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Temperature Control Troubleshooting
TP04300 Series Interface & Applications Manual D-7
Steady State Error DUT temperature extremely slow changes or stays at steady state below the setpoint
• DTYP - Try to use lower DTYP, if you are already at DTYP 0, see the Thermal Constant
adjustments
• Thermal Constant – Decreasing Thermal Constant will reduce damping and will make
temperature control more aggressive. Gives you a faster time to reach the set point
• Air Max and Min temperature limits – increase the limits on air temperature
• Air DUT max – increase the Air-to-DUT
• Autotuning - Tune system to your test setup; may still need to adjust the Thermal Con-
stant
• Air Flow – limit the air flow
• Verify compressor - must be ON (i.e. “Heat Only Mode” is not selected in the Utilities
Screen)
• Verify your setup – if TP04300 runs at its max heat/cold power, but fails to reach the set-
point, check you test setup for leaks
• Verify temperature sensor mount and location
• Refer to TP04300 system specifications
Uneven temperature
distribution
This generally occurs with larger DUTs under the thermal cap or in the Thermal Fixtures.
• Soak time – increase soak time
• Air-to-DUT difference – decrease to slow the transition time
• Air DUT max - decrease to slow the transition time
• Experiment with a temperature sensor location
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