Magni AVM-510A Series, Руководство оператора

Страница: 118 / 182

Automatic Measurement (AVM-510A)
9-12
10. Select each of the packets and then turn the knob to set the frequency, in 0.1 MHz increments, to
the frequency of that packet in the multiburst. Note that the frequencies shown in the
automeasurement display does not change to reflect your entry here. However, the measurement
system must have the correct frequency to operate properly.
11. Press the Clr Mnu button to exit.
Now when the AVM-510A selects MULTIBURST TIMINGS instead of FCC multiburst or CCIR 18, it
uses these timing measurements to analyze the signal. These values remain as they are until you
change them, or until you do a full system reset.
NOTE:
The multiburst timing and packet frequency can be set differently for input A:,
Input B:, and for 525 and 625 line systems. As a result, there are four sets of multiburst
timing and packet frequency that the AVM-510A can store; however, these values are not
stored in the 10 front panel memories.
Automeasurement with Live (Program) Video
The System Video measurement set is designed for measuring program (live video) signals. The Color
Setup and Fequency Response measurement sets can also be used on live video, but they have limited
results.
The System Video measurement set is the one most used on live or program video.You must
specifically select this measurement set, it cannot be selected automatically using
AUTOMEASURE/AUTO MEAS SET. Measurement of program video is different from measurement
of test signals. Some of the measurements are made on all active lines instead of on a specifically
selected line. These include:
•
Peak Video

The highest point reached by any video, including chrominance, on any active
line.
•
Peak Luma

The highest point reached by the liminance video on any active line. Luminance
video is the video that would result from passing in through the luma filter.
•
APL

Average Picture Level. The average of the active picture area, including chroma. This
measurement is taken in blocks of 10 lines, sequenced through the picture, so it will vary as the
measurements are taken in differenct parts of the picture.
•
H Blanking

Horizontal blanking is measured at the H Blanking Level. It is the distance (time)
between the last video at that level on any active line to the first video at that level on any active
line. The H Blanking Level is set in the SYSTEM VIDEO LIMITS menu.