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Effective Multi-tap
Transformer Measurement
using a Scanner and the
Agilent 4263B LCR Meter
Application Note 1224-5
Introduction                                                          Agilent 4263B Transformer
                                                                      Measurement Capability

With the progress of recent electronics equipment and                 The 4263B LCR meter is a low price instrument which
digital networks, production amounts are increasing                   measures the fundamental parameters of LCR components
of the transformers which contribute to equipment                     with speeds as fast as 25ms, at frequencies of 100, 120,
miniaturization, low power dissipation and higher quality.            1k, 10k and 100kHz, In addition, with option 001, the
Therefore, improvement of select estimate efficiency is               4263B measures turns ratio (N), mutual inductance (M)
required at the production line or incoming inspection.               and dc resistance (DCR) which are required for
Noticed recently, improvement of estimation efficiency is             transformer measurement. Figure 1 shows a 4263B
required for pulse transformers which are used in LAN                 simple block diagram for L, M, and DCR measurement.
or ISDN digital networks, and for multi.-tap transformers
with three or more pole taps, such as switching power                 For example, in the inductance-turns ratio (L-N)
transformers. This application note shows an effective                measurement, an ac voltage is applied at the Hcur
multi-tap transformer measurement using a scanner                     terminal. Self-inductance value (L1) is calculated from
and the Agilent 4263B LCR meter.                                      the measured values of V1 and I1. Turns ratio (N) is
                                                                      automatically obtained from the ratio of measured values
                                                                      V1 and V2 (discriminating the polarity simultaneously).

                                                                      In the dc resistance (of L-DCR) measurement, the applied
                                                                      voltage at the Hcur terminal is dc. Dc resistance value
                                                                      (DCR1) is calculated from the measured values V1 and I1.

                                                                      There are, however, the following limitations when using
                                                                      the measurement connection.
                                                                      

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