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3 Using the Source/Load Functions
Enable Protection Coupling – Checking this box lets you couple the outputs so that when a protection
fault occurs on one output, ALL outputs will be turned off.
Enable Oscillation Protection - This is only available on models N678xA SMU
. 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.
All Outputs – For all outputs you can program the Inhibit input (digital pin 3) on the rear panel to act as
an external protection shutdown signal. The behavior of this signal can be set to either Latched or Live
(non-latched). Off disables the remote inhibit. Refer to
Inhibit Input
for further information.
Watchdog – For all outputs you can program a watchdog timer function. The output watchdog timer
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. This condition is annunciated on the front panel by the Prot status. The delay is
programmable from 1 to 3600 seconds in 1 second increments.
From the remote interface:
To program the INH signal to act as an external shutdown:
DIG:PIN3:FUNC INH
To configure the pin polarity for pin 3:
DIG:PIN3:POL POS
To enable output protection coupling:
OUTP:PROT:COUP ON
To enable output oscillation protection:
OUTP:PROT:OSC ON, (@1)
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Keysight N6705C User's Guide
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