Definitions; Calready; How To Perform A Calibration - Agilent Technologies FieldFox N9923A User Manual

Definitions

DUT (Device Under Test) The cable, antenna, transmission line, amplifier, or
anything else that is connected to the FieldFox that is to be measured.
Calibration Standards - OPEN, SHORT, LOAD, and THRU
 OPEN, SHORT, and LOAD are „reflection‟ standards that are used during
 A THRU standard is used during some calibration steps to connect PORT 1 to
Calibration Reference Plane is the point (or points) at which the DUT and cal
standards are connected during a calibration. This can be at the FieldFox test
port connectors, or at the end of jumper cables or adapters.

CalReady

Every FieldFox contains a factory calibration that was performed at the port 1
and port 2 connectors over the entire frequency range of the FieldFox using a
number of data points that allows reasonable interpolation over the FieldFox
frequency range. This calibration, known as CalReady, allows you to immediately
make accurate measurements for a DUT that is connected directly at the test
ports (PORT 1 and/or PORT 2). CalReady corrects measurements when the
FieldFox is turned ON, when Preset is pressed, and when a measurement is
created with no other correction in place.
When measuring a DUT using a jumper cable or adapter - NOT a direct
connection to a test port connector – then for highest accuracy a QuickCal or
Mechanical Cal is recommended. CalReady can also be used to check the
integrity of the jumper cable that is attached to the test ports.
CalRdy
You can change the properties of the CalReady calibration. Learn more on page
60.

How to Perform a Calibration

In CAT, NA, or VVM Mode, press Cal 5 .
The following appears:
52
calibration. When an RF signal „hits‟ these components, the signals are
reflected in a predictable manner. These components can also be used to
terminate a DUT port during some measurements.
SHORT and OPEN standards both cause 100% of an RF signal to be reflected.
o
The difference between these two standards is what happens to the phase of
the reflected signal, which is beyond the scope of this discussion. Although
an OPEN standard is a precision component, simply leaving nothing
connected at the end of a cable can be a reasonable substitute for an OPEN.
A LOAD standard absorbs almost ALL of the incident signal and very little
o
signal is reflected back to the source.
PORT 2 in place of the DUT. A Flush THRU connection can be made when
cables that connect with the DUT can mate with each other. Learn more on
page 57. Otherwise, any reasonably short cable can be used as a THRU
standard.
is shown when a measurement is corrected using CalReady.
N9923A FieldFox User's Guide