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Acquiring and Displaying Waveforms
3–8
TDS 500C, TDS 600B, & TDS 700C User Manual
H The oscilloscope switches to 50 W and disables AC coupling (and switches
coupling to DC if AC is selected) if you connect an active probe, such as the
P6245 probe. Such probes also reduce the maximum volts/div to 10 V as just
described. This behavior results in 50 W, nonAC coupling, which is
appropriate for such probes (probes with a level 2 interface do not display W
in the readout).
NOTE. If you remove an active probe, the oscilloscope does not switch coupling
back to 1 MW (nor AC if it was previously selected). Nor does the oscilloscope,
when you restore 1 MW coupling, return to a volts/division setting that was
reduced due to the 50 W selection. In general, you must set channel scale, input
coupling, and impedance appropriate for your input coupling scheme. Be sure to
switch to 1 MW for any input signal not from a 50 W system.
To find a procedure for changing the coupling and input impedance settings, see
To Change Vertical Parameters on page 3–17.
To find a list of available probes, see Accessory Probes on page 0–5.
To find a guide for selecting probes for a variety of applications, see Appen-
dix D: Probe Selection on page D–1.
Setting up Automatically: Autoset and Reset
The TDS Oscilloscope can automatically obtain and display a stable waveform
of usable size. It can also be reset to its factory default settings. This subsection
describes how to execute Autoset and reset, and lists the default settings in effect
after an Autoset.
Autoset automatically sets up the front panel controls based on the characteristics
of the input signal. It is much faster and easier than a manual control-by-control
setup. Autoset adjusts controls in these categories: Acquisition, Display,
Horizontal, Trigger, and Vertical.
To Find More Information