HAMAR LASER STEALTH Series, General Training Manual

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Readouts
The R-307 Digital Readout
The Model R-307 is a portable two-axis readout used for measuring a stationary laser beam. Used with
the T-251 Scanner Preamp, the R-307 can also measure data from single axis scanning targets (see Figure
46). The R-307 Readout can display data supplied by the A-510, A-517 (T-214 with stand), T-212, T-218
and the T-261 targets.
Figure 46 – R-307 and R-308 Digital Readouts
The R-308 Digital Readout
The Model R-308 is a portable one-axis readout used specifically for measuring the height of a target
above or below the scan plane of a laser beam. It has a single display window; otherwise, the connections
and controls are the same as those of the R-307. The R-308 Readout can display data from various
targets; however, it is most frequently used with the A-517.
In addition to a Low Battery LED on top of the unit, there are also two manual switches: The
Power
Switch
and the
Scale Selector Switch
. The Power Switch has three positions: OFF, SLOW and FAST.
When there is a great deal of air turbulence, set the readout to the SLOW setting and watch the numbers
on the display adjust slowly. This averages out some of the readout variations often caused by heat, fog or
particulate matter in the atmosphere. In normal conditions, the Power Switch should be set to FAST.
The Scale Selector Switch sets the unit to display readings in either inches or millimeters. On some
readouts, both English and metric scales are accommodated. Other units provide only metric data settings.
Switching between scales will show that the number .0234 in. will read as 23.4 on the .0001 in. scale,
.023 on the .001 in. scale and 0.59 on a .01 mm scale.
The Low Battery LED between the two switches flashes to indicate when the charge on the battery is too
low for proper operation of the unit. When the power is too low, the LED may stop flashing even though
the unit may continue to operate for a short while.