O,S,L Calibration - Keysight N9912A User Manual

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 Press Finish.
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Using QuickCal with a Long Jumper Cable
QuickCal requires a sufficient frequency span to adequately characterize the jumper
cable (the cable between the instrument port and the DUT). If a 'Cal Failed' error
appears and you connected the optional Load standard, then increase the frequency
span of the measurement until the error no longer appears. After the calibration, you
can then decrease the frequency span as needed and rely on interpolation. Learn
more about Interpolation on page 64.
QuickCal is also limited in how much jumper cable loss it can tolerate. If QuickCal
without the load is failing, then measure the load during the QuickCal to see if that
resolves the issue.
O,S,L Cal
An OPEN, SHORT, LOAD Cal is performed using discrete standards from a Cal Kit.
Several Cal Kit definitions are built into the FieldFox firmware.
NOTE Visit
Kits. Also at this website, download DataLink software that allows you to edit Cal Kit
definitions or add a new Cal Kit.
O,S,L Cal is extremely accurate when performed using the recommended Cal Kits
with standards that are in clean and good repair, and when using correct connection
procedures.
62
Step 1
1. Disconnect the DUT from the FieldFox.
2. If a jumper cable or adapter is required to connect the DUT to the FieldFox,
connect those components to the FieldFox RF Out connector NOW. The
effects of those components will be measured and removed during the
calibration, and only the effects of the DUT will be displayed in the
measurement results. These should be high-quality components!
3. Do NOT connect anything at the point where the DUT connects.
4. Then press QuickCal.
Step 2
Connect a Load standard at the point where the DUT will be connected and
press under the following conditions:
Measure
When a jumper cable has too much loss. If a 'Cal Failed' error appears and you
skipped the Load measurement, then perform the Cal again but measuring the
Load.
When your DUT has high return loss such as the reject band of a filter. Then
measuring the load improves accuracy. Even with the optional Load, phase
accuracy begins to degrade when the return loss is greater than about 20dB.
Press in all other cases and when making DTF measurements.
Skip Step
Measuring a load would do little to improve accuracy.
is shown on the screen when a QuickCal is correcting the
Cal ON Q
measurement.
www.keysight.com/find/fieldfoxsupport to see a complete list of supported Cal
FieldFox User's Guide