Tait TB8100 Installation And Operation Manual

Contents

Tait TB8100 Installation And Operation Manual Manual pdf 42 page image

42 Programming T801-4 Installation and Operation Manual© Tait Electronics Limited September 20073.4 Viewing the Data LogThe Data Log screen displays the last 10 control measurements whichresulted in the master oscillator control voltage being updated. To open theData Log, click Log on the monitoring screen.The correction algorithm adjusts the DAC according to the Error. Whenthe error is less than 1, the Test Period is extended to a maximum of 30seconds. The best indication is 1 error (cycle) in 30 seconds (the masteroscillator runs at just over 107MHz).The information available on this screen is explained in the followingparagraphs.Time The time when the event took place. Note that the time displayed in thisfield is based on the computer’s clock, not UTC.SV The number of Space Vehicles (satellites) in use at the time of the event(refer to “Viewing the GPS Status” on page 44).Test Period The length of the count period, displayed in seconds.Error The difference between the master oscillator count and the count expectedover the test period. The system does not measure fractions of a second, sothis figure is rounded up to the nearest whole second. An error of 1indicates that the actual difference is between 0 and 1, an error of 2 indicatesthat the actual difference is between 1 and 2, etc.