Keithley 2182, User Manual, Page: 56 / 339

2-16 Voltage and Temperature Measurements
Figure 2-7 shows temperature only connections using an ice bath as a simulated reference
junction. Note that the connection points for the input cable and the thermocouple wires are
immersed in the ice bath.
Figure 2-7
Connections - temperature (simulated reference)
Voltage and temperature connections
Channel 1 should be used for voltage measurements since it supports a wider range of
measurements, leaving Channel 2 to measure temperature.
A connection example using the internal reference junction for temperature measurements is
shown in Figure 2-8 . In this example, Channel 1 measures the voltage drop across the DUT and
Channel 2 measures the temperature of the DUT. Notice the jumper wire from the thermocouple
to test circuit low. If the case of the DUT is metal and already connected to test circuit low, the
jumper would not be needed. Also, if there is enough thermal bonding between the DUT and test
circuit low, the thermocouple can be connected directly to low.
Figure 2-8
Connections - voltage and temperature (internal reference)
Test Circuit
DUT
HI
HI
LO
LO
black
red
TEMP1 CH 1
CH 2
2182
2107
Input Cable
Thermocouple
Ice Bath
Cable-to-thermocouple
wire connection (one
of two)
white
green
Test Circuit
DUT
HI
HI
LO
LO
DCV1 CH 1
CH 2
2182
Copper wire soldered directly
to LEMO connector (one of
two)
Thermocouple
TEMP2
Cable-to-copper
wire connection
(one of two)
Thermocouple wire soldered directly
to LEMO connector (one of two)