JJF 1155-2006Calibration Specification for Absorbing Clamp in the Range of 30MHz to 1.0GHz (English PDF)

1 Scope (1)

2 References (1)

3 Terms and measurement units (1)

4 Overview (1)

4.1 The purpose of absorbing forceps (1)

4.2 The structure of the absorbing clamp (2)

5 Measurement characteristics (2)

6 Calibration conditions (3)

7 Calibration items and calibration methods (4)

8 Calibration result expression (7)

9 Recalibration interval (8)

Appendix A Calibration Record Content (9)

Appendix B Contents of the inner page of the calibration certificate (11)

Appendix C Working Principle of Absorption Clamp and Emission Equivalent Circuit (14)

Appendix D Examples of Uncertainty Evaluation (18)

30MHz~1.0GHz Absorption Power Clamp Calibration Specification

1 Scope

This calibration specification is applicable to newly manufactured, purchased, in-use and repaired adjustments. The frequency range is (30~

1000) MHz Absorption power clamp that meets the requirements of GB/T 6113.1-1995 and GB/T 6113.2-1998 (Absorption clamp) calibration.

2 References

GB/T 6113.1-1995 Radio disturbance and immunity measurement equipment specification GB/T 6113.2-1998 Radio disturbance and immunity measurement method GB/T 4365-2003 Electromagnetic compatibility CISPR16-4-2.2003Specificationforradiodisturbanceandimmunitymeasuringappa-ratusandmethodsPart 4-2Uncertainties,StatisticsandlimitmodelingMeasurement instrumentationUncertainty Tim Wiliams, GeoffOrfordtheUK'sNationalMeasurementLaboratoryElec-tromageticsPublications"Calibrationanduseofartificialmainsnetworksandabsorbing clamps" when using this specification, you should pay attention to using the currently valid versions of the above cited documents.

3 Terms and units of measurement

3.1 Absorbing clamp for equipment with a power cord, its interference capability can be used as a radiating antenna power cord (only refers to the that part) to measure the energy provided. This power is approximately equal to what the absorption device can absorb when placed around the lead Maximum power. This absorption device is called absorption clamp or ferrite clamp.

3.2 Absorption clamp insertion loss the insertion loss of the absorbing clamp is the fitting between the absorbing clamp and the calibration lead between the coaxial connectors C1 and C2 in Figure 7.1 of this specification.

The unit of loss is decibel and the symbol is dB.

3.3 Correction factor of absorption clamp the correction factor of the absorbing clamp is the difference between the insertion loss of the absorbing clamp and 17, the unit is decibel and the symbol is expressed in dB. 17 it is the approximate value of 10log50, which is the conversion factor between dB (µV) and dB (pW) in a 50ohm measurement system.

4 overview

4.1 Purpose of Absorbing Forceps