©
National Instruments Corporation
61
NI 4070/4072 Calibration Procedure
2-Wire Resistance
Note
Tolerances are provided for 2-wire resistance instead of absolute limits because the
limits depend on the actual resistance value output by your calibrator.
DC Current
0
Ω
10 k
Ω
0 + 3
0 + 2
0
Ω
1 k
Ω
0 + 3
0 + 2
0
Ω
100
Ω
0 + 10
0 + 10
Table 20.
NI 4070/4072 2-Wire Resistance Verification Tolerances
Calibrator
Resistance
Range
2-Year Tolerance
±
(ppm of Calibrator
Resi ppm of Range)
24-Hour Tolerance
±
(ppm of Calibrator
Resi ppm of Range)
0
Ω
10 k
Ω
0 + 23
0 + 22
0
Ω
1 k
Ω
0 + 203
0 + 202
0
Ω
100
Ω
0 + 2010
0 + 2010
100 M
Ω
100 M
Ω
6000 + 40
900 + 20
10 M
Ω
10 M
Ω
400 + 10
100 + 2
1 M
Ω
1 M
Ω
90 + 10
20 + 2
100 k
Ω
100 k
Ω
80 + 8
15 + 4
10 k
Ω
10 k
Ω
80 + 23
12 + 22
1 k
Ω
1 k
Ω
80 + 203
12 + 202
100
Ω
100
Ω
80 + 2010
15 + 2010
Table 21.
NI 4070/4072 DC Current Verification Limits
Calibrator Amplitude
Range
2-Year Limits
Lower
Upper
0 A
20 mA
–3
μ
A
3
μ
A
0 A
200 mA
–4
μ
A
4
μ
A
0 A
1 A
–50
μ
A
50
μ
A
Table 19.
NI 4070/4072
4-Wire Resistance Verification Tolerances (Continued)
Calibrator
Resistance
Range
2-Year Tolerance
±
(ppm of Calibrator Resi ppm
of Range)
24-Hour Tolerance
±
(ppm of Calibrator Resi ppm
of Range)
