6
Front and Rear Panels
2.2.1
Command Key Definitions
Figure 2.2 illustrates the keypad and annunciator LEDs on the Model 1201B/C showing the place-
ment and basic functions. The details below provide additional description for each of these keys.
SETUP
TIME/DATE
DOWN
ANTENNA
UP
TIMING
ENTER
SYSTEM
NORMAL
LEARN
UNLOCKED
ALARM
OPERATE
POWER A
POWER B
FAULT
Figure 2.2: Keypad and Annunciator LEDs
TIME/DATE
: Press to set the display(s) to the desired time/date display mode. There are four
modes of the time display available and repeated pressing of this key will cause the display to scroll
through all four modes continuously. Changing the time display does not effect time data, which
is output from rear-panel timing outputs.
ANTENNA
: Press to view the antenna status (indicating antenna voltage and current), GNSS satel-
lite tracking information, longitude, latitude, and elevation of the antenna location according to
the most recent position fix.
TIMING
: Press the to view the clock status, time quality (in time deviation and sigma), esti-
mated holdover uncertainty and event/deviation values.
EVENT/DEVIATION
displays up to 50 event
records, or continuously updates the 1 PPS deviation data.
SYSTEM
: Press the system key to view the clock serial number and firmware version, power supply
voltage(s), EEPROM status, faults, and option board information.
SETUP
: Press SETUP to invoke a series of menus used to adjust configurable parameters within
the clock. In numeric data entry mode, moves the cursor to the left. Allows security lockout.
UP
: Used in conjunction with other menus for selection, to adjust values upward, or to scroll upward
through the available menu choices. Also assists in navigating through main setup menus in normal
order.
DOWN
: Used in conjunction with other menus for selection, to adjust values downward, or to scroll
downward through available menu choices. Also assists in navigating through main setup menus
in reverse order.
ENTER
: Used for confirming changes made within Setup menus. Generally, pressing
ENTER
also
advances to the next parameter, or returns to a higher menu level. In numeric data entry mode,
moves the cursor to the right.
2.2.2
LED Status Indicators
Figure 2.2 also illustrates the eight LED’s that provide information about the operational status
of the instrument. For normal operation, with the clock locked and accurate, the
OPERATE
LED
Summary of Contents for 1201B
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Page 153: ...B 7 Four Fiber Optic Outputs 135 Figure B 4 Jumper Locations ...