Teledyne SP Devices ADQ8-8C, Manual

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17-2000 C
2020-09-17
45(50)
ADQ8-8C Manual
17-2000 C 2020-09-17
45(50)
7.9 Record header
7.9.1 Metadata
The record header contains the information described in Table 4 . Example code is available to pack
this information to a header and write to disk. The example C-code defines a struct which reads the
header information from the header buffer.
7.9.2 Record Status
The status parameters indicates if the record was transferred correctly, Table 5 .
Over-range or under-range condition within the data is indicated. Over-range and under-range can
appear at various stages in the signal chain and the result is not easy to predict. A more detailed
description of over-range and under-range is in
Section 7.10 .
# DESCRIPTION REF
a Copy the data to disk for offline analysis. Header is in default format. 7.9.1
b Copy the data to disk for offline analysis. Additional information about e.g. the experiment, is added
to the header.
c Header and data is analyzed in real-time and only requested parameters are stored. 7.9
Figure 35: Data flow through the system
PARAMETER FORMAT DESCRIPTION REF
Record Status Byte Over/under range, FIFO fill factor and lost data. 7.9.2
User ID Byte A user-configurable value to identify the ADQ unit. 7.9.3
Channel Byte The channel number. 7.9.5
Data format Byte Information about data. 7.9.5
Serial number uint32 Serial number of the ADQ digitizer. 7.9.4
Record number uint32 The current record number. 7.9.6
SAMPLE_PERIOD int32 Time between two samples in steps of 25 ps. 4.4
TIME_STAMP uint64 Timestamp of trigger event in steps of 25 ps. 4.4
RECORD_START int64 Time between trigger event and record start in steps of 25 ps. 4.4
Record length uint32 Length in number of samples of data in record. 7.9.8
General purpose
vector uint16 Usage varies with option.
Timestamp reset uint16 Number of times that the timestamp was reset. 4.4.2
Table 4: Header data.
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