6-52
Calibrating for Increased Measurement Accuracy
Calibrating for Non-Coaxial Devices (ES Analyzers Only)
Perform the TRL Calibration
1. Press
.
2. To measure the "TRL THRU," connect the "zero length" transmission line between the
two test ports.
3. To make the necessary four measurements, press .
4. To measure the "TRL SHORT," connect the short to PORT 1, and press:
5. Connect the short to PORT 2 and press .
6. To measure the "TRL LINE," disconnect the short and connec t the TRL line from PORT
1 to PORT 2.
7. Press .
8. The line data is measured and the and softkey
labels are underlined.
9. To measure the "ISOLATION" class, press .
❏You could choose not to perform the isolation measurement by pressing
.
NOTE You should perform the isolation measurement when the highest dynamic
range is desired. To perform the best isolation measurements, you should
reduce the system bandwidth or activate the averaging function.
A poorly measured isolation class can actually degrade the overall
measurement performance. If you are in doubt of the isolation measurement
quality, you should omit the isolation portion of this procedure.
NOTE If loads can be connected to both port 1 and port 2 simultaneously, then the
following measurement can be performed using the
softkey.
10.Connect a load to PORT 2, and press .
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 FINI SHE D W IT H C AL. Press
.
The message COMPUTING CAL COEFFICIENTS will appear, indicating that the analyzer is
performing the numerical calculations of error coefficients.
Cal
CAL KIT
SELECT CAL KIT
USER KIT
RETURN
RETURN
CALIBRATE MENU
TRL*/LRM* 2-PORT
THRU THRU
S22 REFL: TRLSHORT
LINE/MATCH
DO BOTH FWD+REV
LN/MATCH1 LINE
LN/MATCH2 LINE
ISOLATION
OMIT ISOLATION
DONE TRL/LRM
DO BOTH FWD+REV
REV ISOL’N ISOL’N STD
FWD ISOL’N ISOL’N STD
ISOLATION DONE
DONE TRL/LRM