CHAPTER THREE
The two digit year (YR) is shown in Row Two starting at Column Nine. Starting at Column
Sixteen of Row Two is the DAC, a 5 digit (00000 to 65535) number which is a digital
representation of the analog voltage (0 to +5volts) that controls/disciplines the internal 10MHz
oscillator.
The last data displayed in this screen is the Time Interval (INT) which is an example of the time
interval measurement between the 1PPS output and an externally supplied 1PPS input.
Time Interval Measurement is operational in the AUTO, DYNAMIC, and STATIONARY
modes when “LOCKED” with the following qualification: If after achieving “LOCKED” the
unit loses satellites and the “TRACKING” and “LOCKED” LEDs go out, this function will still
be operational until satellites are reacquired. At that point, it won’t be operational again until
“LOCKED” has been achieved. This function is always available in “FLYWHEEL” mode.
3.3.3 SET-UP MENU SCREEN
Subsequent pushing of the MENU keyboard switch will display the Set-up Menu Screen which
is shown below and contains the following choices:
Column:
Row 1
Row 2
If the #0 keyboard switch
is pressed, the operational software version and the current Leap Second will appear in the lower
right-hand corner (in place of “SET DAC”).
1 5 10 15 20 25 30 35 40
| | | | | | | | |
1>SET MODE 3>SET POSITION 5>OFFSET 00.0H
2>SET TIME 4>SIGNAL LEVEL 6>SET DAC
A. 1> SET MODE (MODE SELECTION)
To set the mode, press the #1 keyboard switch. The display will change to that as shown
below:
0>AUTO 1>STATIONARY 4>DYNAMIC 5>FLYWHEEL
OPERATING MODE: AUTO
Choice “0>AUTO”
Depressing the “0” keyboard switch selects the “AUTO” mode. Pressing the MENU
keyboard switch will return the display to the SET-UP MENU SCREEN. The “AUTO”
mode uses four satellites. If more than four satellites are in view and useable, a set of
four based on optimal satellite (minimum PDOP) geometry is automatically selected for
use.
3-10 ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
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