DI-770 Oscilloscope provides five virtual instruments in one

DI-770 and WINDAQ/Scope Manual
To select a windowing function, press the Window button ( ) or select the item FFT window function... from
the Settings menu. A dialog will appear in which the requested window can be selected. A graphic display will show
effect of the windowing function on the sampled signal.
The available window types are:
rectangular (all data is not changed)
Hanning (sinusoidal)
Hamming (sinusoidal)
Bartlett (sinusoidal)
Blackman (triangular)
Parzen (triangular)
Performing measurements
When all settings are made, measurements can be made.
Start and stop measuring
To avoid a new screen of measurement data replacing an old screen, measuring an displaying of data can be stopped.
This can be done in several ways: by pressing the Pause button (
), by pressing the key of by activating the
item Stop continuous measuring from the Measure menu.
When measuring is stopped, the latest measured data will remain on the screen. The Pause button changes to a Play
button ( ) and the One shot button ( ) becomes available.
The measured signal can now be examined.
Single measurements
To perform a single measurement, press the One shot button, press the key of activate the Perform a single measurement
item from the Measure menu. When in the Spectrum analyzer averaging is selected, there will be performed
as many measurements as there are set for the averaging and then measuring will stop.
Continuous measuring can be started again by pressing the Play button, the key or the item Start continuous measuring
from the Measure menu. The One shot button will be disabled again.
Averaging
When a noisy signal is measured, the influence of the noise can be eliminated by averaging several spectra. The noise
component(s) will disappear and the actual signal remains.
Averaging can be switched on by selecting the item Perform averaging of from the Measure menu. In the next menu a
number of measurements can be selected that have to be averaged. The item 1 measurement will switch off averaging.
When averaging is set to e.g. 20 measurements and the spectrum analyzer is set to Pause, pressing the One shot button
will result in taking 20 measurements which are averaged
Measuring maximum values
The spectrum analyzer can be set to measure and display only the maximum values of the spectral components. After
a number of measurements the highest value of each spectral component is displayed then.
To enable measuring maximum values, enter the Measure menu and select the choice Measure max values. A check
mark in front of the menu item indicates whether measuring maximum values is switched on or off.
The Spectrum Analyzer
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