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015-0075-00: Difference between revisions
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Video Staircase Differentiator | The Tektronix "015-0075-00 Video Staircase Differentiator" is intended | ||
for measuring luminance nonlinearity in analog video systems. | |||
The typical setup for this measurement is as follows: | |||
A video signal generator produces a pattern with a few vertical bars | |||
with uniformly increasing luminance. | |||
The signal is applied to the device or system under test. | |||
The output is differentiated by the 015-0075-00 and viewed on an oscilloscope, | |||
triggering on the row sync signal. | |||
If the system under test has linear luminance response, | |||
the luminance waveform at its output will be a uniform staircase, | |||
and differentiating it will produce a series of pulses of equal amplitude. | |||
Deviations from linearity, e.g., dynamic compression, will be seen | |||
as pulses of decreasing amplitude. | |||
<gallery> | <gallery> | ||