Acquiring and Displaying Waveforms
3–18
TDS 500D, TDS 600B, & TDS 700D User Manual
To select the coupling, bandwidth, and offset for the selected waveform, use the
Vertical menu (Figure 3–6). This menu also lets you numerically change the
position or scale instead of using the vertical knobs. To make such changes, do
the following procedures:
NOTE. The TDS 794D Oscilloscope requires a P6339 probe for AC coupling,
10 M input impedance, and bandwidth selections to appear in the menus.
Coupling. To choose the type of coupling for attaching the input signal to the
vertical attenuator for the selected channel and to set its input impedance:
Press VERTICAL MENU ➞ Coupling (main) ➞ DC, AC, GND, or W (side).
DC coupling shows both the AC and DC components of an input signal.
AC coupling shows only the alternating components of an input signal.
Ground (GND) coupling disconnects the input signal from the acquisition.
Input impedance lets you select either 1 M W or 50 W impedance.
NOTE. If you select 50 impedance with AC coupling, the digitizing oscillo-
scope will not accurately display frequencies under 200 kHz.
Also, when you connect an active probe to the oscilloscope (such as the P6245),
the input impedance of the oscilloscope automatically becomes 50 . If you then
connect a passive probe (like the P6139A), you need to set the input impedance
back to 1 M.
The maximum volts/div setting is reduced from 10 V to 1 V when you select 50
impedance. See the discussion Input Impedance Considerations on page 3–8.
To Change
Vertical Parameters
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