Agilent Technologies E3632A manual Disabling the Output Using an External Relay, Knob Locking

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Chapter 3 Front-Panel Operation

Disabling the Output Using an External Relay

Disabling the Output Using an External Relay
When the output of the E3632A is turned off, it is implemented by setting the
output to 0 volts and 0.02 amps. This gives a zero output voltage without
actually disconnecting the output. To disconnect the output an external relay
must be connected between the output and the load. A TTL signal of either low
true or high true is provided to control an external relay. This signal can only
be controlled with the remote command OUTPut:RELay {OFFON}. The TTL
output is available on the RS-232 connection pin 1 and pin 0.
When the OUTPut:RELay state is “ON”, the TTL output of pin 1 is high	3
(4.5 V) and pin 9 is low (0.5 V). The levels are reversed when the
OUTPut:RELay state is “OFF”.

TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing two jumpers inside the power supply. See the Service Guide for more information.

Do not use the RS-232 interface if you have configured the power supply to output relay control signals. Internal components on the RS-232 circuitry may be damaged.

Knob Locking

The knob locking function can be used to disable the knob, thereby preventing any unwanted changes during an experiment, or when you leave the power supply unattended. To disable the knob, press the resolution selection key until the blinking digit disappears.

Notice that the knob and front panel keys are disabled when in the remote interface mode.

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