Section 5: Basic Digital Multimeter (DMM) Operation
Series 3700 System Switch/Multimeter User's Manual
5-58
3700S-900-01 Rev. C / July 2008
Thermocouple connections
Connections for thermocouples are shown below. Thermocouples are color
coded to identify the positive (+) and negative (-) leads (see the table). Note that
the negative (-) lead for U.S. type T/Cs is red.
T/C type
Positive
(+)
Negative (-)
T/C type
Positive (+)
Negative (-)
J
White
Red
E
U.S.
Purple
Red
Yellow
Blue
British
Brown
Blue
Red
Blue
DIN
Red
Black
Red
White
Japanese
Red
White
Yellow
Black
French
Yellow
Blue
K
Yellow
Red
R
U.S.
Black
Red
Brown
Blue
British
White
Blue
Red
Green
DIN
Red
White
Red
White
Japanese
Red
White
Yellow
Purple
French
Yellow
Green
N
Orange
Red
S
U.S.
Black
Red
--
--
British
White
Blue
--
--
DIN
Red
White
--
--
Japanese
Red
White
--
--
French
Yellow
Green
T
Blue
Red
B
U.S.
Gray
Red
White
Blue
British
--
--
Red
Brown
DIN
Red
Gray
Red
White
Japanese
Red
Gray
Yellow
Blue
French
--
--
When using the Series 3700 analog backplane connector, use a simulated
reference junction for thermocouple temperature measurements. An ice bath, as
shown below, serves as an excellent cold junction because it is relatively easy to
hold the temperature to 0°C. Notice that copper wires are used to connect the
thermocouple to the Series 3700 input.