Agilent Technologies E3633A, E3634A manual To Disconnect the Output Using an External Relay

Chapter 5 Service

To Disconnect the Output Using an External Relay

	To Disconnect 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 {OFFON}. The TTL
	output is available on the RS-232 connector pin 1 and pin 9.
	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 below 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.
	Installation Procedure
	The assembly drawings and schematics are located in chapter 8, ‘‘Schematics’’.

1Remove the front and rear bumpers and take off the cover (See the mechanical disassembly drawing on page 127).

2Install JP3 and JP4 located adjacent to the connector P5 (The JP3 and JP4 are outlined with a circle in the component locator diagram on page 128).

A bare wire may be used.

3Reassemble the power supply.

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