The Panning Approach - Aaronia NF-5030S Manual

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5.0 Your first measurement / Modes

5.5 The panning approach

When evaluating exposure limits, usually only the maximum signal level is

important. This maximum can be determined by using the so-called "panning

approach", which is already established as a legally binding means of measu-

rement in many countries. Proceed as follows:

Choose the desired frequency range. In our example, we have already done so

(key 2). Activate HOLD mode (dot key) as described previously. Afterwards plea-

se also activate 3D measurement by pressing the 8 key. This will save you the

hassle of having to move the device around constantly in all directions near the

measurement subject.

Now, keep measuring until the value stops changing completely. You have now

determined the signal maximum at a particular position/location.

However, should you wish to determine the signal maximum in an entire room,

you additionally need to measure at every possible position. Walk through the

entire room, pay special attention to the walls and electrical appliances, where

you will often find the strongest signals due to electrical wiring. During measu-

rement, the displayed signal strength will rapidly increase, until at some point it

will stop changing and "freeze" at the signal maximum. This can take several

minutes when testing an entire room. After completion of this procedure, the

maximum signal strength found in the entire room is shown on the display.

As field strength diminishes very rapidly with increasing distance (depending on

the source, r, r² or even r³), you can quite easily determine the exact location of

a signal source (the higher the signal level, the closer the source). Of course,

you will need to turn off HOLD mode in this case. Next, simply try to find the sig-

nal maximum in various rooms to get acquainted with the panning approach and

the importance of HOLD mode.

Now, of course your measurement result is not that useful if you cannot relate it

to any exposure limits. Until today this used to be very complex with the need to

browse complex tables and convert between physical units. A highly daunting

task for the novice and even for some experts. SPECTRAN offers therefore a

special and easy to handle mode for exposure limit calculation:

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Spectran nf