Keysight E8663D, Руководство пользователя

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188 Keysight E8357D/67D & E8663D PSG User’s Guide
Custom Arb Waveform Generator
Working with User–Defined Setups (Modes)-Custom Arb Only
Working with User–Defined Setups (Modes)-Custom Arb Only
Modifying a Single–Carrier NADC Setup
In this procedure, you learn how to start with a single–carrier NADC digital
modulation and modify it to a custom waveform with customized modulation
type, symbol rate, and filtering.
1. Press Preset .
2. Press Mode > Custom > ARB Waveform Generator > Setup Select >
NADC .
3. Press Digital Mod Define > Modulation Type > PSK > QPSK and OQPSK >
QPSK .
4. Press Symbol Rate > 56 > ksps .
5. Press Filter > Select > Nyquist .
6. Press Return > Return > Digital Modulation Off On .
This generates a waveform with the custom single–carrier NADC digital
modulation state. The display changes to
Dig Mod Setup: NADC
(Modified)
. During waveform generation, the
DIGMOD
and
I/Q
annunciators appear and the custom single–carrier digital modulation
state is stored in volatile memory.
7. Set the RF output frequency to 835 MHz.
8. Set the output amplitude to 0 dBm.
9. Press RF On/Off .
The user–defined NADC signal is now available at the RF OUTPUT
connector.
10. Press Return > Return .
This returns to the top–level Digital Modulation menu, where Digital
Modulation Off On is the first softkey.
11. Press Digital Mod Define > Store Custom Dig Mod State > Store To File .
If there is already a file name from the
Catalog of DMOD Files
occupying the active entry area, press: Edit Keys > Clear Text
12. Enter a file name (for example,
NADCQPSK
) using the alpha keys and the
numeric keypad.
13. Press Enter .
The user–defined single–carrier digital modulation state should now be
stored in non–volatile memory. The RF output amplitude, frequency, and
operating state settings are not stored as part of a user–defined digital
modulation state file.