Typical pal composite video test signals used by vm700T




Дата канвертавання25.04.2016
Памер11.88 Kb.
Typical PAL composite video test signals used by VM700T.
A number of common test signals are used for conventional testing of PAL video distribution circuits and equipment. If you are using the VM700T as your measurement instrument, a brief overview of the signal types and the VM700T MEASURE application that uses these is shown below.

Test                                    Signal Used                  VM700T Measurement mode  

.

Video Output Level             CCIR17                        Bar Line Time



Color Burst Level               Any valid color signal  H Timing

Sync Level                        Any valid color signal     Bar Line Time, H Timing, others.

Field Time Distortion        Field Square Wave   Two Field

Long Time Jitter             Any valid color signal    Jitter Long Time

SNR Unweighted               0% pedestal      AUTO, Noise Spectrum

Luminance NonLinearity    CCIR17   Luminance NonLinearity

DG                                      CCIR330       DGDP

DP                                   CCIR330    DGDP

Chroma Amplitude Error     CCIR331      Chrominance NonLinearity      

Chroma Phase Error          CCIR331   Chrominance NonLinearity

Chroma/Luma Intermod   CCIR331    Chrominance NonLinearity

Multiburst                           CCIR18     Multiburst

H-Sync Jitter               Any valid color signal    Jitter

75% Color Bar Vector  75% Color Bar     ColorBars, Vector, others

Group Delay            Sin X/X   Group Delay Sin x/x

CL Gain                         CCIR17         ChromLumGainDelay

CL Delay                         CCIR18      ChromLumGainDelay

Line Time Dist.                 CCIR17   Bar Line Time

Short Time Distortion        Special 1T CCIR17    Short Time Distortion   

2T K Factor                CCIR17    K Factor

Burst Frequency            Any valid color signal   Burst Frequency     

SCH Phase                Any valid color signal     SCH Phase, Auto

Bar Tilt                CCIR17       Bar Line Time.

Color Bar measurements 75% Color Bar   ColorBar, Auto, Vector



To assist in quick “sight recognition” of these test signal types, a selection of screen captures from a Tektronix WFM7120 are included in the following images sets.

CCIR 17

CCIR 18


CCIR 330

CCIR 331


75% Color Bars (PAL)

SIN X/X


Field Square Wave


База данных защищена авторским правом ©shkola.of.by 2016
звярнуцца да адміністрацыі

    Галоўная старонка