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Acquiring Waveforms

3-40

CSA7000B Series & TDS7000B Series Instruments User Manual

NOTE. When using either type of interpolation, you may want to set the display

style so that the real samples are displayed intensified and interpolated samples

are dimmed. The instructions under Select the Display Style on page 3--135

explain how to turn on intensified samples.

The instrument can interleave its channels to attain higher digitizing rates

without equivalent-time sampling. The instrument 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--3 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--3), the instrument will not be able to get

enough samples to create a waveform record. At that point, the instrument will

switch from real to equivalent time sampling to obtain additional samples. (See

Equivalent-Time Sampling on page 3--37.)

T able 3- 3: How interleavi ng affects sample rate

Number of channels

Maximum digitizing rate when real-time sampling

in use

CSA7404B

TDS7704B TDS7404B TDS7254B TDS7154B

One 20 GS/sec 20 GS/sec 20 GS/sec 20 GS/sec 20 GS/sec

Two 10 GS/sec 10 GS/sec 10 GS/sec 10 GS/sec 10 GS/sec

Three or Four 5 GS/sec 5 GS/sec 5 GS/sec 5 GS/sec 5 GS/sec

Using Fast Acquisition Mode

This section describes how to use Fast Acquisition mode and how it differs from

normal acquisition mode.

Fast acquisition mode reduces the dead time between waveform acquisitions that

normally occur when digitizing storage instruments (DSOs) acquire waveforms.

This dead-time reduction enables Fast Acquisition mode to capture and display

transient events, such as glitches or runt pulses, often missed during longer dead

times that accompany normal DSO operation. Fast Acquisition mode can also

display waveform phenomena at an intensity that reflects their rate-of-occur-

rence.

Fast acquisition XY and XYZ modes also provide intensity information by

accepting continuous, non-triggered data from the input channels.

Interleaving

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