Fluke 2625A, 2620A user manual Resistance and RTD

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.

Table 3-14. Thermocouple Ranges

Positive Lead

Type	Material
J	Iron
K	Chromel
E	Chromel
T	Copper
N	NISIL-
	NOCROSIL

Positive Lead Color

(ANSI)	(IEC)
WHITE	BLACK
YELLPW	GREEN
PURPLE	VIOLET
BLUE	BROWN

Negative Lead*

Material

Constantan

Alumel

Constantan

Constantan

Usable Range

(°C)

-210 to 760 -270 to 1372 -270 to 1000 -270 to 400 -270 to 1300

R

S

B

Platinum

Platinum

Platinum

(30% Rhodium)

BLACK

BLACK

GRAY

ORANGE

ORANGE

Platinum

(13% Rhodium)

Platinum

(10% Rhodium)

Platinum

(6% Rhodium)

0 to 1767

0 to 1767

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.

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