Bird Technologies 3129 Display - Manual (Page 25)

9
•
If:
•
The VSWR is equal to or slightly greater than the maximum, addi-
tional measurements are accumulated to determine a trend.
•
Reverse power is increasing, an alarm is triggered.
•
The reverse power is stable, measurements continue until a trend is
established.
An alarm will be set if the VSWR exceeds the maximum for
more than thirty seconds.
•
If the VSWR is much greater than the maximum then an alarm is trig-
gered immediately.
Alarm on Zero Power
When the forward power is very small (< 2.5% of full scale), the measured VSWR
becomes large due to the noise floor of the sensor. Under these conditions, the
VSWR level is meaningless. When the zero power alarm is disabled, the VSWR
will not be monitored at these low powers.
High Power Alarm
When the high power alarm is enabled, the forward power is continuously moni-
tored. The alarm trigger is a percentage of the Monitor’s full scale power, from 0 –
125%. If the forward power is greater than the trigger level, an alarm is triggered.
Low Power Alarm
When the low power alarm is enabled, the forward power is continuously moni-
tored. The alarm trigger is a percentage of the Monitor’s full scale power, from 0 –
125%. If the forward power is less than the trigger level, an alarm is triggered.