OPERATION (cont.)
1.
White level is automatically gain-regulated to make the white
level (luminance) exactly 100 I.R.E. White level is not clipped
but retains a linear gray scale. Level is adjusted up as well as
down to keep the luminance level correct. Output video level is
regulated to 1 volt peak-to-peak.
2.
Chrominance (color information) is automatically corrected, thus
compensating for cable slope losses up to 5000 feet and other
sources of high frequency attenuation.
3.
Back Porch Clamping eliminates all incoming low frequency
interference such as 60 cycle ground loops, and also cancels low
frequency distortion in the video signal. Common Mode interference
is also eliminated.
Since ACE472 automatically processes sync and picture peak
voltages independently without altering the time relationships
within the video signal, the timing between SYNC and COLOR BURST is
not altered. Therefore horizontal Sync, Color Burst Timing, and
Chrominance Phase (SC/H) retain their original relationship. This
feature distinguishes the ACE472 from any Proc Amp that strips and
re-inserts new SYNC signals.
The ACE472 insures constant standard video signals even though
video from a multitude of variable level sources are
used.
This
helps to insure correct CCTV operation without loss of signal
due to over or under video level and improves overall picture
quality.
FRONT PANEL INDICATORS
A "VIDEO ON" indicator for each channel shows that a video signal
is present at that input to identify signal continuity.
BY-PASS PUSH BUTTON OPERATION
The ACE472 has a by-pass mode of operation. The switch on the front
panel is used to set the amplifier and equalizer to unity gain, (no
correction). With this push button you can make a quick comparison
between active control and no control. Use this button to see the
picture improvement gained by the ACE472. Look at the video image and
push the button, compare the before and after picture quality.
Depressing the by-pass button also enables the operator to examine
the picture without automatic correction, so that the action of the
camera iris controls may be observed, and if necessary, be adjusted.
CARE AND MAINTENANCE OF THE ACE472
Care should be taken not to subject the ACE472 to extreme
moisture or temperatures outside normal operating range. There are no
periodic maintenance adjustments to be made on the ACE472. If the unit
does not function properly it should be returned to the factory for
repair. There are no field adjustable controls.
ACE472.ISB PAGE 4 OF 4
