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Browse by CategoryChassis ground is used to connect the instrument case, or chassis, to an earth ground. It is not usually necessary to use this ground point, and not using it can avoid the occurrence of 'ground loops'.
Circuit ground is a reference point chosen for the instrument circuit voltages. This reference point is typically located on the ground side of the instrument's internal power supply.
Chassis and circuit grounds do not need to be connected to each other for proper instrument operation. In fact, it is often undesirable to link them. If desired, these two ground points can be tied to each other by linking the two terminals (if available) located on the rear of the instrument.
The best approach to determining which connection strategy to use is to begin by severing the link between the chassis and circuit grounds. Then minimize any external noise sources and measure the final noise amplitude. Then reconnect the two grounds an look to see if the amplitude of the noise increases or decreases. If the noise increases or remains the same, then re-sever the link between the two grounds.
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