Tektronix MTM400 Manuel d'utilisateur télécharger pdf (Page 148)

Triggered Recording

MTM400 MPEG Transport Stream Monitor User Manual 3-103

The proportion of pre-trigger data may be less than specified if the trigger event

occurred before enough packets were recorded in the circular buffer (particularly

after clearing the buffer).

For example, if the available memory will hold a 20 second recording, with 25%

pre-trigger specified and an event-triggered recording starting five seconds or more

into the run, the contents of the recorded file will be:

Run

10 20 30

Trigger

time in seconds0

25% 75%

File

If the Trigger event was detected earlier than five seconds into the run, the

20 second file will contain all of the data up to the Trigger. If recording was

triggered at three seconds only the first 15% of the file would hold pre-trigger data.

The file contents would be:

Run

10 20 30

Trigger

time in seconds0

15% 85%

File

Triggered Recording Operation

The Operation section of the Triggered Recordings dialog is used to arm the

trigger before recording and shows the status of the recording activity.

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Tektronix MTM400 Manuel d'utilisateur Page 148