Microphone Test (MT)
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Microphone Test Software


This TDS based software was developed to test microphone or capsule prototypes under development and also to test production microphones to see whether they meet tolerances for sensitivity, frequency response, and off-axis attenuation. "Mictest" gives Manufacturers and consultants the tools to define and implement standards in an ordinary room without the cost of a conventional anechoic chamber, or costly vibration isolated rooms.

In addition to the traditional TDS measurements. the program has added many of the functions previously only available in Speaker Test, including customized envelopes for Pass/Fail production testing. Up to 3 separate envelopes are available to grade microphones based on the microphone response. For production test you create and save the production tolerances (envelopes) for a particular models frequency response, sensitivity, off axis attenuation and set up the production test sequence.

In the Test Sequence (Measurement Sequence) the computer will load frequency-response and sensitivity envelopes, run a TDS sweep, and show a prompt such as PASS, FAIL, or other user defined prompts.

The New microphone test software for the TEF has a cost of $1200 dollars. Given that a traditional testing room can easily cost $50,000 or more, and that the pass fail program can be operated by production staff, the system is highly cost effective.

Minimum requirements for this program:
IBM compatible PC with MS-DOS 6.0 or higher
486 processor with a math coprocessor
8 MB memory
hard drive
1.44 MB floppy drive
VGA monitor
TEF-HI card

Time Delay Spectrometry is a valid new way of testing microphones with several advantages over anechoic-chamber methods. TDS testing has been used successfully for 14 years by a microphone manufacturer for prototype and production testing.

To speak with the TEF Sales Department, call 203-938-2588.



 Package contents
Microphone Test software and manual
Test types
Time Test (ETC)
Frequency Test (TDS)
Test types (with pass/fail window option)
On-axis frequency response
Off-axis frequency response
Off-axis attentuation
Test sequence
A specific production sequence can contain from one to 30 lines of screen text, buzz tests and remote triggering along with the above test types in any order or combination.

Primary features

  • Operator or engineer mode
  • View detail of each measurement
  • Smoothing of data and pass/fail limits
  • Tracking by serial number information
  • Output can be ported to screen, disk or printer
  • Statistical information on each model or batch
  • Password protection for Engineer mode
  • Multiple methods of establishing pass/fail limits
Modes of operation
Operator mode: This mode is used by an operator performing routine automated testing. Options available in Operator mode are limited to those designed into the test by the engineer.
Engineer mode: This mode is used by quality assurance and engineering personnel who design and supervise the individual measurements and tests that make up overall product testing.

Pass/fail limits

Pass/fail limits can be created in various ways:

  • Setting an envelope in a specified range above and below a referenced microphone
  • Statistical analysis of the measurements of a batch of microphones
  • Using the cursor to draw any arbitrary limits

Once a pass/fail limit is created, it can be modified manually by the use of a cursor.

 Operator mode-main menu commands
1) Select test
2) Do test
3) Set delay
4) Set amp level
5) Graph display (on-off)
6) Saved for future commands
7) Statistics
8) Keyboard/barcode input
9) Stop test
10) Quit
Selections 3, 4, 7 and 8 can be enabled or disabled at the option of the engineer.
Bar code reader
To gather information, start tests
For data gathered in one specific test type; engineer mode only
Difference mode
Shows the difference between a measurement and the data in reference memory
External Trigger
External devices can be triggered through a parallel port on the computer
TEF requirements
Works with TEF20HI or TEF20SHIP with DSP host interface card
Printers supported
Epson FX, Epson LQ, and HP LaserJet
Computer system requirements
Microprocessor- 486 with math coprocessor
RAM- Eight megabytes of available memory
Monitor- VGA (640x480)
Hard disk - 80 megabytes
Floppy disk - 1.44 megabytes
Interface- One unused 8-bit ISA PC slot for installation of DSP host interface card.
Operating system- DOS version 6.0 or newer
®The trademark SOUND LAB is licensed under United States Trademark Registration No. 1,424,678 and 1,732,027.

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To speak with the TEF Sales Department, call 203-938-2588.