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Keysight RP7900 Serie Guide D'utilisation Et D'entretien page 151

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Output-On Sequence
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 voltage to the DUT voltage.
In current priority, the power supply also matches its 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.
If an SD1000A unit is connected, the unit's internal delay offset is significantly longer. This is due to
the closure and settling times of the sense and power relays of the SDS. If an abnormal voltage is
detected, the relays remain open and a error is generated.
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 an SD1000A unit is connected, its sense and power relays are also opened.
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.
Also, Models RP795xA and RP796xA use a 1 MΩ resistance, and the SD1000A uses a
25 kΩ resistance for Option 500 and a 97.5 kΩ resistance for Option 950 to
downprogram any voltage from the DUT.
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.
If an SD1000A unit is connected, its output and sense relays are hot-switched open.
Keysight RP7900 Series Operating and Service Guide
4 Using the Regenerative Power System
151

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