Dataman 520 Series - Manual (Page 38)

DATAMAN 520 series oscilloscope with rollmode
User’s Guide
6.1. File contents
The main part of the file contains data measured by the oscilloscope. Also the
following data defining the oscilloscope’s setup are present:
- Vertical shift of channel A
- Vertical shift of channel B
- Attenuation of the probe connected to input of channel A
- Attenuation of the probe connected to input of channel B
- AC/DC switch setting on channel A
- AC/DC switch setting on channel B
- Position of zero, channel A
- Position of zero, channel B
- Sampling frequency
- Sensitivity of channel A
- Sensitivity of channel B
In addition to these information, there are two special indicators to indicate the ARM
and OVERRUN conditions of data acquisition.
6.2. Data format
The samples are represented as the 8 bit values with valid data range from 1 to 255.
TIP: The value 0 for acquired data is invalid. It is used to indicate the field of
special information.
The samples are stored chronologically in order of sampling. Channel B is first.
The special indicators are stored in the place of occurrence. There are two
special indicators, both are 16 bit wide:
ARM: 0x0002 (this indicator is stored in 16 bit word as 02 00, because the Big
Endian method is used.).
OVERRUN: 0x0001 (this indicator is stored in 16 bit word as 01 00, because
the Big Endian method is used.).
6.3. The oscilloscope settings
All oscilloscope settings are stored as the array of 16 bit words. The structure of the
array is as follows:
0x0000 – Beginning of the oscilloscope settings field.
LNG - Length of the structure including field indicator in 16-bit wide words.
CODE - Setting code
DATA - Data for described setting
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