User`s guide

6-54
Calibrating for Increased Measurement Accuracy
LRM Error Correction
11.Connect the load to PORT 1, and press:
12.You may repeat any of the previous steps. There is no requirement to go in the order of
steps. When the analyzer detects that you have made all the necessary measurements,
the message line will show PRESS 'DONE' IF FINISHED WITH CAL. Press
.
The message COMPUTING CAL COEFFICIENTS will appear, indicating that the analyzer
is performing the numerical calculations of error coefficients.
NOTE You can save or store the measurement correction to use for later
measurements. Refer to Chapter 4 , “Printing, Plotting, and Saving
Measurement Results” for procedures.
13.Connect the device under test. The device S-parameters are now being measured.
LRM Error Correction
Create a User-Defined LRM Calibration Kit
In order to use the LRM technique, the calibration standards characteristics must be
entered into the analyzer's user defined calibration kit.
The following steps show you how to define a calibration kit to utilize a set of LRM (LINE,
REFLECT, MATCH) standards. This example LRM kit contains the following:
• zero length LINE
• "flush" short for the REFLECT standard (0 second offset)
• 50 ohm termination for the MATCH (infinite length line)
NOTE LRM with a zero length line is sometimes referred to as TRM (THRU,
REFLECT, MATCH).
Modify the Standard Definitions
1. Press the following keys to start modifying the standard definitions:
2. To select a short, press . (In this example, the REFLECT standard is a
SHORT.)
FWD ISOL’N ISOL’N STD
ISOLATION DONE
DONE TRL/LRM
Preset Cal
CAL KIT
MODIFY
DEFINE STANDARD
1 x1