gatoruss said:
Do you think that these 2 units (the V-223 and the V-225) will be similar enough for the latter's manual to be helpful?
Probably. The nomenclature and general basic operation of oscilloscopes is fairly standard, so once you learn how to operate one, it's very easy to work an unfamiliar one. Even if you don't know what all the specialized features and functions are, the basics--sweep timebase, volts/div, trigger settings and coupling modes--remain pretty much the same.
To get a trace, do the following:
1. Set the Mode for Ch 1.
2. Set the Volts/Div for maximum.
3. Turn the unit on and adjust the Position knob to the right of the CH 1 Volts/Div control until you have the trace centered vertically. If you cannot see a trace, rotate the Intensity knob clockwise to maximum and try again. (some 'scopes have a trace locator button which makes this easier.)
4. Set the Time/Div knob to the middle of the range.
5. Set the coupling mode switch (the lever switch to the right of the input BNC jack) to DC (as in your photo) and then connect a probe. If the probe has a 1x/10x switch, set it to 1x.
5. Set the trigger MODE switch to Auto (it's already set in your photo).
6. Touch the tip of the probe to the Cal 5V terminal and then slowly rotate the trigger LEVEL knob until you get a stable square wave trace.
7. At this point, you can adjust the Time/Div and Volts/div knobs to obtain the desired waveform display.
Have fun!