Channel Selection
With the three VERTICAL MODE selectors, you can display com
binations of the two vertical channels.
lected, the other two MODE switches are not active. When CH 2
is selected, the middle MODE switch (NORM/CH 2 INVERT) be
comes active.
And when BOTH channels are selected for dis
play, all three MODE selectors are active.
ADD and INVERT
Select ADD mode to display the algebraic sum of the CHI and
CH 2 signals. When you use ADD, the CH 1 and CH 2 VOLTS/
DIV settings should be equal.
Selecting CH 2 INVERT causes the polarity of the CH 2 waveform
to be inverted.
This allows you to see the difference between
CH 1 and CH 2 signals on the ADD trace.
CHOP or ALT?
When BOTH channels are selected, the display is time-shared.
The CHOP mode displays each channel for a short time and mul
tiplexes during the sweep to give the appearance of displaying
both channels at once.
ALT for sweep speeds slower than 1 ms per division and for
low-repetition-rate signals that make the display flicker (up to 2
p.s/division).
The ALT mode displays each channel for the duration of a com
plete sweep.- It gives a cleaner display of multiple channels than
CHOP does and is usually preferred at moderate to high sweep
speeds.
Certain trigger conditions, including composite trigger selection,
can cause a display that implies a phase relationship or even
synchronization of independent waveforms. If in doubt about the
relative timing of CH 1 and CH 2 signals, experienced operators
set the TRIGGER SOURCE to either CH 1 or CH 2.
2205 Operator' s
When Channel 1 is se
This mode (CHOP),works better than
Operation