IEC 60335-1 Clause 5 Resistive-Capacitive Low Pass Filter

The KP-LP3 Resistive-Capacitive Low Pass Filter is used in measurement circuits where high-frequency components need to be attenuated before the signal is evaluated. In practical laboratory testing, a defined low pass filter helps create a more controlled measurement condition and supports consistent test results.

Unlike a complete test instrument, the KP-LP3 is a passive measurement accessory. It is normally used together with measuring instruments, test fixtures and the DUT connection arrangement defined by the laboratory’s IEC 60335-1 test procedure.

Its main purpose is to provide the required RC low pass filtering characteristic, with a -3 dB roll-off frequency of 5 kHz ±0.5 kHz.

Standard Compliance and Test Purpose

The KP-LP3 is intended for IEC 60335-1 Clause 5 related measurement work. IEC 60335-1 is the general safety standard for household and similar electrical appliances, and Clause 5 is associated with general test conditions and measurement preparation.

In this type of application, the low pass filter is not used to generate a test signal by itself. Instead, it is used as part of the measurement path to limit high-frequency components according to the required filtering condition.

The laboratory should always confirm the exact clause, edition of the standard, connection arrangement and measurement method before use.

Test Principle

A resistive-capacitive low pass filter allows lower-frequency signal components to pass while attenuating higher-frequency components. The KP-LP3 provides a defined -3 dB roll-off point at 5 kHz ±0.5 kHz.

This means the filter begins to reduce signal amplitude around the specified frequency range. For IEC 60335-1 related measurement setups, this helps the measuring system focus on the intended signal range and reduce the influence of unwanted higher-frequency components.

Technical Specifications

Typical Applications

The KP-LP3 is suitable for test environments where a defined RC low pass filtering characteristic is required for IEC 60335-1 related measurements.

Typical users include:

• Household appliance safety laboratories
• Certification and inspection bodies
• Appliance manufacturers
• R&D verification teams
• Quality control departments
• Pre-compliance testing laboratories
• Internal safety test benches for household and similar electrical appliances

Typical application scenarios include:

• IEC 60335-1 Clause 5 related measurement setups
• Signal conditioning before instrument measurement
• Repeatable laboratory measurement configuration
• Test bench integration for household appliance safety verification
• Supporting measurement consistency during certification preparation

Why a 5 kHz Low Pass Filter Is Used

In appliance safety testing, some measurements require defined filtering before the signal is evaluated. Without suitable filtering, high-frequency noise, switching components or unwanted signal peaks may affect the measurement result.

The KP-LP3 provides a specified 5 kHz ±0.5 kHz -3 dB roll-off frequency, helping laboratories build a more controlled and repeatable measurement setup.

This is especially useful when the test procedure requires the measured signal to be conditioned before being read by the measuring instrument.

Buyer’s Selection Notes

Before ordering the KP-LP3, buyers should confirm the following points:

Practical Value for Laboratories and Manufacturers

For laboratories, the KP-LP3 helps standardize the signal filtering condition in IEC 60335-1 related measurement setups. This supports more consistent test execution and easier documentation of the measurement arrangement.

For manufacturers, it can be used during pre-compliance testing, R&D validation and internal quality inspection before submitting products for formal certification.

For certification-related work, the filter helps reduce uncertainty caused by inconsistent external filtering arrangements, provided it is used according to the applicable laboratory procedure.