I.S. EN 60444-1:1999

Committees responsible
National foreword
Foreword
1 Scope
2 Definition of resonance frequency
3 Reference plane and shielding box
4 Principle of measurement
5 Measuring circuit
      5.1 The p-network
      5.2 Accessories of the p-network
      5.3 Associated equipment
6 Method of measurement
      6.1 Initial calibration of the p-network
      6.2 Frequency and resistance measurement
Appendix A - Additional information on accuracy
Annex B (normative) updating of some formulae of Appendix A
Figure 1
Figure 2
Figure 3 - Plot showing the phase change from the value at
           25 O versus reference resistor values from 0 to
           100 O AT 10 MHz, 50 MHz, 100 MHz and 200 MHz.
           Measuring circuit according to, Figure 1 page 4
Figure 4 - Reference resistors and shorting blank
Figure 5a
Figure 5a
Figure A.1
Figure A.2
Figure A.3
Figure A.4
Figure A.5
Figure A.6
Figure A.7
Figure A.8 - A typical phase/frequency variation of an
             adjusted p-network with a 25 O reference
             resistor
Figure A.9 - Typical p-network
Figure A.10 - Detail of network assembly
Figure A.11 - Dimensions of contacting plates and earthed
              shield; x indicates position of rod and disk
              centers of p-network
Figure A.12 - Position of the reference resistor with
              respect to the network contacting plates
Figure A.13 - Other design of a p-network