Keysight Technologies RP7900 Series, Operating And Service Manual

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status bit to the over-current protection delay time. If the over-current persists beyond the sum of
both time intervals, the output will shut down.
Output Watchdog Timer
When enabled, the output watchdog timer causes the output to go into protection mode if there is no
SCPI I/O activity on the remote interfaces (USB, LAN, GPIB) within the user-specified time period. Note
that the watchdog timer function is NOT reset by activity on the front panel – the output will still shut
down after the time period has elapsed.
After the time period has expired, the output will be disabled, but the programmed output state is not
changed. The Prot bit in the status questionable register as well as the Prot indicator on the front
panel will be set. A watchdog protect can be cleared as described under Clear Output Protection
Functions.
The watchdog delay can be programmed from 1 to 3600 seconds in 1-second increments. To enable
the watchdog timer and specify a delay value, proceed as follows:
Front Panel Menu Reference SCPI Command
Select Protect\WDog
Check Enable Watchdog to enable the watchdog
timer.
Enter a value in the Watchdog Delay box. Then press
Select .
To enable the output watchdog timer:
OUTP:PROT:WDOG ON
To set the output watchdog timer to 120 seconds:
OUTP:PROT:WDOG:DEL 120
Set the Under-Voltage Protection
This information applies to models RP793xA and RP794xA only.
The under-voltage protection will turn the output off if the output voltage falls below the programmed
low voltage setting. The voltage circuit monitors the voltage at the + and – sense terminals.
This feature is used when discharging batteries to prevent the battery voltage from dropping below
the low voltage setting.
In voltage priority mode, the output voltage must be at the target value before the under-voltage
protection is enabled to prevent the unit from tripping during output up-programming. A delay can be
set that is longer than the output up-programming time to prevent the protection from tripping during
the voltage transition.
In current priority mode, if the output is turned on with the voltage limit set to a value below the low-
voltage setting, the under-voltage protection will also trip.
The under-voltage protection delay can be programmed from 20.48 microseconds to 2611 seconds in
20.48 microsecond increments. To enable the under-voltage protection and specify a delay value,
proceed as follows:
4 Using the Regenerative Power System
122 Keysight RP7900 Series Operating and Service Guide