© Isothermal Technology
Page 43 of 102
923 milliK manual - issue: 1.10
Use the
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keys to select each parameter in turn and press the
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key to open a soft numeric
keypad and enter the value from the calibration certificate. If no coefficient is supplied (not
all coefficients are required), leave the value set to zero. If your thermometer is supplied with
a calibration over the range -38.8344°C (mercury triple point) to 29.7646°C (gallium melting
point), it should be provided with two coefficients (a and b). To enter these, use the
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keys
to select the
t < 0.01°C
button and use the
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→
→
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→
to change this to
-38.8 < t < 29.7°C
.
The a and b coefficient can then be entered below the button.
3.9.5 Using a Thermocouple with Calibration Coefficients / Data Pairs
The EMF-temperature characteristics of thermocouples are non-linear and the milliK uses
standard algorithms (from IEC584, apart from gold-platinum and type L) to convert the
measured EMF to a temperature. Thermocouples can be calibrated individually to achieve
better measurement uncertainty. The calibration is presented as a deviation function
polynomial or as data pairs. The milliK supports a third-order polynomial correction and data
pairs (linear interpolation between the data pairs).
In the ‘Thermometer’ Window use the
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keys to select ‘Conversion’ and then use the
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keys to select the required thermocouple type. Now use the
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keys to select ‘Coefficients’
and press the
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key to open the ‘Thermometer Coefficients’ Window:
