Sigma BSG26N Service Manual
SIGMA ELECTRONICS, INC.
BSG-26 SERIES
INSTRUCTION MANUAL
WARNING: To reduce the risk of fire or electric shock, do not
expose this apparatus to rain or moisture.
GENERAL:
The BSG-26N and BSG-26P are Black Signal Generators which provide six (6) blackburst signal outputs. The
outputs are driven from the same internal source to ensure system synchronization. The design of the units provides
suitable operation for applications from complex total system timing to laying black on tape. The blackburst signal is
digitally derived from a temperature compensated oscillator. These units provide a stable output and do not require
any adjustments during operation. The outputs are present when power is applied.
suitable operation for applications from complex total system timing to laying black on tape. The blackburst signal is
digitally derived from a temperature compensated oscillator. These units provide a stable output and do not require
any adjustments during operation. The outputs are present when power is applied.
Superblack operation is selective via J1. With J1 jumper shorted across pins 1 and 2, the module will produce
superblack on all outputs. Superblack can be used when building a Multi-Pass special effect. The superblack signal,
approximately -7.5 IRE, provides a noiseless background that can be laid down on the tape for this application.
approximately -7.5 IRE, provides a noiseless background that can be laid down on the tape for this application.
The BSG-26N, NTSC version, provides outputs per RS-170A / SMPTE 170M standards. The BSG-26P, PAL
version, provides outputs per CCIR 624-4 standards. Specifications are provided in the SPECIFICATIONS section.
POWER:
The BSG-26 Series accommodates a wide range of line voltage from 90 VAC minimum to 255 VAC maximum.
The line frequency range is 50 to 60 Hz. The units utilize an IEC 320 inlet to accommodate the proper power cord set
for the line voltage connectors used in any geographical area. The combination of the wide voltage range and
universal inlet contributes to the diversity of applications where the BSG-26 will supply a dependable source of black
signal. The module internally regulates the bus voltage to +5 VDC (U8) and -5 VDC (U9). Circuit protection is provided
by an externally accessible fuse (Figure 1).
for the line voltage connectors used in any geographical area. The combination of the wide voltage range and
universal inlet contributes to the diversity of applications where the BSG-26 will supply a dependable source of black
signal. The module internally regulates the bus voltage to +5 VDC (U8) and -5 VDC (U9). Circuit protection is provided
by an externally accessible fuse (Figure 1).
FRAMES:
The BSG-26 units are assembled in a stand-alone box. The metal enclosure provides desirable shielding from
external EMI / RFI noise sources. See the section on SPECIFICATIONS for recommended operational conditions. The
units are capable of rack mounting with the optional RMK-26 Rack Mount Kit. This 1RU rack mount does not require
blank panels for unused portions. A total of three (3) Series 26 units may be mounted with a single RMK-26.
units are capable of rack mounting with the optional RMK-26 Rack Mount Kit. This 1RU rack mount does not require
blank panels for unused portions. A total of three (3) Series 26 units may be mounted with a single RMK-26.
CONNECTIONS:
The connectors are located on the rear panel. BNC connectors are used for the six outputs. Each of the
outputs are designed to drive a 75
Ohm load. The outputs must be terminated by a single end of line 75
Ohm
termination to ensure proper signal level. Unused outputs do not require a 75
Ohm terminating resistor.
REAR PANEL
Figure 1
2 of 4
OUTPUTS
1
2
3
5
4
6
FUSE
T40mA
250V
BSG-26
100-240V~
50-60Hz
6W
50-60Hz
6W
SIGMA ELECTRONICS, INC.
U
L
C US
CAUTION
RISK OF
ELECTRIC SHOCK
DO NOT OPEN