FDU-160i
FDU-160i Frequency Distribution Unit – Operation and Maintenance Manual
P/N 900000136 REV B
12
5.1.1
Changing the reference switch mode.
From the dropdown labeled, “Select Reference Switch Mode,” select which mode the unit
uses to switch references in the event of a problem. The available modes are listed below.
•
Non-Reversionary:
If the primary reference source fails or is out of
threshold, the system will automatically switch over to the secondary reference
source, and continue to use the secondary until manually switched back to the
primary source, or the secondary source fails and the system automatically
switches back to the primary.
•
Reversionary:
The system will switch to the secondary source
automatically if the primary source fails or is out of threshold, however once the
primary source is restored, the unit will immediately switch back
•
Reversionary with Delay:
The system will automatically switch to the
secondary source in the event the primary source fails or is out of threshold. Once
the primary source is restored, it will automatically switch back after waiting for a
user-specified delay. This setting is useful for helping the unit deal with
intermittent problems on a primary frequency source.
5.1.1.1
Adjusting the reversionary delay.
The text box “Reversionary Delay” is used to set the delay time in seconds used when the
system is set to the “Reversionary with Delay” Reference Switch mode.
5.1.2
Setting the input units.
The Section labeled “Input Voltage Units” allows the user to change the input reference
units on the system. The system can be set to accept input in dBm (default), V
rms
, or V
pp
.
To set the threshold values, select an amplitude unit first, then set the values.