800 SERIES
LINK ELECTRONICS, INC.
SYSTEM TIMING AND SC PHASE INSTRUMENT
MODEL IEC-835
MADE IN THE USA
PhaseIcon Instrument
MODEL IEC-835
FEATURES
‹ SC/H Phase
‹ H. Timing
‹ Burst Amplitude
‹ Easy to Operate
Although the primary function of the Phaselcon is
SC/H
Timing & SC Phase
The IEC-835 Phaselcon measures the subcarrier to
horizontal condition of any composite NTSC video
signal and displays the results on any standard
monitor. This measurement system also greatly
decreases the time involved in extremely precise
system timing. The information shown on the video
monitor is horizontal timing and subcarrier phase.
The visual display of the Phaselcon is keyed over the
selected input. The Phaselcon displays the graphics
for SC/H in the lower ½ of the video display.
SC/H certification, it does system timing and burst
amplitude as well. Timing of two video sources is
accomplished by adjusting the source timing until the
two vertical lines on the left side of the display are
superimposed. Asthesourcetimingapproaches200
nS, the vertical line is moved to the right side of the
display to increase the accuracy of the
measurement. SC/H is accomplished by adjusting
the source subcarrier for a match of the two sine
waves. Each source to be matched should be
switched into the compare input of the Phaselcon
and calibrated until all sources in the system are
timed and phased.
In the certify mode of operation, a sine wave is
displayed that represents one cycle of subcarrier. A
vertical line represents the leading edge of sync
relative to subcarrier phase. In the compare mode of
operation, the certify and compare signals are
displayed. An additional vertical mark is displayed on
the left side of the display that shows relative
differences in horizontal timing between the two
composite signals. When H phasing reaches 200 nS
the vertical line appears on the right for accurate
timing.
The shadow mode of operation reduces the video
level behind the sine wave graphics. This area is
calibrated to represent 40 IRE units for accurate
burst level adjustment. The single sine wave signal
should just touch the top and bottom area of the
shadow signal. By comparing all video sources in the
system, a perfect burst match can be obtained.
LINK
ELECTRONICS, INC. ‹ 2137 Rust Avenue ‹ Cape Girardeau, MO 63703-7668
Phone 573 334 4433 FAX 573 334 9255
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