Symmetricom 5071A, Operating And Programming Manual

Page: 66 / 194

Chapter 3 In Case of Difficulty
Verifying Operation
38 Operating and Programming Manual
Verifying Operation
Perform the Operational Verification starting on page 136 of Appendix A,
―Performance Tests,‖ to verify that the 5071A is operating properly.
Cesium Beam Tube Life
This section provides information to check the Long-Term operating status of the
instrument‘s Cesium Beam tube.
The primary symptom associated with terminal Cesium Beam tube life is a
progressive deterioration in the instrument‘s output stability or accuracy.
Eventually, the Continuous Operation light may extinguish (for no discernible
reason) but can be reset momentarily after any warnings have cleared.
If these symptoms occur:
1 Select the front-panel INFOrmation menu, then press Enter .
2 Check the E_Mult parameter for an excessive increased or decreased value. (See
Table 2-2 on page 21 for typical values.)
3 Check the Gain parameter for an excessive increase in value. (See Table 2-2 on
page 21 for typical values.)
4 The presence of these two parameters at these extremes along with poor
instrument output stability and accuracy is consistent with Cesium Beam tube
failure.
5 Search for Log messages that contain information relevant to Cesium Beam tube
performance.
6 Contact the nearest Symmetricom Customer Service Center for assistance.