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2-20
Measurement Concepts
Table 2-6 (cont.)
Summary of measurement considerations
Considerations
For all measurements:
Ground loops
Triboelectric effects
Piezoelectric and stored
charge effects
Electrochemical effects
Humidity
Light
Electrostatic interference
Magnetic fields
Electromagnetic interference
(EMI)
Description
See Appendix C for details
Multiple ground points can create error signals.
Charge currents generated in a cable by friction between a conductor
and the surrounding insulator (i.e. bending a triax cable).
Currents generated by mechanical stress on certain insulating
materials.
Currents generated by the formation of chemical batteries on a
circuit board caused by ionic contamination.
Reduces insulation resistance on PC boards and test connection
insulators.
Light sensitive components must be tested in a light-free
environment.
Charge induced by bringing a charged object near your test circuit.
The presence of magnetic fields can generate EMF (voltage).
EMI from external sources (i.e. radio and TV transmitters) can
affect sensitive measurements.
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