Fluke 2638A - Resistance Input Characteristics; Resistance Accuracy; Resistance Additional Errors; Rtd

Product Overview and Specifications
Measurement Specifications 1
1-19
Resistance Input Characteristics
Range Resolution
Resolution
Source Current
Fast
4½ Digits
Medium
5 ½ Digits
Slow
6 ½ Digits
100 Ω 100.0000 Ω 10 mΩ 1 mΩ 0.1 mΩ
1 mA / 4 V
1 kΩ 1.000000 kΩ 100 mΩ 10 mΩ 1 mΩ
1 mA / 4 V
10 kΩ 10.00000 kΩ 1 Ω 100 mΩ 10 mΩ
100 µA / 6 V
100 kΩ 100.0000 kΩ 10 Ω 1 Ω 100 mΩ
100 µA / 12 V
1 MΩ 1.000000 MΩ 100 Ω 10 Ω 1 Ω
10 µA / 12 V
10 MΩ 10.00000 MΩ 1 kΩ 100 Ω 10 Ω
1 µA / 12 V
100 MΩ 100.0000 MΩ 10 kΩ 1 kΩ 100 Ω
0.1 µA / 12 V
Resistance Accuracy
Accuracy is given as ± (% measurement + % of range). Basic accuracy specification is for 4-wire resistance. For 2-wire
resistance add 0.02 Ω internal resistance if using Channel 1 or 1.5 Ω if using channels x01 through x20, and add external
lead wire resistance.
Range
24 Hour
(23 ±1 °C)
90 Days
(23 ±5 °C)
1 Year
(23 ±5 °C)
T.C./ °C
Outside 18 °C
to 28 °C
100 Ω
0.003 % + 0.003 % 0.008 % + 0.004 % 0.01 % + 0.004 % 0.0006 % + 0.0005 %
1 kΩ
0.002 % + 0.0005 % 0.008 % + 0.001 % 0.01 % + 0.001 % 0.0006 % + 0.0001 %
10 kΩ
0.002 % + 0.0005 % 0.008 % + 0.001 % 0.01 % + 0.001 % 0.0006 % + 0.0001 %
100 kΩ
0.002 % + 0.0005 % 0.008 % + 0.001 % 0.01 % + 0.001 % 0.0006 % + 0.0001 %
1 MΩ
0.002 % + 0.001 % 0.008 % + 0.001 % 0.01 % + 0.001 % 0.001 % + 0.0002 %
10 MΩ
0.015 % + 0.001 % 0.02 % + 0.001 % 0.04 % + 0.001 % 0.003 % + 0.0004 %
100 MΩ
0.3 % + 0.01 % 0.8 % + 0.01 % 0.8 % + 0.01 % 0.05 % + 0.002 %
Note:
For conducted disturbances on mains input >1 V from 10 MHz to 40 MHz, add 0.6 % of range. For disturbances >3 V,
accuracy is unspecified.
Resistance Additional Errors
Digits NPLC Additional NPLC Noise Error
6 ½ 200 0 % of range
6 ½ 100 0 % of range
6 ½ 10 (Slow) 0 % of range
5 ½ 1 (Medium) 0.0008 % of range
4 ½ 0.2 (Fast)(only for 2-wire)
0.002 % of range + 12 mΩ
4 ½ 0.02 (only for 2-wire)
0.01 % of range + 17 mΩ
RTD
Temperature Range .............................................. -200 °C to 1200 °C (depending on the sensor)
Resistance Range ................................................. 0 Ω to 4 kΩ
Maximum Lead Resistance (4-wire Ω) ................ 2.5 % of range per lead for 400 Ω and 4 kΩ ranges
Sample Rate
Slow .................................................................... 10 PLC
Medium ............................................................... 2 PLC
Fast ..................................................................... 1 PLC
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