Troubleshooting
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8.3 Overheating
If a thermal shutdown occurs because of loading the voltage or current
outputs a long time by high burden, the Test Universe displays the following
messages respectively in the Status History window:
• “Voltage overtemperature:” followed by a list of the affected
outputs
“CMC switched off.”
“Test stopped with error.”
• “Current overtemperature:” followed by a list of the affected
outputs
“CMC switched off.”
“Test stopped with error.”
The thermal shutdown can be avoided by reducing the compliance voltage
of the current amplifiers, i.e., to optimize the output power limit of the current
outputs set the compliance voltage of the internal current amplifiers.
To do so, go to the Compliance Voltage group box of the Output
Configuration Details dialog box in the Test Universe Hardware
Configuration.
By reducing the power supply voltage, the ON-time can be prolonged
considerably for low-ohmic burdens, because this causes the internal
amplifier to consume less power. Hence, the internal heat dissipation can be
reduced, especially when testing with low burden test objects. This then
considerably extends the time until the device switches OFF due to thermal
overload.
For more detailed information refer to the Test Universe Help. Select the
Hardware Configuration Help and navigate to the topic Setting the
Current Output Power Limit of CMC Test Sets.
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