DI-770 Oscilloscope provides five virtual instruments in one

DI-770 and WINDAQ/Scope Manual
The binary format is built of records of 8 bytes large. The first two bytes are for channel 1, bytes 3 and 4 are for channel
2, bytes 5 and 6 are for reference 1 and bytes 7 and 8 are for reference 2. The two bytes for each channel form a 16
bits value, where 0 represents -sensitivity and 65535 represents +sensitivity.
The ASCII format exists of one line of information for each sample in the record. Each line exists of:
the sample number, related to the trigger point (sample number 0)
the sample time, related to the trigger point (t=0)
the voltage value for channel 1
the voltage value for channel 2
the voltage value for reference 1
the voltage value for reference 2
The items are separated by commas.
The ASCII files can simply be imported in other applications, like e.g. spread sheet programs.
Files in ASCII format are much larger than files in binary format, up to 7 times.
To set the file type, enter the File menu and select the item Data file type. Choose the requested setting from the
menu.
Loading saved measurement data from disk
Previously saved waveforms can be read from disk in the oscilloscope, data logger and the spectrum analyzer. There
are two ways to do this: by activating the Read waveform from disk item from the File menu or by clicking the Read
waveform button ( ).
Both ways will bring up a load dialog in which a drive, directory and file can be selected. When a file is selected and
the OK button is pressed, the waveform will be read from disk.
Each waveform consists of three files: a .DAT file, a .GEG file and a .REF file. If one of these files is missing or the
waveform data is not compatible, an error is generated.
The data file type in which the data is written will be determined by the software and the correct reading functions are
used.
Then the data is read according to the Waveform read method that is set.
After reading the data, the instrument is set to Pause (not required in the data logger) to avoid the data being replaced
by new measured data.
Note: Measurement data stored in the voltmeter can be read in the oscilloscope and the data logger.
The values of display 1 of channel 1 will be placed in channel 1 of the data logger.
The values of display 2 of channel 1 will be placed in Reference 1 of the data logger.
The values of display 1 of channel 2 will be placed in channel 2 of the data logger.
The values of display 2 of channel 2 will be placed in Reference 2 of the data logger.
Setting the Waveform read method
When a waveform is written to disk, all four channels (Ch1, Ch2, Reference 1 and Reference 2) are written to disk.
There are two methods to read waveforms from disk:
Read all signals in file
With this method all signals that were active when the waveform was written are read. If e.g. Ch1 and Reference 2
were active when the waveforms were saved, Ch1 and Reference 2 are read. the data in Ch2 and Reference 1 will
remain unchanged. Ch1 and Reference 2 will be switched on and Ch2 and Reference 1 will be switched off.
Only read current displayed signals
Software
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