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On many production cleaning lines, sweep and pulse are treated as secondary generator settings, but they often determine whether a basket of parts comes out uniform or requires rework. Sweep changes how the ultrasonic frequency is distributed across the tank, while pulse changes how often the ultrasonic field is applied. Each solves a different problem, and many industrial generators allow both to be active at the same time. Understanding the distinction helps you avoid changing chemistry or temperature when the real variable is the way acoustic energy is delivered to the part [1].

What Sweep Mode Does in an Ultrasonic Generator

A fixed-frequency ultrasonic generator drives the tank transducers at a single selected frequency, such as 20 kHz, 40 kHz, or 80 kHz. At a fixed frequency, the sound field can form standing-wave patterns inside the tank: some zones experience high acoustic pressure while others sit in a low-energy dead zone. Parts in the high-energy bands may show cavitation erosion or visible marking, while parts in the dead zones remain contaminated [2].

Sweep mode—also called frequency sweep, sweep frequency, or frequency modulation—moves the generator frequency back and forth around the selected center frequency inside a controlled bandwidth. That continuous shift moves the standing-wave pattern, so no single part location stays under the same high-intensity node for the entire cycle. The result is a more even distribution of cavitation energy across the tank and basket [1][2].

Sweep does not change the base frequency. A 40 kHz sweep generator still produces 40 kHz-area cavitation; it simply varies the instantaneous frequency within a small window. If parts are being damaged or not cleaned, the first question is usually whether the selected base frequency is appropriate for the substrate, not whether sweep is on [1].

Sweep operates around a selected base frequency, so the base frequency still sets cavitation energy and substrate response. <Wie man die Frequenz für Ultraschallreinigungsgeräte auswählt?> covers how 20 kHz, 40 kHz, and 80 kHz differ in bubble size, impact force, and part compatibility.

Waschkörbe, die im Reinigungsprozess verwendet werden

What Pulse Mode Does in an Ultrasonic Generator

Pulse mode leaves the frequency alone and cycles the ultrasonic drive on and off at a defined repetition rate or duty cycle. During the on interval, transducers build the cavitation field; during the off interval, the field collapses, dissolved gas can diffuse out of the liquid, and fresh cleaning solution can move back into blind holes and small gaps. Because the transducer is not driven continuously, average acoustic power and heat input are lower [3].

Pulse settings are normally expressed as on time, off time, or duty cycle. If a process uses 0.5 seconds on and 0.5 seconds off, the average ultrasonic power is roughly half that of continuous operation at the same amplitude. That does not reduce the instantaneous cavitation intensity during the on interval; it reduces the total energy delivered over time [3].

Pulse mode is especially useful for thin-walled parts, polished surfaces, coated components, and materials that are sensitive to cavitation erosion. The off period also allows liquid to replenish in recessed areas, which can improve consistency in blind holes compared with a continuous field that traps gas and debris [3].

Ultraschallreiniger mit Mehrkammern

How Sweep and Pulse Affect Cavitation and Cleaning Results

It helps to think of sweep as a spatial correction and pulse as a temporal correction. Sweep reduces the risk of the same part seeing persistent high-intensity cavitation at a single node. Pulse reduces the average energy input and creates repeated bursts of cavitation that can be easier to control for delicate parts [2][3].

Parameter	Sweep Mode	Pulse Mode
Primary control	Instantaneous frequency around a selected center	Ultrasonic output on/off and duty cycle
Main effect	Moves standing-wave nodes; improves tank-wide uniformity	Reduces average power; controls heat and cavitation bursts
Typischer Einsatz	Dense baskets, mixed geometries, banding marks, large tanks	Thin parts, polished surfaces, blind holes, coating-critical parts
Key variables	Center frequency, sweep bandwidth, sweep rate	On time, off time, duty cycle, repetition rate

Sweep and pulse are not opposites. Many precision cleaning processes use both at once: sweep keeps the acoustic field evenly distributed, while pulse limits how much energy reaches fragile surfaces over the full cycle. The correct combination is process-specific and should be validated with foil erosion tests, particle counting, or a gravimetric cleanliness check, not copied from an unrelated line [4].

Waschkörbe, die im Reinigungsprozess verwendet werden

How to Choose Sweep vs Pulse for Your Parts and Process

Start with the failure mode. If parts come out with clean and dirty zones, visible banding, or erosion that follows a tank pattern, sweep is the first variable to evaluate. Dense baskets and mixed part geometries magnify standing-wave problems because the load changes the local acoustic impedance [2].

If parts are deformed, etched, or heated too much, or if thin-walled components fail under continuous cavitation, pulse mode is the first variable to evaluate. Reducing the effective duty cycle can preserve cleaning aggressiveness during the on window while lowering the total energy delivered per minute [3].

For most production loads, the practical starting point is a controlled baseline, not a single universal recipe. Run a foil test on representative parts, record sweep bandwidth, pulse on/off time, power, temperature, and chemistry batch, then change one variable at a time. This approach separates generator effects from detergent, temperature, and loading effects [4].

Generator modes are only one variable in a production cleaning line. <Die Wahl des richtigen Ultraschallreinigungssystems für Ihre Fabrik> covers tank configuration, material handling, and throughput requirements that affect repeatable cleaning results.