Disabling The Output Using An External Relay; Knob Locking - Agilent Technologies E3633A User Manual

Chapter 3 Front-Panel Operation

Disabling the Output Using an External Relay

Disabling the Output Using an External Relay

When the output of the power supply 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 {OFF|ON}. 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
(4.5 V) and pin 9 is low (0.5 V). The levels are reversed when the OUTPut:RELay
state is "OFF".
N o t e 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.
N o t e 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 control knob can be locked to prevent from any unwanted changes occurring
during an experiment, or when you leave the power supply unattended. To lock the
knob, move the blinking digit to the right or left using the resolution selection key
<
Notice that the knob and front panel keys are disabled when in the remote interface
mode.
>
or until the blinking digit disappears.
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