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Production Sorting Test Sequence

Introduction

This sequence is a simple example of how to use the logic functions in SoundCheck to sort units based on their measured performance.  This particular example tests a unit’s 1 kHz sensitivity and displays it as being in ‘Group A’, ‘Group B’, or a failure. 

The sequence begins with an optional prompt to use stored data.  If the user chooses ‘Yes’, a file is loaded and they will have the option to then pick an example (Group A, Group B, Failure).  This is done through a numeric message step prompt and two limits to differentiate the answer.  If the user chooses ‘No’, the sequence will skip to the actual measurement section.  Once the data has been either measured or recalled from disc, the 1 kHz sensitivity is extracted, and the result is tested against two limit steps.  The first limit has a width of 6 dB and is used to judge whether the unit passes or fails.  If the unit passes it is tested against the second limit, which only has a width of 3 dB.  Passing this second limit places the unit in Group A, whereas failing it places the unit in Group B.  Depending on the result, one of three display steps is shown.  A text window tells the user which group the unit falls into or whether it is a failure. 

While this particular example sorts the units based on sensitivity, the same approach could be applied to other parameters.  Applying logic to the pass/fail result of limit steps opens up a lot of possibilities for processing, displaying, and storing data.  This would most often be used on simple transducers for dividing production lots into groups based on certain criteria.  This could also be used for pairing microphones, earphones, or loudspeakers for stereo applications.

 

Final display for production sorting sequence

 

Required Equipment

Hardware

• SCM-2 calibrated measurement microphone PN 4004 or equivalent
• SoundConnect Microphone power supply PN 4020 and Power amplifier (Crown D45 PN 5600 or equivalent) OR AmpConnect PN 4040

Software

• SoundCheck 8.1 or later
• Limits Listen p/n 2000
• Post-Processing Listen p/n 2004

 

System diagram

 

Hardware Setup & Calibration

1. Calibrate the amplifier as instructed in the SoundCheck manual.
2. Calibrate the reference microphone as instructed in the SoundCheck manual.
3. Connect the channel 1 (or Left) output of your soundcard to the input of the amplifier.
4. Connect the output of the amplifier to your loudspeaker. 
5. Position your reference microphone at the desired test distance from the loudspeaker, and connect it to the microphone power supply.
6. Connect the output of the mic supply to the channel 1 (or Left) input of your soundcard.

You are ready to start the sequence.

Further sequence development

Ways in which you could modify or further develop the sequence include:

• The sorting could be applied to any number of other parameters including frequency response and distortion.
• In addition to simply displaying the group that the unit falls into, the logic could be used to store the data into separate file locations.         

Download Sequence Documentation (PDF)

Download Sequence (Zip file)

To run the sequence in SoundCheck, please save the zip file to your hard drive, then follow the instructions in "Sequence Editor: Exporting/Importing a Sequence' section of the manual. Download Manual.