TY-145P secondary load comparison
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Use the article and circuit-contract.json for wiring. The test source is a
zero-offset sine at no more than 1.00 V RMS open circuit. Disconnect output
before touching wires. Keep the battery meter on the secondary electrically
floating. No mains or insulation stress tests.

Copy observations-blank.csv to observations.csv and fill the six rows.
Use volts RMS for all three voltage columns. Only 200/1000/10000 Hz and
meter_only/load_600 are valid. The common winding input range is 0.180–1.200 V
and the open-source worksheet range is 0.200–1.000 V. If a reading falls
outside the range, keep the original reading in the notebook and stop the
analysis for that dataset. Do not fill with a guessed value.

  python3 transformer_load.py observations.csv --load-ohm 600
  python3 transformer_load.py synthetic-readings.csv
  python3 test_actual_program.py -v

Use the measured resistance of the disconnected load pair (588–612 ohms).
The example file is constructed, never measured. Its graph is an illustration
of the output ratios, not a measured frequency-response curve. Each estimate
uses amplitude only. Load power is the resistor power computed from secondary
voltage, not transformer efficiency. The code has no third-party dependencies.
