Series 3700A System Switch/Multimeter Reference Manual Section 4: Basic DMM operation
3700AS-901-01 Rev. D/June 2018 4-27
5. Set THERMO device attributes:
â–ª Turn the navigation wheel to scroll to the "THERMO" menu item and press the ENTER key.
â–ª Turn the navigation wheel to scroll to the "THERMOCOUPLE" type and press the ENTER
key.
â–ª Turn the navigation wheel to select type and press the ENTER key.
6. Press the EXIT key twice to leave the "TEMP ATTR MENU."
7. Connect the temperature transducers to be measured.
8. If using a switching module, perform the following steps to close the channel.
a. Use the navigation wheel to select the channel number.
b. Press the CLOSE key.
9. Press the TRIG key and observe the displayed reading.
10. To measure other channels, repeat steps 7 and 8.
11. When finished, press the OPENALL key to open all channels.
Thermocouple measurement through the remote interface
To take thermocouple measurements through the remote interface:
dmm.func = "temperature"
dmm.transducer = dmm.TEMP_THERMOCOUPLE
dmm.thermocouple = dmm.THERMOCOUPLE_J
Sets the thermocouple type to J.
Thermistors
The temperature measurement range for thermistors is –80 °C to 150 °C (0.01 °C resolution).
Thermistor types that are supported include the 2.2 kΩ, 5 kΩ, and 10 kΩ types.
The thermistor is a temperature-sensitive resistor. Its resistance changes non-linearly with changes in
temperature. Most thermistors have a negative temperature coefficient: As temperature increases,
the resistance decreases. The Series 3700A measures the resistance of the thermistor and
calculates the temperature reading.
Of all the temperature transducers, the thermistor is the most sensitive. It can detect minute changes
in temperature. It is a good choice when measuring slight changes in temperature. The downside for
this increased sensitivity is the loss of linearity. Because they are especially non-linear at high
temperatures, it is best to use them for measurements below 100 °C.
Curve fitting constants are used in the equation to calculate thermistor temperature. The thermistor
manufacturer’s specified curve fitting may not be exactly the same as the ones used by the Series
3700A.
For information about temperature equations, see Temperature equations (on page 4-33).
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