1-机床移动 26-07-07 16-54-37.txt CH1 W=1.0ms

A = FFT amplitude converted to dB for visualization; it is not instantaneous voltage.
图中虚线为 125kHz、200kHz、250kHz 判断边界，用于评估 500kSPS 原型卡的覆盖风险。

Decision Summary / 决策摘要

分类 / ClassB 边界混合 / B_transition_or_mixed
<=125 kHz81.53%
<=200 kHz83.27%
>250 kHz15.55%
400 kHz-1 MHz12.35%
说明 / NoteB 类：过渡/混合，高频成分需要复核

Metadata

{
  "file": "1-机床移动 26-07-07 16-54-37.txt",
  "channel_index": 1,
  "label": "CH1-广州清诚",
  "sample_rate_hz": 2000000.0,
  "window_ms": 1.0,
  "hop_ms": 1.0,
  "start_s": 0.0,
  "duration_s": 1.2,
  "frames": 1200,
  "freq_bins": 1001,
  "amplitude_unit": "FFT amplitude derived from mV waveform, not instantaneous voltage",
  "report_note": "B 类：过渡/混合，高频成分需要复核"
}