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 Network Analyzers using PXI software

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).

2 port diagram

Analyzer block diagram

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).

Absolute softkeyReceiver ports softkeys

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

 

 

 


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.


 

Rev.:  22.3