Link electronic Switch IEC 835 User Manual

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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