Welch
Allyn
Service Documentation
Part Number: 701627
Rev. G
Welch Allyn
701627 REV. G
Page 5 of 9
Calibration general: Checking the measuring accuracy with blackbody BB 3200 or 9600 PLUS
NOTE: It is recommended that the PRO-4000 have an Operational
Verification performed annually using the 9600 Plus Blackbody device.
•
Testing must only be done in Calibration mode (see page 6).
•
Use a new probe cover for calibration check (transparent protection cap).
•
Make sure that...
The ambient temperature is within the range 20...25 °C and is stable (no
drafts).
The appliances to be checked have had time to adapt to ambient temperature,
i.e. they have been placed unpacked in the room for at least half an hour prior
to the test.
After reaching the calibration mode (CAL) wait for 1 minute, insert the
appliance into the black body and wait for 3 seconds again to start the
measuring.
Wait about 1 minute before taking repeat measurements; during waiting, the
unit should be put down and not kept in hand.
A series of 3 measurements should be taken. All three measurements should
be with in the specific range.
•
Due to the design of this black body, its emission factor is only 0.99. Since
PRO/IRT 4000 models are calibrated on a blackbody with emission factor 1.00 in
the factory, a correction has to be made for the black body effective temperature.
This correction is -0,1°C for PRO/IRT 4000. Due to the heated probe tip, this
value is different compared to PRO/IRT 3000.
•
Appliances with readings outside the permissible range where the probe tip is
contaminated can be cleaned carefully with a cloth soaked with alcohol. After
cleaning wait at least 5 minutes before retest.
•
All measured values must be documented according to Welch Allyn Quality
procedures, stating the date of measurement, the serial number of the unit, the
measured values and the final decision. All data will be documented via SAP or
current data collection system.
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