Resistance And Rtd; Thermocouple Ranges - Fluke 2620A User Manual

2620A, 2625A
Users Manual

Resistance and RTD

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.
Positive Lead
Type
J
K
E
T
N
R
S
B
C**
* 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-
4. Thread these wires through the strain-relief pins and out the back of the module.
5. Close the module cover, secure the screws, and put the module back in the
3-20
Table 3-14. Thermocouple Ranges
Material
Iron WHITE
Chromel YELLPW
Chromel PURPLE
Copper BLUE
NISIL-
NOCROSIL
Platinum BLACK
Platinum BLACK
Platinum GRAY
(30% Rhodium)
Tungsten WHITE
terminal configuration or channels 7 and 17 for 4-terminal configuration, in this
example.)
Refer to Figure 3-2.
instrument.
Positive Lead Color
(ANSI) (IEC)
BLACK
GREEN
VIOLET
BROWN
ORANGE
ORANGE
Negative Lead* Usable Range
Material
Constantan -210 to 760
Alumel -270 to 1372
Constantan -270 to 1000
Constantan -270 to 400
-270 to 1300
Platinum 0 to 1767
(13% Rhodium)
Platinum 0 to 1767
(10% Rhodium)
Platinum 0 to 1820
(6% Rhodium)
Tungsten 0 to 2316
(26% Rhenium)
( C)