TrueTime 151-600, Manual

Page: 19 / 107

X X L L D D C C M M A A N N . . d d o o c c 1 1 - - 5 5 R R E E V V E E
The XL-DC timing and frequency specifications are:
1 PPS Output GPS Time
±
150 ns
Accuracy: UTC-USNO <40 ns rms (150 ns peak)
Frequency Output
Accuracy:
< 3 x 10
-12
Frequency/Timing Allan Deviation,
Stability: 1 x 10
-9
@ 1 sec
3 x 10
-10
@ 10 sec
3 x 10
-10
@ 100 sec
3 x 10
-12
@ 1 day
Oscillator 2x10
-6
, over 0
°
C to 50
°
C when not
Stability: tracking satellites.
IRIG B Amplitude Modulated Output (STANDARD):
Accuracy:
10
µ
s to UTC
IRIG B DC Level Shift Output (OPTION):
Accuracy:
150 ns to UTC, 100 ns without SA
Time Interval/Event Timing Input (OPTION):
Resolution:
30 ns, single shot.
Accuracy: 150 ns + 30ns/2
Frequency Measurement Input (OPTION):
Resolution:
6 x 10
-11
@ 1 second interval
Accuracy: 3 x 10
-12
Stability: Same as Frequency & Timing Stability
1-15 INTERFACE SPECIFICATIONS
The standard serial data port is a bidirectional EIA standard RS-232C interface. RS-422 is available as
an option. The specifications are:
Data: Time, day of year through milliseconds, in ASCII characters, output once per
second or on request. Also special functions as listed in Section III.
Data Rates: User-selectable on Models XL-DC-601/602 from 300, 600, 1200, 2400, 4800,
9600 and 19200 bps. Fixed on Model XL-DC-600 (user-specified).
Data Bits: User-selectable on Models XL-DC-601/602 from 7 or 8. Fixed on Model
XL-DC-600 (user-specified).
Parity: User-selectable on Models XL-DC-601/602 from even, odd or none.
Fixed on Model XL-DC-600 (user-specified).
Stop Bits: User-selectable on Models XL-DC-601/602 from 1 or 2. Fixed on Model
XL-DC-600 (user-specified).