Low speed AVR oscilloscope V2.00 (Is updated on 19 Mar 2011)

Step 5 Soldering, calibrations and usage.

Soldering
Solder all components on PCB, starting from the smallest and go on to the biggest component. Check the PCB from soldering side for shortcuts that could have been made during the component soldering. Remember to put IC3 on a base, so the removal for future reprogramming can be done very easily.

Calibrations
If everything is ok, supply the circuit with 12V Dc. On the screen you will see the oscilloscope's raster with a horizontal line on it. Adjust P1 (LCD contrast) with a small screw driver up to the point you will see clearly the content of the screen. If you adjust the P2 you will see that the horizontal line (beam) will be moved up or down depending on the adjustment of P2. Adjust the P2 to set the beam at the center of the screen.

Usage
Connect a 1:10 probe at BNC connector (K1) of oscilloscope. Now you are ready to make your own signal measurements. Take care not to exceed the maximum input voltage which can be up to 24V Ac or 30V Dc on 1:10 selection prob. At 1:1 the maximum input voltage can be up to 2.5V Ac or 5V Dc. S1 gives an extra input voltage division by 2. With S2 you can select between AC or DC input signals.