Magni AVM-510A Series, Operator'S Manual

Page: 111 / 182

Automatic Measurement (AVM-510A)
9-5
When using AUTOMEASURE/AUTO MEAS SET mode, the AVM-510A recognizes these signals:
Test Signals
525 Systems 625 Systems
75% color bars, with setup
100% color bars, with setup
SMPTE color bars* 75% colour bars
100% colour bars
FCC multiburst CCIR 18
FCC composite
NTC7 composite CCIR 17* & CCIR 330*
National ITS
Note that when selecting a line number for SMPTE Color Bars, CCIR 17, and 330:
•
75% SMPTE Bars is never a vertical interval signal. It is made up of three separate signals in one
frame. If the signal you are measuring is SMPTE Color Bars, you can select any line in the active
video area. The AVM-510A will then recognize it as SMPTE Color Bars and then look for a setup
in the lower part of the field.
•
CCIR 17 and CCIR 330 are found on the same line number in opposite fields. The AVM-510A
uses CCIR 17 for some of the measurements and CCIR 330 for others. However, if the signal is a
full field CCIR 17 or CCIR 330, and you selected a line in the active video area, the other signal
will not be in the other field. In this case, some of the sampling produces error measurements,
even though the signal is correct.
The limits that are applied when using AUTOMEASURE/AUTO MEAS SET are the same limits that
are established in one of the specific measurement sets. For example, set the Sync Ampl limits in the
Color Setup measurement set to 38 and 42 IRE, select AUTOMEASURE/AUTO MEAS SET from the
SELECT SET menu, and then select line 17. If the signal on line 17 is a color bar, Color Setup is
applied, and the limits from the Color Setup measurement set is used.
NOTE: The measurement set that is applied to the signal is the last measurement set
selected from the SELECT SET menu. The line number used is also from the applied
measurement set.
Forcing a Measurement Set Selection
In some cases you might want to force the AVM-510A to apply a specific measurement set to a test
signal. For example, a noisy signal or you want to apply some tests that are available in one
measurement set to a different signal.
You can force automeasurement at two levels:
•
Force automeasurement to apply a specific measurement set to the signal, but still allow the AVM-
510A to determine what test signal is present on the selected line.
•
Force the AVM-510A to apply a specific measurement set and force it to recognize the signal. For
example, CCIR 18, whether or not the signal is CCIR 18.