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Note: The TAI timescale also does not observe leap seconds. The TAI times-

cale is fixed to always be 19 seconds ahead of GPS time. As of 5-August-

2019 TAI time is 37 seconds ahead of UTC.

VersaSync's System timescale is configured via the MANAGEMENT > OTHER: Time Man-

agement screen, see "System Time" on page138.

Input timescales

Some of the inputs may not necessarily provide time to VersaSync in the same timescale

selected in the System Time’s timescale field. These inputs have internal conversions that

allow the timescale for the inputs to also be independently defined, so that they don’t have

to be provided in the same timescale. For example, the System timescale can be con-

figured as “UTC”, but the IRIG input data stream can provide VersaSync with “local” time,

with no time jumps occurring when the reference is selected.

If an output reference is using the GPS or TAI timescale, and the System Time is set to

“UTC”, then the GPS Offset box in the Edit GPS Offset window must be populated with

the proper timescale offset value in order for the time on the output reference to be cor-

rect. Some references (like GNSS) provide the timescale offset to the system. In the event

that the input reference being used does not provide this information, it must be set in

through the Offsets panel of the Time Management page.

Since the GPS and TAI offsets have a fixed relationship, only the GPS offset can be set. If

only the TAI offset is known, subtract 19 from it to get the GPS offset.

Note: If the System Time is set to the UTC timescale, and all output ref-

erences either use the UTC or “local” timescale, then it is not necessary to

set the GPS and TAI timescale Offsets.

Caution: It is imperative to configure any input reference’s timescales

appropriately. Otherwise, a System Time error may occur!

Output timescales

Some of the available VersaSync outputs (such as the ASCII data module’s outputs, etc.)

won’t necessarily output in the same timescale selected in the System Time’s timescale

field. These outputs have internal conversions that allow the timescale for the outputs to

also be independently defined, so that they don’t have to be provided in the same times-

cale.

140

CHAPTER 3 • VersaSync User Manual Rev. 7.0

3.2 System Time

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