FPS camera sync and reset chassis Page: 4 of 25
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FPS VIDEO
31 DIVIDER
14 VPP
2 33 VPP
DISK
DISTRIBUTION
AMPS
LECROY
DIGITIZER
PRE-FIDU SIGNAL DISTRIBUTION
' VCTU
ANALOG
DISK
VIDEO
PATCH
PANEL
HV PULSER
[DISTRIBUTION,
FI DU
HPI3IIAXY
HP 81 OSC
HPI3IIA XY
MICROWAVE
RECEIVERS
MICROWAVE
TRANSMITTERS
2:1 DIVIDER,
2 :| DIVIDER ,R
2' I DIVIDER
SYNC-RESET
T8F SIGNALS
FIDU NON-FPS VIDEO FPS RESET
Fig. 2.
Typical FPS camera video signal distribution and recording system. R, through Rt are 25 tl,
/?, through i?18 are 16.7 ft, and RT is 50 tl.
conventional TV camera signals) that must be at-
tenuated, rather than amplified, before being chan-
neled to recording media. The distribution system is
primarily passive with fan-out provided by commer-
cial power dividers. The three-way dividers are
Bishop Instruments, Inc. model 080-101; the two-
way dividers are GenRad model 814-TPDL. (Note
that the large video output amplitude of an FPS
camera makes it possible to avoid the noise and dis-
tortion inherent in distribution amplifiers.) The
calculated video amplitudes at the recorders and at
the sync and reset chassis are also shown in Fig. 2.
IV. FPS CAMERA-RECORDING SYSTEM
SYNCHRONIZATION
The sync and reset chassis synchronizes the
remote free-running FPS camera with the event to
be viewed and with the video signal recorders (other
than the analog disk and the oscilloscope). The chas-
sis provides precise reset timing and an erase func-
tion for the FPS camera, furnishes timing signals,
deflection, and CRT unblanking for the XY displays
and the laser scanner-film recorder, and supplies
timing signals for the digital recorders. The unit was
designed by LASL Group P-15 and fabricated by
EG&G Inc. Soecial Measurements group. A block
diagram of the timing, sweep, and unblanking func-
tions is shown in Fig. 3. The reset and erase func-
tions are described in Sec. V.
The sync and reset chassis provides two sources of
timing signals for synchronizing the remote FPS
camera and the recorders: (1) a resettable sync
generator, identical to the sync generator of the
remote FPS camera, that can be reset to within
±12.5 ns of the time at which the remote FPS
camera itself is reset (Sec. IV.A); and (2) a sync-
stripper circuit that extracts timing information
from the composite video waveform of the FPS
camera (Sec. IV.B). Factors influencing the choice
of resettable sync generator or sync stripper as the
sync source are discussed in Sec. IV.C. Timing
signals from either sync source operate the sync,
sweep, and unblanking circuits required by the
various recorders (Sec. IV.E,.
A. Resettable Sync Generator
The resettable sync generator synchronizes the
remote FPS camera and the recorders by syn-
chronizing two independent identical sync
generators. (It should be noted that this scheme of
synchronizing two independent sync generators ac-
complishes a task usually performed by much more
3
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Yates, G. J. FPS camera sync and reset chassis, report, June 1, 1980; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1070093/m1/4/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.