7.3 Output Signal Description
59
Drive Current, mA
Actual Drive Voltage, Vpp
0
10.0 (no load)
1
9.4
10
4.43
15
1.64
Table 7.1: Drive Current vs. Voltage
7.3
Output Signal Description
Model 1088A/B can provide twenty different digital signals and two analog signals that are listed
in Table 5.2. With an option card installed in Slot A or B, all of these signals are available at
the option card as well; see Appendix C for output options with listed digital signals. Most of the
information in this section is devoted to IRIG-B, its specifications and differences.
7.3.1
IRIG-B Description
IRIG-B is a complete serial time code that occurs once per second and, depending on the config-
uration, contains the day of year, hours, minutes, seconds, year and other important information.
The Model 1095A/C transmits Format B with four variations as seen in Table 7.2. Note that with
the newer IRIG Standard 200-04, two of the designations have changed: the older B000 has become
B004 and B120 has become B124.
Designation Old/New
Signal Type
Code Components
B000/B004
Pulse width code, No carrier
BCD
T OY
, CF, SBS
B003
Pulse width code, No carrier
BCD
T OY
, SBS
B120/B124
Sine wave, amplitude modulated, 1 kHz
BCD
T OY
, CF, SBS
B123
Sine wave, amplitude modulated, 1 kHz
BCD
T OY
, SBS
Table 7.2: Available IRIG-B Time Codes
The IRIG-B time code consists of 100 bits produced every second, 74 bits of which contain
various time, date, time changes and time quality information of the time signal. Consisting of
logic ones, zeros and position identifier bits, the time code provides a reliable method of transmitting
time to synchronize various equipment.
There are three functional groups of bits in the IRIG-B time code, in the following order: Binary
Coded Decimal (BCD), Control Function (CF) and Straight Binary Seconds (SBS). The BCD group
contains only time information including the seconds, minutes, hours and days, recycling yearly.
The CF group contains other time-related information including year, time quality, leap year,
pending leap seconds and parity. The SBS consists of the total elapsed seconds, restarting daily.
Position identifiers separate the various components of the IRIG-B time code.
Summary of Contents for 1088A
Page 4: ...iv ...
Page 6: ...vi ...
Page 18: ...xviii LIST OF FIGURES ...
Page 23: ...1 4 Attaching Rack Mount Ears to 1088A B Series Clocks 3 Figure 1 2 Attaching Rack Mount Ears ...
Page 24: ...4 Unpacking the Clock ...
Page 32: ...12 Front and Rear Panels ...
Page 38: ...18 Connecting Inlet Power Input and Output Signals ...
Page 46: ...26 GPS Antenna and Cable Information ...
Page 48: ...28 Setting Internal Jumpers Figure 5 1 Model 1088B Main Board ...
Page 76: ...56 The Setup Menus ...
Page 112: ...92 Serial Communication and Command Set ...
Page 127: ...B 4 Physical Dimensions 107 Figure B 1 Suggested Mounting of the AS0094500 Surge Arrester ...
Page 128: ...108 Using Surge Arresters ...
Page 145: ...C 5 Option 04 Parallel BCD Output 125 Figure C 4 Option 04 Output Jumper Settings ...
Page 146: ...126 Options List Figure C 5 Option 04 Board Layout and Jumper Locations ...
Page 166: ...146 Options List Figure C 12 Option 17 Board Layout and Jumper Locations ...
Page 187: ...C 16 Option 20A Four Fiber Optic Outputs 167 Figure C 22 Option 20A Jumper Locations ...
Page 194: ...174 Options List Figure C 24 Option 23 Internal Jumper Setup ...
Page 196: ...176 Options List Figure C 25 Option 27 Jumper Locations ...
Page 214: ...194 Options List Figure C 28 Option 29 Connector Signal Locations ...
Page 270: ...250 Options List ...