Basic Measurements
1760 SeriesComponent Waveform/Vector Monitor User Manu al 4-17
For better viewing of Lightning displays, the GAIN menu and
X5 can be selected. PressCLEAR MENU to clear the GAIN
menu readout. Since the gratic ule ise lectronically gener-
ated, the calibration is notaltered by X5 gain. Use the Verti-
cal Positioncontrol to view the entire display. When X5 gain
is no longer desired, select the GAIN menu again,and set gain
to X1. To exit, pushGAIN menu again, or push CL EARMENU.
Amplitude Measurements
With color-difference formats, luminance increasesfrom the
bright dot in the center of the graticule; it plots upward in the
upper half of the screen, and downward in the lower half.
The color-difference or chroma amplitude is the horizontal
deflection away from the luminance axis. A purely mono-
chrome signalis indicated by a vertical line along the lumi-
nance axis. Check that the signal appea rswithi nt he targets
of the electronicgraticule. If it is tooclose to the center dot,
it is too small; too far away,it is too large.
Encoder Accuracy
The Lightning display allows the operator to che ck encoder
accuracy by viewingthe relative amplitudes of luminance
and color difference signals in one display.
Timing
Lightning can alsobe used for evaluating interchannel tim-
ing. One input signal used for this display is a col or bar that
is compatible withthe Lightning graticule. Note the row of
graticule dots between the Green and Magenta boxe si n both
the upper and lower halves of the Lightning display. If the
signal trace passes through the cente r dot of this row in each
half of the display,the interchannel timing is correct.
The modulated sin2pulse can also be used to check for tim-
ing errors using the Lightning display. When inter-channel
timing is correct,a straight line is seen. An ellipse indicates
a timing error. Due to lower bandwidth amplifiers this signal
has less noise obstructing the display than the Bowtie method