Keysight Technologies Infiniium MSOV 084A, Руководство по обслуживанию

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16 Infiniium V-Series Oscilloscopes Service Guide
2
Calibration
What is a Calibration?
A calibration is simply an oscilloscope self-adjustment. The purpose of a
calibration is performance optimization.
There are four levels of calibrating an Infiniium V-Series oscilloscope, with each
successive level being a superset of the previous one:
• An
environmental calibration is a quick fine-tune of response. It includes a
minimum set of calibrations and should be run when there are changes to the
operating environment around the oscilloscope, such as changes in air flow,
temperature, humidity, or the placement of other instruments near the
oscilloscope. It can also be run prior to making critical measurements where
absolute best accuracy is required. The environmental calibration takes only a
few minutes to run, and is easily accessible through a button in the Calibration
dialog box. Users can run this cal.
• A user calibration , also known as a self calibration , is a more rigorous set of cals
that can be run by oscilloscope users. It includes the environmental cal.
With a user calibration, you may optionally choose to run time scale
calibrations and interleave correction calibrations. These cals do not run by
default, and they require additional equipment. A user calibration takes about
2-1/4 hours, including the time required to change cables from channel to
channel.
• A service calibration is performed only by Keysight Service Center technicians.
With a service calibration the 50
Ω
input resistance calibration is performed, in
addition to everything calibrated with the user calibration. The time scale and
interleave correction calibrations are run by default, though they can be turned
off. Additional equipment is required to run a service calibration. A service
calibration takes about 2-1/2 hours.
• A factory calibration includes the complete set of calibrations, including time
scale and interleave correction, plus other calibrations. A factory calibration is
normally performed only once, during production of the oscilloscope. All of the
factory calibration factors are stored into flash RAM on the acquisition board so
that the calibration factors determined by the factory calibration are preserved
even if the hard drive is replaced or reformatted.