Front-Panel Menu Operation Introduction
Output a Modulated Waveform
A modulated waveform consists of a carrier waveform and a modulating waveform. In AM (amplitude modulation), the
carrier amplitude is varied by the modulating waveform. For this example, you will output an AM waveform with 80%
modulation depth. The carrier will be a 5 kHz sine wave and the modulating waveform will be a 200 Hz sine wave.
1. Select the function, frequency, and carrier amplitude.
Press the Waveforms key and then press Sine. Press the Frequency, Amplitude, and Offset softkeys to con-
figure the carrier waveform. For this example, select a 5 kHz sine wave with an amplitude of 5 Vpp, with 0 V offset.
Note that you may specify amplitude in Vpp, Vrms or dBm. To do this, either enter the value with the number pad
or press .
2. Select AM.
Press Modulate and then select "AM" using the Type softkey. Then press Modulate to turn modulation on.
Notice that the Modulate button is illuminated, and the status message "AM Modulated by Sine" appears at the
top left of the display.
3. Set the modulation depth.
Press the AM Depth softkey and then set the value to 80% using the numeric keypad or the knob and cursor
keys.
4. Select the modulating waveform shape.
Press Shape to select the modulating waveform's shape. For this example, select a sine wave.
5. Press More and then AM Freq. Set the value to 200 Hz using the numeric keypad or the knob and cursor keys.
Press Hz to finish entering the number if you are using the numeric keypad.
Output an FSK Waveform
You can configure the instrument to "shift" its output frequency between two preset values using FSK modulation. The
rate at which the output shifts between the two frequencies (called the "carrier frequency" and the "hop frequency") is
determined by the internal rate generator or the signal level on the rear-panel Ext Trig connector. For this example,
you will set the "carrier" frequency to 3 kHz and the "hop" frequency to 500 Hz, with an FSK rate of 100 Hz.
Agilent 33500 Series Operating and Service Guide 29
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