Amplifier Measurement Techniques

YUTK · 17th May 2006, 01:25 PM

How I can test Balance input impedance if any one know pls tell me

EchoWars · 18th May 2006, 03:46 AM

I'm not sure I (or anyone else here) understands the question...?

ApD · 19th May 2006, 12:33 AM

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...

17th May 2006, 01:25 PM	#1
YUTK diyAudio Member Join Date: Jan 2005 Location: BANKKOK	Amplifier Measurement Techniques How I can test Balance input impedance if any one know pls tell me

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18th May 2006, 03:46 AM	#2
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	I'm not sure I (or anyone else here) understands the question...?

19th May 2006, 12:33 AM	#3
ApD diyAudio Member Join Date: May 2006	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...