Keithley 2001-TCSCAN User Manual

Model 2001
-TCSCAN Scanner Card User's Manual Section 3:
Operation
2001-TCSCAN-900-01 Rev. A / April 2018 3-17
Ground loops
When two or more instruments are connected, you must take precautions to avoid unwanted signals
from ground loops. Group loops typically occur when sensitive instrumentation is connected to other
instrumentation with more than one signal return path such as power line ground. As shown in the
following figure, the resulting ground loop causes current to flow through the instrumentation LO
signal leads and then back through the power line ground. This circulating current develops a small
but unwanted voltage between the LO terminals of the two instruments. This voltage will be added to
the source voltage, affecting the accuracy of the measurement.
Figure 24: Power line ground loops

Keithley 2001-TCSCAN Specifications

General

Brand	Keithley
Model	2001-TCSCAN
Category	Test Equipment
Language	English