Space Tech Easy Audio Tester, EAT-100 User Manual

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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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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. If you are an audiophile but without any in-depth technical knowledge, you have

no choice but need to ask for help from technicians or engineers when your system is down. With this new age

automatic tester on hands, you have no longer needed to pay for expensive diagnostic fees. You can easily

check out the health condition of every audio gears in your system, and also be able to easily sort out any

problematic or degraded unit. You can also check out whether an audio gear as good as it said before paying

for it.

This tester can power up by a DC-12V to 15V power supply( >or = 500mA). You can also power it up with a car

battery from cigarette lighter in the car. So it can be use to perform audio testing almost anywhere, especially

suitable for field test technicians and engineers.

If you are a experienced technician or engineer with great skill, you might thing this tester seem too simple.

Yes, you are right, this tester is exactly design for simple and easy to use, and try to make novice perform

testing professionally without the need to spend years in MIT.

This automatic tester can test but not limit to the following items:

1. Phono stage (MC and MM)

2. Pre-amplifier

3. power amplifier

4. integrated amplifier

5. buffer amplifier

6. Cd player

7. DAC

8. music server

9. equalizer

10. active crossover

11. passive speaker crossover

12. active speaker system

13. passive speaker system

14. interconnects and power cables

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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

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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. It will

automatically sweep from 10Hz to 100Khz with equal output level as test signal, and by

connect this test signal to the “device under test” (DUT), by measure the output of the

DUT, we can found out the frequency response of the device. This is one of the key factor

to judge the health condition of an audio gear.

Here is the test procedure:

1. Connect DUT according to “Appendix A”

2. Select “FREQ RESP” by press the 'FUNCTION' key until it high-lighted. Then

press 'SELECT' to proceed to the following screen

3. Set the tester signal output to maximum level (this is very important for

response test, fail to do so will lead to early roll-off of high frequency).

4. Turn on the DUT and wait for it to be ready.

5. Set the output level of the DUT to around 800-1000mV.

6. press 'SELECT' to proceed the automatic testing process.

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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”.