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40 Operating the Meter
Spatial Averaging with the 8718B
The Model 8718B uses time to quickly make precise, spatially
averaged measurements. With the 8718B set for spatial
averaging, press the F1 function key to start the timer. Pressing
the same key again stops the timer. During this interval of time,
the meter takes a large number of measurements. The results
are presented as both an average value and a peak value.
Effective measurement technique requires you to simply move
the probe slowly from toe-to-head while the timer is running.
Although this technique may not be specifically called out in a
particular exposure standard, it is technically sound and much
more accurate than averaging a series of measurements. It is
anticipated that future updates of the major standards will reflect
this automatic technique now that the survey equipment makes
it practical.
To make spatially averaged measurements ...
1. Access the menu system by pressing the function key
that corresponds to the legend below MENU on the
bottom line of the display.
2. Press the number 3 on the keypad to select SPATIAL
from the First Menu Screen.
3. Press F1 (ON).
4. The meter will automatically return to the measurement
screen with new options for the function keys. If you
had accessed the menu system from the Opening
Menu Screen (where the calibration dates are shown),
you will return to that screen.
5. Holding the meter in one hand and the probe in the
other, touch the head of the probe to the ground.
SPAT I AL AVERAGI NG
MODE I S ON
ON OFF
F1 F2 F3 F4