Text preview for : 5091-6310E.pdf part of HP 5091-6310E HP Publikacje 5091-6310E.pdf
Back to : 5091-6310E.pdf | Home
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.