Ground Resistance Tester Models 3705
- 24 -
Above Telephone Space
The reading you measure with
the 3705 indicates the bonding
connections between the Tele-
phone ground and the Power
company ground. One of the
following two scenarios should
be observed:
A. If “OL” or a high resistance
reading is displayed this
would indicate no bond has
been established or a poor
connection exists between
the Telephone and Power
grounds.
B. If
4
and/or a very low
reading is displayed then the
bond between these two
grounds has been verified.
General Measurement Notes
A reading of OL is most likely a cable which is not connected to the
ground at both ends. It may be there is no ground rod at all, or that there
is no path back to the system neutral.
A reading which is < 0.1
Ω
R .1
generally indicates that the cable where
you are clamped is continuous with itself. You may have located a
ground loop, which can usually be confirmed by comparatively high
current readings also obtained when readings are taken at multiple
locations. A good low resistance ground may also have very high AC
current flowing, depending upon the type of equipment being grounded.
Figure 20
