62
Model Three - Operation Manual
A Δ Marker function can be used to check the distance (in MHz) and
amplitude difference between any two points in the displayed spectrum.
First, use the
__
and keys to move the marker to a reference
position, then press the
F
2
(
Δ
MKR) key. The
__
and keys now
move the second marker from the reference position, and the Δ Frequency
and Δ Level are displayed.
Press the
F
2
(MARK) key to return to the normal single-marker Spectrum
display.
Press the
F
3
key to change the function of the
F
1
F
1
key to AVG. This
permits the Spectrum function to use an Average mode instead of a Peak
detector. This is most useful for digital channels to see a quick scan of
average power for frequencies within the selected span.
Hum Measurement
The Hum measurement function is used to troubleshoot interference that
may result from a defective power supply or faulty or overloaded power
inserters. This mode includes a Low Pass Filter and 60 Hz and 120 Hz (or
50 Hz and 100 Hz) Band Pass Filter measurements.
To enter the Hum Measurement screen, press the
HUM
9 YZ*
key.
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