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The following table documents the output impedance setting for the turn-on and turn-off sequences.
You can specify either Low or High output impedance when operating in Voltage priority mode.
Output turn-on/turn-off impedance for
PV892xA; PV893xA
The following Output-On and Output-Off sequence descriptions are illustrated in the accompanying
flowchart.
Output-On Sequence
The internal power circuits are connected to the output by a solid-state switch. Upon the receipt of an
Output On command, the power supply waits for the duration of the user-programmed turn-on delay.
In voltage priority with LowZ, the power supply programs its internal circuits to a voltage of zero and
sets the current limits to their user-programmed values. In voltage priority with HighZ, the power
supply matches its internal voltage to the DUT voltage.
In current priority, the power supply also matches its internal voltage to the DUT voltage. This ensures
that when a source such as a battery is connected to the output, that there is no current surge into the
power supply from the DUT when the output is turned on.
The power supply's solid-state output switch is then closed, connecting the output to the internal
power circuits. The output voltage and current are programmed to their user-settings. The output
follows the slew rate setting.
Output-Off Sequence
Upon the receipt of an Output Off command, the power supply waits for the duration of the user-
programmed turn-off delay.
In voltage priority with LowZ, the power supply programs the voltage to zero. It then waits up to 250
ms to discharge any current from the DUT. It then programs the current limits to their minimum
settings. In voltage priority with HighZ, the power supply only programs the current limits to their
minimum settings.
In current priority, the power supply programs the current to zero. It then waits up to 250 ms to
discharge any current from the DUT.
The power supply's solid-state output switch is then opened, disconnecting the output from the
internal power circuits.
If you wish to program a voltage turn-off slew rate, you must set the slew rate and
program the output voltage to zero before you send the output off command.
Output-Off Protection Sequence
The turn-off protection sequence differs from the normal turn-off sequence in that it turns off the
output as fast as possible. When a protection event is detected, the power supply immediately opens
the solid-state output switch. This typically takes less than 50 μs following the initial detection.
Keysight PV8900 Series Operating and Service Guide
4 Using the Photovoltaic Array Simulator
Voltage Priority
Impedance is user-selectable via
OUTPut:TMODe
command
Current Priority
High impedance turn-on
High impedance turn-off
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