Summary of Contents for Space Tech Easy Audio Tester
- Page 1 User Manual Model : Easy Audio Tester EAT-100 DSP based universal audiophile equipment tester (can perform tube matching) Version 1.2...
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Page 2: Product Description
www.space-tech-lab.com Product description: This is a private technical assistance with Digital Signal Processor (DSP). An integration of several powerful automatic measuring instrument which cost $10K or over in one compact chassis (FFT spectrum analyser, Digital signal generator, Digital CRO, Harmonic Distortion Analyser, Gain tester and Frequency response tester) , This automatic tester can help audiophile , DIYer and technicians to perform professional testing even without technical know how. -
Page 3: Basic Operations
www.space-tech-lab.com 15. matching of vacuum tubes Basic operations: There are 6 different modes of testing can perform on the above mentioned equipments. Input, output and control keys layout for different version... -
Page 4: Frequency Response Test
www.space-tech-lab.com Frequency Response Test This is the most important parameter for all audiophile quality equipment. Typical human ear can hear from 20Hz to 20Khz of frequency range, which means an audio equipment with reasonable performance, should at least be able to regenerate this range of frequency or even wider, with more or less the same level relative to each others (+/- 1db typical, +/- 3db max.) This tester equipped with a high precision digital synthesis signal generator. - Page 5 www.space-tech-lab.com You will be able to observe a frequency response curve as follow, and the tester will tell you the highest -3db point frequency of the DUT. If the highest -3db point is higher than 100Khz, then it will simply shows “-3db > 100Khz”.
- Page 6 www.space-tech-lab.com Gain Test This is another most important test for all audiophile quality equipment. It can test whether the DUT has equal gain for L and R channel, or to match the gain of vacuum tubes (use the same channel for test base, and replace with different tubes then record the reading of their gains, provided that the device for tube testing is non-feedback design in order to show the real gain of the tubes).
- Page 7 www.space-tech-lab.com THD (Total harmonic distortion) Test This is an important test parameter to show whether the DUT is in healthy condition or something wrong with it. The tester will output a very low distortion 1Khz sine wave as reference signal, then by measure the output signal from the DUT, the tester can calculate the harmonic distortion generated and display in %, and show the harmonics distortion pattern at the same time.
- Page 8 www.space-tech-lab.com 4. Press 'SELECT' to proceed and view the test result. The following is an example of heavily distorted output from DUT with lots of odd harmonics. Below is a perfect non-distorted output from DUT...
- Page 9 www.space-tech-lab.com SIG GEN (Signal Generator) This mode can set the output signal of the tester to either “sine”, “triangle” or “square” waves, with frequency range from 10Hz to 100Khz of your choice. This signal will output to both the XLR and RCA output of this tester, and can be fully controlled by the output level control knob on the right hand side.
- Page 10 www.space-tech-lab.com CRO (Digital oscilloscope) This mode can monitor the input signal as a digital oscilloscope, you can connect the output signal from this tester to the input of the DUT, and use this mode to check the output signal from it. When the signal from DUT is connected to the 'speaker level' input, the CRO can automatic calculate the measured value of the signal and display in “Watt”.
- Page 11 www.space-tech-lab.com FFT (Fast Fourier Transformer – Spectrum analyser) This mode is a very powerful test mode for real time display of a spectrum of frequency from 10Hz to 28Khz. With the “white noise” CD / file come with this tester, you can test the real time frequency response of a CD player, DAC and music server.
- Page 12 www.space-tech-lab.com Press “SELECT” during testing will quit back to main manual.
- Page 13 www.space-tech-lab.com Appendix A : Connect different device for testing For pre-amp, phono amp, buffer amp, equalizer, connect as follow, and set input selector of the tester to 'line level': For power amp or integrated amp connect as follow, set input selector of the tester to 'speaker level' :...
- Page 14 www.space-tech-lab.com For active speaker or passive speaker system connect as follow, an optional mic pre-amp is needed, and set input selector of the tester to 'line level' : For tube testing with optional Tube-test add-on module...
- Page 15 www.space-tech-lab.com Disclaimer: In no event shall our company be liable for any direct, indirect, punitive, incidental, special consequential damages, to property or life, whatsoever arising out of or connected with the use or misuse of our products Warranty : One year free parts and labor warranty apply under normal operation condition , physical damage or normal wear out will not covered.
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