Chapter 8
Timing, IRIG-B and Pulses
8.1
Introduction
This section should help to identify specific terminology related to timing signals in the Model
1094B, and clarify how to synchronize your external equipment, or IED’s. It should also answer
some basic questions, such as:
•
What are the different types of IRIG-B, and what are the differences?
•
How do you connect multiple devices to one 1094B timing output?
•
How far can you transmit timing signals?
•
What kind of cabling and connectors should I use?
The steps involved in getting your devices synchronized to the GPS are fairly simple and should
not take long to complete. To expedite the process, make sure that you know:
1. the type of timing signal each piece of equipment requires, and
2. how to enable the equipment to receive the timing signal.
Sometimes, you will need to set a physical jumper, or configure it through the instrument setup
program. Some equipment can auto detect the timing signal, so that nothing else is required, other
than connecting the cable.
8.2
Timing Output Description
The rear panel of the Model 1094B includes a number of different types of connectors as illustrated
in Figure 8.1. Starting from the right-hand side, there is a power inlet connector, a GPS antenna
connector, one event input connector, two DB-9 serial connectors, one SPDT relay connector and
four timing outputs. Except for the GPS antenna connector, each connector can have multiple
functions. In the sections that follow, you should be able to understand each function to correctly
configure them.
8.2.1
Standard Inputs and Outputs
The 1094B has four separate outputs that can produce either digital or analog timing signals as de-
scribed below. Digital signals include unmodulated IRIG-B, 1 Pulse per Second and Programmable
