TM 5-6675-330-12&P
System Configuration
The AutoRanger @ IIx EDM instrument is a lightweight,
compact unit designed for convenient tribrach moun-
ting (see Figure 4), The integral yoke azimuth base pro-
vides a convenient set-up for distance measurements
only.
Operating power for the AutoRanger o IIx EDM instru-
ment is supplied by a compact, 12-volt battery unit, An
auxiliary power cable which permits operation of the
instrument from any convenient 12-volt DC power
source, such as a lead-acid battery, is also supplied,
The instrument uses a current modulated, solid state,
light-emitting diode as a light source, The light beam
modulating frequencies are generated by an internal
quartz-crystal oscillator, which has a stability of f 1
ppm to assure measurement accuracy, An audible
signal indicates when the invisible [infrared) light beam
is on target,
Automatic Display Updating
With the instrument set to range mode, the 8-digit
numerical display is continually updated approximate-
ly every 6 seconds. A rodman can move backward or
forward with the retro-reflector, and the instrument will
display the new distance automatically. Momentary in-
terruptions of the light beam by traffic, atmospheric
disturbances, wildlife, etc., will not affect the ranging
sequence or accuracy of the distance measurements.
Slope distance readouts are provided directly in
meters and must be converted to horizontal distances
for survey computation.
Simple Operation
After sighting the instrument onto the retro-reflector and
maximizing the return signal, the operator performs the
following simple steps,
a. Presses calibrate switch.
b. Waits for Ready Light.
c. Switches from the aim mode to the range mode
by pressing a switch
The AutoRanger m IIx EDM instrument is designed for
operation with an on-board battery unit, Two battery
units are supplied with the instrument. Approximately
750 continuous measurements can be made from
each battery before recharging is necessary, A battery
charger is supplied which is capable of charging both
batteries at the same time.
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