Keithley 2002, Getting Started Manual

Page: 87 / 95

OHMS
ENHANCED ACCURACY
1
- 10PLC, Offset comp. on, DFILT 10
TEMPERATURE
COEFFICIENT
RELATIVE ACCURACY ± (ppm of r
± (ppm of r ppm of range) ppm of range) / °C
RANGE Transfer
5
24 Hours
3
90 Days
4
1 Year
4
2 Years
4
Outside T
CAL
±5°C
20
Ω
2.5 + 3 5 + 4.5 15 + 6 17 + 6 20 + 6 2.5 + 0.7
200
Ω
2.5 + 2 5 + 3 15 + 4 17 + 4 20 + 4 2.5 + 0.5
2 k
Ω
1.3 + 0.2 2.5 + 0.3 7 + 0.4 9 + 0.4 11 + 0.4 0.8 + 0.05
20 k
Ω
1.3 + 0.2 2.5 + 0.3 7 + 0.4 9 + 0.4 11 + 0.4 0.8 + 0.05
200 k
Ω
2.5 + 0.4 4.5 + 0.5 17 + 0.8 21 + 0.9 25 + 1 3 + 0.18
2 M
Ω
5 + 0.2 10 + 0.3 38 + 0.5 50 + 0.5 62 + 0.5 6 + 0.1
20 M
Ω
2
15 + 0.1 50 + 0.2 175 + 0.6 250 + 0.6 300 + 0.6 20 + 0.1
200 M
Ω
2
50 + 0.5 150 + 1 500 + 3 550 + 3 600 + 3 80 + 0.5
1 G
Ω
2
250 + 2.5 750 + 5 2000 + 15 2050 + 15 2100 + 15 400 + 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
CAL
±1°C, following 4-hour warm-up. T
CAL
is ambient temperature at calibration (23°C at the factory).
4. For T
CAL
±5°C, following 4-hour warm-up.
5. Specifications apply for 20-reading repeat digital filter, T
REF
± 0.5°C (T
REF
is the initial ambient temperature), and for measurements within
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
½
digits.
KEITHLEY FACTORY CALIBRATION UNCERTAINTY
RANGE ppm of reading
20
Ω
29.5
200
Ω
7.7
2 k
Ω
6.4
20 k
Ω
7.8
200 k
Ω
7.3
2 M
Ω
14.9
20 M
Ω
14.9
200 M
Ω
14.9
1 G
Ω
14.9
DC AMPS
DCI INPUT CHARACTERISTICS AND ACCURACY
TEMPERATURE
COEFFICIENT
1
MAXIMUM RELATIVE ACCURACY
1
±(ppm of r
FULL RESO- BURDEN ±(ppm of r ppm of range) ppm of range)/°C
RANGE SCALE LUTION VOLTAGE
4
24 Hours
2
90 Days
3
1 Year
3
2 Years
3
Outside T
CAL
±5°C
200 µA 210.00000 10 pA 0.25 V 50 + 6 275 + 25 350 + 25 500 + 25 50 + 5
2 mA 2.1000000 100 pA 0.3 V 50 + 5 275 + 20 350 + 20 500 + 20 50 + 5
20 mA 21.000000 1 nA 0.35 V 50 + 5 275 + 20 350 + 20 500 + 20 50 + 5
200 mA 210.00000 10 nA 0.35 V 75 + 5 300 + 20 375 + 20 525 + 20 50 + 5
2 A 2.1000000 100 nA 1.1 V 350 + 5 600 + 20 750 + 20 1000 + 20 50 + 5
1. Specifications are for 1 power line cycle, autozero on, 10-reading repeat digital filter.
2. For T
CAL
± 1°C, following 55-minute warm-up. T
CAL
is ambient temperature at calibration (23°C at the factory).
3. For T
CAL
± 5°C, following 55-minute warm-up.
4. Actual maximum burden voltage = (maximum burden voltage)
×
(I
MEASURED
/I
FULL SCALE
).
4-4 Specs and Accessories
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-
certainties are equal to the uncertainty of the respective calibration sources. The 20M
Ω
,
200M
Ω
, and 1G
Ω
range uncertainties are equal to the uncertainty of the 2M
Ω
calibration
source.