Kaman KD-2300 - Manual (Page 26)

KD-2300 Instruction Manual Part IV: Calibration
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Part IV: Calibration
Factory Calibration
All systems are factory calibrated; even so, we recommend that upon receipt
you check the calibration and recalibrate the system using one of the
procedures outlined on pages of this section. At the factory, systems are
calibrated with a typical output sensitivity as shown in Part 3: THE
EQUIPMENT, sensor specification table on page 14. We use flat aluminum
to optimize for nonmagnetic targets and 4130 cold rolled steel to optimize
for magnetic targets.
Calibration Interval
The importance of proper calibration cannot be overemphasized because it is
calibration that firmly establishes the accuracy of the measuring device.
Rather than accept the measurement from the device, it is usually best to
make at least a simple calibration check to be sure of the validity of the
measurements. The typical calibration cycle required for this device is
twelve months. However, the user’s application environment and
performance criteria could dictate that a more frequent calibration cycle be
used to ensure system performance in a particular application. The final
calibration interval is left to the discretion of the end user of the device.
Dimensional Standards
Calibration is a means to verify that system output relates to some known
physical displacement, a reference or dimensional standard with a known
degree of accuracy. When choosing a dimensional standard, keep in mind
that accuracy of the dimensional standard has a direct effect on accuracy of
calibration, and thus on the accuracy of any measurements you take.
A micrometer fixture is available from Kaman Precision Products for use as a
dimensional standard repeatable to within 100 micro inches (.0001"). The
micrometer has a non-rotating spindle with an attached target. It is suitable
for use with all Kaman sensors up to 2S (up to 8C with a larger target) and
may be rigidly mounted.
For some applications (i.e. larger sensors) nonconductive phenolic or
ceramic spacers can be used in calibration. Ceramic spacers are available
from Kaman in sizes ranging from .050” (1.27mm) to 1.000” (25.4mm).