HP HP 8712ET, User Manual, Page: 240 / 480

6-14 ET User’s Guide
Calibrating for Increased Measurement Accuracy
Calibration Choices
To Perform a Reflection Calibration
For a review of which systematic errors are removed by each type of
reflection calibration, see the descriptions below. These calibrations are
for measurements using the narrowband detectors.
For an example of performing a one-port calibration for a reflection
measurement, refer to
“Measuring Reflection Response” on page 3-32 .
In general, follow these steps when performing a reflection calibration:
1. Set up the analyzer for your measurement:
• Select or , .
• Enter operating parameters other than the default.
2. If performing a one-port reflection calibration, select a calibration kit
for the port at your calibration reference plane. Refer to “The
Calibration Reference Plane” on page 6-5 and “Calibration Kits” on
page 6-16 .
3. Press , and then one of the following softkeys:
Restoring the default calibration recalls error correction arrays that
were calculated at the factory or during servicing, and then permanently
stored in memory. This one-port calibration was performed using full
band (entire frequency span) and 401 frequency points, and corrects
systematic errors caused by directivity, source match, and frequency
response. It is quick and convenient but not as accurate at narrow
frequency spans. This calibration is also known as the default
calibration.
A one-port calibration prompts you to connect three measurement
standards: an open, a short, and a load. The analyzer measures each
standard across the frequency band you have defined, using the number
of points you have defined. The measurements of these standards are
used to remove systematic errors caused by directivity, source match,
and frequency response.
MEAS 1 MEAS 2
Reflection
CAL
Default 1-Port
1-Port