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Getting Started
Making a Measurement
When the peak of a signal does not appear on the screen, it may be
necessary to adjust the amplitude level on the screen. Press
@GKiKKZJ
REF LEVEL 48.8
dBmV
appears in the active function block. The REF LVL
softkey label appears in inverse video to indicate that reference level is the
active function. The reference level is the top graticule line on the display
and is set to 48.8
dBmV.
Changing the value of the reference level changes
the amplitude level of the top graticule line.
If desired, use the reference level function to place the signal peak on
the screen using the knob, step keys, or number/units keypad. (Marker
functions determine the frequency and amplitude of a signal.)
Figure 2-5 demonstrates the relationship between center frequency and
reference level. The box in the figure represents the cable TV analyzer
screen. Changing the center frequency changes the horizontal placement
of the signal on the screen. Changing the reference level changes the
vertical placement of the signal on the screen. Increasing the span
increases the frequency range that appears horizontally on the screen.
I
A
2
FREQUENCY
2
REFERENCE
LEVEL
2-18
FREOUENC
Y
Figure
2-5.
Relationship between Frequency and Amplitude