Now set the VERTICAL MODE switches to BOTH-NORM-ALT and return both
VOLTS/DIV switches to 0.5 V (10X PROBE). Rotate all variable controls clockwise to
their CAL detents. Set the TRIGGER SOURCE switch to VERT MODE. Then use the
VERTICAL POSITION and TRACE SEP controls to position the four traces to
convenient locations on the screen.
While watching the Channel 2 waveforms, set the middle VERTICAL MODE switch to
CH 2 INVERT and notice the effect. Then set the right MODE switch to ADD. What
happens to the waveforms? Finally, return the middle MODE switch to NORM. What
waveform is displayed now?
Congratulations!
You now know how to use the 2225 front-panel controls to display signals and move
them about on the screen. The remainder of this section gives you more information about the controls
and offers suggestions for their use.
3. Display Controls
Set the INTENSITY control for comfortable viewing, but no brighter than you need. Use
high-intensity settings to observe low-repetition-rate signals, narrow pulses in long time
intervals, or occasional variations in fast signals.
4. Vertical Controls
When making voltage measurements, rotate the VOLTS/DIV CAL control fully clockwise
(in detent). Best accuracy can be achieved by setting the VOLTS/DIV control for the
largest display possible.
A. Input Coupling
For most applications use DC input coupling. This mode is compatible with the
standard-accessory, high-impedance probes and it displays logic levels and dc levels
of static signals.
Use GND input coupling to show where the 0-volt level will be located when you shift
to DC or AC coupling.
Use AC coupling for the special cases where you need to see small signals on large
dc voltage levels.
B. Channel Selection
With the three VERTICAL MODE buttons, you can display combinations of the two
vertical channels. When CH 1 is selected, the other two MODE switches are not
active. When CH 2 is selected, the middle MODE switch (NORM/CH 2 INVERT)
becomes active. And when BOTH channels are selected for display, all three MODE
switches are active.
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