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This information is from Tardis help manual

Estimate of clock drift

This is an estimate of how much your PC’s clock would drift if Tardis 2000 were stopped now. It may require a long time (hours) before this value will settle down to a reasonable value. It is only going to settle down if you are using SNTP, GPS, or other accurate protocols. The other protocols aren’t accurate enough.

Minimum correction allowed/Adjust clock frequency if below

Tardis 2000 checks that any time correction is worth bothering about. The Minimum correction allowed setting specifies what is reasonable. This is useful if you want to avoid frequent trivial changes to the time that might upset other applications. It is also possible to specify that any correction is allowed by sliding the control all the way to the left. On the service version this option’s meaning changes if the ‘Adjust clock frequency’ is set. When this is set ALL time corrections are used even small ones. They are used to adjust the frequency of the PC’s clock to make it drift less. When this is used the value of this setting determines when the clock is stepped rather than the frequency adjusted. We have the setting set to 20 ms

Maximum correction allowed

Tardis 2000 validates the time received from the server by checking that the amount of correction is not so far out that it must be wrong. The Allowable correction settings specify what is reasonable. This is useful if your timezone is wrong or your timeserver has gone mad. We have this setting set to 1 minute

How often the time is set Every four minutes the system is synchronised

Adjust automatically

If this is set Tardis 2000 will gradually adjust how often it checks the time. This option works in conjunction with the Minimum allowed and Maximum allowed settings. If a correction is less than the minimum the time is increased. If a correction is made the time is decreased. The minimum correction setting effectively becomes the definition of the required accuracy.This is set to on

Important:You must stop any programmes or background utilities from synchronising windows except the two applications you are using to control the computer synchronisation time ,to stop your window time services from running you can disable this by going into Windows Control Panel, then clicking on the Administrative tools then click on services, the name of the service to stop is called Windows time, right click on this and click on the properties this willl bring you into the settings, you will see a box called start up set this to disabled.