Section 2: General operation
2606B System SourceMeter® Instrument Reference Manual
2-48
2606B-901-01 Rev. B / May 2018
The 4-wire sensing method, as shown in the following figure (4-wire resistance sensing), minimizes or
eliminates the effects of lead resistance by measuring the voltage across the resistor under test with
a second set of test leads. Because of the high input impedance of the voltmeter, the current through
the sense leads is negligible, and the measured voltage is essentially the same as the voltage across
the resistor under test.
Figure 25: Four-wire resistance sensing
Power measurements
Power readings are calculated from the measured current and voltage as follows:
Where:
P
is the calculated power
V
is the measured voltage
I
is the measured current
Basic power measurement procedure
If you need to customize the standard wattmeter configuration of the MODE key, perform the
following steps to make power measurements. The following procedure assumes that the 2606B is
already connected to the device under test (DUT) as explained in
(on page 2-