Figure 2-12 Measuring Switch Contact Resistance And Temperature - Keithley 2182 User Manual

High power switches — Heat is a factor in high power switching. As the temperature of the
switch increases, so does the contact resistance. In
by sourcing a constant high current (i.e., 10A) through it.
Figure 2-12
Measuring switch contact resistance and temperature
HI
CH 1 DCV1
LO
HI
CH 2
TEMP2
LO
2182
The Model 2182 measures both the voltage across the switch contact and the temperature.
These measurements allow you to develop a resistance vs. temperature profile. With current
known and voltage measured, resistance can be calculated using Ohms Law: R = V/I.
Voltage and Temperature Measurements
Figure 2-12
10A
Thermocouple
Switch
(DUT)
Test Circuit
heat is generated in the switch
Constant
Current
Source
2-25