Operation
Fundamentals
Like any oscilloscope, this instrument draws a graph of voltage as a function of
time. The
VERTICAL controls, marked off
by
a heavy gray
line,
define the voltage axis
of the
display. SEC/DIV, X10 MAG, and horizontal POSITION control the time axis of
the
display. The TRIGGER controls, marked off by a green box, define the signals
required to initiate sweeps across the time axis. The controls under the CRT affect the
display but not the waveform.
Getting a Display
1.
Connect a probe from the input of a Vertical channel
to
a signal.
2.
Select the channel using the Vertical MODE buttons. You may select any
combination of
vertical channels (if you are using the standard accessory
probes, make sure the
CH
1 and
CH
2 input are not set at 50 [I).
3.
Press AUTO Setup to initialize vertical, horizontal, trigger, and display intensity
for a
usable display. (If STEP
is
illuminated, first push RECALL to extinguish
it.)
4.
If the resulting display isn't exactly what you want, adjust the appropriate
VOLTS/DIV, SEC/DIV, POSITION, or Trigger controls.
Characteristics
of
AUTO Setup
With one channel, Auto Setup centers the a-volt level and makes the vertical
display
as
large
as
possible, within the graticule. With more than one channel,
the a-volt levels of
CH
1,
CH
2,
CH
3,
and
CH
4 are set at
+2,
0,
-2,
and
-3
divisions from center, respectively. When ADD
is
displayed, the
O-volt
level of
CH
2
is
set at - 2 divisions.
AUTO sets Sec/Div within the range from
20
ns
to
2 ms, to show two to
five
cycles of most signals. With narrow, low repetition-rate pulses, the sweep
runs faster
to
stretch out the display, with the appropriate trigger slope.
AUTO Setup
sets the trigger for Auto Lvi Mode, Vert Source,
DC
Coupling,
and
Min Holdoff, with level at the midpoint between signal peaks.
The
STEP/AUTO EXT SWITCH connector on the rear panel produces the
same functions
as
the STEP/AUTO button,
in
response to a switch closure or
TTL-low signal.
See
"Save and Recall Operation" for the sequence function of Step/Auto.
2465A/2455A/2445A
Operators
2-1
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