BIRD Wattcher 3170B, Operation Manual

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Appendix 2 User Applications and Wiring
This section is a collection of user specific applications and the wiring information required to activate them.
Connector Assignment
Table 20 - BNC Jacks
Table 21 - Terminal Strip
Active Forward Monitor (AFM) Input
Wiring concept examples for activating the AFM circuit are shown below. These can be used for remote onsite or
offsite manual or automatic activation.
Connection Description Function Levels
RF Power Input Forward/
Reflected
DC Input Forward & Reflected Detected RF signals from sensors
30

A full scale into 1400

(42mV). May be overranged to
100mV
Main Meter
Forward/Reflected
DC Main Meter Drive Output Current to drive indicating meters
30mA full scale into 1400W
(42mV)
Remote Meters Forward/
Reflected
DC Remote Meter Drive Output
Voltage to drive remote
indicating meters
1.038V full scale (use 33.2k
resistor in series with standard
Bird 30mA meters
Connection Description Function Levels
TB1(+),
TB2(-)
External 12V Supply Used to allow mobile operation
See
Figure 18 on page 31
for connection information
TB3,4 Auxiliary Alarm Inputs
Signals to trip alarms from
external sources
TTL levels, active low. Pulled up to
5V by 4.7k internally. Shunted to
ground by 0.1

F capacitor.
TB5 5V Output Regulated 5V out put Can supply 360mA max.
TB6 Alarm Output
Low when alarm is sounding,
returned high by reset
Active low. Pulled up to 5V by
4.7k. Will sink 1.5A and source
1mA.
TB7 Ground Chassis ground Reference for signals.
TB8 Reset Input /Output
Input to reset Wattcher from
external source. May be used as
an output to reset other
equipment when Wattcher is
reset by the front panel switch.
TTL levels, active low. Pulled up to
5V by 4.7k internally. Shunted to
ground by 10

F capacitor.
TB9 Confirm Output
Low when forward power
exceeds the users confirm set
point Active low. Pulled up to 5V by
4.7k. Will sink 1.5A and source
1mA.
TB10
Active Forward Monitor Input
(Carrier On)
Indicates to the Wattcher that the
RF is on and that forward power
should be monitored for a low
condition. There is an adjustable
internal delay on the leading edge
of this signal.
TTL levels, active low. Pulled up to
5V by 4.7k.