Appendix 8 Concerning Noise Countermeasures
A
18
Running the measurement units on battery power/ Running a wireless
logger on dry cells
When the measurement unit is being powered by batteries Running a wireless logger on
dry cells and the AC adapter is not connected, the ground current loop is eliminated,
making it possible to reduce the effects of common mode noise.
Common Mode Noise Countermeasures
Connect the chassis GND on the signal side
to a good ground with a sufficiently low
ground resistance.
Noise current (i1) and (i2) can be sup-
pressed by suppressing the common
mode voltage with a low-resistance
ground wire or a bypass between ground
poles. This suppresses the generation of
normal mode voltages and reduces the
effect on measurements.
Inverter or Commercial
Power Supply
Electro Magnetically Induced
Noise
Electrostatic Inductance Noise
Ground Wire
Coupled Impedance
Normal Mode Voltage
Voltage Generated by Ground Current
(common mode voltage)
Ground Impedance
Device being
Tested
measurement
unit
Thermocouple
Содержание LR8410-20
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Страница 12: ...Contents x...
Страница 32: ...Operating Precautions 20...
Страница 78: ...2 7 Compensating for Input Circuit Offset Zero Adjustment 66...
Страница 122: ...3 10 Viewing and Editing with the All Channel Settings List 110...
Страница 138: ...4 3 Marking Waveforms and Searching Marks Search Function 126...
Страница 222: ...9 4 Synchronous Measurements with Multiple instruments 210...
Страница 316: ...13 3 Disposing of the instrument 304...
Страница 360: ...Index Index 4...
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