Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

RE: If the sine wave isn't pretty???

Posted by gusser on March 14, 2017 at 12:47:12:
A meter will tend to average out all that noise. I would trust the scope over any meter.
You also have to be careful and not introduce a ground loop via your test equipment - especially on something like a phono stage with it's low signal levels and high gain.
For example is does your scope have a three wire power cord? The scope electrical ground can easily carry noise into the system under test and corrupt the measurement. This is one of those cases where it's often necessary to lift he scope safety ground just for a test. Ideally in that case the scope should be operated through a 120v/120v isolation transformer