Tektronix TBS1052C handleiding

Handleiding

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Peak Detect mode uses the

highest and lowest of all

the samples contained in

two consecutive acquisition

intervals. Use this mode

to help detect short rapid

transitions in a waveform.

Peak Detect is not available

at faster time per division

settings.

Hi Res mode oversamples

lower-frequency signals and

calculates the average of

all the samples for each

acquisition interval. Use Hi

Res mode to provide higher-

resolution (16-bit) sample

points for lower-frequency

waveforms.

Average mode calculates and

displays the average value

for each sample point over

a user-specified number of

acquisitions. Use A

verage

mode to reduce random noise.

Trigger concepts

The oscilloscope uses the data in the waveform record to construct and display a waveform on the oscilloscope screen. However

, as the

oscilloscope is constantly acquiring samples into the waveform record, each waveform record starts at a random point of the input signal.

This means that the waveform record sample values are constantly changing, which results in a displayed waveform that is unstable or

jittering. An unstable waveform cannot be accurately measured, making this display useless except for very broad measurements (type of

signal, approximate peak to peak signal amplitude).

Figure 1: Untriggered display

What is needed is a way to set the oscilloscope to detect, or trigger on, the same signal condition or state on the input signal for each

waveform acquisition, and store the samples in the waveform record such that the same signal condition is at the same sample time

location in the waveform record.

A trigger sets when the oscilloscope detects a defined waveform condition, such as at a specified signal voltage level on the rising edge

of the signal. The oscilloscope uses that trigger condition to store the waveform samples in the waveform record so that the signal sample

point that meets the trigger condition is at the same location in the waveform record. When displayed, the waveform record for each

acquisition shows the waveform at the same trigger point, resulting in a stable waveform on the screen.

Sampling oscilloscope concepts

TBS1000C Series Oscilloscopes User Manual 51

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