Quantum Data 801GC, 801GF, 801GX manual Setting system parameters

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

6-4 Chapter 6: Programming Model 801GC, 801GF & 801GX¥Rev. A