6-62
Calibrating for Increased Measurement Accuracy
Calibrating Using Electronic Calibration (ECal)
Perform the Calibration
1. Press .
When ECal is first selected (or when you select module A or module B), there is a small
initial delay so that the network analyzer can detect and download the calibration
information from the internal memory of the ECal module.
2. Press so that A is selected.
NOTE If you are calibrating with two modules, the overlapping frequency span will
be determined by the second module. Therefore, if you want to use the
calibration data of Module A in the overlapping frequency span, calibrate
using Module B first, and then calibrate using Module A.
3. Press the ECal calibration selection.
• The calibration choices for ES models ar e:
— performs a measurement calibration for reflection-only. Measures
of one-port devices or properly terminated two-port devices, at port 1 of an
S-parameter test set.
— performs a measurement calibration for reflection-only. Measures
of one-port devices or properly terminated two-port devices, at port 2 of an
S-parameter test set.
— performs a complete calibration for measurement of all four
S-parameters of a two-port device. This is the most accurate calibration for
measurements of two-port devices.
— performs an S11 and S21 enhanced response calibration
(forward direction). Enhanced response generates a 1-port cal for S11 and an
improved calibration over the response cal for S21.
— performs an S22 and S12 enhanced response calibration
(reverse direction). Enhanced response generates a 1-port cal for S22 and an
improved calibration over the response cal for S12.
• The calibration choices for ET models are :
— performs a reflection 1-port calibrati o n .
— performs a transmission (same as S21) and reflection
(same as S11) enhanced response cal ibr ation (forward direction). Enhanced
response generates a 1-port cal for reflection and an improved calibration over the
response cal for transmission.
Once the ECal calibration selection is made, the network analyzer performs the
calibration.
4. If you selected the manual thru calibration option, when the prompt is displayed,
remove the ECal module from the setup and connect the manual thru (the two test
ports connected together) as shown in Figure 6-22.
Cal
ECal MENU
MODULE A b
S11 1-PORT
S22 1-PORT
FULL 2-PORT
S11/S21 ENH. RESP.
S22/S12 ENH. RESP.
REFLECTION 1-PORT