5Service
116 Keysight E3633A and E3634A Service Guide
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 {OFF|ON}. 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”.
Installation Procedure
The assembly drawings are located in chapter 6, “Component Drawings”.
1 Remove the front and rear bumpers and take off the cover .
2 Install JP3
[1]
and JP4 located adjacent to the connector P5 (the JP3 and JP4
are outlined with a circle in the component locator diagram on page 125). A
bare wire may be used.
3 Reassemble the power supply.
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.
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.
[1] For serial MY53xx6xxx, install JP001 and JP002 located adjacent to the connector CN001 (the
JP001 and JP002 are outlined with a circle in the component locator diagram onpage 127).
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