Service manual

8508A
Service Manual
1-16
Resistance - Normal Mode (Secondary Specifications)
[1] [2] [3] [10]
Temperature Coefficient
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
Range Measurement Current
Transfer Uncertainty
20 mins ±1 °C
± (ppm Reading
+ ppm Range)
± ppm Reading/°C
2 Ω
100 mA 2.0 + 2.0 1.5 2.5
20 Ω
10 mA 0.8 + 0.7 0.6 1.0
200 Ω
10 mA 0.2 + 0.15 0.5 0.8
2 kΩ
1 mA 0.2 + 0.15 0.5 0.8
20 kΩ 100 μA
0.2 + 0.15 0.5 0.8
200 kΩ 100 μA
0.2 + 0.15 0.5 0.8
2 MΩ 10 μA
0.5 + 0.5 0.6 1.0
20 MΩ 1 μA
2.5 + 5 2 3
200 MΩ
100 nA 15 + 50 20 30
2 GΩ
10 nA 200 + 500 200 300
Resistance - Lo Current Mode (Secondary Specifications)
[1] [2] [3] [10]
Temperature Coefficient
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
Range Measurement Current
Transfer Uncertainty
20 mins ±1 °C
± (ppm Reading
+ ppm Range)
± ppm Reading/°C
2 Ω
100 mA 2.0 + 2.0 1.5 2.5
20 Ω
10 mA 0.8 + 0.7 0.6 1.0
200 Ω
1 mA 0.8 + 0.7 0.6 1.0
2 kΩ 100 μA
0.8 + 0.7 0.6 1.0
20 kΩ 10 μA
0.8 + 0.7 0.6 1.0
200 kΩ 10 μA
0.5 + 0.5 0.6 1.0
2 MΩ 1 μA
2.0 + 0.5 2 3
20 MΩ
100 nA 15 + 5 20 30
200 MΩ
10 nA 200 + 500 200 300
2 GΩ
10 nA 200 + 500 200 300
Resistance - High Voltage Mode (Secondary Specifications)
[1] [2] [3]
Temperature Coefficient
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
Range
[9]
Measurement Current
Transfer Uncertainty
20 mins ±1 °C
± (ppm Reading
+ ppm Range)
± ppm Reading/°C
20 MΩ 10 μA
0.5 + 0.5 0.6 1.0
200 MΩ 1 μA
2.0 + 0.5 2.0 3
2 GΩ
100 nA 15 + 50 20 30
20 GΩ
10 nA 200 + 500 200 300
Type........................................................................ True 4-wire with Ohms guard. 2-wire selectable.
Max Lead Resistance............................................ 10 Ω in any or all leads, 1 Ω on 2 Ω range
Full Scale Measurement Voltage
Normal Mode .......................................................... 200 mV/2 V/20 V
Lo Current Mode ..................................................... 200 mV/2 V
High Voltage Mode ................................................. 200 V
Protection (All ranges) .......................................... 250 V rms, 360 V pk
Ratio Accuracy
Range to Range...................................................... ±(Net Front Input Accuracy + Net Rear Input Accuracy)
Within Range .......................................................... Apply 24 hour or 20 minute Transfer Uncertainty specifications
Settling Time ......................................................... Up to 200 kΩ range generally the same as DC Voltage Filter In but
depends on external connections
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