130
Options List
B.6
Four Configurable Outputs
B.6.1
General Description
This option adds four rear-panel outputs, which may be configured to any of the available signals in the
1201B/C series clocks. Note that there are many more jumper settings on the option board than the 1201B/C
is capable of providing. The configuration of the four outputs can be changed at any time via internal jumper
settings.
B.6.2
Specifications
General
Output Connectors:
BNC-type RF connectors (4)
Analog Outputs
Output Type:
LF353, with 560 Ω source resistance
Available Outputs:
modulated IRIG-B (B120 and B123)
IRIG-B, Modulated:
IRIG format B time code, modulated onto 1 kHz 3.8 Vpp sine wave
carrier; 2.8 Vpp into 50 Ω
Digital Outputs
Output Type:
High-speed CMOS (74HC126), 0 V to 5 V, with 47 Ω series resistor
Available Outputs:
unmodulated IRIG-B, 1 PPS, Programmable Pulse, Out-of-Lock
IRIG-B:
IRIG format B time code (unmodulated)
Cover Removal
To change the configuration of this option, the top cover of the instrument must be removed. Turn off the
instrument, and disconnect the power cord. Using a T25 Torx driver, remove the eight screws holding the
cover (and rack-mount ears, if used) in place, and lift the cover off.
B.6.3
General Information
Output selection incorporates is extremely flexible using jumpers on the option board. Each of the four
rear-panel BNC-type I/O connectors found on the rear panel can be configured to perform any of the
output signals available from the specific clock model. Figure B.3 shows the locations of board jumpers, and
Table B.1 indicates the available signals and their jumper positions.
Signal Selection
To choose a specific signal to be applied to a specific output connector requires setting three jumpers: (1)
output function, or the type of signal, like IRIG-B, (2) output mode, whether it’s an analog or digital signal,
and (3) the clock model in which the option is installed.
Jumper, Output Connector Correspondence
Use jumper JMP1 and JMP9 for output J2, JMP2 and JMP10 for output J3, JMP3 and JMP11 for output
J4 and JMP4 and JMP12 for output J5.
Output Function, Output Mode & Clock Model
To choose a specific signal for a specific output use jumpers JMP1 – JMP4. Signal positions are numbered
and explained in Table B.1.
Summary of Contents for 1201B
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