1/20/97
N
N
T
T
S
S
-
-
2
2
0
0
1
1
.
.
M
M
A
A
N
N
3
3
-
-
9
9
R
R
e
e
v
v
.
.
A
A
Fourth tq flag:
00010000000ns
or the current value. Press the right or left arrow keys to position the cursor beneath the
digit that you wish to change. Press the up or down arrow keys to scroll through the
possible digit choices. Alternately, directly enter the numbers using the key pad. The
cursor will advance to the next digit automatically. When the display shows the value that
you desire for the fourth time quality threshold, press "FUNC/ENTR" to enter all of the data.
The acceptable threshold values are 40000000000 ns to 00000000010 ns.
3.21
FUNCTION 06 - KEYPAD LOCK ENABLE
3.21.1
Use function 06 to enable or disable the keypad. The keypad lock function, when
enabled, prevents unauthorized or accidental entries on the keypad. The initial out-of-
the-box default is "off". The default upon subsequent power-ups will be the same as it
was on the previous power-down.
3.21.2
Press "FUNC/ENTR" then "0" "6". The display will show
Keypad Lock
or
Keypad Lock
on
off
3.21.3
Press up or down arrow keys to toggle between "on" and "off". When the display shows
the desired choice, press "FUNC/ENTR". After the keypad lock is enabled, any attempt
to enter a function on the keypad (except keypad function 06) will result in the message
"Keypad locked" or "Function not implemented".
3.22
FUNCTION 13 - WORST-CASE TIME ERROR REQUEST
3.22.1
Use function 13 to display the worst-case time error due to oscillator drift during periods
when synchronization input is not present.
3.22.2
Press "FUNC/ENTR", then "1" "3". The display will show:
Time error
Over range
if the unit has not yet acquired valid time or:
Time error
±
00.000010000
if the unit has acquired valid time. If the NTS-100 acquired valid time but subsequently
lost lock to the signals, then the time displayed and output will begin to drift. This drift is
dependent on the stability of the internal oscillator, and the accuracy to which it had been
set on frequency prior to the outage. The processor calculates and displays in seconds
the worst-case time based on the stability of the oscillator in use.
