Fluke 2620A User Manual

Users Manual

3-20

For all channels (0 through 20), 2-terminal resistance or RTD measurements are allowed.
Four-terminal measurements can be made on channels 1 through 10 only. Refer to
Figure 3-3.

For each channel configured for 4-terminal measurements (channels 1-10 only), a second
channel (numbered 10 higher than the first) becomes unavailable for any other type of
measurement. For example, using channel 7 to make 4-terminal resistance measurements
requires the use of input terminals for both channels 7 and 17. Channel 17 cannot be
used to take any other measurements as long as channel 7 remains configured for 4-
terminal measurements.

°

J

Iron

WHITE

BLACK

Constantan

-210 to 760

K

Chromel

YELLPW

GREEN

Alumel

-270 to 1372

E

Chromel

PURPLE

VIOLET

Constantan

-270 to 1000

T

Copper

BLUE

BROWN

Constantan

-270 to 400

N

NISIL-
NOCROSIL

-270 to 1300

R

Platinum

BLACK

ORANGE

Platinum
(13% Rhodium)

0 to 1767

S

Platinum

BLACK

ORANGE

Platinum
(10% Rhodium)

0 to 1767

B

Platinum
(30% Rhodium)

GRAY

Platinum
(6% Rhodium)

0 to 1820

C**

Tungsten

WHITE

Tungsten
(26% Rhenium)

0 to 2316

* ANSI negative lead always RED, IEC negative lead always WHITE
** Hoskins Engineering Co.

Use the following procedure for resistance or RTD measurement connections to the
Input Module:

1.

 

Remove the Input Module from the rear panel.

2.

 

Loosen the two large screws on top and open the module.

3.

 

Connect wires to H (high) and L (low) terminals for each channel (channel 7 for 2-
terminal configuration or channels 7 and 17 for 4-terminal configuration, in this
example.)

4.

 

Thread these wires through the strain-relief pins and out the back of the module.
Refer to Figure 3-2.

5.

 

Close the module cover, secure the screws, and put the module back in the
instrument.