Fluke 1595A - Manual (Page 17)

7
Introduction and Specifications
Specifications
Table 3 Resistor Stability Specifications
Resistor (Rs) Accuracy (ppm of reading),
95 % confidence level
24 hours
30 days
1 W 5 ppm 10 ppm
10 W 0.5 ppm 2 ppm
25 W 0.25 ppm 1 ppm
100 W 0.2 ppm 1 ppm
10 kW 0.25 ppm 1 ppm
2.2.2.3 Absolute Resistance Accuracy
Absolute resistance accuracy is the ability of the instrument to measure absolute resistance, Rx, using the
internal reference resistors. The following specifications apply using the given reference resistor, Rs, and
excitation current.
The 1-year specifications include calibration uncertainty, reference resistor drift, ambient temperature sensitiv-
ity, resistance ratio uncertainty, and measurement noise using 1-minute average and a 2-second sample period
(n = 30).
Performance verification is guaranteed for 99% confidence level, 1-year specifications within the specified
operating temperature range of 15°C to 30°C, maintaining a calibration interval of 6 months for the first year
and 1 year thereafter.
Table 4 Absolute Resistance Accuracy Specifications
Resistance range (Rs, current) Accuracy (ppm of reading)
95% confidence level, 1-year
0 W to 1.2 W (1 W, 10 mA) Greater of 40 ppm or 0.000012 W
0 W to 12 W (10 W, 3 mA) Greater of 10 ppm or 0.000024 W
0 W to 120 W (25 W, 1 mA) Greater of 5 ppm or 0.000024 W
0 W to 400 W (100 W, 1 mA) Greater of 4 ppm or 0.00008 W
0 W to 10 kW (10 kW, 10 mA) Greater of 5 ppm or 0.000012 k W
10 k W to 40 kW (10 kW, 10 mA) 8 ppm
40 k W to 100 kW (10 kW, 2 mA) 20 ppm
100 k W to 500 kW (10 kW, 1 mA) 80 ppm
99% confidence level, 1-year
0 W to 1.2 W (1 W, 10 mA) Greater of 50 ppm or 0.000015 W
0 W to 12 W (10 W, 3 mA) Greater of 13 ppm or 0.00003 W
0 W to 120 W (25 W, 1 mA) Greater of 6.3 ppm or 0.00003 W
0 W to 400 W (100 W, 1 mA) Greater of 5 ppm or 0.0001 W
0 k W to 10 kW (10 kW, 10 mA) Greater of 6.3 ppm or 0.000015 k W
10 k W to 40 kW (10 kW, 10 mA) 10 ppm
40 k W to 100 kW (10 kW, 2 mA) 25 ppm
100 k W to 500 kW (10 kW, 1 mA) 100 ppm
2.2.2.4 Measurement Current Accuracy
Measurement current accuracy is guaranteed to meet the following specifications. The specifications are stated
as percent of selected current or in absolute mA.