Tektronix TBS1052C handleiding

Handleiding

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A runt trigger needs two

thresholds to define the two

levels that a signal must pass

through to be considered a

valid (nonrunt) signal.

The arrow at the far right of

the screen marks the threshold

level(s) for that signal.

T

urning the Trigger Level knob

changes the threshold level

and momentarily displays a

long horizontal line (or two

lines for a runt trigger) across

the waveform to show the

trigger level(s) in relation to

the overall waveform.

Available trigger types

The oscilloscope lets you trigger on several signal conditions:

Trigger type Trigger conditions

Edge Edge triggers are the simplest and most commonly used trigger type. An edge

trigger event occurs when the trigger source passes through a specified voltage

threshold (trigger level) when the signal is transitioning in the specified slope

(rising or falling).

You can trigger on a rising or falling edge, as defined by the slope control.

Pulse

Width

You can trigger on pulses that are less than, greater than, equal to, or not equal

to a specified time period. Y

ou can trigger on positive or negative pulses.

Pulse width triggers are primarily used to analyze digital signals.

Runt

A runt pulse is a pulse that crosses one threshold but fails to cross a

second threshold before recrossing the first. Therefore, a runt trigger needs

two thresholds to define the two levels that a signal must pass through to be

considered a valid (nonrunt) signal.

You can trigger on any positive or negative (or either) runt signal. You can also

trigger on runt signals with pulse widths that are less than, greater than, equal

to, or not equal to a specified width.

Runt triggers are primarily used to analyze digital signals.

Trigger coupling

T

rigger coupling sets what part of the input signal is used by the trigger circuit. Trigger coupling choices are DC, LF Reject, HF Reject, and

Noise Reject.

Sampling oscilloscope concepts

TBS1000C Series Oscilloscopes User Manual 53

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