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2645A Specifications

A

A-21

Tables A-30 to A-32 provide 2645A specifications for the 4-wire resistance
measurement function. The 4-wire measurements use 2 input channels a decade
apart, e.g., channels 4 and 14.

Temperature Coefficient

Add 1/10th the 90 day specification per 

º

C

above 28

º

C or below 18

º

C.

Accuracy at -20

ºC

Multiply the -10

°

C to + 60

°

C accuracy

specification by 2. After 1 hour warm-up. For
accuracy between -10

°

C and -20

°

C, interpolate

linearly.

300

Ω

10 m

Ω

30 m

Ω

1 mA

300 mV

3.5V

3 k

Ω

100 m

Ω

300 m

Ω

100 µA

300 mV

3.5V

30 k

Ω

1

Ω

3

Ω

10 µA

300 mV

3.5V

300 k

Ω

10

Ω

30

Ω

10 µA

3.0V

3.5V

3 M

Ω

100

Ω

300

Ω

1 µA

3.0V

3.5V

σ

±

300

Ω

.02%+60 m

Ω

.02%+.1

Ω

.02%+.1

Ω

.02%+.2

Ω

.084%+.25

Ω

.084%+.42

Ω

3 k

Ω

.02%+.6

Ω

.02%+2

Ω

.02%+1

Ω

.02%+3

Ω

.084%+2.5

Ω

.084%+8.4

Ω

30 k

Ω

.02%+6

Ω

.2%+200

Ω

.02%+10

Ω

.2%+300

Ω

.084%+25

Ω

.84%+840

Ω

300 k

Ω

.5%+80

Ω

1%+2 k

Ω

.5%+150

Ω

1%+3 k

Ω

2.1%+336

Ω

4.2%+8.4 k

Ω

3 M

Ω

1.3%+1 k

Ω

2%+120 k

Ω

1.3%+2 k

Ω

2%+200 k

Ω

5.46%+4.2 k

Ω

8.4%+200 k

Ω