| Test Signals | ||||
|---|---|---|---|---|
| Name | Description | Usage | Examples | |
| 100% COLOUR BARS | This signal contains the traditional seven colours . From left to right they are white, yellow, cyan, green, magenta, red and blue | The colour bar signal is used to align colour monitors and, in systems, to check colour phase and amplitudes using vector monitors. | SDI Waveform | |
| 75% COLOUR BARS | This signal contains the traditional seven colours . From left to right they are white, yellow, cyan, green, magenta, red and blue | The colour bar signal is used to align colour monitors and, in systems, to check colour phase and amplitudes using vector monitors. | SDI Waveform | |
| 100% COLOUR BARS over RED | This signal contains the traditional seven colours . From left to right they are white, yellow, cyan, green, magenta, red and blue | The colour bar signal is used to align colour monitors and, in systems, to check colour phase and amplitudes using vector monitors. | SDI Waveform | |
| SMPTE COLOUR BARS | The top or first band contains the traditional seven colours . From left to right they are white, yellow, cyan, green, magenta, red and blue. The middle band contains reversed bars with every other bar set to black. The third band contains the I, white, -Q, and black | The colour bar signal is used to align colour monitors and, in systems, to check colour phase and amplitudes using vector monitors. This split-field arrangement allows adjustment of colour saturation or colour intensity and hue or tint on a colour monitor . The monitor is set to blue only and the hue or phase is adjusted on the monitor until there is no discernable intensity difference between the reversed blue bars and their adjacent colour bars. The IYQB section of the bottom pattern are helpful to assure the subcarrier processing in correct. | SDI Waveform | |
| BOWTIE | Y channel is 500KHz. Cr,Cb channels are 502KHz phase adjusted so equal to Y in mid line.Y Waveform is 438 bits (350mV) p/p centred on 502 bits (350mV).C Waveform is 448 bits (350mV) p/p centred on 512 bits (350mV).Timing markers at +/-5nSec and at every 20nSec. |
Component analog video (CAV) test signal used for high-precision measurement of component channel gain and delay inequalities.
|
SDI Waveform | |
| SWEEP | Sweeps from 500KHz to 6.75MHz over the line period, with markers at 1,2,3,4,5 MHz.Waveform is 600bits (480mV) p/p centred on 502 bits (350mV). |
Sweep is another frequency response measurement signal. Rather than discrete packets as in multiburst this signal has a continuous sweep of frequencies . There are frequency markers on lines toward the bottom of the screen. These are helpful to determine where your rolloff occurs | SDI Waveform | |
| PLUGE | Grey scale block for colour monitor gain tracking adjustment and grey/superblack stripes for brightness setting. Block is 940 bits (700mV), 502 bits (350mV), 239 bits (140mV).Stripes are at 64 +/- 18bits (+/- 14mV). |
PLUGE stands for (Picture Line-Up Generating Equipment). This pattern, is used to set the brightness of the monitor. The monitor is adjusted so that the black and blacker than black areas are indistinguishable from each other and the lighter than black area is slightly lighter (the contrast should be at the normal setting). | SDI Waveform | |
| MULTIBURST | White bar at 765 bits (560mV) followed by six frequency bursts at 500KHz, 1MHz, 3MHz,4MHz, 4.8MHz, 6.75MHz at 526 bits (370mV) p/p centred on 502 bits (350mV). |
This test signal is used to evaluate amplitude verses frequency performance in television systems. Those specific frequencies match most standards. Tests usually entail observing each multiburst packet amplitude, passing the test signal through a device , and again measuring the amplitude of each packet. Any variance in amplitude in any packet shows a gain variance in the unit under test at that specific frequency | SDI Waveform | |
| PULSE+BAR | 2T luma pulse at 940 bits (700mV), 10T chroma pulse at 502 bits (350mV), 20 uSec bar at 940 bits (700mV). |
Waveform amplitude and gain measurements, also Kbar K pulse/bar and Kpulse rating | SDI Waveform | |
| MOD STEPS | 5-step ascending staircase, equal steps of 175 bits (140mV) each. Added chroma of Cr at 638 bits and Cb at 652 bits. |
The Modulated Staircase test pattern is useful for differential phase and differential gain measurements | SDI Waveform | |
| WHITE | Plain full white screen.Y waveform 940 bits (700mV), Cr at 512 bits, Cb at 512 bits. |
SDI Waveform | ||
| RED | Plain full red screen.Y waveform is 326 bits (209mV), Cr at 960 bits, Cb at 361 bits. |
Used almost exclusively in colour picture monitor set-up and testing | SDI Waveform | |
| CONVERGE | Crosshatch pattern for colour monitor convergence adjustment.23 Horizontal lines and 23 Vertical lines. |
used in evaluating and adjusting monitor convergence and determining geometric variations in linearity, pin cushion and trapezoid distortions and may be used to assist in evaluating camera geometry characteristics | SDI Waveform | |
| SDI CHECK | Top half of the screen is the equaliser test and contains several examples of 19 "0"s followed by 2 "1"s per frame. Bottom half of the screen is the phase locked loop test and contains several examples of 20 "0"s followed by one "1" per frame. |
Equalizer SDI Test Signal PLL SDI Test Signal for testing SD SDI signals and paths |
SDI Waveform | |
| RAMP | Y waveform is an ascending ramp, running from 64 bits (0mV) to 940 bits (700mV). Cr and Cb waveforms are ascending ramps, running from 64 (-350mV) to 960 (+350mV) |
This test signal is can also be used to measure differential gain and is good for measuring analog to digital bit errors in digital video systems. | SDI Waveform | |
| LIM RAMP | Y waveform is an ascending ramp, running from 1 bit (50 mV below black) to 1022 bits (66mV above peak white). |
SDI Waveform |
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© Hamlet Video International 28/09/2006 |
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