The top row of keys is for computations and test functions. The
white keys on the top row (WD, DD, M %M) compute wet
density, dry density, moisture content, and percent moisture,
respectively. The %MAR and %PRO keys are used to compute
percent of Marshall and percent of Proctor. The SET key is used
to read or change the value of the established Proctor or
Marshall target.
The 〈TST〉 key is used to initiate the self-test routines; these test
routines are described starting on page
6-8.
5. The group of slide switches is located on the printed circuit
board behind the front panel. To gain access to these
switches, loosen the four thumbscrews in each corner of the
front panel and lift it out of the gauge cavity. The functions
of the switches are listed below:
MEAS/TST switch – In the TST position, a known signal is
applied to the counter inputs for testing purposes. In the MEAS
position, the gauge functions normally.
PCF/SI switch – This toggles the display units for computed
results. In the PCF position, computations results are displayed
in pounds-per-cubic foot. In the SI position, results are
displayed in kilograms-per-cubic meter.
6. Moisture correction switches are used to offset the gauges’
moisture readings.
7. The Depth switch is always set to the same value as the
depth of the source rod when performing a measurements.
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