Agilent Technologies 33250A User Manual (English)

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Chapter 7 Tutorial

Frequency Sweep

Frequency-Shift Keying (FSK) FSK is similar to FM except the

frequency alternates between two preset values. 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 Trig In connector. Frequency changes

are instantaneous and phase-continuous.

The internal modulating signal is a square waveform with 50% duty cycle

You can set the

internal FSK rate from 2 mHz to 100 kHz.

Frequency-Shift Keying

Frequency Sweep

Frequency sweeping is similar to FM but no modulating waveform is use

Instead, the internal DSP sets the output frequency based on either a

linear or logarithmic function. In a linear sweep, the output frequency

changes in a constant “hertz per second” manner. In a

logarithmic

sweep

the output frequency changes in a constant “octaves per second” or

“decades per second” manner. Logarithmic sweeps are useful for covering

wide frequency ranges where resolution at low frequencies would

potentially be lost in a linear sweep.

You can generate a sweep using an internal trigger source or an

external hardware trigger source. When the internal source is selected,

the function generator outputs a continuous sweep at a rate determined

by the sweep time specified. When the external source is selected,

the function generator will accept a hardware trigger applied to the rear-

panel Trig In connector. The function generator initiates one sweep each

time Trig In receives a TTL pulse.

Modulating Signal

Modulated Carrier

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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