Linear Technology DC2296 Demo Manual page 14

DEMO MANUAL DC2296
HarDware setup
To see the effects of parasitic thermocouples on non-rotated
measurement modes, first measure the on-board 0°C
PT100 simulator in a non-rotated configuration and see
the measurement error as the thermocouple's temperature
changes. To see the benefit of the rotated measurement
mode, switch from the no rotation/sharing to the rotation/
sharing configuration and see the errors introduced by the
parasitic thermocouple minimized.
In addition to the fixed value RTD simulator, there is also
a variable resistor RTD simulator. This circuit can be used
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to demonstrate the range of the various LTC2983 RTD
sensor modes as well as demonstrate the fault detection
capabilities of the LTC2983.
If the user wishes to connect an external RTD to the sensor
board, a 4-position terminal block is provided. The user
may connect any of the LTC2983 supported RTDs as well
as custom RTDs to the DC2209 demo board through this
interface. The interface may be configured for 3 or 4 wire
sensors. To demonstrate the accuracy of the LTC2983,
the user may also connect an RTD calibrator or precision
resistors to this interface.
Figure 13. DC2213 Dedicated rTD Board Schematic
dc2296fa