DI-770 Oscilloscope provides five virtual instruments in one

DI-770 and WINDAQ/Scope Manual
When the measurement is running, the software will constantly monitor whether a new sample is measured. If a new
sample is measured, it is obtained from the hardware acquisition memory and displayed on the display. This will continue
until the measurement is ready.
Note: At certain sample speeds and/or relatively slow computers, it might occur that the software can't keep up with
the hardware, in other words, the software misses samples the hardware has measured and stored. This is only a
minor problem. The software detects that it has missed samples and will warn the user by lighting up a red LED in the
display and displaying a warning message in the hint bar.
Note: The missed sample in the record is filled with the value of the previous sample.
Note: Trying to reload the missed sample(s) would take so much time, that again samples would be missed.
When the total measurement is ready, the software will reload the complete measured record from the hardware
acquisition memory and display it.
Hint: There are a few things to make the software keep up with the hardware longer:
- make the data logger window as small as possible
- Select Scan mode instead of Roll mode
- Do not show references while measuring
- close all other applications (especially applications in DOS windows)
- Set the Windows video driver to display up to 256 colors instead of True color or High color
Displaying channels
The two channels can be measured in several different ways:
Ch1
Ch2
Ch1 and Ch2
only channel 1 is measured and displayed
only channel 2 is measured and displayed
channel 1 and channel 2 are measured and displayed simultaneously
Selecting which way to measure the channels can be done using the Measure menu.
When only one channel is measured, the controls of the other channel are disabled or removed from the display.
Setting up a channel
Setting up a channel in the data logger is done in the same way as in the oscilloscope. The only difference is that in
the data logger no auto ranging for the input sensitivity is available.
For information on setting up a channel, see chapter 2, the oscilloscope.
Setting up the time axis
The time base in the data logger is almost the same as in the oscilloscope. However, the data logger has no pre trigger
setting.
Therefor only the items that differ from the oscilloscope time base settings are discussed here.
Setting up the sample speed
The data logger measures a number of samples with a certain time between two samples. This results in a total measure
time of (number of samples x time between two samples).
To setup the timing characteristics of the data logger measurement, open the data logger measurement speed dialog.
The dialog can be opened by activating the choice Sampling speed... from the Time base menu.
In the upper part of the dialog a selection has to be made how the timing characteristics of the data logger measurement
have to be set. There are three possible ways:
The Data Logger
56