Start-up Sequence
72 X72 Desiger’s Reference and User’s Guide 097-10603-01 Rev. A – November 2004
Start-up Sequence
The accuracy at shipment is <±5xE
–11
typical when power has been connected for
the proper amount of time.
After four minutes the rubidium oscillator will reach a locked condition and its output
signals will stabilize.
After 7.5 minutes the accuracy of the X72 oscillator will be at <1xE
–9
.
Aging and temperature coefficient performance of the X72 unit will vary according to
the application profile specified by the customer at time of order. Refer to the X72
product specification for information on application profiles and unit performance.
21 LOCK Output If low, indicates Rb osc. is locked
22 FXO
Output
2
(FXO) ACMOS output equalling the VCXO frequency
23 FACMOS RTN GND Return for FACMOS & FXO signals
24 FACMOS OUT Output (FACMOS) ACMOS Output Option - equals VCXO
frequency divided by 2xN (N is selectable).
25 FSINE RTN GND Chassis ground – return signal for FSINE signal
26 FSINE OUT Output (FSINE) Sine output option – equals VCXO frequency
Note:
1 All inputs and outputs are ESD protected
2 High impedance
Note: Refer to Appendix A for the listed connector manufacturer's
specification sheets.
Note: Signals will appear at the outputs immediately after power is
applied to the unit, but these output signals will swing up to ±2xE
–6
until after the oscillator has locked.
Table C-1. Connector J1 Signal Information (Continued)
PIN#
SIGNAL
NAME
TYPE
1
SIGNAL FUNCTION
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