Delta RetroSign GRX-1, User Manual

Page: 66 / 80

RetroSign GRX User Manual / December 2017
66
DELTA
In case of dust on the surface, clean the calibration target gently by using a soft cloth - if necessary
use a mild household detergent. Wipe carefully with dry linen cloth afterwards.
To ensure reliable measurements, it is recommended that the calibration target is periodically
recalibrated or changed to a traceable standard. DELTA suggests this period to be every 2 years. The
calibration target comes with a DANAK accredited calibration certificate. DELTA offers calibration
traceable to PTB (Physikalisch-Technishe Bundesanstalt) and NIST (National Institute of Standards
and Technology). For further information, contact your appointed dealer or DELTA, Denmark.
The RetroSign GRX may be calibrated with any DELTA approved calibration target following the
calibration procedure outlined in this manual. The DANAK accredited calibration certificate delivered
with a calibration target will have random numbering
– the serial number of the certificate does not
correspond to the serial number of the GRX instrument.
Calibration
The RetroSign GRX is factory calibrated but a reference calibration should always be carried out
before starting a series of inspections, or minimum once a day when using the instrument.
The calibration process automatically compensates for instrument offsets etc.