Acquiring and Displaying Waveforms
TDS 500D, TDS 600B, & TDS 700D User Manual
3–37
The oscilloscope extends the limit at which it must switch from real-time
sampling by using the digitizers of channels that are turned off to sample the
channel or channels that are turned on.
Check Table 3–4 below to determine the time base setting(s) at which the switch
from real-time sampling (RT) to equivalent time sampling or interpolation (ETI)
occurs for your model.
Table 3–4: TDS 500D and TDS 700D Sampling mode selection (when fit to screen is off)
Model
TDS 520D &
TDS 724D
TDS 754D & TDS 540D
TDS 580D, TDS 784D, & TDS794D
Channels on
1
1 2 1 or 2 3 or 4 1 2 3 or 4
Time base
2
u50 ns RT
3
RT RT RT RT RT RT
50 ns RT RT RT RT RT RT RT
25 ns RT ETI
4
RT ETI RT RT ETI
12.5 ns ETI ETI ETI ETI RT ETI ETI
t12.5 ns ETI ETI ETI ETI ETI ETI ETI
1
Note that the TDS 520D and TDS 724D can have no more that two channels on at a time.
2
“u” means “slower than”; “t” means “faster than.”
3
“RT” abbreviates “Real-Time Sampling” throughout this table.
4
“ETI” abbreviates “Equivalent-Time Sampling or Interpolation” throughout this table.
To choose the event that stops the acquiring waveforms, do the following step:
Press SHIFT ACQUIRE MENU ➞ Stop After (main) ➞ RUN/STOP button
only, Single Acquisition Sequence, or Limit Test Condition Met (side). (See
Figure 3–17.) (TDS 500D and TDS 700D models only: single acquisition and
limit testing are ignored in DPO mode; see Incompatible Modes on page 3–66.)
Stop After
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