Hi,

I need some help about how to calculate type B system uncertainty for PNA E8364B. I try to use the PNA uncertainty calculator from agilent, but the uncertainties are too big. Then i found PNA manual number E8364B-90026 has listed all possible uncertainty term as below:

Measurement uncertainty is defined as the sum of:

• the residual systematic (repeatable) errors, and the random (non-repeatable) errors in the measurement system after calibration.

The systematic errors are:

• directivity, • source match,• load match,• reflection and transmission frequency tracking, and isolation (crosstalk).

The random errors include:

• noise, • drift, • connector repeatability, and • test cable stability.

since we have all possible errors involved to system errors. what formula i need to use combine all these together and how to get the value for each error term above. I need that for calculate expanded uncertainty of all 8 parameters of 2.4mm agilent attenuator model 8490D. i already have done the measurements in db for 8 parameters.

I need some help about how to calculate type B system uncertainty for PNA E8364B. I try to use the PNA uncertainty calculator from agilent, but the uncertainties are too big. Then i found PNA manual number E8364B-90026 has listed all possible uncertainty term as below:

Measurement uncertainty is defined as the sum of:

• the residual systematic (repeatable) errors, and the random (non-repeatable) errors in the measurement system after calibration.

The systematic errors are:

• directivity, • source match,• load match,• reflection and transmission frequency tracking, and isolation (crosstalk).

The random errors include:

• noise, • drift, • connector repeatability, and • test cable stability.

since we have all possible errors involved to system errors. what formula i need to use combine all these together and how to get the value for each error term above. I need that for calculate expanded uncertainty of all 8 parameters of 2.4mm agilent attenuator model 8490D. i already have done the measurements in db for 8 parameters.