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Connection Technology Center, Inc.
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7939 Rae Boulevard
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Victor, NY 14564
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(585) 924-5900
regulator. This voltage is factory set to p24 VDC compliance voltage at +5 mA output
level.
EXTERNAL POWER SOURCES
Model PS12A may be powered by an external DC power source such as batteries or a DC power
supply. 24 VDC is recommended but voltages down to 18 volts are sufficient. (With voltages as
low as +18 volts, the front panel LED voltmeter may not function normally, however the unit
will work normally otherwise.)
To use an external supply, connect the leads from the power source to the twin banana plugs at
the rear panel. Be sure to observe the proper polarity as marked at the rear panel. A protective
diode is built into the PS12A to preclude damage from reverse polarity connection of the power
source.
Switch the front panel toggle switch to ‘EXT PWR’. With +24 VDC as the power source, It will be
noticed that the LED voltmeter may indicate one segment lower than normal when there is no
sensor connected to that channel. This is normal and will not affect the operation of the units
or the sensors.
When operating from batteries or an external DC power supply, the operation of the sensors
and power units, aside from the minor points mentioned, will be the same as with AC power.
The center position of the power toggle switch is the “off” position and should be used when
the instrument is not taking data, to prolong battery life.
