Thermocouple; Measure Thermocouples - Fluke 8588A Operator's Manual

Thermocouple

The Thermocouple Measure function provides 2-wire measurements that use the
V INPUT HI and LO terminals, converting dc voltage to temperature. Push
,  (More), then (Thermocouple) to use the Thermocouple
Measure function.
Thermocouple measurements require an external cold junction compensation.
The types of thermocouples supported are J, R, E, N, U, C, L, T, B, K, and S.
The Product uses the 100 mV dc range to make all thermocouple
measurements.
Thermocouple Menu
 (Type): Push this softkey to see the thermocouple choices. Make the
thermocouple type selection with the softkeys or use the navigational keys to
highlight the selection and the push . The Product has built-in tables that
convert the measured voltage to temperature based on the thermocouple type
chosen.
 (Resolution): The default resolution is 5 digits. The other choice is
6 Digits.
nd
 (2 reading): Select ON to show the actual dc voltage measured for the
2 nd reading.
 (Units): This softkey opens a menu to select the desired temperature
units, K, °C, or °F.
 (Measure setup): Provides access to a menu that allows you to change
the reading rate similar to DCV. Choices are Auto, Auto Fast, and Manual.

Measure Thermocouples

Thermocouples are widely used for measuring temperature over a wide range,
with rapid response and no self-heating. The Thermocouple function can be used
to calibrate actual thermocouples themselves or to calibrate the electronic
thermocouple output of thermocouple simulators like those found in the Fluke
5522A Multi-Product Calibrator. Both of these applications require the use of an
external reference junction, often referred to as the cold temperature junction.
A thermocouple in general, shown in Figure 20, consists of two wires of dissimilar
metals joined together at one end, called the measurement or "hot" junction. The
other end, where the wires are not joined, is connected to the Product V INPUT
HI and LO terminals using copper wire. A reference junction (also called the
"cold" junction) must be provided between the thermocouple metals and the
copper wires.
Reference Multimeter and 8 ½ Digit Multimeter
Thermocouple
71