6-61
Calibrating for Increased Measurement Accuracy
Calibrating Using Electronic Calibration (ECal)
• ECal using isolation averaging
During the isolation measurement portion of ECal, you are actually measuring
instrument crosstalk. Typically, the data during this measurement is near the noise
floor. (See also "Omitting Isolation Calibration" on page 6-4.)
When the crosstalk is near (or in) the noise floor, one way to reduce the noise is to turn
on the isolation averaging. When the random noise of the instrument is averaged, its
magnitude declines. As the energy of the trace is averaged, the displayed data becomes
smoother. When the random noise is reduced, the network analyzer display shows the
non-random crosstalk data.
NOTE If you are performing an ECal using two modules, selecting either option sets
up the option to be performed with both modules.
To Select the Manual Thru Calibration Option
1. To select the manual thru calibration option, press
.
2. Press until ON is selected.
3. Press .
4. Continue with step 2 of "Perform the Calibration" on page 6-62.
To Select the Isolation Calibration Option
1. To select the isolation calibration option, press .
2. Press until OFF is selected.
The isolation measurement is normally off. Therefore, the default setting for the
softkey is ON. When isolation is not omitted
( ), isolation standards are measured.
3. Press , enter the isolation averages numeric value on the
front panel keypad, and then press .
NOTE The isolation averaging default is set to take 10 sweeps. This isolation
averaging value is less than the network analyzer default sweep averaging
value of 16.
4. Press .
5. Continue with step 2 of “Perform the Calibration.”
Cal
Cal
OMIT ISOLATION on OFF
ISOLATION on OFF
ISOLATION AVERAGES
AVERAGES
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