Tektronix TBS1052C handleiding

Handleiding

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Sampling oscilloscope concepts

Sampling and acquisition concepts

Before the oscilloscope can display or measure a signal, it must be sampled. Sampling is the process of measuring the input signal

amplitude value at regular intervals (called the sampling rate, in samples per second), converting the sampled levels into digital data, and

storing the sampled values in memory to create a waveform record. The oscilloscope uses the digitized values in the waveform record to

create, display

, and measure waveforms. Each oscilloscope channel has its own waveform record memory storage.

TBS1000C Series oscilloscopes use real-time sampling. In real-time sampling, the oscilloscope samples and digitizes all of the sampled

points at one time, in sequence, stores the sampled data in memory

, and then repeats the sampling and storage process.

Use the Horizontal Scale knob to change the sample rate (samples per second). The oscilloscope automatically sets the sample rate so

that there are more than enough samples to accurately capture the signal information. The sample rate is shown on the screen at all times

in the horizontal position/scale readout.

Note:

•

The maximum sample rate of 1 GS/s is available on both channels, when both channels are active.

You can set the waveform record length (number of sample points in the waveform record) from 1000 points to 20k points. A longer

(larger) waveform record is useful to capture several waveform cycles to search for a waveform of interest, or to capture a great deal of

detail for just a few waveform cycles and then use the Zoom function to search the waveform for areas of interest.

Each time the oscilloscope fills the waveform record is called a waveform acquisition, or acquisition for short. Each acquisition stores

new sample data into the same waveform record for that channel.

A waveform record is further divided into acquisition intervals, which are equally sized groups of samples. Acquisition intervals let the

oscilloscope perform calculations to analyze and display data such as the minimum and maximum data values per interval, or the average

signal value per interval. How the values in the acquisition interval are used is set by the acquisition mode.

Acquisition mode concepts

The acquisition mode sets how the oscilloscope uses the sampled data points in each acquisition interval to create and display a

waveform. Y

ou can set the acquisition mode to one of the following modes.

Sample mode retains and uses

the first sampled point from

each acquisition interval to

create the displayed waveform.

This is the default mode.

Sampling oscilloscope concepts

TBS1000C Series Oscilloscopes User Manual 50

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