Agilent Technologies E1441A user service Amplitude Modulation AM, AM Carrier Waveform Shape

Amplitude Modulation (AM)

previously specified as a storage location. For example, an error is generated if you attempt to recall from memory location “2” but have never stored to that location.

A +810, “State has not been stored” error is generated if nothing is stored in the specified memory location.

Any arbitrary waveforms downloaded to “VOLATILE” memory are not remembered. However, if an arbitrary waveform is being output from non-volatilememory when the state is stored, the waveform data is stored. The stored waveform is output when the instrument state is recalled.

If you delete an arbitrary waveform after storing the state, the waveform data is lost and the function generator will output the “SINC” waveform in place of the deleted waveform when the state is recalled.

Use the following commands to save and recall states:

*SAV 0123 *RCL 0123

You can delete individual stored states and clear the memory location. If nothing is stored in the specified memory location, a +810, “State has not been stored” error is generated. Do not delete state 0 or an error +772 will be generated. See “772” on page 148.

MEMory:STATe:DELete 0123

A modulated waveform consists of a carrier waveform and a modulating waveform. In AM, the amplitude of the carrier is varied by the amplitude of the modulating waveform. The function generator will accept an internal modulating signal, an external modulating signal, or both. Topics covered on amplitude modulation are:

•AM Carrier Waveform Shape

•AM Carrier Frequency

•Amplitude Modulating Waveform Shape

•Amplitude Modulating Waveform Frequency

•Amplitude Modulation Depth

•Amplitude Modulating Source

AM Carrier Waveform Shape

Only one modulation mode can be enabled at a time. When you enable AM, the previous modulation mode is turned off.

Use the following command to select AM modulation: To ensure proper operation, you should enable AM after you have set up the other modulation parameters.

AM:STATe OFFON

AM carrier shape: Sine, Square, Triangle, Ramp, or Arbitrary waveform. The default is Sine.

28 Agilent E1441A Application Information Chapter 2