(4) Calibration for Errors of the Interior Reference Ends: Place the instrument
in the environment with stable temperature, set the type to the thermocouple with
larger thermoelectric potentials (K thermocouple or E thermocouple is favorable
and B thermocouple, S thermocouple or R thermocouple is not suitable), set
OFF.SEt = 0, CAL.Cod=808, set the compensation mode to the INT interior mode,
connect the (class-Ⅰ) thermocouple. (The thermocouple need same as “tyPE”
setting) to the TC input end, place the measuring ends of thermocouple wires in
the constant temperature oven (or ice bath) for 20 minutes, press “Key 2 + Key 4”
at the same time and hold them for 2 seconds when the instrument’s indicating
value vary less than 0.1℃/5min, when “rEF=?” is shown input the accurate
temperature value (plus the correction value of the used thermocouple wire) of the
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