16H Manual Page 23
Revised: 11/2015
6 . 4 Checking Measuring Accuracy and
Magnification Accuracy
NOTE:
It must be stressed that the following is not part of the routine installation
and servicing procedure.
This inspection instrument is designed to project an image /- .10%
on profile and +/- .15% on surface illumination over the entire screen. Prior
to shipment the unit is calibrated and certified to be well within this
specification. If image accuracy of this magnitude is required on a daily
basis by you, the customer, then an established calibration interval must be
determined to meet your requirements.
Although the generally accepted calibration interval for this type of optical
inspection equipment is 1 year; factors such as frequency of use,
environment and duty, may affect the ability of any instrument to remain in
calibration. Calibration intervals must be adjusted up or down to compensate
for these factors. If only one lens shows a magnification or distortion error, it
is possible that adjustment is required to only the lens. A qualified person
should perform this adjustment.
If magnification is not uniform over the entire screen with more than one
lens, then mirror adjustment might be required. Consult a qualified/certified
individual or organization to perform this task. It is considered to be out of
the scope of the average user to maintain the proper calibration equipment
and training required to accurately calibrate an optical instrument. Dorsey
Metrology International Optical Metrology Division (OMD) provides this
service and training classes on calibration. Consult us for details.
6. MAINTENANCE
SECTION SIX