DI-770 Oscilloscope provides five virtual instruments in one

DI-770 and WINDAQ/Scope Manual
The value can be set by entering a value in the Set relative value edit box. The value has to be entered in volts.
To enable relative measurements, a checkmark has to be placed after Relative measuring. Relative measuring is then
enabled.
Relative measurements can be used with e.g. a temperature measurement. Suppose the output voltage of a temperature
probe at 0 degrees Celsius equals +10 volt. By entering a relative value of 10 volt, the absolute temperature is
directly readable.
Comparison measurements
For displaying the measured and calculated values, 16 methods are available (See: displaying the measured value).
Four of those methods are comparison measurements:
> than HI
< than LO
>< COMP
LO HI
These measurements require a high and a low value. By entering a value in the Set high value or Set low value edit
boxes, the high and low levels can be set.
Note: For easy entering of low and high values, the software does not check whether the high value is larger than the
low value. So it is possible to enter a low value which is larger than the high value. Measurements using these values
will give useless results.
Setting the reference impedance
The dBm and power measurements require a reference resistance. The value of the resistance can be set using the Set
impedance value edit box. The value has to be entered in Ohm. The default value is 600.
Setting the number of digits after the decimal separator
With every calculation done on a measurement, a default number of digits after the separator is set (auto setting). This
number corresponds with the significant number of figures determined by the hardware. The number of digits after
the separator can be changed using the Number precision selector.
Note: The displays have a maximum number of 6 digits. When the value in the display is that large that digits before
the decimal separator can't be displayed, an arrow pointing to the left is displayed left from the first digit. The displayed
digits are correct though.
Sound settings
With comparison measurements, for each value a sound signal can be set. When this is done, the set limits are indicated
audibly.
By activating the choice Sounds from the Settings menu, a dialog appears from which for each display value a sound
signal can be set. For each display value can be chosen from: No sound, 100 Hz, 200 Hz, 500 Hz, 1 kHz, 2 kHz, 5
kHz and 10 kHz.
With the choice No sound, no sound signal is generated with the selected display value.
If you are using the PC speaker or a WAV device, it is only possible to make one sound at a time. This means that the
sound which is played first, is repeated until the condition is invalid. As soon as the condition is invalid, the sound for
the next condition can be played.
Note: If your computer is equipped with a digital playback soundcard (a soundcard which can play WAV files), you
can also play the sounds through your soundcard. Select the sound device pull down after which you can select wav
device from the list. If this option is missing and you have a soundcard, you should install drivers for the soundcard
or you don’t have a digital playback soundcard.
The Voltmeter
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