4-20
Supplement for the User’s Guide (Firmware Version 7.68)
Calibrating Using Electronic Calibration (ECal)
Select the ECal Options
In addition to the standard ECal method, there are two options that you may want to use
when performing the electronic calibration. They are:
• ECal using a manual thru
Calibration using a manual thru is more accurate than calibrating using the thru
internal to the ECal module. (A zero-length thru is created by connecting the two test
port cables together.) The improved loss of the manual thru compared to the ECal
module's thru, increases the accuracy of other error terms in the correction. The
accuracy of the overall calibration is improved. Manual thrus can only be used with
ECal modules having connectors of the opposite sex.
• 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 the “Omitting Isolation Calibration” in Chapter 6, “Calibrating for
Increased Measurement Accuracy” in the user’s guide.)
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 4-21.
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 .
Cal
Cal
OMIT ISOLATION on OFF
ISOLATION on OFF
ISOLATION AVERAGES
AVERAGES
x1
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