Definitions; Calready; How To Perform A Calibration - Keysight N9923A FieldFox 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 75.
Learn how to see when your factory CalReady calibration was performed on page
144.

How to Perform a Calibration

 In CAT, NA, or VVM Mode, press Cal 5.
The following appears:
Calibration for NA, CAT, and VVM Modes
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 signal
o
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 70.
Otherwise, any reasonably short cable can be used as a THRU standard.
is shown when a measurement is corrected using CalReady.
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