Tektronix TDS 700A User Manual

Acquiring and Displaying Waveforms
TDS 500B, TDS 600B, & TDS 700A User Manual
3–21
Table 3–2: How Interleaving Affects Sample Rate
No. of Channels
Turned On
Maximum Digitizing Rate
1
No. of Channels
Turned On
TDS 520B or TDS 724A TDS 540B or TDS 744A TDS 784A
One 1 GS/second 2 GS/second
2
4 GS/second
Two 500 MS/second 1 GS/second 2 GS/second
Three or Four Not Available 500 MS/second 1 GS/second
1
When real-time sampling. (GS = Gigasamples; MS = Megasamples.)
2
This TDS model, when purchased with Option 1G, is limited to a maximum sample
rate of 1GS/second. See Option 1G on page A–1.
All oscilloscopes in this manual support the following four acquisition modes:
Sample, Envelope, Average, and Peak Detect. TDS 500 B and TDS 700A
Oscilloscopes also support Hi Res. Keep in mind which modes apply to your
model oscilloscope as you read the following descriptions.
Sample (the mode most commonly used), Peak Detect, and Hi Res modes
operate in real time on a single trigger event, provided that the oscilloscope can
acquire enough samples for each trigger event. Envelope and Average modes
operate on multiple acquisitions; the oscilloscope averages or envelopes several
waveforms on a point-by-point basis. (For TDS 500B and TDS 700A models
only, Hi Res, Envelope, and Average modes are not available when in InstaVu
mode; see Incompatible Modes on page 3–47.)
Figure 3–13 illustrates the different modes and lists the benefits of each. It will
help you select the appropriate mode for your application. Refer to it as your
read the following descriptions of each mode.
Sample Mode. In Sample mode, the oscilloscope creates a record point by saving
the first sample (of perhaps many) during each acquisition interval. (An
acquisition interval is the time covered by the waveform record divided by the
record length.) Sample mode is the default mode.
Envelope Mode. Envelope mode lets you acquire and display a waveform record
that shows the extremes in variation over several acquisitions. You specify the
number of acquisitions over which to accumulate the data. The oscilloscope
saves the highest and lowest values in two adjacent intervals similar to the Peak
Detect mode. But Envelope mode, unlike Peak Detect, gathers peaks over many
trigger events.
After each trigger event, the oscilloscope acquires data and then compares the
min/max values from the current acquisition with those stored from previous
acquisitions. The final display shows the most extreme values for all the
acquisitions for each point in the waveform record.
The Acquisition Modes

Tektronix TDS 700A Specifications

General

Brand	Tektronix
Model	TDS 700A
Category	Test Equipment
Language	English