Agilent Technologies E1441A user service FM Carrier Waveform Shape, FM Carrier Frequency

100 kHz

•FM Carrier Frequency

•Frequency Modulating Waveform Shape

•Frequency Modulating Waveform Frequency

•Peak Frequency Deviation

FM Carrier Waveform Shape

FM Carrier Frequency

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

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

FM:STATe OFFON

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

You cannot use the noise function or dc volts as the FM carrier waveform.

Use the following command to set the shape of the carrier waveform:

FUNCtion:SHAPe SINusoidSQUareTRIangleRAMPUSER

You can also use the APPLy command to select the function, frequency, amplitude, and offset with a single command. Because the APPLy command also changes duty cycle, modulation type, trigger source, and trigger slope, you must place the APPLy command first in any sequence of configuration commands.

Carrier frequency: 10 mHz to 15 MHz (100 kHz for triangle and ramp). The default is 1 kHz.

For arbitrary waveforms, the maximum carrier frequency depends on the number of points specified in the waveform. The five built-in arbitrary waveforms can be output at a maximum of 5 MHz.

The carrier frequency must always be greater than or equal to the peak frequency deviation. If you attempt to set the carrier frequency to a value less than the deviation, the function generator will auto-matically adjust the carrier frequency to equal the present deviation. A -221, “Settings conflict” error is generated and the carrier frequency is adjusted.

The sum of the carrier frequency and peak frequency deviation must be less than or equal to the maximum frequency for the selected function plus

(15.1 MHz for sine and square, 200 kHz for triangle and ramp, and 5.1 MHz for arbitrary waveforms). If you attempt to set the carrier frequency to a value that is not valid, the function generator will automatically adjust the carrier frequency to equal the present deviation. A -221, “Settings conflict” error is generated and the deviation is adjusted.

Use the following command to set the carrier frequency:

FREQuency <frequency>MINimumMAXimum

Chapter 2 Agilent E1441A Application Information 31