38 PRODIGIT
Note 1: The message OCP ERROR will be displayed if the DUT fails the test.
The reasons for failure are due to one of the following conditions:
(a) the voltage level of the DUT falls below the set voltage threshold
(OCP Vth) during the test
(b) The current taken from the DUT reaches the OCP I STOP setting.
Note 2: The message PASS will be displayed if the DUTs voltage stays above
The set threshold. Also to PASS the OCP test the current taken from the
DUT cannot equal the I STOP setting.
Note 3: If the DUT passes the OCP test the maximum current taken during the
Test is displayed on the lower LCD.
Upon PASS or OCP ERROR the test will automatically stop. The red
START/STOP button can be used during the test to immediately cease operation.
3.2.19. key
The OPP key allows the parameters of an Over Power Protection test to be
entered. The OPP test will ramp up the load power in steps to validate the
Device under Test’s (DUT) protection and behavior. A voltage threshold level
can be set. If the voltage measured during the test is lower than the set
Threshold voltage then the test will fail and the display will signal OPP ERROR.
Similarly a power threshold (P STOP) can be set. If the measured power
reaches the P STOP threshold the test will be discontinued and the OPP
ERROR message will be displayed.
Pressing the OPP key once will cause the button to illuminate. The message
“OPP PRESS START” will be shown across the 3 displays.
Each press of the OPP button moves the menu on one step. The upper and
Middle LCDs show the currently selected test parameter as text. The value is
adjusted by the rotary knob and can be read from the lower display during
Setting.
The setting sequence is shown below:
OPP PRESS START (pressing the red start/stop key starts test)
OPP P STAR (power starting point of the OPP test)
OPP P STEP (value of incremental current steps from P START)
OPP P STOP (the OPP test’s upper threshold power limit)
OPP Vth (the voltage threshold setting)
Exit OPP test set-up
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