Tektronix 77807-1, User Manual

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Operating Basics
DS1000 Series User Manual
2–5
Once the self-tests complete, the unit initializes itself, which takes
about 1 second to perform if the internal non-volatile memory is
valid.
If the memory has been corrupted or damaged, then the television
demodulator will attempt to load factory default settings. This
process takes 5 to 10 seconds. When the initialization sequence
completes, the unit displays the current channel/frequency
selection along with the RF signal strength.
Selecting Display Modes
To access the display modes for the television demodulator, press the
DISPLAY button on the front panel. Each press of the display button
accesses the next display mode. When you reach the last display
mode, the next press of the display button returns the display to the
first display mode. The following list describes the display modes in
their order of appearance:
1. System Status.
After power on sequence completes, the display shows the current
channel and frequency selection and the RF signal strength for the
channel and frequency.
The channel number is taken from the frequency table you select.
It may be either numeric or alphanumeric depending on its
definition in the frequency table.
If the frequency does not correspond to a channel frequency in the
current frequency table, then the channel number is replaced by
asterisks.
The RF signal strength is displayed in the form of a bar graph and
represents the signal strength for the current channel frequency. A
weak signal (RF amplitude < 100
m
V) is represented by 10 dashes
‘–’ on the bar graph. As the signal strength increases in amplitude,
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