BridgeTech VB20 User Manual page 82

Note that due to the way the probe aggregates interrupts for high bitrates the sub-
millisecond accurracy of the IAT measurements may be affected when the probe
experiences a combined bitrate of 200 Mbit/s or above. Below this limit there is no
interrupt aggregation so the IAT measurements will be accurate. The inaccuracy has
been measured to be plus minus 0.2 ms at 750 Mbit/s.
Note that for variable bitrate streams the IAT histogram will show a very different IAT
distribution compared to the histogram for a constant bitrate stream. The histogram in
the screenshot above displays the IAT distribution for a CBR stream.
Thumb View
The Thumb View pop-up is accessed by clicking an information icon in the Detailed
Monitoring - Services view. This view displays a large thumbnail of the selected
stream with an increased update rate compared to non-selected streams. Service
audio level is indicated by one audio level bar per audio component.
Clicking the Close button will close the Thumb View.
Audio fields
PID: The audio PID for which the associated parameters apply
Language: The audio language, as derived from PSI/SI
Average: The average audio level in dB, measured over a period of
PROBE USERS' MANUAL VERSION 5.0
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