FUNCTION REFERENCE

5 - 33

ENVELOPE

Description:

If a waveform is changing over time (because of drift, jitter, or intermittent faults), the ‘history’ of the changing waveform can be collected using the envelope mode. In the envelope mode the minimum and maximum signal values are stored, taking the values of a large number of successive waveform acquisitions. If an interpolation mode is switched on, the area between the maximum and minimum values is shaded.

Each time the settings of the scope are changed (like trace POS), the envelope process is restarted by clearing the acquisition register. A new envelope process starts and continues until stopped or until a change of settings is made.

ST6788

ST6789

Display of signal with

Display of signal with frequency

amplitude variation (AM).

variation (FM or jitter).

ENVELOPE and AVERAGE functions are mutually exclusive. When the AVERAGE function is selected, the ENVELOPE mode is automatically switched off.

Key sequence:

 

ENVELOPE

 

ACQUIRE

on off

Toggle softkey to switch Envelope on or off.

 

 

 

ST6790

 

 

9303

 

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Image 153
Fluke PM3370B user manual Display of signal with, Amplitude variation AM Variation FM or jitter