Kirchner Elektronik - Entwicklung, Herstelleung und Vertrieb des Audio Analyzers ATB in Braunschweig

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ATB 701 PC

Measurement program ATB 701PC

1. Construction for the measurement

The measurement system existsMitteln of the ATB 701 USB Box, a Net PC with Windows XP and the program.

The calibrated measure microphone is included in the ATB 701PC bundle.
Professional measurement can not be easier. The price is very favourable.

 

2. Measurements

Frequency response of amplitude

Amplitude      Sound pressure   Impedance

                                                                     

Frequency response of phase

                                  

                                  

Step response

                                  

                                  

Measurement with analysis

Distortion                   Thiele-Small                    Quality

3. Measurement functions

Single measurement                      Duration measurement Current         Averaged

4. Display, handling

Parameter     Plot management     Combine

 

 

 

4. In and output controller

   The output level is set with the output controller.
   The displayed value is the level from a sine wave in dBV.
   0db = 1V. Range: -15dB (0,18V) – 15dB (5,6V)

   The input level is set with the input controller. The input is to set for the    max green bar. The bar should not get read. The plot is independent from    the controller. It shows only the level of the in signal.
   Range: 0dB - -21dB, in 1,5dB steps.

6. Displays

   The level meter shows the RMS sound pressure in dB.

 

   The display is for Mag and IMD measurement. It shows the THD
   in %.

 

   The display is for Mag und IMD measurement. It shows the Q-Index for    the Rub&Buss measurement.

 

7. Sound Pressure Level, SPL

   The SPL measurement is very easy
   The ATB 701 box is switched to SPL. After that, the speaker
   and the microphone are connected to the box. In the SPL    active menu the distance of the microphone to the speaker
   and the nominal impedance of the speaker are to set.
The plot shows the pressure for 1W/1m.

The SPL measurement is also for the noise. The pressure is shown with the RMS level meter with the C weighting. The plot shows the FFT of the noise. To set the time window the program has very complex calculations. Thanks to it the result is always right and reproducible. Scale range: 5dB to 60dB. Maximum level for HiFi- and automotive speaker 105dB, for professional speaker 120dB.
Frequency range: 20Hz – 20kHz.

8. Impedance

For the impedance measurement the ATB 701 box is set to IMP. The speaker is connected to the box. All settings are automatically done by the program. The impedance plot could be combined with the SPL plot. The scale is at the right side of the plot.
Scale range: 50?. For professional speaker 250 ?. Frequency range: 20Hz – 20kHz., Thiele-Small measurement 12Hz – 8kHz
Precision: + 2%

9. Mag measurement

The Mag measurement is for the frequency test of studio, HiFi and home cinema equipment. For the electrical measurement there are adapters. To set the scale for the special measurement there is the scale-shift function.

10. Phase

The phase measurement is done with the Mag, SPL und Imp measurement. In the Mag and Imp  measurement the electrical phase is shown. In the SPL measurement the acoustic phase is shown. The acoustic phase is a function of the distance of the microphone and speaker. The setting of the distance is done automatically by the ATB program. This complex calculation always gives the right acoustic phase.

Acoustic phase of the speaker Analog.on Richtig

Scale: +180° to -180°
Frequency range: 20Hz – 20kHz

11. Step

The Step shows the time response.
The normal two way box with bass-mid range speaker and tweeter has a time delay between the speakers. With the delay the box can not reproduce the original signal. To get the original there is the need of a digital delay. This delay is to set with the Step measurement.

The following plots show the setting of the delay.

The tweeter is in front

The tweeter is in back

   The delay is right. At the beginning of
   the plot the signal of the tweeter is shown.    Then there is the signal of the bass-mid    range speaker. The two signals do fit
   together.

12. Total Harmonic Distortion THD

The distortion measurement shows the THD and the harmonics H2, H3, H4, H5.
After the measurement it can be decided between the THD and H2, H3, H4, H5 plot.
The sound pressure for the measurement is set in the SPL menu.
Scale: 1%, 10%, 100%
Frequency range: 20Hz – 8kHz
Precision: > 0.01%

                                        
 

Distortion of a speaker

13. Intermodulation Distortion, IMD

The intermodulation distortion measurement has the RB Signal for testing. The RB Signal is for nonlinear distortion measurement. Wolfgang Klippel, Germany, describes the distortion from nonlinear systems.
The basic for this measurement is a generator signal with consists of two sine waves. The signal is modulated at the nonlinear transfer response of the system under test. The result is the IMD spectrum.
The IMD measurement is used for the Rub&buss to test the mechanical quality of the speaker. In production line the speakers tend to have defects. The RB signal includes two sine waves. The ratio from the frequencies is 13. There are the signals RBlow for woofer testing, RBmid for testing the mid range speaker and RBhigh for the tweeter.

           

There is a display for the Q-Index. It shows the harmonics in relation to the fundamentals.
A second measurement in the IMD menu is a frequency analyser. For the test is to set a sin signal is to set. The frequency for the signal can be set in the range from 20Hz – 20kHz.

Frequency range: 20Hz – 20kHz
Dynamic Range: 110dB

           

14. Thiele-Small Parameter

The ATB 701PC program includes a very comfortable and precise Thiele-Small parameter measurement. The measurement is like the ATB precision.
To avoid errors it is always to be checked if the values are right. If not there is a message.
The weight method is used.

The program also calculates the voice coil induction L.

15. ATB 701

The ATB 701 audio analyser is for speaker and acoustic and electric measurements in the audio range. The PC drives the instrument via the USB. The measurement is independent from the soundcard of the PC.
The USB unit consists of power amplifier, microphone amplifier, impedance switch and converters. It is delivered with a calibrated measurement microphone.

Technical data of the ATB 701

Microphone input:	Frequency range 20Hz – 22kHz, +0.1dB Input range 65mV – 0,7V, noise < -70dB Input impedance 2.2kO, microphone-power 6VDC
Lautsprecherausgang:	Frequency range 20Hz -22kHz, + 0.2dB Power 4O =10W, 8O = 5W Distortion < 0.05%
Thiele-Small:	12Hz – 8kHz, 1%
Connection:	USB 1.1 or USB 2.0
Power:	230V~ / 50Hz / 55VA or 110V~ / 60Hz / 55VA
Dimensions:	320 x 64 x 253 mm

 

For more information you can download the manual (Download PDF)

Kirchner elektronik
Dipl.-Ing. Leo Kirchner
Wilhelm-Bode-Str. 38
D-38106 Braunschweig