Pine Research MSR 636A, Руководство пользователя

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DRU10002 (REV 004 / JAN 2017)
Figure 4.13: Connect Potentiostat to Earth Ground on Control Box Front Panel
If the potentiostat offers a chassis terminal connection (often located on the back
panel of the potentiostat), then connecting this chassis terminal to the earth
ground on the rotator control box may (or may not) reduce or eliminate noise in
the measured electrochemical signals. For a potentiostat with a chassis that
normally “floats” with respect to earth ground, the chassis will no longer be
floating after making this direct connection to earth ground.
Note:
The chassis terminal on the back panel of the Pine WaveDriver 10
and WaveDriver 20 potentiostats normally “floats” with respect to
the earth ground. If the potentiostat chassis is connected to the
earth ground on the front panel of the rotator control unit, the
potentiostat no longer “floats” with respect to earth ground.
If the potentiostat does not offer a chassis terminal connection (or if earth
grounding the chassis terminal is not an option), then a less desirable, but
alternative approach is to attempt to
make use of the potentiostat’s signal
ground (DC Common). If the DC Common (often provided as an alligator clip
connection on the cell cable) is connected to the earth ground on the rotator
control box, this may (or may not) reduce or eliminate signal noise.
In general, in an electrochemical experiment, it is always ideal to maintain as
much isolation between the DC Common, the earth ground, and the instrument
chassis as possible. Such isolation increases flexibility when working with
electrochemical cells that may contain earth grounded components. But in
almost all cases, a cell containing a rotating electrode does not have any earth
grounded electrodes, allowing some trade-off between flexibility and the use of
earth grounding to reduce signal noise.