File format:Tektronix WFM
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The Tek WFM format is a special format used by TDS Series scopes. It uses less space than the CSV/Matlab export functions provided.
Header
| Bytes | Field |
|---|---|
| 0 - 1 | Magic Bytes |
| 2 - 5 | Format Code |
| 6 | Length of Data, Unsigned integer (so far always 4) |
| 7 - 11 | Number of bytes following |
| 12 - 15 | Another Magic |
| 16-20 | Length of Header + Data (big endian, signed integer) |
| 21 - 28 | Vertical Position (Double) |
| 29 - 36 | Horizontal Position (Double) |
| 37 - 43 | Vertical Zoom (Double) |
| 44 - 51 | Horizontal Zoom (Double) |
| 52 - 53 | Acquisition Mode (signed integer, currently unknown) |
| 54 - 55 | Min Max (unknown) |
| 56 - 63 | Duration in seconds (double) |
| 63 - 64 | Vertical Coupling (signed integer) |
| 65 - 66 | Horizontal Unit (signed integer) |
| 67 - 74 | Horizontal time per point (double) |
| 75 - 76 | Vertical Unit (signed integer) |
| 77 - 84 | Vertical Offset (double) |
| 85 - 92 | Vertical Position (double) |
| 93 - 100 | Vertical Gain (double) |
| 101 - 105 | Record length (unsigned integer) |
| 106 - 107 | Trigger Position (signed integer), possibly in points |
| 108 - 109 | Header Version (signed integer) |
| 110 - 111 | Sampling Density (??) (signed integer) |
| 112 - 113 | Burst Segment Length (signed integer) |
| 114 - 115 | Waveform Source (signed integer) |
| 116 - 121 | 3x Video 1 (signed integer) |
| 122 - 129 | Video 2 (double) |
| 130 - 131 | Video 3 (signed integer) |
| 131 - 163 | Preamble (???) |
Data
Waveform data. Length of this segment is stored in Record length.
To reconstruct the waveform use the following:
y = data[i] * vertgain / 25 / 256 + vertoffset - vertposition * vertgain
x = (i - (reclength*trigpos/100)) * horizscaleperpoint