Tektronix TG700, Руководство пользователя

Страница: 224 / 343

GPS7 GPS Synchronization and Timecode Module
STATUS.
Displays the status of the GPS7 module.
The top line displays the selected timecode reference and signal presence. When
the internal reference frequency is used as the timecode reference, the top line
displays
Internal .
NOTE.
When GPS is set as the timecode reference, the top line includes the
Figure of Merit (FOM) rating for the relative strength of the GPS signal. (See
page 3-103, Figures of Merit (FOM).)
The bottom line displays the additional status of the GPS7 module. Use the left
(
◄ ) or right ( ► ) arrow button to view the following status displays:
Genlock amplitude and VITC line number
Date and time of the currently used timecode reference
UTC time display
Program time counter
GPS signal quality and the number of satellites detected versus satellites
usable
NOTE. Signal quality is an indicator of how well the GPS signal is being received.
It is a sum of the correlation for each of the satellites. It can be used to evaluate
the antenna and connecting cable, but it can take a while for the receivers to
recognize which satellites are available and stabilize at the
fi nal level.
Antenna power status: Power OFF , Open , Short , or Nominal .
NOTE.
A shorted GPS antenna will not damage the GPS7 module. If a splitter is
used on the antenna, it may appear as a short at DC but will still pass through
the RF signal, which will allow the GPS to function.
The status will read Open if no antenna is connected or if the current load is less
than expected because a splitter or DC block is being used.
REFERENCE.
Selects the timing reference and the response for a loss of lock to
the timing reference. Select this menu item, and then press the ENTER button to
access the REFERENCE submenu. (See page 3-114.)
SELECT OUTPUT. Selects which output to con fi gure for signal format, timing,
and timecode parameters. Use the left ( ◄ ) or right ( ► ) arrow button to select
the output you want to con fi gure (BLACK 1, BLACK 2, or BLACK 3), and then
press the ENTER button to access the BLACK submenu. (See page 3-117.)
3–112 TG700 TV Signal Generator Platform User Manual