46
Model Three - Operation Manual
Single Channel Level Testing
When set to the single channel level test, the Model Three displays bar
graphs of the video and audio carriers as well as numeric readouts of the
carrier amplitudes and V/A difference. The Model Three can also display a
spectrum scan of the selected channel showing the amplitudes of the
video and audio carriers and undesired signals that may be present, such
as intermodulation.
To access the Level screen, press the
LEVEL
LEVEL
4 JKL
key.
The Model Three displays the Level screen for the last channel it was on
before being turned off.
TV Channels
When measuring a TV type channel with audio and video carriers (see
Chapter 4: Setup, Channel Plan, Edit User Plan
), the left column of
the bar graph represents the video carrier while the right column
displays the audio carrier. The V/A
Δ
is displayed below the video and
audio carriers.
To change the channel, use the
__
and
keys or press the
FCN
FCN
0
key
,
enter the desired channel number, and press the
F
1
F
1
(ENTER)
key.
The Level screen displays a scale that you can adjust by pressing the
F
3
(DOWN)
key so that the functions of the
F
1
F
1
and
F
2
keys become
SCALE
and
REF
. Press the
F
1
F
1
(SCALE)
key to vary the graduation of
the scale according to a
1
,
2
,
5
, and
10
dB per division scale.
Channel
Channel label
Video carrier
Audio carrier
V/A
Δ
F1
F2
F3
Channel type
User plan
