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Evaluate the overall accuracy of thermocouples measu. with 34901A in 34972A

Question asked by neckag on Apr 25, 2013
Latest reply on Apr 25, 2013 by neckag
Hello everybody,
We use in our laboratory a multiplexer 34901A in a 34972A for data acquisition (thermocouples K). I would like to evaluate the overall accuracy of the measurements.
The supplier specifies an accuracy of 1.5 °C (DIN EN 60584 cl.1).
In the agilent documentation (enclose page), I find that the accuracy specifications (including measurement error, switching, transducer conversion error) is 1°C for 24 Hour /23°C+/-1°C and 1.5°C for 1 Year 23°C+/-5°C for a thermocouple K.
We use 6 1/2 digits.
Can I say that the accuracy of our temperature measurement is delta = 1.5°C+1.5°C = 3°C?

This is so big! Could I improve it without changing the thermocouples?

What is the use of the accuracy 24 hour 23°C+/-1°C? I don't know why three different values are provided. (24h; 90 days; 1 year)

Laboratory conditions: constant temperature of about 22°C+/-2°C all over the year.  

Thank you in advance.