800gench2.fm Rev. A 800TCU User’s Guide 2-5
Installation and Operation
Key 4:
Use to display or modify the Error Bypass or Advance/Retard parameters. Press the
SETUP and ENTER simultaneously and a number key to modify the particular display in
view.
1. ERROR BYPASS is the number of input code frames containing errors that will be
ignored before they are loaded into the internal time registers. From the CHANGE
ERROR BYPASS
display, the number keys allow scrolling through the possible
selections on the display. ERROR BYPASS is active in both the Translator and Sync
Generator modes.
2. ADV/RET RATE is used to manually synchronize the Generator to an external
reference. From the CHANGE ADV/RET RATE display, the number keys scroll through
the possible rate selections on the display. The choices can be sequentially made larger
or smaller by pushing the odd or even number keys. The “Disabled” state cancels both
the advance and retard. When the desired rate has been selected, the left- and
right-arrow keys are used to implement the retard and advance each time the
respective key is pressed. When an advance or retard is performed by the internal
logic, the LED above the respective arrow key is momentarily illuminated.
3. In the Synchronized Generator mode, the indicators above the arrow keys are
illuminated when the internal logic automatically performs an advance or retard. The
relative rate of flashing is an indication of the frequency error between the input code
and the Generator time base. If the input code has failed and the * has been
illuminated in the Translator Time Status display, the respective LED above the arrow
keys will flash at the rate at which the automatic 500 ns advance or retard corrections
are being inserted.
Key 5:
Use to select the polarity of the input code, turn the filter on and off, control the Generator
External-Start operation and set the propagation delay.
1. Press key 5 until
FILTER CONTROL is displayed. Press SETUP and the display will
read CHANGE FILT CTRL and the current setting will be displayed. Off-On is the
filter status and inverted/non-inverted is the polarity setting. Press any number key and
the display will scroll through the four possible settings. When Off/Non-inverted
is displayed, press ENTER.
2. The EXT START display may be selected by pressing key 5 when the unit is in the
Generate mode and is stopped. Pressing SETUP allows the user to select either the
positive or negative going edge of the External Start input pulse, which is used to start
the unit. Press the SETUP and ENTER simultaneously, then any number keys to
select the desired edge, either rising or falling. Pressing the ENTER key will enable
the LED above the START switch, which will flash on the occurrence of each
External Start edge. The flashing LED indicates that the External Start input is active.
The display should read Push Start to engage Ext Start. When the START
switch is pressed, the next edge of the External Start pulse will start the unit.
3. PROPAGATION DELAY is used in the Sync-Generate Mode to compensate for
transmission delays from the source of the input code. Press the SETUP and ENTER
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