L3Harris narda PMM EP-600 User Manual page 41

3.6 Preventing
measurement errors
To prevent influencing the field measurements the operator, vehicles etc.
should stay away of 5 meters from the field sensor; the same should not be
located near metallic or conductive surfaces and objects.
From the definition of difference of potential between two points:
r
2
= − 
V E dr
21
r
1
We obtain that, with constant difference of potential, when the
distance between the two given points diminishes, the field strength
increases.
Example: the field strength present between the two plates of a
condenser at a distance of 0,1 m and with 100 V applied is of:
100 V
= =
KV
E 1
m
0 1 , m
To remark that a voltage of 100 V applied in these conditions
produces a field strength of 1000 V/m, i.e. much higher than the
applied voltage.
Measurements 3-3