The positive lead of the type T thermocouple is made of copper. Therefore, that lead can be
connected directly to the input of the switching module (it does not have to be maintained at the
simulated reference temperature, in other words, immersed in an ice bath).
For the thermocouple-capable switching modules, you can also use a simulated reference junction as
shown, or you can connect the thermocouple wires directly to the screw terminals (internal reference
junction). Using a simulated reference junction may be inconvenient, but it will provide more accurate
temperature measurements (assuming the user enters a precise reference temperature).
Figure 54: Simulated reference junction switching module
Figure 55: Internal reference junction (40 channel switching module)
Thermocouple measurement from the front panel
If the Series 3700A is being controlled remotely, place the instrument in local control by pressing the
EXIT key.
To make a thermocouple measurement from the front panel:
1. Press the OPENALL key to open all switching channels.
2. Select the temperature measurement function by pressing the CONFIG key, and then pressing
the DMM key. FUNC flashes on, then off. Press the ENTER key or wheel. FUNCTION? is
displayed on the first line of the display and the second line displays available functions. Use the
left or right arrow keys of the knob to select TEMP.
3. Press the CONFIG key and then the DMM key. The "TEMP ATTR MENU" opens.
4. Set units of measurement degrees:
a. Turn the navigation wheel to scroll to the "UNITS" menu item (right most menu item) and press the
ENTER key.
b. Turn the navigation wheel to select the units (Celsius, Kelvin, or Fahrenheit) and press the ENTER key.
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