Chapter 5 155
Analog Modulation
Configuring Pulse Modulation (Option UNU/UNW)
Triggering Simultaneous Pulses from Two PSGs Using an Internal or an External Pulse Source
Two PSG pulse generators can be triggered simultaneously using the PSG internal pulse generator or
using an external pulse source. The pulse from PSG1 is triggered internally or by the external pulse
generator and the pulse from PSG2 is triggered using the SYNC OUT signal from PSG1. Each PSG can
be set to different pulse widths, pulse repetition intervals (PRI), and RF output frequencies. Refer to
“Configuring FM (Option UNT)” on page 152 and to “Configuring Pulse Modulation (Option
UNU/UNW)” on page 154.
1. Ensure the two PSGs should have the same "Analog Mod Gen" PC board part numbers installed
(i.e. E8251- 60306) and board software code version (i.e. A0100).
You can view this information by selecting the Utility hardkey, then selecting the Instrument
Info/Help Mode and the Installed Board Info softkeys on each PSG.
2. Set PSG1 to its RF output frequency (f1) and PSG2 to its frequency (f2).
3. Connect the two PSGs as shown in Figure 5- 1 on page 156. For connection details, refer to
Table 5- 1.
CAUTION The cables should be as short as possible.
Table 5-1 PSG Connectivity for Simultaneous Pulse Configuration
From (PSG1)
a
:
a.If an external pulse source is being used as the pulse trigger, connect the
pulse source’s pulse output connector to the PSG1
GATE/PULSE/TRIGGER INPUT.
To (PSG2):
10 MHz OUT 10 MHz IN
SYNC OUT GATE/PULSE/TRIGGER INPUT
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