DI-770 Oscilloscope provides five virtual instruments in one

DI-770 and WINDAQ/Scope Manual
Continuous measuring can be switched on by activating the play button or pressing the key.
Storing measurement values on disk or paper
The voltmeter can store measurements on disk or print them. This is done in a completely different way than the other
instruments.
The voltmeter can be set to measure (acquire) at fixed times. The measured value will then be stored on disk or sent
to the printer.
The time at which measurements are taken is not 100% guaranteed. The reason for this is the Windows environment
which is not a real-time multitasking system. Because of this there is no guarantee that the time between two measurements
is the set interval. If this occurs, close all windows programs except the voltmeter and then try again.
Setting the time between two measurements
By activating the choice Time from the Acquisition menu, the time between two measurements can be set. A dialog
box appears in which the time in seconds can be entered.
Note: When a time shorter than 0.5 seconds is entered, the acquisition speed is determined by the changes of the displays.
Setting the hysteresis
With an acquisition time smaller than 0.5 seconds, the acquisition speed is determined by the changes in the displays.
It can occur that the input signal has a value just between two displayable values. In that case the display will constantly
change between the two values. To avoid a constant storage to disk or printer in that case, a hysteresis can be
set. Only when the input value change exceeds the hysteresis value, the input value will be stored.
By activating the item Hysteresis from the Acquisition menu, a dialog appears in which the hysteresis can be entered.
The hysteresis is entered as a percentage of the last measured value. With each new measurement, the size of the hysteresis
in volts is recalculated.
The hysteresis can only be set with an acquisition time smaller than 0.5 seconds.
Start an acquisition
By activating the choice Write data from the Acquire menu, a menu is shown with which a selection can be made to
write to disk or printer.
The choice Disk will cause the measurement data to be stored on disk. After activating the choice, a save dialog
appears in which the drive, directory and name of the file can be typed. If the typed file already exists, an overwrite
prompt will appear. The measuring will start after this. At fixed times a measurement is taken and stored on disk.
Measuring can be aborted by pressing the cancel button.
The choice Printer will cause the measurement data to be written to the printer. After activating the choice, a print dialog
appears from which a printer can be selected. A dialog will appear in which the title of the job can be typed. Now
measuring starts. At fixed times a measurement is taken and sent to the printer. Measuring can be aborted by pressing
the Cancel button.
The printing and writing can also be activated by pressing the following buttons on the speedbar:
In both modes, the measurement values are preceded by a block of information. In that block is indicated how the
channels are set and how the high, low and relative levels are set. Each measurement is preceded by the time and date
of the measurement.
If a measured value is larger than the selected input range, '-------' is displayed. This will also be stored on disk or sent
to the printer. The date/time format can be set through the program settings dialog.
The Voltmeter
54