Chapter 15 - Spectrum analyzer 109
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15.5
Input of the center frequency
You can enter and activate a new center frequency at any time using the numeric keypad and by
pressing
ENTER
. The cursor is then moved to the new position or, if the distance to the cut-off
frequencies permits, the frequency segment is shifted such that the cursor is in the center.
TV range in the channel input mode:
Using the menu item
CHANNEL
, you can switch between the input of C channels and S channels.
Now you can type in a channel number using the numeric keypad. After you confirm with the
ENTER
key, the measuring instrument displays the spectrum around the set channel. Invalid
entries are ignored.
15.6
Switching between frequency and channel mode
You can only do this in the TV range. You can switch between modes via the menu items
CHANNEL
and
FREQUENCY
.
15.7
Level display
During each search, the level of the cursor frequency is measured and displayed in the upper right
edge of the screen in dBµV. Level measurement in analyzer mode is comparable to a pure
spectrum analyzer.
The power within the measuring bandwidth (RBW) is measured and converted into level in dBµV.
On the other hand, the level measurement in measuring receiver mode always measures the
power (level) in the channel.
TV range in the channel input mode:
The measuring instrument differentiates here automatically between analog and digital channels.
With analog channels, the level is based on the peak value of the video carrier. With digital
channels, the total power within the channel bandwidth is measured. It is not important here which
SPAN is set.
15.8
Progress bar
A yellow bar on the lower edge of the screen grows from left to right during each new search by the
analyzer. This allows you to follow the position of the “sweep”.
