User`s manual

Page 26 · 4200-DR Series LaserSource User’s Manual
Field Calibration (User Cal)
The 4200-DR is typically calibrated annually, and calibration can be done one of
two ways: the instrument can be returned to the factory for a full recalibration, or
the User Cal menu can be used for simpler slope/offset calibration.
Factory calibration has the benefit of a full multi-point calibration and verification
of instrument performance against NIST-traceable instrumentation, using
equipment and test loads designed specifically for the application. However,
field (or user) calibration is possible, and often desirable, as it allows the user to
meet certification or calibration requirements not available through a factory
calibration.
This field or user calibration is accessible through the User Cal menu, or via the
LASER:USERCAL commands over the computer interface.
For local calibration, the User Cal menu is located under the Advanced menu,
and can be found by pressing the MENU button to enter the main menu,
scrolled to the last entry, which will be the Advanced menu, and then scrolling
to the last entry of that menu, which will be the User Cal menu. From there, you
can view the various calibration entries, but editing can only be done by
changing Edit Cal to Yes. Once enabled, the calibration entries can be adjusted
just like any other menu setting.
For each set point or measurement, there is a corresponding slope and offset
calibration. On the 4200-DR series, the following user calibrations are available:
CAUTION
Because user calibration directly affects the
performance of the instrument, it must be performed by
a qualified technician with sufficiently accurate meters
and test loads to properly measure the actual
performance of the instrument. Failure to do so could
significantly degrade the performance of the instrument
or damage your device.