Chapter 3 Front-Panel Operation
Disabling the Output Using an External Relay
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3
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”.
Note 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.
Note 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
or 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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