Agilent Technologies E5070B, Руководство пользователя

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Chapter 4 179
Calibration
Confidence Check on Calibration Coefficients Using ECal
4. Cal
ibra
tion
Confidence Check on Calibration Coefficients Using ECal
NOTE This function is available with firmware version 3.50 or higher.
Using the ECal module, the E5070B/E5071B lets you verify the obtained calibration
coefficients to determine whether correct measurement is possible with them.
The E5070B/E5071B can set ECal to the state used to verify the measurement parameters
and then copy the appropriate characteristics of that verification state to the memory trace
from the ECal's built-in memory. This is done according to the measurement parameters of
the active trace of the active channel. While measuring ECal in this specified state, you can
compare the measurement results with those of the E5070B/E5071B and with the
appropriate measurement results stored in ECal in several different ways. These include
simultaneously displaying the data and memory traces or displaying the math operation
results between the data and memory traces. This enables you to verify the correctness of
measurement for each measurement parameter when the obtained calibration coefficients
are used.
Operational procedure
Follow these steps to verify the reliability of the calibration coefficients.
Step 1. Connect the USB cable between the USB port of the ECal module and that of the
E5070B/E5071B. You can make this connection while the E5070B/E5071B’s power is
ON.
Step 2. Press or to select the channel for which you want to perform the
verification.
Step 3. Press .
Step 4. Select the S-parameter you want to verify.
NOTE You cannot verify the mixed mode S-parameter.
Step 5. Connect the test ports of the E5070B/E5071B corresponding to the selected S-parameter
(for example, ports 1 and 2 when the S-parameter is S21) and the ports of the ECal module.
NOTE If you don’t use all of the ECal module’s ports, connect terminations to the unused
ports.
NOTE You can use any of the Ecal’s ports for this connection. The connected port is automatically
detected and measurement is performed.