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3-8 Electronic Calibration Modules Reference Guide
Operating ECal Module
Setting Up a Calibration
3-
Calibration Methods for Non-Insertable Devices
A “non-insertable” device means that the measurement ports cannot be
connected together to establish a THRU connection during calibration for
transmission. Because the module typically forms the THRU path, you can use
one of the following methods to perform a calibration for non-insertable
devices:
Configure ECal Module the Same as Device
The simplest way to calibrate for non-insertable devices is to configure an ECal
module with the same connector types as the DUT. RF ECal modules can be
configured with mixed connectors to match the connector types on the DUT.
Refer to
“Models and Options” on page 1-4
. You can also configure the
module with different connector types by performing a User-Characterization
(see below).
Use Adapter Removal Calibration
Adapter removal provides an accurate way to calibrate for non-insertable
devices, but requires extra calibration steps to characterize the adapter. The
adapter type used for this calibration must be a -m- to -m- or -f- to -f- and
have the same connector type as the module. In addition, the module must
have a male connector on one test port and a female connector on the other
test port (of the same connector type).
Use Unknown Thru Calibration
Unknown Thru calibration is currently available with all PNA network analyzers
except the E8801/2/3A. It is easy to perform and can be used on any two ports
when using a multiport PNA. It causes minimal cable movement if the Thru
standard has the same footprint as the DUT. In fact, the DUT can often be the
Thru standard. A 1-port calibration is performed on both ports. The unknown
Thru is connected between the two ports and measured. Next, the user must
confirm the Estimated Delay. This requires knowing the phase response to
within 1/4 wavelength. If the phase response is unknown, the Delay value can
be measured independently and entered in the dialog box.
Perform a User-Characterization
Normally, when you perform a calibration with an ECal module, the error terms
for a calibration are computed using the factory characterization (data) stored
in the module. User-Characterization allows you change the characterization
of the module in two ways:
— Change the connector configuration: allows you to add an adapter or fixture
to the test port of the module and embed the effects into the
characterization of the module. The result of the new characterization
extends the reference plane from one or more of the module’s test ports to
those on the adapter (or fixture).
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