Absolute measurements are measurements of the absolute power of a signal at a receiver input. Unlike relative measurements of S-parameters, which represent a relation between the signals at inputs of two receivers, absolute measurements determine the signal power at the input of one receiver. A two-port Analyzer has four independent receivers: A, B, R1, R2 (See figure below).
The R1 and R2 are reference signal receivers. The A and B are test signal receivers. The A and R1 receivers are located in Port 1. The B and R2 receivers are located in Port 2. There are eight types of absolute measurements depending on the port number (See table below).
Symbols |
Definition |
|---|---|
A(1) |
Test signal receiver A (Source Port 1) |
A(2) |
Test signal receiver A (Source Port 2) |
B(1) |
Test signal receiver B (Source Port 1) |
B(2) |
Test signal receiver B (Source Port 2) |
R1(1) |
Reference signal receiver R1 (Source Port 1) |
R1(2) |
Reference signal receiver R1 (Source Port 2) |
R2(1) |
Reference signal receiver R2 (Source Port 1) |
R2(2) |
Reference signal receiver R2 (Source Port 2) |
A measured absolute parameter is set for each trace. The trace to which the function is applied must be preselected as active (See Selection of Active Trace/Channel).
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To select absolute measurement, click softkeys: Measurement > Absolute Then select the required parameter: •Receiver A, Source Port 1 •Receiver B, Source Port 1 •Receiver R1, Source Port 1 •Receiver R2, Source Port 1 •Receiver A, Source Port 2 •Receiver B, Source Port 2 •Receiver R1, Source Port 2 •Receiver R2, Source Port 2 |
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note |
In absolute measurement mode, dBm measurement units are used for logarithmic magnitude format, and W measurement units are used in linear magnitude format. Other formats are not applicable to absolute measurements. |
