Chapter 4 111
Basic Digital Operation
Using the Dual ARB Waveform Player
respectively. The sequence with the changes is stored under the same name to the Catalog of Seq
Files in the signal generator’s memory catalog.
Saving Changes to a Different Sequence Name
1. Press
Name and Store.
2. Press
Editing Keys > Clear Text.
3. Enter a file name (for example, CH64_100+CH9_200) using the alpha/symbol softkeys and the numeric
keypad.
4. Press
Enter.
A new waveform sequence, CH64_100+CH9_200 is now defined based on the original sequence. It is a
copy of the original sequence, FWDCH_64+FWDCH_9.
Adding Real-Time Noise to a Dual ARB Waveform (Option 403)
The signal generator with option 403 can apply additive white gaussian noise (AWGN) to a carrier in real
time while the modulating waveform file is being played by the dual ARB waveform player. The AWGN
can be configured using front-panel softkeys. The
Carrier to Noise Ratio softkey allows you to specify the
amount of noise power relative to carrier power that is applied to the signal. The
Carrier Bandwidth softkey
sets the bandwidth over which the noise is integrated and the
Noise Bandwidth Factor softkey allows you to
select a flat noise bandwidth. Refer to the E4428C/38C ESG SCPI Command Reference for remote operation
commands and the E4428C/38C ESG Signal Generator Key and Data Field Reference for key descriptions.
The following procedure sets up a carrier and modulates it using the pre-defined SINE_TEST_WFM
waveform file. AWGN is then applied to the carrier.
Configuring AWGN
1. Preset the signal generator. Press the
Preset hardkey.
2. Press the
Frequency hardkey and enter 1.5 GHz.
3. Press the
Amplitude hardkey and enter –10 dBm.
4. Press
RF On Off to On.
5. Press
Mode > Dual ARB > Select Waveform and highlight the SINE_TEST_WFM waveform.
6. Press
Select Waveform.
7. Press
ARB Off On to On.
8. Press
ARB Setup > ARB Sample Clock enter 50 MHz.
9. Press
Real-time Noise Setup > Carrier to Noise Ratio and enter 30 dB.
10. Press
Carrier Bandwidth and enter 40 MHz.
11. Press
Real-time Noise Off On to On.
This procedure applies AWGN to the 1.5 GHz carrier. The displayed power level of the signal generator,
–10 dBm, will include the noise power which is set as a carrier to noise ratio (C/N) of 30 dB. Noise power,
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