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3
Measurement Tutorial
Table 3-2
Power dissipation for various resistance ranges
Range
100 Ω
1 kΩ
10 kΩ
100 kΩ
1 MΩ
10 MΩ
100 MΩ
Errors in high resistance measurements
When you are measuring large resistances, significant errors can occur due to
insulation resistance and surface cleanliness. You should take the necessary
precautions to maintain a "clean" high-resistance system. Test leads and fixtures
are susceptible to leakage due to moisture absorption in insulating materials and
"dirty" surface films. Nylon and PVC are relatively poor insulators (10
compared to Polytetrafluoroethylene (PTFE) insulators (10
nylon or PVC insulators can easily contribute a 0.1% error when measuring a
1 M
54
Test current
1 mA
0.83 mA
100 mA
10 mA
900 nA
205 nA
205 nA || 10 MΩ
resistance in humid conditions.
Ω
DUT power at full scale
100 mW
689 mW
100 mW
10 mW
810 nW
420 nW
35 nW
9
13
). Leakage from
Ω
Keysight U2741A User's Guide
) when
Ω
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