TM 11-6625-3025-14/ET426-AA-MMA-010/E154 VII210/T.O. 33A1-8-902-1-1
Section II. DESCRIPTION AND DATA
1-7.
Purpose and Use. The
Test Pattern Generator SG-1223/T provides a
basic set of
video test patterns required to
align, adjust, troubleshoot, and verify repair of video display monitoring equipment.
1-8.
Description. The test pattern generator is a portable, self-contained instrument that provides the composite video
signal which contains vertical and horizontal sync information, blanking and pattern information necessary to evaluate the
performance of video display equipment.
The basic chassis is composed of a vertical card file which contains the replaceable, plug-in power regulator and
pattern development circuit cards. Removing the top panel provides access to the plug-in circuit cards. The front panel
assembly includes all controls for operating the test pattern generator. Power and signals connections are made at the
rear of the case. Operating power is supplied by power regulators mounted on a heat sink attached to the rear panel.
Vent openings on the top panel allow cooling air to circulate through the interior of the unit.
1-9.
Technical Characteristics.
a.
Sync Generator Section.
(1) Output signals (one each of the following pulses):
Type
H drive, V drive, blanking, sync
Level
4v peak
Polarity
Negative-going pulses
75 ohm source termination
Risetime
Nominally 0.1 usec
Coupling
AC (capacitive)
(2) Input signal requirements: None
(3) Controls:
External
None
Internal
H front porch
H sync width
H blanking width
H drive width
Pulse amplitude
(4) Scan rates: 2:1 interlace, at 675/60 scan rate
Rate
Lines per frame
675
Lines per field
337.5
Field rate
60
40.500 KHz
H rep rate
20.250 KHz
Total H line
49.4 usec
Active H line
42.4 usec
1-4