4
One-Way External Triggering Communication
The signal source’s TRIG OUT is connected to the power meter’s TRIG IN (see Figure 1). Then
the Start, Stop, and Step frequencies are set for the signal source and power meter. Once the
sweeping operation starts, the signal source steps through the frequency points and outputs
a trigger signal to the power meter at every step for synchronization purposes. Only 1-way
synchronization occurs during this process, which is from the signal source to the power meter.
A proper dwell time has to be setup in the signal source to ensure the measurement readings
of the power meter are settled before stepping through to the next frequency point. At the end
of the frequency step the FETCH? command is used to retrieve all the buffered readings at once.
This same process applies for power step. The buffer memory of power meter is a maximum of
2,048 readings.
BNC cable
P-Series power meter
ESG signal source
Power sensor
Trig In
Trig out
Two-way External Triggering Communication
To set up a 2-way external triggering communication, where the trigger output enables the
mode’s 2-way handshake, the signal source’s TRIG OUT is connected to the power meter’s
TRIG IN. The power meter’s TRIG OUT is connected to the signal source’s TRIG IN (see Figure
2). Then the Start, Stop, and Step frequencies are set for the signal source and power meter.
Once the sweeping operation begins the signal source steps to the first frequency point and
generates a trigger output signal to the power meter, the acquisition begins. After the measure-
ment reading is settled and stored, the power meter outputs a trigger signal back to the signal
source to continue with the next frequency step. The sequence is repeated for every frequency
step. With this method, there is synchronized communication in 2-way hardware triggering and
setting the correct dwell time on the signal source is not required. At the end of the frequency
step the FETCH? command is used to retrieve all of the buffered readings at once.
Figure 1. One-way communication
external triggering setup diagram
BNC cable
P-Series power meter
ESG signal source
Trig in Trig out
Trig outTrig in
Figure 2. Two-way communication
external triggering setup diagram
(482 paginas)
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