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