Appendix 8 Concerning Noise Countermeasures
A
16
Running the HiLogger on battery power
When the HiLogger is being powered by batteries and the AC adapter is not connected,
the ground current loop is eliminated, making it possible to reduce the effects of common
mode noise.
For measurements of short duration, powering the 8430-20 with batteries is an effective
method for eliminating noise.
Common Mode Noise Countermeasures
Connect the chassis GND on the signal side
to a good ground with a sufficiently low
ground resistance. If there is still a large
amount of noise, it may be possible to re-
duce the effects of common mode voltage
by connecting a bypass ground wire to the
GND terminal on the HiLogger.
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
HiLogger
Thermocouple
If it is not possible to simply ground the HiLogger or the signal side, connect a ground
wire between the chassis GND of the HiLogger and the signal side to equalize ground
potentials. A basic requirement for obtaining stable measurements is to ground the de-
vice.
Ground Wire
Содержание LR8400-20
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Страница 26: ...Operating Precautions 14...
Страница 96: ...3 9 Viewing and Editing with the All Channel Settings List 84...
Страница 112: ...4 3 Marking Waveforms and Searching Marks Search Function 100...
Страница 156: ...6 5 Transferring Data to a PC USB Drive Mode 144...
Страница 238: ...10 8 About Communications Commands 226...
Страница 256: ...11 3 LR8501 Universal Unit Specifications 244...
Страница 262: ...12 3 Disposing of the HiLogger 250...
Страница 296: ...Index Index 4...
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