Performing Measurement Calibration; Using Flowgraphs To Identify Error Terms - Agilent Technologies N5242A Service Manual

General Purpose Maintenance Procedures
Error Terms

Performing Measurement Calibration

A calibration must be performed to allow the analyzer to calculate the error terms before
they can be used as a tool:
CAUTION Perform the following procedure only at a static-safe workstation, and wear a
grounded wrist strap.
This is important. If not properly protected against, electrostatic discharge can seriously
damage your analyzer, resulting in costly repair.
To reduce the chance of electrostatic discharge, follow all of the
recommendations outlined in
page 1-6, when performing the following calibration.
1. Connect a type-N cable to Port 2.
2. Perform a full 2-port calibration,
analyzer if necessary.

Using Flowgraphs to Identify Error Terms

Flowgraphs are a graphical representation of signal flow through the measurement path.
The flowgraphs in Figure
terms associated with measurement calibration for 1-port, 2-port, 3-port, and 4-port
configurations respectively.
Figure 8-1 Flowgraph of One-Port Error Terms for Port 1
where:
E = Error term
Subscript:
D = Directivity
S = Source Match
R = Reflection Tracking
The error terms are the same for a one port measurement on Port 2 (S
8-4
"Electrostatic Discharge Protection" on
FULL SOLT 2-Port
8-1, Figure 8-2, Figure
PNA Series Microwave Network Analyzers
. Refer to embedded help in the
8-3, and Figure 8-4 illustrate the error
Service Guide N5242-90001
N5242A
).
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