Tektronix MDO4054-3, User Manual, Page: 124 / 222

Display Waveform or Trace Data
If you do not have a deskew fi xture, you
can use the controls in the Deskew menu to
set the oscilloscope’s deskew parameters
to recommended values, based on the
nominal propagation delay of each probe.
The oscilloscope automatically loads the
nominal propagation delay values of TekVPI
and TekProbe II (requires use of a TPA-BNC
adaptor) probes. For other common probes,
fi rst push the side-bezel Select button, and
select the channel to which the probe is
attached. Then push the side-bezel
Probe
Model button, and select the probe model.
If your probe is not in the list, set probe
model to
Other
, and push the side-bezel
Propagation Delay button and dial in its
propagation delay with multipurpose knob a .
To display the recommended deskew values
calculated by the oscilloscope, set the
side-bezel
Show rec. deskews to Yes .
To set the deskew values of each
channel to the recommended values,
push the side-bezel
Set all deskews to
recommended values button.
Quick Tips
Using Probes with the TekProbe II and TekVPI Interfaces. When you attach a probe with the TekProbe II or the
TekVPI interface, the oscilloscope sets the channel sensitivity, coupling, and termination resistance automatically to
match the probe requirements. Tek Probe II probes require use of the TPA-BNC Adapter.
The Difference Between Vertical Position and Offset. Adjust the vertical position to place the waveforms where you
want to see them. The waveform baseline indicators indicate the zero Volts (or Amps) level for each waveform. If you
adjust the channel’s Vertical Scale, the waveform expands or contracts around the waveform’s baseline indicator.
When you use the Channel<x> > More > Offset > Vertical Offset control to move a waveform, the baseline indicator
no longer represents zero. Instead, it represents the level of the offset. If you adjust the channel’s Vertical Scale, the
waveform expands or contracts around the waveform’s baseline indicator.
50 Ω Protection. If you select 50 Ω termination, the maximum vertical scale factor is limited to 1 V/div, except that with a
10X probe the scale factor is 10 V. If you apply excessive input voltage, the oscilloscope automatically switches to 1
M
Ω termination to protect the internal 50 Ω termination. For more details, refer to the speci fi cations in the MDO4000
Series Oscilloscopes Technical Reference .
MDO4000 Series Oscilloscopes User Manual 105