© National Instruments
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3-21
RMX Programmable Power Supplies User Manual
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. If you apply a
LOW (0 to 0.5 V) or short-circuit to pin 5 of the J1 connector, the alarms will be cleared.
Alarm Clear Connection
Connect your external contact between pins 5 and 19 of the J1 connector. The open-circuit
voltage across pins 5 and 19 is approximately 5 V. The short-circuit current across pins 5 and 19
is approximately 0.5 mA.
Use external contacts that have a contact rating greater than or equal to 0.5 mA at 5 VDC.
Figure 3-21.
Alarm Clear Connection.
If two or more units are floating, and you are using a single external contact to clear alarms, use
a relay or similar device for the external contact signal to isolate the signal transmitted to each
unit.
2-core shielded wire or
twisted-pair wire
Output terminals
J1
5
19
RMX
S
