Fabric Anti-Electromagnetic Radiation Performance Tester

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The Fabric Anti-Electromagnetic Radiation Performance Tester is a precision instrument designed to measure the electromagnetic shielding effectiveness of various materials, including textiles, plastic sheets, metal foils, coatings, platings, conductive films, metal meshes, conductive glasses, and conductive medium plates. The tester employs the coaxial test method, providing high accuracy and reliable results for full-frequency, list, and point-frequency measurements.

Type: Electromagnetic shielding performance tester (coaxial method)

Application

This tester is widely used for:

Evaluating shielding performance of electromagnetic shielding fabrics for garments and protective materials.

Testing coatings, conductive films, and metal meshes for electronics, aerospace, and automotive applications.

Assessing absorptive and reflective properties of planar materials against electromagnetic waves.

Research and development of EMI/EMC compliant textiles and composite materials.

Quality control in textile manufacturing and material certification labs.

Standards

GB/T 23326 – Electromagnetic shielding textile test standard (China)

GB/T 25471 – Electromagnetic shielding material testing method (China)

ASTM D4935 – Standard test method for measuring the electromagnetic shielding effectiveness of planar materials using a coaxial transmission line

SJ2054 – Coaxial method for conductive materials (China)

Features

(1) Uses coaxial test method, ensuring high transmission characteristics and testing accuracy.

(2) Supports full-frequency scanning, list scanning, and point-frequency measurements.

(3) Automatic control of signal emission and reception, data collection, curve display, and micro-printer output.

(4) Evaluates both absorption and reflection performance of planar materials.

(5) RS232 interface for computer connection, curve display, data analysis, and storage.

(6) USB interface for mobile data storage via flash drives.

(7) User-friendly interface with automated measurement and data processing.

Technical Parameters

1. Signal Source

Parameter	Specification
Frequency Range	300 KHz – 3000 MHz
Frequency Stability	≤ ±5×10⁻⁶
Frequency Resolution	1 Hz
Signal Purity	≤ -65 dBc/Hz (10 KHz offset)
Output Level	-45 dBm – +10 dBm
Level Accuracy	±1.5 dB
Harmonic Suppression	≥30 dB (1 MHz–3 GHz), ≥25 dB (300 KHz–1 MHz)
Directivity	≥50 dB
Power Scanning	-8 dBm – +5 dBm
System Impedance	50 Ω

2. Receiver

Parameter	Specification
Frequency Range	300 KHz – 3000 MHz
Resolution Bandwidth	100 Hz – 20 KHz
Dynamic Range	≥95 dB (RBW = 1 KHz)
Maximum Input Level	+10 dBm
Input Damage Level	+20 dBm (DC +25V)
Standing Wave Ratio	≤1.2

3. Phase Characteristics

Parameter	Specification
Phase Resolution	0.01°
Phase Trajectory Noise	0.5° @ RBW 1 KHz; 1° @ RBW 3 KHz

4. Transmit and Receive Frequencies

Parameter	Specification
Transmit Frequency	20 MHz – 1.3 GHz
Transmit Frequency Drift	<1000 Hz
Minimum Hopping Interval	1 MHz
Transmit Output Power	>13 dBm
Receive Power Dynamic Range	+5 dBm – -55 dBm
Receiver Power Accuracy	±1 dB
Resolution	0.01 dB
Receiver Frequency Test Range	10 MHz – 3 GHz
Double-layer Shielding Effectiveness	>20 dB

5. Specimen Dimensions

Parameter	Specification
Circular Specimen	Diameter 180–200 mm
Square Specimen	180×180 mm – 200×200 mm
Thickness	0–5 mm

6. Instrument Specifications

Parameter	Specification
Working Environment	0–40°C, 0–75% RH
Power Supply	AC 220V ± 30V, 50 Hz, 100 W
Dimensions	70×50×75 cm (L×W×H, excluding computer)
Weight	Approximately 75 kg

Accessories

Main unit (coaxial testing module)

Branded computer for data analysis

Branded printer for reports

RS232 and USB cables for data transfer

Test Procedures

Prepare specimen according to dimensions (circular or square).

Mount specimen in coaxial test holder.

Select measurement mode: full-frequency, list, or point-frequency.

Start the automated signal emission and reception cycle.

Observe shielding effectiveness curves on LCD or computer software.

Print results using the built-in micro-printer or export data via USB.

Repeat as needed for multiple specimens.

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