# The main GUI program

Start Applications->Education->ExpEYES-junior from the menu. A four channel oscilloscope screen with several extra features will open as shown in the figure. Various experiments can be selected from the menu.

The ExpEYES-Junior main GUI

The main window looks like a low frequency four channel oscilloscope, with some extra features, on the right side panel. Applications for various experiments can be selected from the pulldown menu. A brief description of the oscilloscope program is given below.

- Any of the four inputs (A1, A2, IN1 or IN2) can be enabled using the corresponding checkbox. The input range can be selected by clicking on the menubutton on the right side of the checkbox. Select the desired input range from the popup menu.
- There is another checkbox, to enable mathematical fitting of the data using V=V0sin(2π f t+θ) +C to show the amplitude and frequency.
- The horizontal scale (time base) can be changed by a slider, from 2 mS fullscale to 500 mS full scale.
- The Checkbutton Freeze, allows to pause and resume the oscilloscope operation.
- The Trigger level can be set by a slider, and there is a menubutton to select the trigger source.
- To save the traces to a file, edit the filename and click on the SaveTo button.
- Clicking on FFT shows the frequency spectrum of all the eneabled channels, appears on popup windows.

In addition to the Oscilloscope, there are several measurement/control options available on the GUI, they are explained below.

- If selected, the voltages at the inputs A1, A2, IN1 and IN2 are sampled every second and displayed.
- The resistance connected between SEN and Ground is measured and displayed every second.
- Clicking Capacitance on IN1, measures the value of the capacitor connected between IN1 and GND.
- Clicking Frequency on IN2, measures the frequency of an external digital (TTL standard) pulse connected to IN2
- SQ1 can be set using the same method as explained above.
- The programmable volages PVS also set in a similar manner.
- Checkbuttons are provided to control OD1 and CCS.