User Calibration And Preparations; Overview; Calibration Modes - Deepace KC901M User Manual

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and Preparation before Measurement

KC901M has been calibrated on its ports at factory already. Due to various

reasons, there may have deviations where the displayed curves may appear drifting

and not necessary reflect the exact situations in some cases. Yet in common

engineering applications, the deviations would not tarnish judgments thus there is no

need to conduct another calibration.

In terms of measurement, cables and adapters are commonly used but these

accessories will induce loss and phase shift. Furthermore, its performance is subject

to changes such as temperature and time, accompanied with drift. Under the

circumstances which interferences could seriously impact the results of the measure,

the instrument would need an immediate calibration.

Calibration data is only valid if measuring DUT under the same conditions (cables,

adaptors, temperature, analyzing bandwidth and sweeping speed etc.) as performing

the calibration; or else new errors will occur when any condition changes. In a word,

calibration conditions should be as close as it can be the actual situation of the test.

Try to reduce the frequency of changing different adaptors during testing,

particularly it's not recommended to put on an extra adaptor for whatever reason.

There are three kinds of calibrations in KC901M, factory calibration, system

calibration and user calibration.

Factory calibration: Instrument has a high-density full-band calibration, using

scaling algorithm to conduct more precise interpolation. The factory calibration is

saved into the instrument permanently; users cannot reset it or use it directly. But it

can override the system calibration by restoring factory settings.

System calibration: after the instrument comes out from the factory, the data of

system calibration is the same as factory calibration. System calibration can be used

directly and recalibrated by the users. It avoids further calibration since the System

Calibration in that in whichever frequency the device will execute sbasic error

correction. If it runs the "factory reset", the system calibration which is set by user will

be abandoned and the system calibration data will be the same as the factory

calibration.

User calibration: it can be set by user anytime. This calibration will do the

correction to every data point according to the actual setting. There will not be

Chapter 3 User Calibration

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