User Manual - TRS-RenTelco

Option VGA Detailed Measurement Information
Max period
Min period
Jitter
Figure 3- 2: Jitter in H Sync period
Signal Source
The test signal used for the H Sync Jitter measurement can be any of the
available patterns in the Matrix signal, which is located on the Test Signal Files
CD-ROM.
Interpreting Results
A low numeric value of the H Sync jitter indicates a higher quality of incoming
signal.
How Results are
Calculated
The peak to peak H Sync Jitter is calculated as follows:
Max. SyncPeriod value − Min. SyncPeriod value
Jitter (peak − peak) =
2
Jitter (peak − peak)
Jitter(%) =
pixel clock period
The H Sync Jitter is calculated for N consecutive lines of video frames. N is
entered by the user.
Half of the difference between the minimum and maximum is reported as the H
Sync period jitter. This value is also quantified as a percentage of the pixel clock
period.
H Timing Measurement
The Horizontal Timing measurement consists of the following measurements:
the horizontal sync pulse, the back porch, the addressable video signal, the front
porch, the left border, and the right border.
3-46 VM5000 Automatic Video Measurement Set User Manual