Screening test of HVAC sensor

Screening test of HVAC sensor

The tested product is a temperature sensor including a fan. This sensor is used as a feedback for automotive HVAC. We test the product at the end of the production process (End Of Line test) and in addition, 1% of production is tested in the climate chamber and in the sound cancelling chamber (Sample test).

End Of Line Test

The aim is to test 100% of product production in order to verify their basic functionality. The test must be very fast so as not to slow down the production process. To ensure a sufficient testing speed, 8 products are always measured simultaneously.

 


Measured values:

  • Temperature
    • Accuracy ± 0.5 ° C against reference
    • 10 Hz sampling
  • Current
    • Accuracy ± 0.1mA
    • 10 Hz sampling
  • Number of revolutions
    • Accuracy ± 10 RPM (normal value 5000 RPM)
    • 10 Hz sampling

Used HW

 

Sample test

Sound cancelling chamber

The aim of the measurement in the sound cancelling chamber is accurate testing of the acoustic properties of the product. The product is equipped with a fan that produces acoustic noise during operation. four products are placed in the chamber at the same time, but they are tested one by one. By placing four products at the same time, the handling time is reduced and the testing process becomes more efficient.

Acoustic chamber

Measured values:

  • LAFmax background noise
    • Sampling <1sec
    • Maximum value 22dB / A
  • LAFmax Sample
    • Sampling <1sec after 5s after switching on
    • Maximum value 40dB / A
  • LAeq (Equivalent continuous sound level)
    • Average value for 10s
    • Maximum value 28dB / A
  • Speed
    • Accuracy ± 10 RPM (normal value 5000 RPM)
    • 10 Hz sampling

HW:


Climate Chamber Test

The aim of the test in the climatic chamber is to verify the correct functionality of the product in the temperature range from -20 ° C to + 80 ° C. Testing takes place at defined points of the temperature profile, usually after the product temperature has stabilized. The temperature profile lasts on the order of hours and during it the supply voltage changes. This tests the product for the limit conditions in which it must operate. To ensure the efficiency of the testing process, we test 32 pieces at a time.

Climatic chambreClimatic chambre

Measured values:

  • LAFmax background noise
    • Sampling <1sec
    • Maximum value 35dB / A
  • LAFmax Sample
    • Sampling <1sec
    • Maximum value 45dB / A
  • LAeq (Equivalent continuous sound level)
    • Average value for 10s
    • Maximum value 45dB / A
  • FFT analysis
    • Range 6 - 20kHz without peaks
    • Central frequency 10kHz
  • Current
    • Accuracy ± 0.1mA
    • 10 Hz sampling

Used HW:

  • Unites Cabinet Modular Tester
  • Unites Power Distribution Unit
  • Clima Temperature Systeme CTS T-40/50 (-40°C +180°C)
  • Brüel & Kjær 2250 L
  • TDK Lambda Z20-10-U
  • Keysight DMM 34465A
  • VPC G6 interface
  • Industrial PC with UPS
     

Contact: 

 Karel Neřád       

Karel Neřád

 

 

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