Irig Accuracy And Connection Requirements Pdf

irig accuracy and connection requirements pdf

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Inter-range instrumentation group timecodes , commonly known as IRIG timecode , are standard formats for transferring timing information.

The frequently used term IRIG signals refers to a whole group of serial time codes which use a continuous stream of binary data to transmit information on date and time. Individual IRIG code formats are distinguished by names consisting of a letter followed by a 3-digit number. The individual name determines the transmission speed and frame rate , whether the time code is modulated or unmodulated DC level shift, DCLS , and the kind of information included in the transmitted data.

IRIG timecode

The user can only change the Control Field field and Coded Expression field to allowed values for the Format field. Make sure the year is set correctly when the SecureSync is installed. If the year is not set correctly before NTP achieves time synchronization, it will use the value entered. The unit will also default to the year entered if it is powered down during the rollover of the year.

If the SecureSync was not switched on during the rollover, this value must be updated. See System Time for instructions on how to set the current year manually. See: Verifying the Validity of an Input Signal. The connector number is: J1. Note: These are nominal values only. Actual values will vary from unit to unit. To adjust the level precisely, connect an oscilloscope to the output connector when adjusting.

The connector numbers are: J2 and J3. SecureSync Online User Manual. You Are Here: You are here:. All Files. This is determined by the configuration of Format and Modulation Type. Control Function Field : IRIG signals have an optional section in the data stream that can be used to include additional information such as the present year, for example.

Fields conform to IEEC Fields conform to Spectracom Format : Year is included in Control Field but not in the same location as RCC output year is offset by one position. The Offset value is entered and displayed in nanoseconds ns. Additional cards will be numbered irg1 or above. The amplitude of the output is determined by the value entered in the Amplitude field. Timescale : Used to select the time base for the incoming time code data.

The entered Timescale is used by the system to convert the time in the incoming data stream to UTC time for use by the System Time. A local clock set up through the Time Management Page—This option will appear under the name of the local clock you have set up. The value of will cause the Mark amplitude to be about 5V p-p into high impedance.

A value of results in an output amplitude of about 9V p-p into high impedance. Download PDF Manual. Follow us on LinkedIn. Follow us on Twitter. Follow us on Facebook. Follow us on YouTube. Publishing Date: 5-March E-DCLS output only. E-AM output only.

IRIG Time Code Basics

Premium Membership. Learn from experienced power engineers. Substation automation is a mission-critical task and electric power utilities must synchronize across large-scale distributed power grid switches in a substation to enable smooth power transfer and maintain power supply integrity. Precise time synchronization is therefore required to ensure that substation devices have accurate clocks for system control and data acquisition, etc. Time synchronization is especially important for time stamping of sampled values IEC of current, and voltage values require accurate clocks inside the merging units.


Its accuracy is usually the same as the clock's one pulse-per-second output, since both signals are typically generated using similar drivers. This means that the IRIG-B unmodulated signal can easily be gener- ated with the fundamental accuracy of digital logic: a few tens of nanoseconds.


IRIG timecode

Common questions concerning connecting timing signals include: What are the different types of IRIG-B, and what are the differences? How do you connect multiple devices to one 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.

Over the years different organizations have published several standards defining the basic timecodes and also extensions to those time codes to meet the requirements of new applications.

Data Fields Included In Time Codes

This configuration then enables the chassis to operate as a subordinate in a virtual chassis chain, with the Ixia AFD2 as the master. Figure on page shows the AFD2 in operation with other chassis in a local chassis chain. Figure shows the Chassis Properties dialog with status information. The connection is determined to be either locked or unlocked. In the unlocked state, the chassis in the unlocked chain are not accurately time-synchronized to the rest of the chain.

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Time synchronization for transmission substations using GPS and IEEE Abstract: Time synchronization systems that utilize the global navigation satellite systems GNSS are widely used in the monitoring, control, and protection of transmission networks. They ensure that phasor measurement units PMUs can accurately monitor voltage phase angles, increase the accuracy of fault locators, enhance the capabilities of disturbance recorders, and allow differential feeder protection to use re-routable communication networks.

Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. The IRIG-B code, with a bit per second signalling rate and a 1 kHz sine wave carrier, was ideal for recording on voice-grade channels.

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