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SUNLIGHT AUDIO SWEEPER 7116C Loudspeaker Polarity Tester 139B NOISE GENERATOR 8121C GAUSS METER 138 IMPEDANCE METER 152A DIGITAL HIGH-SPEED Fo METER 7117 C.
Model 7117C has the following two main functions: A.Model-7117C can measure the Fo value of a loudspeaker fully automatically, with no need for manual adjustment of the instrument. The correct Fo value of a loudspeaker is displayed on the DISPLAY PANELã??( 14 ) in just 1 to 1.5 seconds. It has many advantages to using a voltmeter with a needle indicator for measuring the Fo value of a loudspeaker: ( a ) Easy to read; ( b ) No visual error; ( c ) High accuracy. B. Model-7117C can be used in a production line: high speed judging if the Fo value of every loudspeaker is within the qualified range, Judging speed is as fast as in just 0.3 to 0.7 seconds, the â?? PASS / FAIL Testâ?? functions will be indicated instantly. Technical specificationï¼? A. Display: Displayed in 3 �¾digits. B. Accuracy: Fo readout error less than �± ( 1% + 1Hz ) C. Measuring Range: 4 ranges from 16Hz to 3KHz, ( a ) 16Hz - 80Hz ; ( b ) 54Hz - 270Hz. ( c ) 180Hz - 900Hz ; ( d ) 600Hz - 3KHz. D. Fo measuring voltage added on the pre-measure loudspeaker: 1V r.m.s. �± 10%( complies with EIA standard ). E. Can test the impedance of an under-testing loudspeaker: Divided into two ranges, which are (1) 3�© to 18�©; (2) 19�©to 100�©. F. Measuring Speed: ã?? Fo Readout ã??in 1 to 1.5 seconds. ã??PASS / FAIL Testã??in 0.3 to 0.7 seconds. G. Limit Setting: Both the upper & lower limits of a loudspeaker can be preset independently from 16Hz to 3KHz, and have no interference with each other. H. Limitation in usage: Model-7117C can not be used to measure the Fo value of an air suspension loudspeaker, including those loudspeakers which are air-tight frames, since their Q.o. values are too low to measure. SUNLIGHT AUDIO SWEEPER 7116C Loudspeaker Polarity Tester 139B NOISE GENERATOR 8121C GAUSS METER 138 IMPEDANCE METER 152A DIGITAL HIGH-SPEED Fo METER 7117 C.
the weighting filter 8121FT-1 (IEC-268-1) 1 8121FT-1 is the weighting filter made by IEC-268-1 requirement, it must linked with either Model-8121C, to enable it to generate a weighting noise filter that complies with IEC-268-1 requirements, for undergoing the life testing of the loudspeaker and defining the rated power of the loudspeaker 2 When using please take note that: The input signal adopts the Pink Noise, and not other signal of noise sources. 3 Furthermore, the noise generated from this weighting filter also complies with the filter noise required by the JIS C5532. SUNLIGHT AUDIO SWEEPER 7116C Loudspeaker Polarity Tester 139B NOISE GENERATOR 8121C GAUSS METER 138 IMPEDANCE METER 152A DIGITAL HIGH-SPEED Fo METER 7117 C.
Model-8121C uses a logic circuit to generate Pseudo Random Noise, it is the newest and the most advanced design to generate audio white noise. It has a much flatter frequency response than using a diode. Model-8121C has: (1)White noise source. (2)Weighting filters. (3)Built-in power amplifier. (4) TRUE RMS voltage meter circuit. It can generate five different kinds of the noise spectrum, including White Noise, Pink Noise, and three kinds of Weighted Noise, that conform to the following nations standards:(1) JIS C5531, IEEE 219, CNS 4785 (2) EIA 426B(3) DIN 45573 1. White Noise: -3dB Bandwidth: 20Hzï½?100kHz, Roll off:-24dB / Oct. Flatness: �±1dB 2. Pink Noise: -3dB Bandwidth: 20Hzï½?20 kHz Roll-off: -24dB / Oct. Crest factor: 4 ( IEEE 219 ) Amplifier: 1.100W output is defined at an unclipped maximum output of sine wave. 2.Frequency response : 20 Hz~20 kHz ±0.2dB; 20 kHz~100kHz ±1dB 3. Output: With permanent short circuit protection. Load Impedance:
Even in a very noisy environment, Model-139B still has the ability to determine quickly and precisely the positive and negative polarity of a loudspeaker headphone receiver and every single unit in a loudspeaker system. Model-139B also includes 3 sets of external input terminal and selector which can be used to combine with other instruments, in order to measure the other features of a loudspeaker simultaneously. It is quite suitable for 100% Q.C. testing for loudspeakers in the production line. Loudspeaker Polarity Tester 139B Technical specification: (1) Pulse measuring method. (2) Polarity indicator : (a) Green indicator: Positive polarity with beep sound. (b) Red indicator: Negative polarity with no sound at all. (3) Five touch switches : (a) WF range: Suitable for measuring the polarity of the woofer. (b) M & T range: Suitable for measuring the polarity of midrange and tweeter. (c) EXT.1 to EXT.3: Used to select the instrument connected to the external input terminal. (4) Model-139B can be connected with Model-7116C, to measure the buzz, and rattle of a loudspeaker. Only one operator is needed. (5) Measuring distance: 2 to 4 Cm. from the center point. of the dust cover of the pre-measure loudspeaker. (6) Measuring sensor: Uses ECM. (7) Dimension ( m / m ): 85 ( height ) x 205 ( width ) x 280 ( depth ). (8) Weight: 2.3 Kg. SUNLIGHT AUDIO SWEEPER 7116C Loudspeaker Polarity Tester 139B NOISE GENERATOR 8121C GAUSS METER 138 IMPEDANCE METER 152A DIGITAL HIGH-SPEED Fo METER 7117 C.
