Agilent Technologies N1996A-503 User Reference page 227

Calibrate
Use this key to start the process of calibrating your measurement. Follow the instructions
on the screen to complete the calibration process.
Mode
Key Path
The Distance to Fault calibration (when it is performed with Frequency Range set to
manual) is the same calibration as performed for the Return Loss and One-Port Insertion
Loss measurements. If you have already calibrated for any of these three measurements,
the calibration will apply to the other two measurements and "Calibrated" (together with
the frequency range over which the calibration was performed) will be displayed on top left
of the screen for all three.
The Distance to Fault calibration (when it is performed with Frequency Range set to Auto)
is only valid for other Distance to Fault measurements that are also performed with
Frequency Range set to Auto, and then only if the calibrated frequency range falls within
the previously calibrated frequency range.
If you have not previously performed a calibration, the word "Factory Calibration" appears
at the top left of the measurement screen.
It is important that you keep the calibration frequency range as close as possible to the
actual sweep frequencies you intend using for the measurement or measurements.
Calibrating over a large frequency range (1 GHz, for example) when you only intend
measuring over a smaller frequency range (a few tens of kHz, for example) will induce
inaccuracies into your results.
NOTE
The Calibrate Start/Stop frequencies define the frequency range over
which the CALIBRATION will take place, and do NOT define the
frequency range over which the MEASUREMENT will be made.
If you plan to perform a combination of One-Port Insertion Loss measurement, Return
Loss measurement, and Distance to Fault measurements using a frequency range that you
will set manually, you can perform one calibration for all three measurements as long as
you calibrate over a frequency range that incorporates all three of your measurements, and
as long as your cables do not change. For this reason, if you are doing Distance to Fault
measurements (using a frequency range that you have set manually) as well as any type of
Insertion Loss measurement, Agilent recommends that you select your cable type before
performing calibrations. Press
cable type.
The calibration remains valid until you do any one of the following:
• set the Distance to Fault frequency range to Auto. Note that the calibration will become
valid again as soon as you switch from Auto back to Manual Frequency Range.
Chapter 3
Stimulus / Response
FREQ/Channel, Calibrate
Meas, Distance to Fault, Meas Setup, Cable Type
Mode
Distance To Fault
to set the
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