prevents momentary input power spikes from triggering the over-power protection. The delay can be
programmed from 0 to 0.255 seconds.
Front Panel Menu Reference SCPI Command
Select Protect\OPP
Check Enable to enable OPP. Enter a delay value.
Then press Select.
To enable over-power protection:
POW:PROT:STAT ON, (@1)
To specify a 10 millisecond delay:
POW:PROT:DEL 0.01, (@1)
Couple Output Protection
Protection coupling lets you disable all output channels when a protection condition occurs on a
single output channel. To couple output protection:
Front Panel Menu Reference SCPI Command
Select Protect\Coupling
Check Enable Coupling. Then press Select.
To enable output protection coupling:
OUTP:PROT:COUP ON
Query the Over-Temperature Margin
You can query the margin remaining before the over-temperature trips and shuts down the output.
The temperature margin is the minimum difference between the internal temperature sensors and the
fixed over-temperature trip level. The margin is returned in degrees Celsius.
Front Panel Menu Reference SCPI Command
Select Protect\OT
Displays the over-temperature margin. Then press
Select.
To query the over-temperature margin:
OUTP:PROT:TEMP:MARG? (@1)
Set the Oscillation Protection
This information applies to Keysight Models N678xA SMU only.
If open sense leads or capacitive loads outside the allowable range cause the output to oscillate, the
oscillation protection function detects the oscillation and latches the output off. The condition is
annunciated on the front panel by the OSC status annunciator.
Front Panel Menu Reference SCPI Command
Select Protect\OSC
Check the OSC box. Then press Select.
To enable oscillation protection for output 1 and
2:
OUTP:PROT:OSC ON, (@1,2)
Keysight N6700C Operating and Service Guide 157
4 Operating the Power System
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