IEEE 299-2006 pdf download IEEE Standard Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures
4.2 Test plan
A test plan shall be prepared. The plan shall be approved by the owner or owner’s representative prior tothe start of test. Tests shall be performed in accordance with the approved test plan.
The test plan shall include. but shall not be limited to. actual test frequencies. test result pass/fail requirementstest locations, and a proposed equipment list, In addition, requirements for maintenance of a test log and araccepted procedure for making changes to the test plan that mmay arise during testing should be included.
4.3 Calibration
Any piece of equipment, whose operation directly affects the numerical value of the SE, shall be incalibration before any critical measurements are begun. Dates of latest calibration (traceable to a nationastandard) shall be provided and shall be within the calibration cycle of the equipment.
4.4 Reference level and dynamic range
A reference level shall be determined as described in 5.6.4, 5.7.4, and 5.8.4. which address the low.frequency (magnetic), resonant range, and high-frequency (plane wave) measurements. This determinationmay be made as frequently as required by changes in the test configuration. The reference level shall beremeasured at the conclusion of testing at each frequency. The tests since the prior reference levedetermmination shall be repeated if the values have varied by more than + 3 dB.
Each unique equipment configuration used to measure SE shall be demonstrated to have adequate DRDetermination of the DR shall consist of excitation of the receiving equipment with the associatedtransmitting equipment, and demonstration that the equipment remains calibrated (linear) for all levels ofrcceived and transmitted signals that are actually experienced during the test. This demonstration shall beaccomplished by varying the receiver input with a calibrated attenuator external to the receiver andobserving an equal change, in decibels, in the receive system. Alternatively, the input attenuator of theinstrument can be used. In this case, linear operation is present if no change is signal amplitude is observedwhen changing the input attenuator setting. This test shall be done at least once for each test frequency.
The DR shall be at least 6 dB greater than the SE to be measured. DR can most efliciently be determinedduring the reference measurement, Effects of surrounding structure (walls, buildings, etc,) shall be minimized.
4.5 Preliminary shield check procedures
See Annex E for preliminary measurements and repairs
4.6 Test/witness personnel
It is not desirable to have personnel within the shielded enclosure during testing. lf required, a maximum oftwo (2) people is allowed within the shielded enclosure. This is intended to allow a tester and a witness.
5. Detailed procedures
5.1 Background
This clause contains the detailed procedures for the SE measurements. This standard defines a testprocedure but does not define the frequencies at which the measurements should be made, nor does it
IEEE 299-2006 pdf download
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