Measurement Files¶
The measurement data will be stored in the WAV file format. One WAV file will be created for each active channel.
| Data type | Endian | Length | File offset | Identifier | Value |
|---|---|---|---|---|---|
| BYTE[4] | Big | 4 | 0 (0x00) | bfChunkID | “RIFX” |
| DWORD | Little | 4 | 4 (0x04) | dwChunkSize | Data length - 8 |
| BYTE[4] | Big | 4 | 8 (0x08) | bfRiffType | “WAVE” |
| Data type | Endian | Length | File offset | Identifier | Value |
|---|---|---|---|---|---|
| BYTE[4] | Big | 4 | 12 (0x0C) | bfChunkID | “fmt” |
| DWORD | Little | 4 | 16 (0x10) | dwChunkSize | Data length - 8 |
| INT | Little | 2 | 18 (0x12) | wFormatTag | 0x0001 (PCM) |
| INT | Little | 2 | 20 (0x14) | wChannels | 0x0001 (1 ch.) |
| DWORD | Little | 4 | 24 (0x18) | dwSamplesPerSec | 100 Hz - 50.000 kHz |
| DWORD | Little | 4 | 28 (0x1C) | dwBytesPerSec | Sample rate * block align |
| WORD | Little | 2 | 32 (0x1E) | wBlockAlign | 4 byte |
| WORD | Little | 2 | 34 (0x20) | wBitsPerSample | 32 bit |
| Data type | Endian | Length | File offset | Identifier | Value |
|---|---|---|---|---|---|
| BYTE[4] | Big | 4 | 36 (0x24) | bfChunkID | “data” |
| DWORD | Little | 4 | 40 (0x28) | dwChunkSize | Data length - 8 |
| BYTE[] | Big | Undefined | 44 (0x2C) | bfData | Measurement data |
| Data type | Endian | Length | File offset | Identifier | Value |
|---|---|---|---|---|---|
| BYTE[4] | Big | 4 | 44+sz(bfData) | bfChunkID | “labl” |
| DWORD | Little | 4 | 48+sz(bfData) | dwChunkSize | Data length -8 |
| DINT | Little | 4 | 52+sz(bfData) | dwIdentifier | Identifier |
| BYTE[256] | Little | 255 | 56+sz(bfData) | bfText | „Label Text“ |
The WAV files will be stored in an uncompressed ZIP file at the destination path of CMS_IO_MEASMNT_CTRL. The file names for of the WAV files are given by the FM502_CMS and are directly corresponding to the analog channel and encoder configuration of the FM502_CMS.
Example
With no encoder, the files are named: CH00_nEN.wav, CH01_nEN.wav, … CH15_nEN.wav and stored in a ZIP file.