Agilent Technologies 33250A User Manual (English)

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173

Chapter 4 Remote Interface Reference

Frequency Modulation (FM) Commands

FM Commands

FM:SOURce {INTernal|EXTernal}

FM:SOURce?

Select the source of the modulating signal. The function generator will

accept an internal or external modulation source. The default is INT.

The :SOUR? query returns “INT” or “EXT”.

•If you select the External source, the carrier waveform is modulated

with an external waveform. The frequency deviation is controlled

by the ±5V signal level present on the rear-panel Modulation In

connector. For example, if you have set the deviation to 100 kHz

using the FM:DEV command, then a +5V signal level corresponds to a

100 kHz increase in frequency. Lower external signal levels produce

less deviation and negative signal levels reduce the frequency below

the carrier frequency.

FM:

INTernal

:FUNCtion {SINusoid|SQUare|RAMP|NRAMp|TRIangle|NOISe|USER}

:FUNCtion?

Select the shape of the modulating waveform. Used only when the

Internal

modulation source is selected (

FM:SOUR INT

command). You can

use noise as the modulating waveshape, but you cannot use noise, pulse,

or dc as the carrier waveform. The default is SIN. The :FUNC? query

returns “SIN”, “SQU”, “RAMP”, “NRAM”, “TRI”, “NOIS”, or “USER”.

• Select “SQU” for a square waveform with a 50% duty cycle.

• Select “RAMP” for a ramp waveform with 100% symmetry.

• Select “TRI” for a ramp waveform with 50% symmetry.

• Select “NRAM” (negative ramp) for a ramp waveform

with 0% symmetry.

• If you select an arbitrary waveform as the modulating waveshape

(“USER”), the waveform is automatically limited to 8K points.

Extra waveform points are removed using decimation.

Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and

VOLT:OFFS commands to configure the carrier waveform.

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General

Frequency Range	1 µHz to 80 MHz
Amplitude Range	10 mVpp to 10 Vpp into 50 Ω
Output Impedance	50 Ω
Modulation Types	AM, FM, PM, FSK, PWM
Sweep Modes	Linear, Logarithmic
Function Generator Type	Arbitrary
Waveforms	Sine, Square, Ramp, Triangle, Noise, Arbitrary
Interface	GPIB, USB