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Old 17th May 2006, 01:25 PM   #1
YUTK is offline YUTK  Thailand
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Default Amplifier Measurement Techniques

How I can test Balance input impedance if any one know pls tell me
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Old 18th May 2006, 03:46 AM   #2
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I'm not sure I (or anyone else here) understands the question...?
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Old 19th May 2006, 12:33 AM   #3
ApD is offline ApD
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Technically speaking, you probably won't need to measure it directly. An examination of the input circuit might do instead.

- If it is any of the 'classic' designs, as in one of the listed examples, you may calculate it directly. Take a look at:
http://www.dself.dsl.pipex.com/ampin...d/balanced.htm

- If you insist on measuring it, with an ac-capable DMM of good quality, connect two equal value resistors in series with each input lead and measure the ac voltage before and after the resistors. Ohm's law will do the rest. Take note, that most DMM's are quite inaccurate beyond 1kHz. You may want to use a 'scope for *better* results...
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