Section 10: Calibrating the Model 9100: Calibration Mode
10.2-5
Final Width = 215mm
TODAYS DATE
TIME
10.2.4
Special Calibration
10.2.4.1
Selecting Special Calibration
Pressing the Special softkey in the Calibration Mode screen results in the Special
Calibration screen shown below being displayed, in which the only active softkey is the
one labelled Chse — DAC (Characterise DAC).
The Characterise DAC operation comprises a set of fully automatic internal adjustments
which, using ratiometric techniques, calibrates resistor ratios and AC frequency responses.
Chse—DAC
also checks and calibrates the linearity of the Model 9100's 20-bit D/A
converter which is used to set the amplitude of its analog output functions. These
adjustments are only required immediately prior to routine Standard Calibration of the
Model 9100 as detailed in subsequent sub-sections of this handbook.
CAUTION! Do not press the Chse — DAC softkey unless you are doing so as part of
an authorized recalibration of the Model 9100. Although the internal adjustment
operations which it initiates will not dramatically change the overall calibration of the
instrument, they will introduce a very small 'artificial' step into its apparent drift
performance. If your company maintains historical records on each calibrator's drift
performance between calibrations (for example, for the purposes of statistical process
control in a total quality management system) this artificial step would need to be
determined and suitably recorded in these records. There are no performance advantages
to be gained by performing the Characterise DAC operation other than when Standard
Calibration of the Model 9100's functions is also performed.
Special Calibration
BEWARE! The keys below trigger
major changes to calibration
or characterisation factors
Chse —
DAC
Содержание 9100 Series
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