Symmetricom 5401 User Manual

PN 8500-0150, Rev. A, May 2005

3

Operating Manual

Installation

This section describes the unpacking, inspection, installation, and operation of the 
Symmetricom 5401 and 5402 Disciplined Rubidium Oscillators.  

The DRO is packaged in one shipping container. Inspect the unit for visible damage 
(scratches, dents, etc.). If the instrument is damaged, immediately notify both Symmetricom 
and the responsible carrier. Keep the shipping container and packing material for the carrier's 
inspection. 

1.

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

 for specifications and connector pin assignments. 

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 RS-232 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 and observe that the green POWER LED indicator illuminates. 
Note that this unit does NOT contain a power switch. 

2.

After approximately five minutes, the yellow LOCK LED indicator will illuminate indicating 
that the internal Rubidium oscillator has attained lock (resonance). The 10 MHz outputs 
are now stable for use. Disciplining of the Rubidium oscillator will begin once a 1 PPS 
input is present. 

When communicating with either Symmetricom or the responsible carrier 

regarding shipping damage, refer to the serial number. This number is located 
on the front panel of the 5401 and the rear panel of the 5402.