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Install Additional Test Fixture Accessories
Thermocouples are used to measure the surface temperature of devices. Be very
careful, results obtained can be very different from actual test conditions if the
thermocouples are not handled correctly.
Figure 37 Type K Thermocouple Jacks on Test Fixture Front
Preparing the Thermocouple
The simplest method of preparing a thermocouple is to simply twist the wires
together several times. However, the temperature is measured at the first point
of contact with the device. The remaining section of the twisted pair becomes
unnecessary and may be cut off. This could result in compromising the contact of
the thermocouple wires resulting in unstable temperatures.
The best method is to spot weld the two thermocouple leads together.
Method of Securing the Thermocouple to a device
The easiest method is to tape the thermocouple to the device with polyimide
(Kapton) tape. This allows easily securing and removing the thermocouple.
However, this method also allows the tape and thermocouple to lift off the device
during a test. The tape can also interfere with the heat radiation pattern.
A better method is to use a minimum amount of epoxy adhesive to secure the
thermocouple to the DUT. The epoxy adhesive is not likely to peel of during the
test and requires a much smaller area to secure the thermocouple to the DUT.
This minimizes the effects on the measurements. Note that the epoxy must not
get between the thermocouple and the DUT; the thermocouple must remain in
direct contact with the DUT.
Keysight PD1550A Installation Guide
For early release versions of the PD1000A Control Software for the
PD1550A, these jacks and the device temperature are not
supported.
Accessory and Probe Installation
79
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