(initial) from upper to lower 5 digits LCD
display, the setting range is 0.000A to the full scale of the CC mode
specification. The setting is by rotating the setting knob.
3.1.19.5 ISTOP : setting the stop current point, The LCD display shows “OCP”,
“ISTOP” and 240.0AI(33501 initial) from upper to lower 5 digits LCD
display, the setting range is 0.000A to the full scale of the CC mode
specification. The setting is by rotating the setting knob.
3.1.19.6 Vth : Setting threshold voltage; The LCD display shows “OCP”, “Vth” and
0.50VI(initial) from upper to lower 5 digits LCD display, the setting range is
