Signal Generators

Signal generators are critical tools for testing, designing, and troubleshooting electronic systems. Used across industries like aerospace, defense, telecommunications, and education, these instruments produce electrical waveforms used to simulate signals in RF, audio, and digital systems.

At ValueTronics, we offer a broad selection of new and used signal generators from trusted brands such as Keysight, Tektronix, Rohde & Schwarz, and Rigol. Whether you need a basic function generator for waveform testing or a high-frequency RF signal generator for wireless applications, our inventory includes options for a wide range of testing needs and budgets.

Explore our collection to find the right signal generator, or reach out to our team for expert guidance and support.

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Frequently Asked Questions

What is a signal generator, and what is it used for?
A signal generator is a test instrument that creates electronic signals with specific frequencies, amplitudes, and waveforms. These signals are used to test, calibrate, and troubleshoot electronic circuits, systems, and devices.

Signal generators are commonly used in RF and microwave testing, audio equipment development, telecommunications, and educational labs. Engineers and technicians rely on them to simulate real-world signals, verify circuit behavior, and measure system response under various conditions.
What types of signal generators are available?
There are several types of signal generators, each suited for specific applications:

RF Signal Generators: Produce high-frequency signals used for testing wireless communications, radar, and RF circuits.

Function Generators: Generate basic waveforms like sine, square, and triangle. Ideal for general-purpose testing and circuit development.

Arbitrary Waveform Generators (AWGs): Create custom, user-defined waveforms for advanced simulation and complex signal testing.

Audio Signal Generators: Designed for low-frequency applications such as audio system testing and acoustic measurements.

Pulse Generators: Produce precise timing pulses for triggering or simulating digital signals in logic and timing applications.
How do I choose the right signal generator for my application?
Choosing the right signal generator depends on your specific testing requirements and technical goals.

Frequency Range: Ensure the generator covers the frequency range needed for your application, whether it's low-frequency audio or high-frequency RF.

Waveform Types: Determine if you need standard waveforms, custom signals, or complex modulation capabilities.

Output Power and Accuracy: Consider the signal level, stability, and precision required for your device or system under test.

Modulation Support: If you're working in RF or communications, look for support for AM, FM, PM, or digital modulation formats.

Connectivity and Control: Evaluate interface options like USB, LAN, or GPIB and check for programmable or remote operation features.
Do signal generators come with calibration and certification?
Yes, signal generators used in professional and regulated environments are often available with calibration and certification. Calibration verifies that the instrument meets manufacturer specifications for accuracy and performance, which is important for consistent and reliable test results.

At ValueTronics, many of our new and used signal generators include calibration certificates traceable to NIST standards. Calibration services are also available upon request to support compliance with industry standards such as ISO and ANSI.
What frequency range do signal generators cover?
Signal generators are available in a wide range of frequency capabilities to support various testing needs.

Audio Signal Generators: Typically cover low-frequency ranges from a few hertz up to around 20 kHz, used for audio and acoustic testing.

Function and Arbitrary Waveform Generators: Often operate from a few hertz to several hundred megahertz, suitable for general-purpose electronics.

RF Signal Generators: Can cover frequencies from a few kilohertz up to 40 GHz or higher, used in wireless, radar, and high-frequency communication testing.

The right frequency range depends on your specific application.
Are signal generators available with modulation capabilities?
Yes, many signal generators include built-in modulation features to support a wide range of testing scenarios. Modulation allows the signal generator to alter its output in ways that simulate real-world communication signals or system conditions.

Common modulation types include:
AM (Amplitude Modulation)

FM (Frequency Modulation)

PM (Phase Modulation)

Pulse Modulation

IQ or Digital Modulation (available on advanced RF models)

These capabilities are especially important in RF, telecommunications, and wireless development. When selecting a signal generator, check for the specific modulation formats required for your application.
What is the difference between an RF signal generator and a function generator?
The main difference lies in their frequency range and intended use.

RF Signal Generators: Designed for high-frequency applications, these instruments generate signals in the kilohertz to gigahertz range. They are commonly used in wireless communications, radar, satellite systems, and other RF testing environments. RF generators often include advanced features like modulation, frequency sweeping, and precise output control.

Function Generators: Typically used for lower-frequency applications, function generators produce standard waveforms such as sine, square, and triangle. These are ideal for testing analog circuits, audio systems, and basic electronic components. They are more general-purpose and usually cover frequencies up to a few hundred megahertz.