Tektronix TDS 500D series User Manual

Acquiring and Displaying Waveforms
TDS 500D, TDS 600B, & TDS 700D User Manual
3–31
A TDS 500D or TDS 700D Oscilloscope can interleave its channels to attain
higher digitizing rates without equivalent time sampling or interpolating. The
oscilloscope applies the digitizing resources of unused channels (that is, channels
that are turned off) to sample those that are in use (turned on). Table 3–2 lists
how interleaving more than one digitizer to sample a channel extends the
maximum digitizing rate.
Once you set horizontal scale to exceed the maximum digitizing rate for the
number of channels in use (see Table 3–2), the oscilloscope will not be able to
get enough samples to create a waveform record. At that point, the oscilloscope
will either interpolate to calculate additional samples or it will switch from real
to equivalent time sampling to obtain additional samples. (See Interpolation on
page 3–30 and Equivalent-Time Sampling on page 3–29.)
Table 3–2: How interleaving affects sample rate
N
Maximum digitizing rate
1
N
o. of
channels on
TDS 520D &
TDS 724D
TDS 540D TDS 754D
TDS 580D,
TDS 784D, &
TDS 794D
One 2 GS/sec 2 GS/sec 2 GS/sec 4 GS/sec
Two 1 GS/sec 2 GS/sec 2 GS/sec 2 GS/sec
Three or Four Not Available 1 GS/sec 1 GS/sec 1 GS/sec
1
When real-time sampling. (GS = Gigasamples; MS = Megasamples.)
All oscilloscopes in this manual support the following four acquisition modes:
Sample, Envelope, Average, and Peak Detect. TDS 500D and TDS 700D
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 500D and TDS 700D models
only, Hi Res, Envelope, and Average modes are not available when in DPO
mode; see Incompatible Modes on page 3–66.)
Interleaving
The Acquisition Modes

Tektronix TDS 500D series Specifications

General

Brand	Tektronix
Model	TDS 500D series
Category	Test Equipment
Language	English