Setting System Parameters - Quantum Data 801GC, 801GF, 801GX Owner's And Programmer's Manual

6-4
Chapter 6: Programming

Setting system parameters

The following system parameters are stored in the
801G*'s non-volatile system memory:
• The size of the boxes used in the "BriteBox"
test image. The size of the box should match
the size of your light meter's probe. The fac-
tory default size is 50.4 mm (2.00 inches) square.
• The text string that appears in the upper por-
tions of the "SMPTE133" and "Cubes" test
images. The factory default string is "Quan-
tum Data."
• The analog video outputs' calibration factors.
These calibration factors allow you to extend
the usefulness of the 801G*'s self calibration
function. The individual analog video output
levels can be tweaked to compensate for fixed
losses or gains in your test set-up. The factory
default setting calibration factors is 1.000 for
all outputs.
• The analog sync calibration factor. The cali-
bration of the composite sync level of the green
component video output can also be tweaked.
The factory default setting is 1.000 for the cali-
bration factor.
• The reference rate calibration factor. The 801G*
uses a crystal controlled oscillator as the ref-
erence for all timing signals. The crystal fre-
quency has a maximum error of 50 ppm. The
801G* hardware and firmware is capable of
compensating for this small amount of error
by applying a user set calibration factor. The
factory default setting is 1.000 for the calibra-
tion factor.
• The maximum pixel clock rate used for error
checking formats. All 801G* generators will
operate, to some extent, at pixel rates beyond
their spec sheet limits. The maximum rate can
Model 801GC, 801GF & 801GX¥Rev. A