Main Functions

The following items of loudspeaker can be speedy measured :

(1) Frequency response     (2) Sound pressure sensitivity at 1 kHz (1 kHz can be changed)     (3) Average sensitivity of sound pressure within a frequency range     (4) Polarity     (5) DC  Resistance (DCR)     (6) AC Impedance (ACZ)     (7) Distortion at 6 points     (8) Fo     (9) Qe     (10) Qt     (11) Qm     (12) Automatic PASS/FAIL judgment of above items (1) to (8)     (13) Curve of distortion against frequency     (14) Curve of distortion against SPL     (15) Curve of AC impedance.

Note : Type 1600S can test the Loudspeaker System or Loudspeaker Unit.

The fundamental combination of Type 1600 S                                   

Item

Model No.

1.

160 A

 Electroacoustic Analyzer

Mainframe. To control  and process the input、output signal.

2.

Monitor &

Keyboard

 High Resolution Color Display Monitor & Keyboard

Display the tested results & data and key in data. User may buy these two items at his local market, since price is cheaper and can save freight charge and import tax.

3.

171

Electroacoustic Testing Adapter

Combines with 160 mainframe, to test the freq. response curve、sensitivity、impedance、Fo、polarity、distortion 、 parameter etc. of the loudspeaker 、 headphone 、 speaker box.

4.

8120H

Measuring Microphone

Its frequency response curve is very flat、precise and stable, can test the freq. response curve and sensitivity of the loudspeaker, or can be used as a feedback microphone.

5.

X-Y Mouse

Mouse

Replace the upward, downward, leftward, rightward and enter keys on the keyboard.

6.

HP Printer

( Option )

Printer (All the HP DeskJet or HP Laser Printers that are supported by DOS can all be used.)

Print out the tested results & data.

Functions and Specifications of  Type 1600 S                                   

(1)   Frequency response curve : Sweep range can be set from any two frequencies between 20 Hz to 30 kHz. The interval of sampling frequency points can be set from 1/12, 1/24 or 1/48 octave (1/12 Oct. means 12 points in one octave). Two response curves can be stored (in two colors) for comparison purpose. The dB value of each curve at any frequency, or the difference between two curves can be read out directly. 

Dynamic range of frequency response : 70 dB in two ranges: 50 to 120 dB SPL and 70 to 140 dB SPL.

Test voltage for response measurements can be set freely : 0.005V ~ 18V.Accuracy: +/- (0.8%+0.0003V),  Resolution: 0.002V.

Output power : 0 to 40W (8Ω), 0 to 25W (4Ω) and 0 to 12W (2Ω).

Set of the upper & lower limits of the frequency response : Use 1 to 5 loudspeakers to draw 5 reference curves on screen. This system will expand +/- X dB automatically according to the outline of the curves to form the upper and lower limit curves. The value X can be set by the user. After that, any point at each curve can be modified freely to fit the real requirement. When frequency response is measured, the measured curve is compared with the limits to determine PASS or FAIL automatically, and a beep means fail.

Tolerance in frequency response and sensitivity test :

(A)    Main unit 171: +/- 0.1 dB (50 Hz to 20 kHz);  +0.1/-0.3 dB (20 Hz to 30 kHz).

(B)    8120H measuring microphone: -46.0 dB V/μbar +/- 0.5 dB @ 1 kHz; Frequency response +/- 1 dB (30 Hz to 7 kHz) , +/- 1.5 dB (20 Hz to 20 kHz).

(2), (3) Sound pressure sensitivity : After the sweep, the 1kHz Sound pressure sensitivity is displayed automatically. The average value of dB SPL (average sound pressure sensitivity) is than calculated automatically within the frequency range f₁ to f₂ and displayed. Values of f₁  and f₂ can be set freely in the range of 20 Hz to 20 kHz. The upper and lower limits for these two sensitivities can be set respectively and the automatic PASS/FAIL judgment will be performed and displayed.

(4) Polarity : 1600S and 1600F can measure the polarity of loudspeakers directly.

(5), (6) and (15) DCR, ACZ and Impedance curve:

DCR : Test range from 0.00Ω to 1000Ω,  Accuracy : +/-  (1% of rdg. + 0.05Ω), Resolution: 0.01Ω.

ACZ : Test range from 0.00Ω to 4000Ω

 Accuracy : +/- (1% of rdg. + 0.05Ω)  for ACZ<1 kΩ

  +/- 2% of rdg. for ACZ = 1kΩ to 4kΩ ,  Resolution: 0.01Ω

Impedance curve : Impedance curve can be drawn out in any band within the range of 20 Hz to 30 kHz.

(7), (13) and (14) Distortion measurement : There are three modes:

A.  Distortion measurement at six frequency points: Six fundamental frequencies can be set freely within the range 20 Hz to 10 kHz. The fundamental frequency points can be chosen from 1 to 6, and the less the faster. Test voltage can be set from 0.02 V to 18 V. The upper limit of distortion can be set from 0.2% to 20%. Automatic PASS/FAIL judgment will be performed.

B.   Distortion curve measurement: Distortion curve can be automatically measured within the range f_L to f_H, in step 1/12, 1/24 or 1/48 Oct. Test voltage can be set from 0.02 V to 18 V.

C.   Curve of distortion against SPL: Each of three frequencies chosen in the range from 20 Hz to 10 kHz is fed to loudspeaker under test. The feeding voltage increases from small to large gradually. The SPL and its distortion are then measured and the results are shown as three curves in red, yellow and green. The SPL range is from 100 dB to 140 dB.

For the above three distortion measurement, the test range is from 0.1% to 20%. One of the following harmonic distortion can be selected: 2nd, 3rd, 4th, 5th, 6th, 7th, 2nd and 3rd, 2nd to 4th, 2nd to 5th, and THD.

(8) to (11) Fo, Qe, Qt and Qm : Automatic search of Fo, and displayed digitally. Test range from 13 Hz to 3 kHz with tolerance of +/- 1% , Resolution: 0.1 Hz. Qm, Qe and Qt are calculated automatically, and displayed digitally.

Speed for testing one loudspeaker :

When full automatic test mode is chosen, only 5.9 seconds are required for testing the all 11 item (listed below), including the display of all measured results and the judgment of PASS/FAIL (1/12 Oct, 20 Hz to 20 kHz). Note: 5.9 seconds is only a typical value, in fact, its test speed is related to the Fo value of the under testing loudspeaker and the tested width band.  

Automatically and continuously testing: (1) Frequency response; (2) Sound pressure sensitivity at 1 kHz (1 kHz can be changed); (3) Average sensitivity of sound pressure within a frequency range; (4) Fo; (5) Polarity; (6) DC  Resistance (DCR); (7) AC Impedance (ACZ); (8) Qm; (9) Qe; (10) Qt; (11) Automatic judgment of PASS/FAIL of above items 1 to 7.