Operation
Increasing the Sensitivity
Pulling the VOLTS/DIV CAL control out (towards you) magnifies
the vertical axis by a factor of 10, increasing the sensitivity
to 500 |ulV per division. This function is useful for investigating
small-amplitude signals (in general, less than 5 mV p-p) or small-
amplitude details on larger signals.
HORIZONTAL CONTROLS
Sweep-Speed Selection
The unmagnified sweep (MODE set to XI) is the horizontal func
tion needed for most applications. Best measurement accuracy is
achieved by setting the SEC/DIV control for the fastest sweep that
will display the interval of interest. The variable control (CAL)
should be in its detent (fully clockwise).
Magnifying Waveform Details
Each of the two magnified modes— ALT or MAG— expands the
unmagnified trace. When ALT is chosen, both the unmagnified
and the magnified waveforms appear together on the crt screen.
Vertical separation between them is adjusted with the TRACE
SEP control. If MAG is selected, only the magnified trace is dis
played on screen. This is useful for eliminating unwanted clutter
from the crt when you are making accurate timing measurements
or looking at waveform details.
Whenever ALT or MAG is set on the upper HORIZONTAL MODE
switch, the amount of waveform expansion is determined by the
setting of the HORIZONTAL MAG switch located beneath the
SEC/DIV control. Three magnifications are available— 5X, 10X,
and 50X. Having the ability to select various combinations of
waveform expansion and SEC/DIV control setting lets you extend
the time-base range out to a maximum of 5 ns per division.
Appendix A lists the sweep speeds for each magnifications level
at every SEC/DIV control setting.
The marker that links the timing of the unmagnified and magnified
traces with each other is the center vertical graticule line. The
intersections of that line with the unmagnified and the magnified
waveforms are the points of equal time duration from sweep start.
With the center vertical graticule as the reference line, the investi
gation of waveform details around any point on the unmagnified
trace as well as the measurement of time with greater accuracy
then become easy tasks.
2-8 2225 Operators
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