Spatial averaging with the 8718b – NARDA 8718B User Manual

Page 41

Advertising
background image

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.

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

Advertising