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.

S P A T I A L A V E R A G I N G

M O D E I S O N

O

N

 

 

O

F

F

F1

F2

F3

F4

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.

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Operating the Meter