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(5) Key 3:
1) In the measurement state, press “Key 3” briefly to change the display
resolution.
2) In the measurement state, press “Key 3” and hold it for 2 seconds to select
the compensation modes for thermocouple reference ends.
a) INT is the internal compensation mode: see 3.(2) above for its wiring.
b) EXT is the external compensation mode: see 3.(3) above for its wiring.
c) MAN is manual compensation mode for the reference ends’ temperatures:
see 3.(3) above for its wiring, and the menu parameter mAn.tMP should be
set to the temperature of constant temperature oven.
3) In the calibration state, press “Key 3” to skip the current calibration point
(as well as other relevant calibration point) and enter the next calibration point.
4) In the menu parameter setting state, “Key 3” is the decrease key.
(6) Key 4:
1) In the measurement state, press “Key 4” briefly to realized the “HOLD”
function, which means that the current measurement values and all
mathematical measurement results remain unchanged until “Key 4” is pressed
briefly again to deactivate the “hold” state. When exiting the menu, “HOLD” is
canceled.
2) In the measurement state:
a) When the menu parameter CAL.Cod is equal to 808, pressing “Key 4” for
long can be used for user calibration,and pressing “Key 2 + Key 4” for long
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