Link electronics System Timing and SC Phase Instrument... User manual

800 SERIES
Timing & SC PhaseSC/H
PhaseIcon Instrument
MODEL IEC-835
LINK ELECTRONICS, INC.
SYSTEM TIMING AND SC PHASE INSTRUMENT
MODEL IEC-835
FEATURES
SC/H Phase
H. Timing
Burst Amplitude
Easy to Operate
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.
ThevisualdisplayofthePhaselconiskeyedoverthe
selected input. The Phaselcon displays the graphics
for SC/H in the lower ½ of the video display.
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. Inthe compare mode of
operation, the certify and compare signals are
displayed.Anadditionalverticalmarkisdisplayedon
the left side of the display that shows relative
differences in horizontal timing between the two
compositesignals. WhenH phasingreaches 200nS
the vertical line appears on the right for accurate
timing.
Although the primary function of the Phaselcon is
SC/H certification, it does system timing and burst
amplitude as well. Timing of two video sources is
accomplishedbyadjustingthesourcetiminguntilthe
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.
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
shadowsignal.Bycomparingallvideosourcesinthe
system, a perfect burst match can be obtained.
LINKELECTRONICS, INC. 2137 Rust Avenue Cape Girardeau, MO 63703-7668
Phone [phone] FAX [phone]
MADE IN THE USA

continued from front
The RS-170A specification states that the
relationship between horizontal sync and
subcarrier of field one, line 10 shall have a zero
crossing in the up cycle of subcarrier and be in
coincidentwith theleading edgeof horizontalsync
and have a tolerance of ±40 degrees. The
Phaselcon is capable of displaying a much tighter
tolerance, in the order of ±2 degrees of Subcarrier
phaseand±2nS ofHorizontal timing.Inadditionto
these features, the IEC-835 has a unique ability to
display Subcarrier distortion. The sine wave
display is referenced to the actual incoming burst.
All display timing is reference locked in such a
completely unique way that parameter drift is all
but eliminated.
SPECIFICATIONS
The IEC-835 displays an extremely accurate graphics representation of the video source being measured.
INPUT:
REFERENCE & COMPARE:
Level:.................................................... 1.0voltp-pnominal,composite
Impedance: ............................................. Loop through, Bridging Differential
ReturnLoss: .................................................................. >40dB
Connectors: .................................................................... BNC
OUTPUTS:
Number: ................................................... Twocompositevideo signals
Level:........................................................1.0voltp-p±5%,unitygain
Impedance: ..............................................75ohms±1%,sourceterminated
Connectors: .................................................................... BNC
ACCURACY:
Certify Mode: ..........................................................±2°,10/90%APL
Compare Mode: .......................................................±2°,10/90%APL
FRONT PANEL CONTROLS:
Certify/Compare:..........................................SelectsCertifyorCompareMode
Operate/Bypass: .................................. SelectsthePhaselconorbypassoperation
Normal/Shadow: ............................................... SelectstheShadow Mode
AC On/Off: ..........................................................ACPowerON/OFF
POWER:
Input AC: ...........................................................120 VAC, ±15 Volts
Power:..................................................................... 18Watts
MECHANICAL:
Height:.................................................................... 1.75Inch
Width: .................................................................... 19Inches
Depth: ..................................................................... 8Inches
Weight: ..................................................................... 4.5Lbs.
LINKELECTRONICS, INC.
2137 Rust Ave.
Cape Girardeau, MO 63703
Phone: [phone]
FAX: [phone]
PROFESSIONAL SERIES-
stand-alone system products--by LINK IEC-835/083002