Frequency response measurement
The frequency response can be measured with the circuit
below:
 |
| Measure Transformer Frequency Response |
- Rs = impedance of primary
- RL = impedance of load
- E1 = source signal
- E2 = output signal
E1 voltage must be held constant for all frequencies for
frequency response measurement. The output voltage E2 is reference at 1kHz
usually, and the rest of the voltage present at other frequencies are referred
to this reference value for deviation calculation.
The voltage level of all frequencies (intended range) should
lie within +/- 3dB or even +/- 1dB, or to the extreme of +/- 0.5dB or +/-
0.1dB. The -3dB frequency means that it will have a voltage level of 70.7% of
the reference frequency.
The lower limit of the frequency range (bass) is determined
by the primary inductance, as mentioned previously. The upper limit of the
frequency range (treble) is determined by the reactance of the leakage
inductance.
Please refer to the past articles of the primary inductance
versus lower frequency calculation and the measurement of the leakage
inductance.
The impedance of both the primary and secondary windings can
be calculated once the voltage level are known too.
There you have it, basic but useful transformer frequency response measurement.Z1 / Z2 = (E1 / E2) squared
J&K Audio Design
29/12/2013
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