Setting The Level Dial - 3M ScanEM-QC CTK019 User Manual

Setting the Level Dial

The Level dial sets the reference level for field strength measurements. The
sensitivity of the 3M ScanEM-HQC Electromagnetic Near-Field 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-QC Probe at an area of
expected "average" emission on the tested product, and adjust the Level dial
to the new background level.
You can use the Level dial to put the 3M ScanEM-QC Probe in squelch
™
mode. Follow the procedure outlined in the previous paragraph, only set the
reference level just below the point where the green LED turns on. This way
your ScanEM-QC Probe will be quiet and the lights will be off until you pass
it over an area where the EM level is higher than your reference setting. When
testing a product for compliance, for example, you may want to scan some
other product that has passed the emission test before, and set the background
level of the ScanEM-QC Probe to the average emission level of that product.
Then scan the product you are trying to
get agency approval for to look for areas
with higher emission levels.
Setting the Level dial to 0 completely
disables the ScanEM-QC's Probe own
indication and is used for its operation as
a probe only. Use Level settings of 1 and
above in stand-alone operation.
Figure A: 3M ScanEM-QC Probe Reaction
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