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90
5)
Pulse input “Dual Pulse”
Press the
【
Pulse
】
key or tap [Pulse] on the touchscreen, the Pulse Modu Config Dialog pops up;
rotate the knob clockwise (or counterclockwise) to select “Source” option, press the
knob to select [D-Pulse] under [M-Pulse]; or tap “Source” on the touchscreen to select [D-Pulse]
under [M-Pulse].
Activate the D-Pulse trigger mode (Fig.3.19).
Fig.3.19 D-Pulse Mode
3.2.8 Baseband trigger function configuration
Series S1465 Signal Generator has three trigger modes for real-time baseband: continuous,
single and gate; the trigger sources of baseband include: trigger key (Key), external (Ext) and bus
(Bus). See 4.1.5 Baseband of 4.1 Menu description for details.
Example 1: Real-time baseband mode. Data source: PN9, symbol rate: 4Mbps, modulation
type: QPSK, trigger mode: single, trigger source: external, polarity: positive, delay: off.
Operation steps:
Step 1. Connect the instrument as shown in Fig.3.20.
Connect I/Q signal output on the rear panel to two input ports of a oscilloscope via the BNC
cables, set another signal generator to the pulse modulation output mode and use it as the external
trigger source (pulse width: 50μs, period: 200μs). Connect to “Monitor Output” of this signal generator
to a BNC tee connector, of which one end is connected to “Code Pattern Trigger Input”
of the vector signal generator and the other end is connected to the third input port of the
oscilloscope.
