Tektronix TG700, Руководство пользователя, Страница: 247 / 343

GPS7 GPS Synchronization and Timecode Module
LTC TIMING Submenu Use this menu to set the delay used for all the signal formats. Use the left ( ◄ ) or
right ( ► ) arrow button to set the delay. (See Table 3-19.) Press the ENTER button
to con fi rm the selection. The following fi gure shows the LTC TIMING submenu.
Figure 3-71: GPS7 module LTC TIMING submenu
GPI Submenu
Use this menu to select the function that will be performed when a signal is
received on the GPI input. The signal is normally pulled high by an internal
resistor, and will trigger the selected function when pulled low. The following
fi gure shows the GPI submenu.
Figure 3-72: GPS7 module GPI submenu
Use the left ( ◄ ) or right ( ► ) arrow button to select from the following settings:
NONE: Disables the GPI input.
Reset Program Time: Resets the Program Time counter.
Reacquire Position: Reacquires the GPS signal. At least 60 readings from
four satellites are required to establish and save a new averaged position.
Jam Sync: When in GPS mode, performs an immediate jam sync (which can
also be done from the JAM SYNC submenu). (See page 3-129.)
When in VITC time mode, performs an immediate jam sync and sets the
instrument time from the input timecode.
Both actions require that the input timecode has been valid for 100 continuous
frames. In VITC mode, this input is equivalent to executing set commands
from both the Jam Sync menu and the Time of Day synchronize function.
TG700 TV Signal Generator Platform User Manual 3–135