Service manual
8508A
Service Manual
1-10
DC Current
DC Current
[1] [2] [3]
Uncertainty Relative to Cal Stds Absolute Uncertainties
± (ppm Reading + ppm Range)
[4]
Range Full Scale
[15]
24 hour
TCal ±1 °C
90 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±5 °C
95 % Confidence Level
200 μA 199.990 00 5.5 + 2.0 6.0 + 2.0 6.5 + 2.0 12 + 2.0 12 + 2.0
2 mA 1.999 900 0 5.5 + 2.0 6.0 + 2.0 6.5 + 2.0 12 + 2.0 12 + 2.0
20 mA 19.999 000 6.5 + 2.0 7.0 + 2.0 8.0 + 2.0 13 + 2.0 14 + 2.0
200 mA 199.990 00 28 + 4.0 30 + 4.0 33 + 4.0 36 + 4.0 48 + 4.0
2 A 1.999 900 0 80 + 8.0 125 + 8.0 170 + 8.0 170 + 8.0 185 + 8.0
20 A 19.999 000 200 + 20 290 + 20 380 + 20 380 + 20 400 + 20
99 % Confidence Level
200 μA 199.990 00 7.0 + 2.0 7.5 + 2.0 8.0 + 2.0 15 + 2.0 16 + 2.0
2 mA 1.999 900 0 7.0 + 2.0 7.5 + 2.0 8.0 + 2.0 15 + 2.0 16 + 2.0
20 mA 19.999 000 8.0 + 2.0 9.0 + 2.0 10 + 2.0 16 + 2.0 18 + 2.0
200 mA 199.990 00 35 + 4.0 37 + 4.0 40 + 4.0 45 + 4.0 60 + 4.0
2 A 1.999 900 0 100 + 8.0 150 + 8.0 205 + 8.0 210 + 8.0 225 + 8.0
20 A 19.999 000 250 + 20 350 + 20 450 + 20 455 + 20 500 + 20
DC Current (Secondary Specifications)
[1] [2] [3]
Temperature Coefficient
Input Impedance (Ω)
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
Range
Front Rear
± ppm Reading/°C
200 μA
150 150 0.4 0.6
2 mA 15.2 15.2 0.4 0.6
20 mA 1.8 1.9 1.2 1.8
200 mA 1.2 1.3 6. 0 9.0
2 A 0.3 0.4 8.0 12
20 A 0.04 - 15 20
Type........................................................................ Multi-slope, multi-cycle A-D Converter
Protection
Front Input............................................................... 20 A rms
Rear Input ............................................................... 2 A rms, Rear Panel Fuse
Settling Time
200 μA to 200 mA Ranges, to 10 ppm step size .... Filter Out < 50 ms, Filter In < 1 s
2 A Range
to 100 ppm step size........................................... < 1 s
to 75 ppm step size............................................. < 30 s
to 30 ppm step size............................................. < 5 minutes
20 A Range (at 10 A)
to 300 ppm step size........................................... < 1 s
to 250 ppm step size........................................... < 30 s
to 100 ppm step size........................................... < 5 minutes
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