Watchdog Timer Protection
The watchdog timer, when enabled, causes all outputs 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 or when using the Web server –
the outputs will still shut down after the time period has elapsed..
After the time period has expired, the outputs 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.
The watchdog delay can be programmed from 1 to 3600 seconds in 1 second increments. As shipped
from the factory, the watchdog timer is set to disable the outputs 60 seconds after all IO activity has
ceased.
The watchdog state and delay settings are volatile, but can be saved and recalled as part of the
instrument state. A watchdog protect can be cleared as described under Clear Output Protection.
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 watchdog timer:
OUTP:PROT:WDOG ON
To set the watchdog timer to 600 seconds:
OUTP:PROT:WDOG:DEL 600
Clear Output Protection
If an over-voltage, over-current, over-temperature, power-fail condition, power-limit condition,
protection condition, or inhibit signal occurs, the power system turns off the affected output channel.
The appropriate operating status indicator on the front panel will be on. To clear the protection
function and restore normal operation, first remove that condition that caused the protection fault.
Then, clear the protection function as follows:
Front Panel Menu Reference SCPI Command
Select Protect\Clear
Select Clear.
To clear a protection fault:
OUTP:PROT:CLE (@1)
4 Operating the Power System
158 Keysight N6700C Operating and Service Guide
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