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Video Test Generator User Guide 253
CALF
analog video CALibration Factors
Class System calibration settings
Description Sets the analog output calibration factors to values other than those set by the generator's
own self-calibration function. Each channel is calibrated using two independent zero
calibration points, and two independent slope calibration points. Interpolation equations for
the different video types are used to set the caldac values that controls the output sync
and voltage levels to the correct values.
TV calibration uses two factors for NTSC output, and two factors for PAL output.
Note: Sending bad calibration factors to the generator via the CALF command can hang
the generator. If the generator hangs it will have to be reinitialized.
Command syntax CALF zero500R, zero50R, slope1500R, slope1000R, zero500G, zero50G, slope1500G,
slope1000R, zero500B, zero50B, slope1500B, slope1000B, ntsc714, pal700, ntsc_blank,
pal_blank
zero500R
Red calibration factor from 0 (most negative) to 4095 (least negative) at -1.0V.
zero50R
Red calibration factor from 0 (most negative) to 4095 (least negative) at -100mV.
slope1500R
Red calibration factor from 0 (maximum swing) to 4095 (minimum swing) at 2.0V.
slope1000R
Red calibration factor from 0 (maximum swing) to 4095 (minimum swing) at 1.4V.
zero500G, zero50G, slope1500G, slope1000R
Green calibration factors.
zero500B, zero50B, slope1500B, slope1000B
Blue calibration factors.
ntsc714
Factor from 0 (maximum swing) to 4095 (minimum swing) for NTSC output level at
714mV. The ntsc714 and ntsc_blank values are interrelated.
pal700
Factor from 0 (maximum swing) to 4095 (minimum swing) for PAL output level at
700mV.
ntsc_blank
Factor from 0 (least negative) to 4095 (most negative) used to set the zero level of the
NTSC output at 0.0 IRE.