LINK ELECTRONICS, INC.
SYSTEM TIMING AND SC PHASE INSTRUMENT
MODEL IEC-835
MADE IN THE USA
PhaseIcon Instrument
MODEL IEC-835
800 SERIES
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.
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.
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.
Timing & SC Phase SC/H
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
accomplished by adjusting the source timing until the
two vertical lines on the left side of the display are
superimposed. As the source timing approaches 200
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
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
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
coincident with the leading edge of horizontal sync
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
phase and ±2nS of Horizontal timing. In addition to
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:.................................................... 1.0 volt p-p nominal, composite
Impedance: ............................................. Loop through, Bridging Differential
Return Loss: .................................................................. >40dB
Connectors: .................................................................... BNC
OUTPUTS:
Number: ................................................... Two composite video signals
Level:........................................................1.0 volt p-p ±5%, unity gain
Impedance: ..............................................75 ohms ±1%, source terminated
Connectors: .................................................................... BNC
ACCURACY:
Certify Mode: ..........................................................±2°, 10/90% APL
Compare Mode: .......................................................±2°, 10/90% APL
FRONT PANEL CONTROLS:
Certify/Compare:..........................................Selects Certify or Compare Mode
Operate/Bypass: .................................. Selects the Phaselcon or bypass operation
Normal/Shadow: ............................................... Selects the Shadow Mode
AC On/Off: .......................................................... AC Power ON/OFF
POWER:
Input AC: ...........................................................120 VAC, ±15 Volts
Power:..................................................................... 18 Watts
MECHANICAL:
Height:.................................................................... 1.75 Inch
Width: .................................................................... 19 Inches
Depth: ..................................................................... 8 Inches
Weight: ..................................................................... 4.5 Lbs.
LINK ELECTRONICS, INC.
2137 Rust Ave.
Cape Girardeau, MO 63703
Phone: 573 334 4433
FAX: 573 334 9255
PROFESSIONAL SERIESstand-alone system products--by LINK
IEC-835/083002
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