Grounding - Panasonic AFPE224300 User Manual

3.3.2 Grounding

Grounding to prevent noise
Under normal conditions, the inherent noise resistance is sufficient. However, in situations of excessive
noise, ground the instrument to increase noise suppression.
Use an exclusive ground
- For grounding purpose, use wiring with a minimum of 2 mm
resistance of less than100Ω.
- The point of grounding should be as close to the FP-e unit as possible. The ground wire should be as
short as possible.
- If two devices share a single ground point, it may produce an adverse effect. Be sure to use an exclusive
ground for each device.
Note: Depending on the surroundings in which the FP-e unit is used, grounding may cause
problems.
Example: The power supply line of the FP-e unit is connected to the function earth through a varistor. If
there is an irregular potential between the power supply line and the earth, the varistor may
be shortened.
Do not ground an FP-e function earth terminal when grounding a plus (+) terminal of the power
The FP-e tool port shielding and function earth terminal are connected.
In some computers, the SG terminal of RS232C port and connector shielding are connected.
When the FP-e is connected to a computer with a plus (+) terminal grounded, therefore, an FP-e's minus (-)
terminal is connected with the function earth terminal. As a result, short circuit occurs which may lead to the
breakage of FP-e and its neighboring parts.
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. The grounding connection should have a
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