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Chapter 3 Front-Panel Operation and Features

Disabling the Output

The output of the power supply can be disabled or enabled from the front panel.

• When the power supply is in the “Off” state, the

OFF annunciator turns on and the

output is disabled. The

OFF annunciator turns off when the power supply returns

to the “On” state. When the output is disabled, the voltage value is 0 volts and the

current value is 0.02 amps. This gives a zero output voltage without actually

disconnecting the output.

• The output state is stored in volatile memory; the output is always disabled when

power has been off or after a remote interface reset.

• While the output is disabled, the control knob is locked to prevent from any

unwanted changes occurring. But the other front panel keys are working.

• To lock the control knob, move the flashing digit to the right or left using or

resolution selection keys until the flashing digit disappears.

To see or check the changes while the output is disabled, press before returning

to meter mode.

• Front-panel operation:

output Off

• Remote interface operation:

OUTP {OFF|ON}

Disconnecting the Output Using an External Relay

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”. The TTL output of pin 1 or pin 9 of the RS-232 connector is available

only after installing two jumpers (JP1 and JP2) inside the power supply. See the

Service Information to locate them.

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.

Display

Limit

On/Off

Output

Agilent Technologies E3648A User Manual

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