MTIE is thus a kind of peak detector. TDEV or “time deviation” by contrast is an “rms” measure of wander over various integration times or “taus”. TDEV is a root variance based on Allan Variance, a measure commonly used to characterize atomic clock stability.
What is relative time error?
a) Time error (TE): the difference between the time of a clock and the time of a specified reference clock. c) Relative time error (TER(A,B)): the difference between the time of clock A (TA) and the time of clock B (TB), i.e., TER(A,B) = TA – TB.
What is the error for time?
Time error is the difference between the time reported by a clock, compared to the time reported by a reference clock at the same instant. It is always relative to a reference, and has no meaning without a reference to compare to. How is it measured?
What is jitter and wander?
High-speed variations (phase variations above 10 Hz) in signal timing through a system are called jitter. Low speed variations in a signal or clock (10 Hz down to micro-Hertz) are termed wander.
What causes clock jitter?
Jitters in clock signals are typically caused by noise or other disturbances in the system. Contributing factors include thermal noise, power supply variations, loading conditions, device noise, and interference coupled from nearby circuits.
How do you find the maximum relative error?
Divide the Absolute Error by the Actual Value of the item in question to get Relative Error. The result is the relative error. Note that in most cases the unit of measurement of the absolute error will be the same as the unit of measurement of the actual value, and the units will cancel each other.
What is relative error in measurement?
Relative error (RE)—when used as a measure of precision—is the ratio of the absolute error of a measurement to the measurement being taken. In other words, this type of error is relative to the size of the item being measured. RE is expressed as a percentage and has no units.
What is the interval time?
A time interval is the amount of time between two given points in time. An example of this is: “The time interval between three o’clock and four o’clock is one hour.”
How do you calculate error limits?
Limiting Error and Relative Limiting Error
- Limiting Error is defined as the maximum deviation either in positive side or negative side in the measurement by an instrument from the nominal value or true value.
- Limiting Error δA = (Aa – As).
- The measured value may be greater than true value As or less than As.
What is maximum error?
The maximum error of estimation, also called the margin of error, is an indicator of the precision of an estimate and is defined as one-half the width of a confidence interval.
What is time interval error measurement?
Measurement. A given dataset (clock waveform) is first compared to some reference. Phase error (usually measured in nanoseconds) is calculated for an observation interval. This phase shift is known as time interval error (TIE). MTIE is a function of the observation interval.
What is MTIE (maximum time interval error)?
Maximum time interval error (MTIE) is the maximum error committed by a clock under test in measuring a time interval for a given period of time. It is used to specify clock stability requirements in telecommunications standards.
What is the difference between tolerance interval and absolute error?
This gives a tolerance interval in this measurement is 5.4 ± 0.05 cm, or from 5.35 cm to 5.45 cm. Any measurements within this range are “tolerated” or perceived as correct. Absolute error in measurement refers to the actual amount of error in the measurement. The absolute error of the measurement shows how large the error actually is.
What is the difference between absolute error and relative error?
For example, if you know a length is 3.535 m + 0.004 m, then 0.004 m is an absolute error. The absolute error is the difference between the measured value and the actual value. Relative error represents the ratio of the absolute error of the measurement to the accepted measurement.
