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Grounds and Additional Test Equipment
Most electronic test equipment, including oscilloscopes, signal generators, and data loggers, have an earth
ground on their inputs and outputs. Connection of an instrument of this type in your system will earth-ground
the system. For example, connection of a bench oscilloscope to the Reference 3000's Isig monitor BNC
connector earth-grounds the system.
Do not use additional electronic test equipment connected to your Reference 3000 or Reference 30k Booster
unless absolutely necessary. If you must use additional equipment, make sure that your cell is isolated from
earth ground.
Reference 30k Booster Use in Systems Isolated from Earth Ground
Most laboratory electrochemical cells are isolated from earth ground. A glass cell on a bench top is an obvious
example. Commercial packaged batteries and supercapacitors are usually tested with the device isolated from
earth ground.
Be careful: earth connections on a high-powered system may not be obvious. Water-cooled cells and systems
containing large AC-power pumps may have earth connections. Earth connections can also occur in a fault
condition, such as a water leak or dielectric failure.
In most cases, you can leave the System Ground isolated from earth ground.
If you are testing a cell that is isolated from earth ground, earth-grounding your instrument system can reduce
noise. The pair of ground terminals on the rear panel of the Reference 30k Booster was provided so a user can
easily connect System Ground to Protective Ground. A shorting bar suitable for making this connection was
provided with the system.
Grounds and Floating Operations
Figure B-4
Storing Ground Jumper When Disconnected
48
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