[2001] Delay Time Information Blockette (36 bytes)

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Presentation transcript:

[2001] Delay Time Information Blockette (36 bytes) This blockette is used to indicate components of the total time correction presented in the Fixed Section of Data Header. SEED reading programs do not determine sample times using this blockette. Data users can check delay time at each data-transfer stage and also estimate precise time, more than 100 micro-sec precision, before applying time correction to raw data using this blockette. Note Field name Type Length Mask or Flags 1 2 3 4 5 6 7 8 9 10 11 Blockette type - 2001 Length of blockette type Data transferred path Delay time at instrument Delay time to node Time difference with GPS Time correction to raw data Unit of the item 4 Unit of the item 5 Unit of the item 6 Reserved bytes B A 2 4 Notes for fields: 1 UWORD: Blockette type [2001]: Time-delay information blockette. 2 UWORD: Byte number of next blockette. 3 CHAR*2: Data transferred path of cable route. Route AA, B1, …, etc. 4 LONG: Delay time at instrument. Unit is written in field 8. 5 LONG: Transfer delay time to station network node. Unit is written in field 9. 6 LONG: Time difference between GPS and record. Unit is written in field 10. 7 LONG: Time correction applied in the record start time. Same value as the field 16 in the Fixed Section of Data Header. Unit is 100 micro second. 8 FLOAT: Frequency (Hz) corresponding to the unit of the field 4. 9 FLOAT: Frequency (Hz) corresponding to the unit of the field 5. 10 FLOAT: Frequency (Hz) corresponding to the unit of the field 6. 11 UBYTE: Reserved; do not use.