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Setting the Controls
After plugging in the oscilloscope, take a look at the front panel. As
described previously, the front panel is typically divided into three main
sections labeled vertical, horizontal, and trigger. Your oscilloscope may
have other sections, depending on the model and type – analog or digital.
Notice the input connectors on your oscilloscope – this is where you
attach the probes. Most oscilloscopes have at least two input channels and
each channel can display a waveform on the screen. Multiple channels are
useful for comparing waveforms.
Some oscilloscopes have AUTOSET and/or DEFAULT buttons that can set
up the controls in one step to accommodate a signal. If your oscilloscope
does not have this capability, it is helpful to set the controls to standard
positions before taking measurements.
General instructions to set up the oscilloscope in standard positions
are as follows:
Set the oscilloscope to display channel 1
Set the vertical volts/division scale and position controls to mid–range positions
Turn off the variable volts/division
Turn off all magnification settings
Set the channel 1 input coupling to DC
Set the trigger mode to auto
Set the trigger source to channel 1
Turn trigger holdoff to minimum or off
Set the intensity control to a nominal viewing level, if available
Adjust the focus control for a sharp display, if available
Set the horizontal time/division and position controls to mid-range positions
Refer to the manual that accompanied your oscilloscope for more detailed
instructions.
The Systems and Controls of the Oscilloscope
section of
this primer describes oscilloscope controls in more detail.
Using Probes
Now you are ready to connect a probe to your oscilloscope. A probe, if
well-matched to the oscilloscope, will enable you to access all of the
power and performance in the oscilloscope and will ensure the integrity
of the signal you are measuring.
Please refer to The
Complete Measurement System
under the
Systems
and Controls of the Oscilloscope
section, or the Tektronix’
ABCs of
Probes
, for additional information.
Connecting the Ground Clip
Measuring a signal requires two connections: the probe tip connection
and the ground connection. Probes come with an alligator–clip
attachment for grounding the probe to the circuit under test. In practice,
you attach the grounding clip to a known ground in the circuit, such as
the metal chassis of a stereo you are repairing, and touch the probe tip
to a test point in the circuit.
XYZs of Oscilloscopes
Primer
Summary of Contents for XYZs
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