Keithley 2750 User Manual

Model 2750 Multimeter/Switch System User’s Manual Measurement Considerations E-7
Ground loops
When two or more instruments are connected together, care must be taken to avoid
unwanted signals caused by ground loops. Ground loops usually occur when sensitive
instrumentation is connected to other instrumentation with more than one signal return
path such as power line ground. As shown in Figure E-2, the resulting ground loop causes
current to flow through the instrument LO signal leads and then back through power line
ground. This circulating current develops a small but undesirable voltage between the LO
terminals of the two instruments. This voltage will be added to the source voltage, affect-
ing the accuracy of the measurement.
Figure E-2
Power line ground loops
Signal Leads
Instrument 1
Power Line Ground
Ground
Loop
Current
Instrument 2 Instrument 3
2750-900-01.book Page 7 Wednesday, August 3, 2011 7:56 AM

Keithley 2750 Specifications

General

Interface	GPIB, RS-232, Ethernet
Switching Speed	Up to 500 channels/second
Maximum Voltage	300V
Operating Temperature	0°C to 50°C
Measurement Functions	DCV, ACV, DCI, ACI, 2-wire Resistance, 4-wire Resistance, Frequency, Temperature
Resolution	6.5 digits
Current	1A
Maximum Current	1A