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Instrumentation Laboratory Exercise 15
Laboratory Exercise 2
Diode junction temperature measurement
Apparatus
• One 1 kΩ resistor
• One signal diode (silicon)
• Test/prototyping board
• Agilent U2351A, U2352A, U2353A, or U2354A USB multifunction
data acquisition device
• Agilent E3620A 50 W dual output power supply or Agilent
U8001A/U8002A single output DC power supply
• Thermometer (optional)
2.1 Introduction and objectives
The purpose of this laboratory exercise is to learn how to calibrate
and use a diode junction temperature sensor. A forward biased diode
should be assembled with a 1 kΩ resistor to +5 V. The diode voltage
(approximately 0.7 V) should be measured by the DAQ and displayed.
The voltage should be recorded when the diode is placed in contact
with container containing ice water (0 °C reference), as the 0 °C
value.
Next, the room temperature voltage should be recorded. Room
temperature should be measured with a thermometer, and the diodes
offset and span should be calibrated at 0 °C and at the measured
room temperature. The calculated diode temperature should then be
displayed on the screen in the form of a linear chart (like a
thermometer). Your body temperature should then be measured to
confirm that they are indeed alive.