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Applications

Taking Measurements Across Multiple Lines

When the VM Series system takes a measurement, where the measurement is taken (you c ould also say when the

measurement is taken) is speciﬁed by the line number. (If you want to measure the Luma Level, you need to make sure the

measurement is taken within the active video portion of the signal.) Sometimes you will need to take a measurement across

more than one line. (For example, you might need to verify that the Levels are consistent from the top to the bottom of the

display.) To do this, use the Multi Lines setting under Line Select on the Operation tab. Each measurement requires an

appropriate signal pattern to be present on a speciﬁed line of the input video signal. This line number setup parameter is

conﬁgured via the "Line Number" input box in the measurement’s results panel. The signal pattern is generally available on

multiples lines of the input signal. The measurement can be performed by specifying any of those individual lines.

NOTE. Some measurements are not available in Multiple Lines mode. The Setup Only, Run Only and Continuously settings

(Operation panel) are not selectable in Multiple Lines mode.

When the i nstrument is in Multiple lines mode, measurements are performed sequent ially on each of the line numbers in the

range speciﬁed for the selected measurement(s). The results for the individual lines are averaged and then displayed in the

measurement’s results panel. The speciﬁed line numbers for the selected measurement is displayed in the Line Number ﬁ eld

in the corresponding results panel. When the Run Mode is set to Once & Report, the instrument generates a report ﬁle in the

selected format (RTF, PDF or CSV), that contains the results for all of the i ndividual line numbers in the selected range,

followed by the averaged results calculated for the whole range.

1. Power on the instrument.

2. Select Analyze > VM HD and SD Video

V3.2 or VM VGA Video V3.2.

70 VM Series Video Measurement System Quick Start User Manual

Tektronix TDS5054B User Manual

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