JJF 1886-2020Calibration Specification for Electric Field Probes (English PDF)

1 Scope (1)

2 Reference documents (1)

3 Terms and definitions (1)

3.1 Micro-transverse electromagnetic wave chamber (1)

3.2 Gigahertz Transverse Electromagnetic Wave Chamber (1)

3.3 Site voltage standing wave ratio (1)

3.4 Isotropy (1)

4 Overview (1)

5 Measurement characteristics (2)

5.1 Electric field strength (2)

5.2 Isotropy (2)

6 Calibration conditions (2)

6.1 Environmental conditions (2)

6.2 Equipment for calibration (2)

7 Calibration items and calibration methods (3)

7.1 Calibration items (3)

7.2 Calibration method (4)

8 Calibration result expression (6)

9 Recheck interval (7)

Appendix A Original Record Format (8)

Appendix B: Internal page format of calibration certificate (10)

Appendix C Calibration Uncertainty Evaluation Examples of Major Items (11)

Introduction

This specification is based on JJF 1071-2010 "Rules for the Compilation of National Metrology and Calibration Specifications" and JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" was compiled:

This specification refers to IEEEStd1309-20139kHz~40GHz electromagnetic field probe and sensor (antenna except External) Calibration (CalibrationofElectromagneticFieldSensorsandProbes(ExcludingAnten-nas)from9kHzto40GHz]:

This specification is released for the first time:

Calibration specification for electric field probe

1 Scope

This specification applies to the calibration of electric field probes in the frequency range of 10MHz to 18GHz:

2 Reference documents IEEEStd1309-2013 9kHz~40GHz electromagnetic field probe and sensor (except antenna) calibration [CalibrationofElectromagneticFieldSensorsandProbes (ExcludingAntennas)from 9kHzto40GHz]:

For dated reference documents, only the dated version applies to this specification; for undated references the latest version (including all amendments) is applicable to this specification:

3 Terms and definitions

3.1 Microtransverse electromagnetic wave chamber µtransverseelectromagneticmodecel Microtransverse electromagnetic wave chamber (µtransverseelectromagneticmodecel, hereinafter referred to as µTEMCel) it is a specially designed tiny transverse electromagnetic wave chamber with a symmetrical structure: The outer shell is two aluminum shells tightened with screws:

The inner plate adopts brass plate: µTEMCel can still generate a calculable standard field strength at frequencies up to 1GHz, Used to calibrate a sufficiently small field probe that does not exceed the size of its uniform zone:

3:2 gigahertz transverse electromagnetic wave chamber gigahertztransverseelectromagneticmodecel Gigahertz transverse electromagnetic modecel (gigahertztransverseelectromagneticmodecel, hereinafter referred to as GTEMCel) consists of a tapered, asymmetrical rectangular coaxial line, similar to the input part of TEMCel Extended structure: Reasonably choose the cross-sectional size so that the characteristic impedance along the length of the cell remains at 50ohm: GTEM Cel has a larger operating space than TEMCel:

3.3 Site voltage standing wave ratio the site voltage standing wave ratio is in the microwave anechoic chamber, the electric field probe is placed at the reference point, along the same transmitting antenna the polarization and position of the electric field probe are changed in the direction of the main axis to produce the same standard field:

The large dispersion determines the site voltage standing wave ratio:

3.4 Isotropy

Isotropy characterizes the response of the field probe with the measurement angle, and the polarization and propagation direction of the incident field:

Irrelevant: Isotropy is when the direction of the field probe is changed according to the calibration requirements, the highest indication value of the field probe under constant field strength is the ratio of the lowest indicated value, usually expressed in decibels:

4 overview

The electric field probe is usually composed of three parts: field sensor, detector and high resistance transmission line:

figure 1: The field sensor is used to detect the field component of a certain position in space, and the detected signal can display the field strength after processing

Numerical value: