Disabling The Output; Disconnecting The Output Using An External Relay - Agilent Technologies E3647A User Manual

Chapter 3 Front-Panel Operation and Features

Disabling the Output

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
output is disabled. The
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
To see or check the changes while the output is disabled, press
to meter mode.
•
•

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.
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.
OFF
resolution selection keys until the flashing digit disappears.
>
Front-panel operation:
Output output Off
On/Off
Remote interface operation:
OUTP {OFF|ON}
annunciator turns on and the
OFF
annunciator turns off when the power supply returns
or
<
Display before returning
Limit
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