Active Load: Current Range 0-20A, Voltage Range 0-100V

Q: What is the difference between an active load and a passive load?

An active load uses semiconductor devices to dynamically control current and simulate various load conditions, while a passive load (like a resistor) has a fixed impedance and cannot adjust during operation.

Q: How is an active load used in a Gain Stage machine?

In a Gain Stage machine, the active load tests amplifier performance by applying controlled load conditions to measure parameters like output stability, distortion, and efficiency under different scenarios.

Q: What are common failure modes of an active load?

Common failures include overheating due to inadequate cooling, semiconductor burnout from overcurrent, control circuit malfunctions, and connector wear from frequent use.

Component Specifications

Definition

An active load is a sophisticated electronic component designed to emulate a dynamic or static electrical load for testing purposes. Unlike passive loads (such as resistors), it uses active semiconductor devices (like MOSFETs or transistors) to precisely control current draw, allowing for simulation of various load conditions including constant current, constant resistance, constant power, or dynamic profiles. In a Gain Stage machine, it serves as a critical test component to verify amplifier performance under different load scenarios.

Working Principle

The active load operates by using a control circuit (often with operational amplifiers) to regulate the current through a power semiconductor based on an input reference signal. It adjusts its impedance dynamically to maintain a specified load condition (e.g., constant current), enabling precise testing of power sources or amplifiers by simulating real-world load variations without physical resistor changes.

Materials

Semiconductor materials (silicon for MOSFETs/transistors), copper for conductors, FR-4 for PCB substrate, aluminum or steel for heat sinks, and plastic/composite for housing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Accuracy	±0.5% of full scale
Current Range	0-20A
Response Time	<1ms
Voltage Range	0-100V
Cooling Method	Forced air or liquid cooling
Control Interface	Analog/Digital (e.g., 0-5V, PWM)
Max Power Dissipation	Up to 500W

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IEC 61010-1

Parent Products

This component is used in the following industrial products

Gain Stage

An amplification stage within an operational amplifier that increases signal amplitude.

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Pin Electronics / Driver-Sensor Cards

Electronic interface cards that provide signal generation, measurement, and switching capabilities for testing semiconductor devices in automated test equipment.

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Engineering Analysis

Risks & Mitigation

Overheating leading to component failure
Electrical shock from high-voltage operation
Inaccurate load simulation due to calibration drift

FMEA Triads

Trigger: Insufficient cooling or blocked airflow
Failure: Thermal shutdown or permanent damage to semiconductors
Mitigation: Implement temperature monitoring, use redundant cooling systems, and ensure proper ventilation

Trigger: Control signal interference or noise
Failure: Erratic load behavior or inaccurate current regulation
Mitigation: Use shielded cables, add filtering circuits, and follow EMI/EMC compliance standards

Trigger: Mechanical stress on connectors
Failure: Intermittent connections or open circuits
Mitigation: Use robust connectors, perform regular inspections, and follow proper handling procedures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Current regulation within ±0.5%, voltage compliance within ±1%

Test Method

Calibration per manufacturer specifications using precision multimeters and reference loads; performance verification under simulated load cycles

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Active Load

Manufacturer profiles associated with Active Load.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between an active load and a passive load?