© National Instruments | 3-17
RMX Programmable Power Supplies User Manual
Controlling the Output On and Off States
This section explains how to use an external contact to control the output on and off states.
Caution Risk of electric shock. If neither output terminal is tied to chassis ground,
the reinforced or double insulation of the external contact (S) and the connected cable
must be greater than or equal to the isolation voltage of the RMX programmable power
supply. Refer to Appendix A, Specifications, for the isolation voltage of your model.
If one of the output terminals is connected to chassis ground, the insulation of external
contact (S) and the connected cable must have a reinforced or double insulation with a
capacity greater than or equal to the maximum output voltage relative to the chassis.
When using shielded cables for the connection, for uncovered sections of the shielded
cables, use insulation tubes to secure reinforced or double insulation with a capacity
greater than or equal to the isolation voltage of the RMX programmable power supply.
To reduce the noise on the output, connect a 2-core shielded wire or a twisted pair wire, and keep
the wire as short as possible. If the wiring is long, it becomes easy for noise to influence the
operation of the RMX programmable power supply. Even if you use wires that are designed to
suppress noise, the RMX programmable power supply may not operate properly. If you use a
shielded cable, connect the shield to the negative output terminal.
Set CONFIG parameter CF09 to ON to use an external contact to control the output on and off
state of the device.
• Turn the output on with a low signal (CF10: Lo). Output is turned on when a LOW (0 to
0.5 V) or short-circuit is applied between pin 18 and 19 of the J1 connector.
• Turn the output on with a high signal (CF10: Hi). Output is turned on when a HIGH (4.5 to
5 V) or open-circuit is applied between pin 18 and 19 of the J1 connector.
When the external contact has put the output into the off state, the OUTPUT key on the front
panel will not have any effect on the output signal. When the external contact has put the output
into the on state, the OUTPUT key on the front panel can still turn the output off and on. Refer
to Figure 3-16 for more information about how a high signal is used to turn the output on.
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