Ensemble Designs BrightEye 54 Sync Generator and Test Signal Generator - Manual (Page 13)

TM
BrightEye 54
BrightEye 54 - Page 13
ADJUSTMENTS
Frequency Adjustment
The BrightEye 54 contains a precision timing source that is calibrated at the
factory to meet full specifications for timing precision. However, because clock
crystals shift frequency as they age, it may be necessary to adjust the frequency of
the internal source. This adjustment should not be necessary until after several
years of use.
Frequency Adjustment Procedure
Connect the BrightEye 54’s composite output to a vector scope that is externally
referenced to a known accurate source generator. With external reference enabled
on the vectorscope, the vector display of the BrightEye 54 composite signal will
slowly rotate.
At this point, use the BrightEye Control Application to enable
Freq Adjust and
adjust the frequency to bring the BrightEye 54 into spec by making the rotation of
its vector slow or stop.
The specification of ±1Hz of subcarrier (in either PAL or NTSC) is met if the
vector takes more than 1 second to make 1 full revolution.
The original factory adjustment is equal to a
Freq Adjust value of 0.