GB/T 3241.2-2025 in English
VALIDElectroacoustics—Octave-band and fractional-octave-band filters—Part 2: Pattern evaluation tests
- Issued on:2025-05-30
- Implemented on:2025-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
$364.00
| Standard No: | GB/T 3241.2-2025 |
| Document status: | VALID |
| Title in English: | Electroacoustics—Octave-band and fractional-octave-band filters—Part 2: Pattern evaluation tests |
| Title in Chinese: | 电声学 倍频程和分数倍频程滤波器 第2部分：型式评价试验 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2025-05-30 |
| Implemented on: | 2025-12-01 |
| ICS Classification: | 17.140.50-Electroacoustics |
| Chinese Classification: | A59-Acoustic Measurement |
| Professional Classification: | GB-National Standard |
| Related Topics: | Sound pressure octave
frequency doubling material octave peak in Chinese octave peak Octave peak interference Octave peak cancellation Test multiplier signal double frequency radiation peak position frequency doubling wavelength doubling peak wavelength doubling Octave interference emission octave peak Acoustic octave spectral doubling Ploidy score multiplier generation |
《GB/T 3241.2-2025电声学 倍频程和分数倍频程滤波器 第2部分：型式评价试验》由TC23（全国电声学标准化技术委员会）归口，主管部门为工业和信息化部（电子）。
Introduction
Technical Evolution and Background of Standards
This standard replaces the type evaluation test part in GB/T 3241-2010. The main technical changes include:
| Revisions | 2010 Edition | 2025 Edition |
|---|---|---|
| Test Items | 5 types of performance tests | 3 types of tests such as overload indicator and power supply check were added |
| EMC test | Basic immunity requirements | Refine the RF field/power frequency field test methods |
| Uncertainty | No explicit requirements | 95% inclusion probability assessment is mandatory |
Analysis of Core Test Requirements
1. Relative Attenuation Test
Requires completion with a signal generator:
- Test frequency range: lowest center frequency × 0.5 ~ highest center frequency × 1.5
- Sampling density: ≥ 24 test points per bandwidth
- Acceptance limit: ≤ 0.3dB for level 1 filter, ≤ 0.5dB for level 2
2. Effective Bandwidth Calculation
Use trapezoidal integration method:
Key indicators of electromagnetic compatibility
| Test items | Test conditions | Acceptance criteria |
|---|---|---|
| Electrostatic discharge | ±8kV contact/air discharge | Functional non-failure |
| Power frequency magnetic field | 80A/m
Note: If the measurement uncertainty exceeds the maximum allowable value (0.15dB for level 1, 0.25dB for level 2), the system needs to be recalibrated. Sample only — not a preview of GB/T 3241.2-2025
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