Tektronix AFG1022 Function Generator

The maximum variation of carrier amplitude is 50% of the nominal amplitude of the carrier;

If the nominal amplitude of the carrier is 8Vpp, the range of amplitude variation of the modulated carrier is from "8Vpp -4Vpp=4Vpp" (minimum value) to "8Vpp+4Vpp=12Vpp" (maximum value);

When the modulation signal is a sine wave, the amplitude of the carrier wave varies sinusoidally with the modulation signal, and the amplitude of the variation is determined by the modulation depth (the greater the depth, the more significant the amplitude change).

2. Implement SCPI command sequence for AM modulation (channel 1):

Step Function SCPI Command Description

1. Select carrier waveform (sine wave): SOURCE: WAVEform SINusoid. The carrier is a sine wave

2. Set carrier frequency (100kHz): SOURce: FREQuency 100e3 Carrier frequency 100 × 10 ³ Hz

3. Set carrier amplitude (example 8Vpp): SOURce: VOLTage: AMPity 8. Carrier nominal amplitude 8Vpp

4. Enable modulation function: SOURce: MOD: STATe ON Enable modulation mode

5. Choose modulation type (AM): SOURce: MOD: TYPE AM modulation type is amplitude modulation

6. Select modulation source (internal): SOURce: MOD: SOURce INTernal. The modulation signal is generated internally by the instrument

7. Set internal modulation signal frequency (1kHz): SOURce: MOD: INTernal: FREQ 1e3 Modulation signal frequency 1 × 10 ³ Hz

8. Set AM modulation depth (50%): SOURce: MOD: AM: DEPTh 50 Modulation depth 50%

9. Open channel 1 output: OUTPut: STATe ON starts outputting AM modulation signal

3. Command sequence for querying whether the modulation parameters have been successfully configured:

SCPI query command expected return result (example)

1. Check if modulation is enabled: SOURce: MOD: STATe? 1 (indicates activation)

2. Query modulation type: SOURce: MOD: TYPE? AM "(stands for amplitude modulation)

3. Query modulation source: SOURce: MOD: SOURce? INT "(indicating internal source)

4. Query internal modulation signal frequency: SOURce: MOD: INTernal: FREQ?  1.000000e+03（1kHz）

5. Query AM modulation depth: SOURce: MOD: AM: DEPTh?  50.000000e+00（50%）

6. Query carrier frequency: SOURce: FREQuency?  100.000000e+03（100kHz）

7. Query carrier amplitude: SOURce: VOLTage: AMPity?  8.000000e+00（8Vpp）