| The important thing to remember is that the device
ground should be connected with a crossover wire. Then ground is at
the potential lightning site. As a result, between the signal line
and the ground terminal (G) of an instrument, discharge voltage (Ve)
of the lightning surge protector can be added. |
•Separate wiring
A common-mode voltage V1, ground resistance (R) x lightning surge
current (i), is added to discharge voltage V2 at the lightning surge
protector between the signal line and a ground terminal of an instrument.
It may go over the withstand voltage of the instrument. |
•Wiring at instrument site
Voltage V1, suitable to a drop in voltage at a connected ground point,
is added to discharge voltage V2 at the lightning surge protector,
then added between the signal line and a ground terminal of an instrument. |
•Crossover wiring
Only discharge voltage in a lightning surge protector site can be
added to the space between the common and the signal line of an instrument.
The instrument should be protected. |
How
much resistance is appropriate when grounding the M-RESTER?
100
ohms or less.