Tektronix CSA7404B, User Manual

Page: 78 / 438

Acquiring Waveforms
3- 10
CSA7000B Series & TDS7000B Series Instruments User Manual
Coupling. All instruments and probes specify a maximum signal level. (See
Specifications in your user manuals for exact limits.)
CAUTION.
Exceeding the maximum limit, even momentarily, may damage the
input channel. Use external attenuators, if necessary, to prevent exceeding the
limits.
Coupling determines whether an input signal is directly connected to the input
channel or not connected at all. These choices are referred to as DC coupling,
and GND coupling.
The input resistance of each input channel is 50
Ω
. To properly terminate signals
in other impedance environments, use an adapter.
All probes expect a specific coupling and input termination. Both coupling and
input termination resistance are displayed on screen.
Scaling and Positioning. These key controls determine the portion of the input
signal presented to the acquisition system:
H
Set vertical scaling, positioning, and DC offsets to display the features of
interest on your waveform and avoid clipping. (See
Note that follows.)
Vertical Acquisition Window Considerations on page 3--18 describes the
vertical acquisition window.
Clipped
Acquired waveform Displayed waveform