Fluke 1552A EX - Manual (Page 13)

Stik Thermometer
Calibration
5
Nominal Probe Resistance at 0 ° C .......................................... 100 Ω
Probe Hysteresis....................................................................... ± 0.01 ° C
Power ......................................................................................... 3 AAA alkaline batteries
(Must use only approved batteries. See Table 2)
Battery Life ................................................................................ Approximately 300 hours without back light
Battery Save (auto-off) Range ................................................. Selectable from 1 to 30 minutes or can be disabled
Size (readout only).................................................................... Approximately 4 in. x 2 in. x 1 in.
Probe Size.................................................................................. 1551A-9: 4.8 mm x 229 mm (3/16 in. x 9 in.)
1551A-12: 6.35 mm x 305 mm (1/4 in. x 12 in.)
1551A-20: 6.35 mm x 508 mm (1/4 in. x 20 in.)
1552A: 6.35 mm x 305 mm (1/4 in. x 12 in.)
Weight ........................................................................................ 6.9 oz
Calibration
XW Warning
To prevent possible electrical shock, fire, or personal injury, the
RS-232 interface must not be used in hazardous areas.
This procedure is to be considered a general guideline. Each laboratory should develop
their own specific procedure based on their equipment and requirements. The procedure
should be accompanied by an uncertainty analysis also based on the laboratory’s
equipment and environment.
Calibration should only be performed by qualified personnel. The technician should be
familiar with the 1551A Ex/1552A Ex Users Manual.
The calibration must be performed in the following ambient conditions:
Temperature: 23
° C ± 2 ° C
Relative humidity: 70 % maximum
Overview
The calibration consists of inserting the Product probe into a temperature bath having a
known temperature and observing the difference between the temperature measured by
the Product and the known temperature of the bath. The temperature of the bath is
determined using an accurate reference thermometer. An equilibration block helps to
ensure that the temperatures of the reference thermometer and 1551A Ex/1552A Ex
Thermometer are uniform and stable.
If necessary, the calibration parameters in the Product can be adjusted to improve its
accuracy. Adjustments are made by sending the appropriate command to the Product
through an RS-232 cable connected to a computer. For completeness of documentation,
the calibration parameters should be recorded before and after adjustment.
In summary, the main calibration steps are as follows:
• Record as-found calibration parameter values
• Evaluate as-found measurement errors
• Adjust the calibration parameters
• Evaluate as-left measurement errors
• Record as-left calibration parameters values