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204

Dran-View 6 User Guide

Adjusting

for clock

drift

If you have two or more sites and one or more of their clocks

are too fast or too slow, first align their starting times as

described above. Once you have done this, repeat the

procedure with a point near the end of each file, but use

“Apply clock drift adjustment” from the X-axis popup menu

instead of apply clock offset. This should compensate for each

site’s clock drift. The time indicated in the topmost x-axis is

used.

The following two graphs explain how the timestamps are modified when applying

the “Clock offset adjustment”.

Before adjustment

After adjustment

T1=Instrument time, T2=”Real Time”

The blue curve is the reference Site, and the red curve is the secondary Site. ‘a’ indicates the clock

offset synchronization point.

The following two graphs explain how the timestamps are modified when applying

the “Clock drift adjustment”.

Before adjustment

After adjustment

Site. ‘b’ indicates the clock drift synchronization point.

! If both correction methods are to be used, it is preferable to apply the offset

adjustment at the beginning of the measurement and the drift adjustment at the end

of the measurement.

The method to adjust clock drift assumes that the clock drift is linear over time.

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Dranetz Guide Guia do Utilizador Página 204