Inhibit Input
Pin 3 can be configured as a remote inhibit input. The Inhibit Input function lets an external input signal
control the output state of instrument. The input is level triggered. The signal latency is 5
microseconds. Pin 8 is the common for pin 3.
The following non-volatile inhibit input modes can be programmed:
LATChing - causes a logic-true transition on the Inhibit input to disable the output. The output will
remain disabled after the inhibit signal is received.
LIVE - allows the enabled output to follow the state of the Inhibit input. When the Inhibit input is true,
the output is disabled. When the Inhibit input is false, the output is re-enabled.
OFF - The Inhibit input is ignored.
To configure the Inhibit Input function:
Front Panel Menu Reference SCPI Command
Select System\IO\DigPort\Pins.
Select pin 3, then Function, then InhibitIn.
In the Polarity field, select either Positive or Negative.
Select Protect\Inhibit.
Select either Latching or Live.
To disable the Inhibit signal, select Off.
To selectthe Inhibit function:
DIG:PIN3:FUNC INH
To selectthe pin polarity:
DIG:PIN3:POL POS
To setInhibit mode to Latching:
OUTP:INH:MODE LATC
To setInhibit mode to Live:
OUTP:INH:MODE LIVE
To disable the Inhibit signal:
OUTP:INH:MODE OFF
Fault/Inhibit System Protection
As shown in the following figure, when the Fault outputs and Inhibit inputs of several instruments are
daisy-chained, an internal fault condition in one of the units will disable all outputs without
intervention by either the controller or external circuitry. Note that when using the Fault/Inhibit signals
in this manner, both signals must be set to the same polarity.
Also, as shown in the figure, you can also connect the Inhibit input to a manual switch or external
control signal that will short the Inhibit pin to common whenever it is necessary to disable all outputs.
Negative polarity must be programmed for all pins in this case. You can also use the Fault output to
drive an external relay circuit or signal other devices whenever a protection fault occurs.
Keysight N6900/N7900 Series Operating and Service Guide 155
4 Using the Advanced Power System
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