Symmetricom 5401 User Manual

Operating Manual

Installation

PN 8500-0150, Rev. A, May 2005

6

1.

Install the unit in the desired location and connect the unit to an AC power source. Refer 
to 

 for specifications and connector designations and locations. 

2.

Connect the 1 PPS input to its 1 PPS source and connect the 1 PPS and 10 MHz outputs 
to their desired destinations. 

Connection to the RS232 I/O is not necessary for operation, but it is desirable in order to 
monitor status or enter new control parameters.  

Upon completion of the installation: 

1.

Apply power to the unit by turning on the front panel ON/OFF power switch. Observe that 
the green POWER LED indicator illuminates. 

2.

After approximately five minutes, the internal Rubidium oscillator will have attained lock 
(resonance). The 10 MHz outputs are now stable for use. Disciplining of the Rubidium 
oscillator will begin once 1 PPS input is present. 

The 5402 is now operational and will begin to discipline the Rubidium using the control 
parameters that were previously stored in battery-backed RAM when the unit was last 
powered-down.  

The amplitude of each of the 10 MHz outputs can be individually adjusted with 
potentiometers located on the 3 Channel Distribution Amplifier (Assembly 35039). Access to 
these potentiometers is through holes in the rear panel. Each hole (and its associated 
potentiometer) is clearly labeled as to which output it adjusts. See 

 for the location of 

the adjustments. 

Figure 4

 Symmetricom 5402 Rear Panel