Acquiring and Displaying Waveforms
TDS 500B, TDS 600B, & TDS 700A User Manual
3–25
TDS 500B and TDS 700A Models: Press Sample, Peak Detect, Hi Res,
Envelope, or Average (side). (InstaVu mode must be off to use Hi Res,
Envelope, or Average modes.)
3. If you selected Envelope or Average, enter the number of waveform records
to be enveloped or averaged using the keypad or the general purpose knob.
NOTE. TDS 500B and 700A models only: Selecting Hi Res mode in the Acquire
menu automatically reduces long record-length settings to prevent overflow of
acquisition memory. Because Hi Res mode uses twice the acquisition memory
used by other acquisition modes, allowing selection of the longer horizontal
record lengths with Hi Res mode would cause the oscilloscope to run out of
memory.
TDS 500B and TDS 700A models only: To limit the oscilloscope to real-time
sampling or let it choose between real-time or equivalent-time sampling:
Press SHIFT ACQUIRE MENU ➞ Repetitive Signal (main) ➞
ON or OFF (side).
ON (Enable ET) uses both the real-time and the equivalent-time sampling
as appropriate.
OFF (Real Time Only) limits the oscilloscope to real-time sampling. If the
oscilloscope cannot accurately get enough samples for a complete waveform,
it will interpolate.
The sampling speeds and the number of channels you choose affect the mode the
oscilloscope uses to sample waveforms. If the time base is set slow enough, the
oscilloscope always uses real-time sampling; if set fast enough, it always uses
equivalent-time sampling or interpolation. For speeds in between, the oscillo-
scope creates waveform records differently depending on the number of input
channels turned on. See the table appropriate to your oscilloscope model,
Table 3–4 or Table 3–5.
Selecting Repetitive
Sampling
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