Keithley 3730 User Manual

Series 3700
System Switch/Multimeter User's Manual Section 5:
Basic Digital Multimeter (DMM) Operation
Document Nu
mber: 3700S-900-01 Rev. A / August 2007 5-
21
NOTE The various instrument operations, including OCOMP, are performed on the input
signal in a sequential manner.
For a normal resistance measurement, the Series 3700 sources a current (I) and measures the
voltage (V). The resistance (R) is then calculated (R=V/I) and the reading is displayed.
For offset-compensated ohms, two measurements are performed: one normal resistance
measurement, and one using the lowest current source setting.
The offset-compensated ohms reading is then calculated as follows:
Offset-compensated ohms reading = V/I
where:
V = V2 - V1
I = I2 - I1
V1 is the voltage measurement with the current source at its normal level.
V2 is the voltage measurement using the lowest current source setting.
The above 2-point measurement process and reading calculation eliminates the resistance
contributed by the presence of V
EMF
.
Enabling/disabling offset-compensated ohms
Offset-compensated ohms is an attribute set on the 4-wire ohms (4W) function. To enable or
disable it from the front panel:
NOTE To enable offset-compensated ohms, the Series 3700 must be in 4W mode (see
figure).
Figure 5-11: Enabling offset-compensated ohms
NOTE The Series 3700 is in four-wire ohm mode when the 4W is displayed. Offset
compensation is active when the OC+ is displayed (OC- is shown in the above figure).

Keithley 3730 Specifications

General

Brand	Keithley
Model	3730
Category	Multimeter
Language	English