Fluke NetDAQ 2645A - Manual (Page 222)

2640A/2645A NetDAQ
Users Manual
A-12
2640A 4-Wire Resistance Measurement Specifications A-15.
Tables A-15 to A-17 provide 2640A 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-15. 2640A 4-Wire Resistance Temperature Coefficient
Specification Characteristic
Temperature Coefficient Add 1/10th the 90 day specification per º C
above 28 º C or below 18 º C.
Accuracy at -20
°
C Multiply the -10
°
C to + 60
°
C accuracy
specification by 2. After 1 hour warmup. For
accuracy between -10
°
C and -20
°
C, interpolate
linearly .
Table A-16. 2640A 4-Wire Resistance Range and Resolution Specifications
Resolution
Current Full Scale Maximum voltage
Range
Slow Fast
Applied Voltage applied by instrument
300
Ω
1 m
Ω
3 m
Ω
1 mA 300 mV 3.5V
3 k
Ω
10 m
Ω
30 m
Ω
100 µA 300 mV 3.5V
30 k
Ω
100 m
Ω
300 m
Ω
10 µA 300 mV 3.5V
300 k
Ω
1
Ω
3
Ω
10 µA 3.0V 3.5V
3 M
Ω
10
Ω
30
Ω
1 µA 3.0V 3.5V
Table A-17. 2640A 4-Wire Resistance Accuracy Specifications
Accuracy, 3
σ
+ (% input + V)
18 º C to 28 º C -10 º C to 60 º C
Range
90 Day 1 Year 1 Year
Slow Fast Slow Fast Slow Fast
300
Ω
.015%+20 m
Ω
.02%+80 m
Ω
.02%+50 m
Ω
.02%+120 m
Ω
.084%+126 m
Ω
.084%+336 m
Ω
3k
Ω
.02%+.3
Ω
.02%+.8
Ω
.02%+.5
Ω
.02%+1.2
Ω
.084%+1.26
Ω
.084%+3.36
Ω
30 k Ω .03%+3 Ω .04%+10 Ω .03%+5 Ω .04%+15 Ω .126%+12.6 Ω .168%+42 Ω
300 k
Ω
.1%+40
Ω
. 2%+100
Ω
.1%+60
Ω
.2%+150
Ω
.42%+168
Ω
.84%+420
Ω
3 M
Ω
* .25%+800
Ω
* .5%+10k
Ω
* .25%+1 k
Ω
* .5%+1.5k
Ω
* 1.05%+3.36
Ω
2.1%+4.2 k
Ω
*
* The 3 M Ω range is susceptible to the absorption of humidity under extreme conditions. If the instrument is
operated normally within its specified temperature-humidity range, the 3 M
Ω
range meets its accuracy
specifications. However, if the instrument is “soaked” at 50
°
C, 90% RH the 3M
Ω
range may require 1 hour
of “dry-out” time at 25
°
C, <40% RH for each hour of “soak” time in order to achieve its specified accuracy.