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Chpater 6 163
Custom Arb Waveform Generator
Configuring Hardware
9. Press Ext Delay Time > 100 > msec.
The Custom Arb Waveform Generator has been configured to play a single multicarrier waveform
100 milliseconds after it detects a change in TTL state from low to high at the PATT TRIG IN rear
panel connector.
10.Set the function generator waveform to a 0.1 Hz square wave at an output level of 0 to 5V.
11. On the signal generator, press
Mode > Custom > Arb Waveform Generator > Digital Modulation Off On until On
is highlighted.
This generates a waveform with the custom multicarrier state and the display changes to Dig Mod
Setup: Multicarrier.
During waveform generation, the DIGMOD and I/Q annunciators activate and the new custom
multicarrier state is stored in volatile ARB memory. The waveform should be modulating the RF
carrier.
12. Press
RF On/Off.
The externally single-triggered custom multicarrier waveform should be available at the signal
generator’s RF OUTPUT connector 100 ms after receiving a change in TTL state from low to high
at the PATT TRIG IN.
To Set the ARB Reference
Setting for an External or Internal Reference
1. Press
Custom > Arb Waveform Generator > More (1 of 2).
2. Press
ARB Reference Ext Int to select either external or internal as the waveform sample clock
reference.
• If you select Ext, you must enter the reference frequency (250 kHz to 100 MHz) and apply the
reference signal to the rear-panel BASEBAND GEN REF IN.
• If you select Int, the internal clock is used for the arbitrary waveform (ARB) frequency
reference.
Setting the External Frequency
The external Arb reference frequency is only used when the
ARB Reference Ext Int softkey has been set to
Ext (external).
1. Press
Custom > Arb Waveform Generator > More (1 of 2).
2. Press
Reference Freq, enter a desired frequency (250 kHz to 100 MHz), and press MHz, kHz, or Hz.