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APOLLO CURRENT METER INPUTS & CONFIGURATIONS (Applies to both Apollo A.C. & D.C. current meters)
Apollo Current Meters incorporate a basic
0 to 199.9 mV voltmeter circuit together with
a string of built-in current shunts that can be
connected to provide current measuring
ranges from 0 to 199.9 μA to 1.999 amps in
5 decade steps. A built-in scaling pot. also
allows the unit to be used as a scaleable
millivoltmeter and provides for arbitrary
current scaling. Note: When used to readout
in scaled units other than voltage or current,
the front panel adjustment can be used as a
fine trim scaling adjustment.
CURRENT METER SCALING
The numerical current value displayed
by the Apollo current meter can be scaled
down to almost any lower numerical value
by connecting the scale adj. pot. This pot
can be set to divide the normal numerical
current reading by any division factor
between ÷1 and ÷13. In addition, the shunt
resistance chosen can be reduced by
connecting the current lead to a lower
resistance (higher range tap) .
INSTALLATION ENVIRONMENT
The unit should be installed in a location that does not exceed the maximum
operating temperature and provides good air circulation. Placing the unit near
devices that generate excessive heat should be avoided.
The bezel should be cleaned only with a soft cloth and neutral soap product.
Do NOT use solvents. Continuous exposure to direct sunlight may accelerate
the aging process of the bezel.
4
EXAMPLE
In the diagram (left) , the Apollo Current Meter has been connected to
measure a circuit current to 120.0 mA maximum. However, in this application,
the readout is to be in percent of load current, with 120.0 mA being equivalent
to 100.0% readout. The scale adj. pot. connected as shown can be adjusted to
reduce the normal 120.0 mA display to the 100.0% display desired. The input
current leads could also be connected to 4 and 3 instead of 5 and 3 as shown,
and this would yield a readout to 100% and allow the decimal point and least
significant digit (0.1%) to be dropped.
Scaling to obtain a numerical readout higher than the numerical value of the
current can also be done in most cases by simply feeding the current input into
a lower range. However, at the higher current range (1.999 A) and with external
shunts, care should be taken to avoid exceeding maximum shunt current.
For example, if the unit is measuring a maximum current of 1.3 amps
(current flowing between terminals 3 and 4) , the numerical current value will
be 1.300 displayed. Here, it is impossible to increase the numerical scaled value
to say 1.500 by connecting to the next sensitivity (199.9 mA) since the 1.3 amp
actual current exceeds the maximum current rating of this range (See
“Specifications” for maximum current.)
Installation
The unit meets NEMA 4/IP65 requirements for indoor use when properly
installed. The units are intended to be mounted into an enclosed panel
Two mounting clips and screws are provided for easy installation.
Consideration should be given to the thickness of the panel. A panel which is
too thin may distort and not provide a water-tight seal. (Recommended minimum
panel thickness is 1/8".)
After the panel cut-out has been completed and deburred, carefully slide the
gasket over the rear of the unit to the panel. Insert the unit into the panel.
As depicted in the drawing, install the screws into the narrow end of the
mounting clips. Thread the screws into the clips until the pointed end just
protrudes through the other side.
Install each of the mounting clips by inserting the wide lip of the clips into
the wide end of the hole, located on either side of the case. Then snap the clip
onto the case.
Tighten the screws evenly to apply
uniform compression, thus providing
a water-tight seal.
Caution: Only minimum pressure is
required to seal panel. Do NOT
overtighten screws.
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