©Isothermal Technology
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914 millisKanner manual Iss. 1.00
Connect the thermocouple to the millisKanner (channel 10 in the example below) and set
the milliK to read °C for that channel with internal RJC by changing the parameters in the
‘Settings’ screen:
Press the
Numeric
Numeric
Numeric
Numeric
(F2) key, clear the statistics and wait for 100 measurements to be
made (when the display shows “Mean of 100”). The mean value indicated by the milliK
should be compared with the known temperature. Any discrepancy may be the result of
errors in the RJC system or the thermocouple used. You might consider using an ice bath
for the “known” temperature, and this is a reasonable choice. However, the error on a
type J thermocouple, even at 20°C might be 5\V (or even higher), which corresponds to a
temperature error of approximately 0.2°C. An alternative approach would be to use room
temperature as the “known” temperature and to measure this with a calibrated PRT
connected to the milliK. This approach has the advantage that the difference between
room temperature and the reference junction in the millisKanner is likely to be very small
(< 3°C) so any error resulting from imperfections in the thermocouple will also be small.
You need to ensure that the thermocouple is at the same temperature as the PRT. You
can create an adequate isothermal environment using a stainless steel vacuum flask filled
with silicone oil (or another suitable liquid) and agitated with a small air pump of the type
