X
X
L
L
D
D
C
C
M
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A
A
N
N
.
.
d
d
o
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c
c
3
3
-
-
2
2
1
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R
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3-118 KEYPAD FUNCTION 18 - SOFTWARE VERSION REQUEST
Use keypad Function 18 to obtain information about the current version of the software installed in the
unit.
Press "FUNC/ENTR", then "1" "8". The display will show, for example:
TRUETIME Mk III
sys ver 020
Press any of the arrow keys to change the display to the clock-specific version. For example:
GPS-XL V1.036
182-6007v015
Repeated presses of the arrow keys will switch back and forth between the two displays.
The example shown indicates that the system software is version 20, the GPS-XL version is 1.036 and
the clock-specific software is PART NO. 182-6007 version 015.
To return to the status display, press the "FUNC/ENTR” or the "STATUS" button.
3-119 through 3-127 reserved
3-128 KEYPAD FUNCTION 28 - TIME INTERVAL/EVENT TIMING INPUT (OPTION)
Refer to manual Section 1-41 for specifications on the Time Interval/Event Timing Input. Use this
function to measure the relationship of either periodic or randomly occurring events to the internal time
of the XL-DC.
The Time Interval (TI) mode is best suited to periodic events such as measuring an externally applied 1
PPS input. In this mode the reported time interval is expressed as the fractional part of a second
between the XL-DC 1 PPS which starts the count and the external 1 PPS which stops it.
The Event Timing (ET) mode is suited to randomly occurring events whose time of occurrence is
needed to a high accuracy. In this mode, the reported event time is expressed as a complete day-of-
year through nanoseconds timetag.
Press "FUNC/ENTR", "2","8". The display will show:
Select TI or ET
Time Interval
Press the up or down arrow key to toggle between the two modes of operation. When the desired
mode is displayed, press "FUNC/ENTR" to set it. The display will show one of these formats for the
measurements:
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