X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
3
3
-
-
2
2
2
2
R
R
E
E
V
V
E
E
TI:
.123456789
or
ET: 123:24:12:60
.123456789
Pressing "FUNC/ENTR" will abort measurement and return to the previous menu allowing selection of
the TI/ET mode. Pressing any of these keys will abort the TI/ET function: "TIME", "STATUS" or
"POSITION".
3-129 KEYPAD FUNCTION 29 - FREQUENCY MEASUREMENT INPUT (OPTION)
Refer to manual Section 3-229 "SERIAL FUNCTION F29 - FREQUENCY MEASUREMENT INPUT
(OPTION)" for a detailed operating description of this function. The keypad version offers a subset of
the capabilities available in the Serial function version.
This function allows the user to set up periodic high-resolution, fractional, frequency-offset
measurements of an externally applied 1, 5, or 10 MHz input relative to the GPS disciplined internal or
external oscillator. These measurements are then displayed at the user-set interval until another key is
pressed.
Press "FUNC/ENTR", "2","9". The display will show:
External Freq
10 MHz
Use the up or down arrow keys to select the correct input frequency for the XL-DC to measure. Press
"FUNC/ENTR" to enter the selection. The display will now show:
Meas Interval
000001 sec
Use a combination of right and left arrow keys and either the up and down arrow keys or direct digit
entry to set the frequency measurement interval. Press "FUNC/ENTR" to enter the selection. After
completion of the first measurement, the display will show:
Ext Freq XX:XX:XX
+x.xxxxxxxxxe-xx
where XX:XX:XX is the time stamp of the endpoint of the displayed measurement and +x.xxxxxxxxe-xx
is the fractional frequency offset measurement. These measurements will continually be displayed at
the interval selected until any of these keys is pressed: "FUNC/ENTR", "TIME", "STATUS", or
"POSITION".
3-130 reserved
3-131 KEYPAD FUNCTION 31 - BACKLIGHT ENABLE
Use Function 31 to turn "on" or "off" the display back light. The backlight is standard on the
alphanumeric display and therefore present on all units. However, the backlight for the numeric display
is optional and may not be on your particular unit. Function 31 controls both backlights. The as
shipped default is "on". The default value on power-up will be that in use prior to power-down.
Summary of Contents for 151-600
Page 2: ...Model XL DC Serial Number__________________ September 15 1997 Revision E...
Page 4: ......
Page 27: ...X...
