Martel Electronics 320 - Manual (Page 39)

turn on. Open the loop and power down occurs. This
allows for maximum battery life by not allowing the
unit to be left in the on mode accidentally.
The LPS can be used with or without the Model 320
calibrator. When the test leads are connected from the
LPS Loop Power connections to a device requiring
power, the LPS automatically turns itself on and
provides 24 VDC. Breaking the connections causes
the LPS to automatically turn itself off, preventing
needless battery drain.
To use the Model 320 calibrator with the LPS, simply
plug the special connector provided with the LPS from
the plug marked “Calibrator mA Input” on the LPS to
the Model 320 milliamp input terminals. This
automatically puts the Model 320 in series with the 4
to 20 mA loop. Reference page 42.
The Batteries of the LPS can be checked by plugging
the same special cable provided with LPS from the
plug marked “Battery Charger” on the LPS, to the V
input jacks on the Model 320. When voltage is
selected on the keypad, the LPS battery voltage will
be displayed on the Model 320.
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