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The D.C. power supply generates the drive power for the system and can
be considered as a battery.
THE 4-20mA meter/recorder can be a passive moving coil mA meter with
a zero offset. To obtain a reading, current must be applied.
The transducer completes the loop and allows a current flow around the
loop dependent on the level of stimulus to the transducer. It can be con-
sidered as a potentiometer changing in resistance to let between 4 and
20 mA to flow.
The 1044 can be used to check this system in either source or measure
modes of operation and has a 24V compliance voltage when set to cur-
rent source mode that will power a loop.
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