Setting The Level Dial - 3M ScanEM-C User Manual

‰ With your index finger adjust the Level dial so that only the green LED
is On.
‰ Position the 3M
and bring its antenna as close as possible without actually touching the
tested product.
‰ Move the ScanEM-C Probe around the tested product or area and
observe changes in sound and LED output.
The closer the ScanEM-C Probe's antenna is to the tested area, the greater
its resolution. A scan performed an inch or two away from the product can
direct you to the general area where high emissions are generated, but the
precise location of the source can be found only when the antenna is in close
proximity to the product.

Setting the Level Dial

The Level dial sets the reference level for field strength measurements. The
sensitivity of the ScanEM-C Probe stays the same regardless of the position
of the Level dial (Figure A). If you let go of the Operate button and then
press it again, you will not need to readjust the level.
Set the Level dial so that when the antenna is pointed away from the tested
device, only the green LED is "On" (the pitch of the sound will be at the low
end of its range). If the tested product
is "noisy" as far as the EM level is
concerned, the LED bar may be totally
lit most of the time and the pitch may
be constantly high. In this case, point
the ScanEM-C Probe at an area of
expected "average" emission on the
tested product, and adjust the Level
dial to the new background level.
ScanEM-C Probe perpendicular to the tested area
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Figure A: 3M ScanEM-C Probe Reaction
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