ST2515 Operation Manual
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0 ADJ (ON/OFF): Touch this key to select ON or OFF. ON is to turn on the short correction
function while OFF is to turn off.
OVC: Touch this key to select ON or OFF. ON is to turn on voltage compensation while OFF is
to turn off.
Adjust: Touch this key to select the correction as MANUAL or AUTO. If you select AUTO, the
instrument will make corrections in every 30 minutes and it will cost 55ms. If you select
MANUAL, the instrument will make correction according to HANDLER command.
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NOTE: When two different materials contact, a thermoelectromotive force will be generated on
the contact surface of them. It will vary with the environment temperature. The higher the
environment temperature is, the larger the thermoelectromotive force will be. The principle of
OVC is to apply an inverse current through tested terminals and the formula is
,
where Rp is a positive value, Rn is a negative value.
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3.6
<TC/∆t SETUP>
Touch the main menu. And then touch the soft key TC/∆t SETUP to enter into the TC/∆t setup
page shown as figure 3-6.
Figure 3-6 TC/∆t setup
3.6.1
Computational Formula of Pt and Analog Input
Temperature correction function: By this function, the resistance tested under the current
environment temperature will be converted to a resistance value under the user-set environment
temperature. For instance, a resistor is tested as 100Ω under 20°C. If user sets the temperature as
