A-30. 2645A 4-Wire Resistance Temperature Coefficient; A-31. 2645A 4-Wire Resistance Range And Resolution Specifications; A-32. 2645A 4-Wire Resistance Accuracy Specifications - Fluke NetDAQ 2640A User Manual

2645A 4-Wire Resistance Measurement Specifications
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.
Table A-30. 2645A 4-Wire Resistance Temperature Coefficient
Specification
Temperature Coefficient
Accuracy at -20ºC
Table A-31. 2645A 4-Wire Resistance Range and Resolution Specifications
Range
Slow
300 10 m
3 k 100 m
30 k 1
300 k 10
3 M 100
Table A-32. 2645A 4-Wire Resistance Accuracy Specifications
Range
90 Day
Slow
300 .02%+60 m
3 k .02%+.6
30 k .02%+6
300 k .5%+80
3 M 1.3%+1 k
Resolution
Fast
30 m
300 m
3
30
300
Accuracy, 3
18ºC to 28ºC
Fast Slow
.02%+.1 .02%+.1
.02%+2 .02%+1
.2%+200 .02%+10
1%+2 k .5%+150
2%+120 k 1.3%+2 k
Characteristic
Add 1/10th the 90 day specification per ºC
above 28ºC or below 18ºC.
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.
Current Full Scale
Applied Voltage
1 mA 300 mV
100 µA 300 mV
10 µA 300 mV
10 µA 3.0V
1 µA 3.0V
(% input + V)
1 Year
Fast Slow
.02%+.2 .084%+.25
.02%+3 .084%+2.5
.2%+300 .084%+25
1%+3 k 2.1%+336
2%+200 k 5.46%+4.2 k
Specifications
2645A Specifications
A-24.
Maximum
Voltage
Applied
3.5V
3.5V
3.5V
3.5V
3.5V
-10ºC to 60ºC
1 Year
Fast
.084%+.42
.084%+8.4
.84%+840
4.2%+8.4 k
8.4%+200 k
A
A-21