lU^LU
I t~
However,
in many field applications
the WE electrode may
be grounded, either
deliberately or inherently
(e.g.,
a
steel
joist
or pipe buried
in the ground).
In this
case,
leave
the LO terminal
unconnected, to avoid
having
two grounded
points in
the circuit (which can
cause polarization instability).
It is permissible
to ground the WE, either
at
the instrument
or at a point
of the
users
choice (provided that
the GROUND-LO link is disconnected).
It is not
advisable
to
ground the
WE with the 20pA, 2pA and 200pA ranges
selected. For
grounded WE
the impedance measurement
errors will vary smoothly from
zero at
dc to ±10% at 10kHz.
If the cell container is metal
and grounded, it is usually
best to ground the
CE
electrode. However,
this reduces the frequency response
of the polarization
loop.
*
2.6
CSB/SI1287 User Guide/Issue AF
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