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Raymond EMC Enclosure Ltd.

TP XX-XXX-XXX

R.F. Shielding Effectiveness

Test Procedure

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PREPARED FOR: Raymond EMC Client

PREPARED BY: Raymond EMC Enclosures Ltd. 5185 Dolman Ridge Road Gloucester, Ontario SUBMITTED BY: ________________________ Raymond EMC Enclosures Ltd. DATE: DD-MM-YYYY

Raymond EMC Enclosure Ltd.

TP XX-XXX-XXX

R.F. Shielding Effectiveness

Test Procedure

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Table of Contents

A. Introduction 4

B. Applicable Documents 4

C. Electrical Isolation 4

D. R.F. Shielding Effectiveness Performance Requirements 4

E. R.F. Shielding Effectiveness Procedure 5 E.1. Reference Measurement 5 E.2. Test Point Measurement 8 E.3. Verification 11 E.4. Test Point Location 11 E.5. Frequency Accuracy 11 E.6. Calibration 11

F. Test Personnel 11

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A. Introduction

This document will outline the procedures that shall be used to determine the R.F. shielding effectiveness of a walk-in R.F. shielded enclosure. Diagrams and descriptions of test equipment setup for reference level establishment and shielding effectiveness measurements are included. Upon completion of the preceding tests, Raymond EMC will provide a test report, including copies of test data, as part of the Project Records Document to the Technical Authority.

B. Applicable Documents

The shielding effectiveness tests will be performed in general compliance with the following specifications and documents:

• This Test Procedure

• ITSG-02 Criteria for the Design, Fabrication, Supply, Installation and Acceptance Testing of Walk-In, Radio-Frequency Shielded Enclosures – December 1999.

• The Project Specification

C. Electrical Isolation

The shield must be isolated from all grounds except for the dedicated ground wire. This will be verified prior to beginning any of the R.F. shielding effectiveness testing.

D. R.F. Shielding Effectiveness Performance Requirements

R.F. shielding effectiveness, which is the performance criterion of an R.F. shielded enclosure, is defined as the reduction in the amount of electromagnetic energy, when measured in decibels (dB), which results from the introduction of the shield. This reduction of electromagnetic energy is commonly referred to as attenuation. The calculated attenuation can be represented as:

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Attenuation (dB) = 20 Log E1/E2 Where: E1 = Field intensity generated on one side of the shield. E2 = Field intensity received on the other side of the shield. The required test frequencies, antenna types, antenna seperation and attenuation levels are listed below:

Frequency Antenna Type

Antenna Seperation

Required Shielding

Effectiveness

10 kHz Loop 1m 55 dB

200 kHz Loop 1m 95 dB

1 MHz Loop 1m 100 dB

400 MHz Dipole 1m 100 dB

1 GHz Dipole 1m 100 dB

10 GHz SG Horn 1m 100 dB

H = Magnetic Field PW = Plane Wave

Table 1. Required R.F. Shielding Effectiveness Levels

E. R.F. Shielding Effectiveness Procedure

This procedure describes the method of testing which will be utilized to evaluate the shielding effectiveness of the subject enclosure.

E.1. Reference Measurement

Prior to taking a shielding effectiveness measurement, a reference level and a dynamic range shall be established as follows:

• Both the source antenna and the receiving antenna shall be placed outside the enclosure, and separated as shown in figures 3 to 9. Where it is impractical to use this spacing a shorter distance may be used, provided that the distances from the enclosure wall to the source and receiving antennas are identical.

• With the source turned off, the received noise level shall be noted. Maximum attenuation shall then be inserted in the signal path, and the source turned on. Attenuation shall be gradually decreased until the recieved-signal-plus-noise-level is at least four times the level of received noise alone. This procedure sets the reference level at least 6dB above the received noise level. The attenuation setting shall be noted.

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Figure 1. Reference Setup (All Antenna Types)

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Figure 2. Loop Antenna Reference Setup

Figure 3. Dipole Antenna Reference Setup

Figure 4. Horn Antenna Reference Setup

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E.2. Test Point Measurement

Once the reference level has been established and recorded, attenuation testing of the enclosure may proceed.

• The source antenna shall be placed within the RF-shielded enclosure, parallel to the enclosure wall and in the same polarization used to establish the reference level.

• The receiving antenna shall be placed outside of the enclosure, parallel to the enclosure wall. The distance between the source antenna and the receiving antenna shall be identical to that used to obtain the reference level, both antennas shall be equidistant from the shielded surface.

• With the enclosure's doors closed, the source shall be turned on, and the attenuation shall be gradually reduced until the received signal level equals the reference level determined previously. The attenuation settings shall be noted.

• The difference in attenuation settings between the reference measurement and the test point measurement is the shielding effectiveness

• For all measurements, the transmitting and receiving antenna will be correctly positioned and orientated and will remain fixed at each test point for the duration of the measurement. All measurements will be recorded in real time on the Test Data Sheets (see Appendix A).

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Figure 5. Measurement Setup (All Antenna Types)

Figure 6. Loop Antenna Test Measurement Setup

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Figure 7. Dipole Antenna Test Measurement Setup

Figure 8. Horn Antenna Test Measurement Setup

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E.3. Verification

Periodic checks shall be made during the reference and test point measurements to verify linearity, correct tuning, and the absence of saturation, gain compression etc.

E.4. Test Point Location

Test locations for measuring attenuation shall include the following:

• one point for every 2.5m of wall length, as well as at every wall corner, at the mid-point of every 3m increment of wall height;

• one point for every 10 square meters of ceiling and floor;

• at the central point of the single-entry plate;

• adjacent to every air ventilation port;

• at every door and hatch (including at the inner doors RF lockway), with one test per door seam (four for single-leaf doors);

• The total number of test locations may be consolidated where the above requirements produce a close physical duplication.

E.5. Frequency Accuracy

The test equipment shall vary less than +/- 10% from the test frequency.

E.6. Calibration

The receiving equipment used to measure the attenuation of the shield shall be calibrated in accordance with ISO-10012-1 and ANSI/NCIL 7450-1-1994 at least once every six months or immediately after exposure to conditions that might affect calibration, whichever is more frequent.

F. Test Personnel

All testing will be conducted by the on-site Installation Specialist.

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APPENDIX A. Sample Data Sheet

DATA SHEET

SHIELDING EFFECTIVENESS TEST RESULTS

DATE: Project: REMC Job #

TEST TYPE:

[ ] ITSG-02 [ ] Mil Std 285 [ ] IEEE-299 [ ] NSA 65-6 [ ] Other:

Location: Raymond EMC, Ottawa, ON CANADA Enclosure Type:

[ ] Qualification

[ ]

Acceptance [ ] Other

Frequency Field Test Reference Measured Shielding Required

Point Level Level Effectiveness Effectiveness Comments

(db) (db) (db)

E - Electric Field Transmitter Location: [ ] Inside [ ] Outside

H - Magnetic Field

P - Planewave

MW - Microwave

MMW - Millimeterwave

Other

This Data accurately demonstrates the Shielding Effectiveness of the Shielded Enclosure to this date.

X

Signature of Shielding Test Technician Date Witness Date