Keithley 2002 Getting Started Manual page 87

4-4 Specs and Accessories
OHMS
ENHANCED ACCURACY
RANGE Transfer 5
Ω
20 2.5 + 3
Ω
200 2.5 + 2
2 k Ω
1.3 + 0.2
20 k Ω
1.3 + 0.2
200 k Ω
2.5 + 0.4
2 M Ω
5 + 0.2
20 M Ω
2
15 + 0.1
200 M Ω
2
50 + 0.5
1 G Ω
2
250 + 2.5
1. Specifications are for 10 power line cycles, 10-reading repeat digital filter, synchronous autozero, autorange off, 4-wire mode, offset com-
pensation on (for 20 Ω to 20k Ω ranges), except as noted.
2. For 2-wire mode.
3. For T ±1°C, following 4-hour warm-up. T
CAL
4. For T ±5°C, following 4-hour warm-up.
CAL
5. Specifications apply for 20-reading repeat digital filter, T
10% of the initial measurement value and within 10 minutes of the initial measurement time.
RESISTANCE UNCERTAINTY = ± [ (ppm of reading) × (measured value) + (ppm of range) × (range used) ] / 1,000,000.
% ACCURACY = (ppm accuracy) / 10,000.
1PPM OF RANGE = 20 counts for ranges up to 200M Ω and 10 counts on 1G Ω range at 7
KEITHLEY FACTORY CALIBRATION UNCERTAINTY
RANGE ppm of reading
Ω
20
Ω
200
2 k Ω
20 k Ω
200 k Ω
2 M Ω
20 M Ω
200 M Ω
1 G Ω
DC AMPS
DCI INPUT CHARACTERISTICS AND ACCURACY
FULL
RANGE SCALE
200 µA 210.00000
2 mA 2.1000000
20 mA 21.000000
200 mA 210.00000
2 A 2.1000000
1. Specifications are for 1 power line cycle, autozero on, 10-reading repeat digital filter.
2. For T ± 1°C, following 55-minute warm-up. T
CAL
3. For T ± 5°C, following 55-minute warm-up.
CAL
4. Actual maximum burden voltage = (maximum burden voltage) × (I
- 10PLC, Offset comp. on, DFILT 10
1
RELATIVE ACCURACY
± (ppm of reading + ppm of range)
24 Hours 3 90 Days
5 + 4.5 15 + 6
5 + 3 15 + 4
2.5 + 0.3 7 + 0.4
2.5 + 0.3 7 + 0.4
4.5 + 0.5 17 + 0.8
10 + 0.3 38 + 0.5
50 + 0.2 175 + 0.6
150 + 1 500 + 3
750 + 5 2000 + 15
is ambient temperature at calibration (23°C at the factory).
CAL
REF
29.5
Factory calibration uncertainty represents traceability to NIST. This uncertainty is added to
relative accuracy specifications to obtain absolute accuracies. The 20 Ω - 2M Ω range un-
7.7
certainties are equal to the uncertainty of the respective calibration sources. The 20M Ω ,
6.4
200M Ω , and 1G Ω range uncertainties are equal to the uncertainty of the 2M Ω calibration
7.8
7.3
source.
14.9
14.9
14.9
14.9
MAXIMUM
RESO- BURDEN
4
LUTION VOLTAGE 24 Hours
10 pA 0.25 V 50 + 6
100 pA 0.3 V 50 + 5
1 nA 0.35 V 50 + 5
10 nA 0.35 V 75 + 5
100 nA 1.1 V 350 + 5
is ambient temperature at calibration (23°C at the factory).
CAL
4 1 Year 4 2 Years
17 + 6 20 + 6
17 + 4 20 + 4
9 + 0.4 11 + 0.4
9 + 0.4 11 + 0.4
21 + 0.9 25 + 1
50 + 0.5 62 + 0.5
250 + 0.6 300 + 0.6
550 + 3 600 + 3
2050 + 15 2100 + 15
± 0.5°C (T is the initial ambient temperature), and for measurements within
REF
digits.
RELATIVE ACCURACY
±(ppm of reading + ppm of range)
2 3
90 Days 1 Year
275 + 25 350 + 25
275 + 20 350 + 20
275 + 20 350 + 20
300 + 20 375 + 20
600 + 20 750 + 20
/I
MEASURED FULL SCALE
TEMPERATURE
COEFFICIENT
± (ppm of reading +
ppm of range) / °C
4 Outside T ±5°C
CAL
2.5 + 0.7
2.5 + 0.5
0.8 + 0.05
0.8 + 0.05
3 + 0.18
6 + 0.1
20 + 0.1
80 + 0.5
400 + 2.5
TEMPERATURE
COEFFICIENT
1
±(ppm of reading +
ppm of range)/°C
3 3
2 Years Outside T
500 + 25 50 + 5
500 + 20 50 + 5
500 + 20 50 + 5
525 + 20 50 + 5
1000 + 20 50 + 5
).
1
±5°C
CAL