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Getting Distortion Down

Posted 1st February 2017 at 08:59 AM by SyncTronX
Updated 1st February 2017 at 07:25 PM by SyncTronX

Over in the Low-distrotion, Audio-range,
Oscillator thread (LINK) some posts
about getting lower distortion before taking
the measurement of a DUT (Device Under Test).

Our own RNMarsh posted some good results
running his Panasonic through a miniDSP
box configured as a Low Pass Filter.

He had good results. So I thought and told him
so, and suggested he might get better results doing a band pass filter.

So instead of doing my diode homework for
my Solid State Devices class, I thought I'd
better check, that is put up for shut up.

So, I did and here is what I discovered:

Before filtering:
Click the image to open in full size.

http://www.diyaudio.com/forums/attac...r-baseline.jpg...
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Old

How to Spell Checking Posts - Firefox

Posted 27th December 2016 at 04:12 AM by SyncTronX
Updated 31st December 2016 at 05:26 AM by SyncTronX

How to set up the spell checker.

Surprise!

Spell check is NOT in the DIYAudio software,
it is part of your browser.

Set up is simple. Follow these
general steps:

On the menu bar select and hold tools:
Click the image to open in full size.


Then, drag down and selection Options:
Click the image to open in full size.






Then from the tool options scroll down and select Advanced:
Click the image to open in full size.



Then at the bottom click on the check box, to
put a check in it:

Click the image to open in full size.


Close the window, restart your browser, that is it.
...
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Old

HP 339A Mods & Upgrades

Posted 29th November 2016 at 01:42 AM by SyncTronX
Updated 1st February 2017 at 09:27 AM by SyncTronX

HP339a
Introduction


The HP339a was a state of the art (SOTA) distortion analyzer in the 1980s.
It is a full featured all-in-one product including a volt meter,
low-distortion oscillator, distortion analyzer, AM detector, and VU meter.

There was an in-depth analysis of low distortion oscillators
on DIYAudio on the following link:


<Low-disortion Audio-range Oscillator>
This was followed by a specific HP339a thread, linked here:

<HP339a>

This is a summary of those threads along with the links, conversations, and
posts, about the research and development that went into the suggested modifications to the venerable HP 339A.

Outline



Why HP 339A?

HP339A Post #78
Well, a stock 339A gives you a wide band ac voltmeter, an oscillator and analyzer. A stock one will do you pretty well as long as you have no interest in reading below...
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Old
Rating: 3 votes, 4.67 average.

Using the QA400 Tips

Posted 18th December 2014 at 05:38 AM by SyncTronX
Updated 21st December 2014 at 08:52 AM by SyncTronX

For those of use that use the QA400 FFT,
here are some tips that will help us use the
product and software for measurement.

Press the Ctrl key plus an Axis, Windowing, or Measurement soft switch parameter.

For example, PRESS Ctrl + .dBV brings up a
dialog box to set External Gain & Peak Display Format:
Click the image to open in full size.

Ctrl + .dBr brings up the following:
Click the image to open in full size.



Ctrl + .X Lin:
Click the image to open in full size.



Ctrl + .X Log:
Click the image to open in full size.


The Measurements soft switch parameters as follows:

Ctrl + .Pwr:

Click the image to open in full size....
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Old

Keyboard Short Cuts: Copy, Paste, Cut/Delete, Undo

Posted 30th July 2014 at 07:00 AM by SyncTronX
Updated 30th July 2014 at 07:06 AM by SyncTronX

There are some simple keyboard short cuts
that have been around for a while and work.

You may already know them some of us might
not. They were originally used in the Apple
Computer interface and have been held over
on the windows computer too.

After you select an item by clicking it
or clicking and dragging, then do
one of the following: Undo, Cut, Copy, Paste.

The actions are performed with the keyboard keys,
the lower left side and above the space bar.

The keys are Z X C V .

Use one of these keys with the Ctrl key.

Ctrl + C Copy
Ctrl + V Paste
Ctrl + X Delete
Ctrl + Z Undo

The Ctrl key is located in the lower left corner
of the keyboard.

Use the rolling press to make this work.

First press Ctrl with the little finger, left hand,
hold it down,
then press C key with middle finger,...
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Old

Screen Capture

Posted 23rd March 2014 at 05:24 AM by SyncTronX
Updated 20th March 2016 at 01:34 AM by SyncTronX (spell check and clarify)

Here is one method to capture your computer measurements
from your computer screen.

To capture only a window that is selected:

Press ALT and Print Screen
keys at the same time.

OR

To capture the whole computer screen image:
Press the Print Screen key.

Then open your paint program and paste
the capture:

Press CTRL and V keys.

Your window/screen is now in your paint program.
Save it in a JPEG format.

Note, the generic paint program is listed
under the Start Menu:All Programs:Accessories:Paint

When saving, look and see where Windows
puts the file...it can get real tricky to find again.

IMG or BMG files are huge.
JPG (Joint Photographic Expert Group)
has algorithms that compress the file size
down to make it easier to send and receive.

Here is my screen capture:

http://origin.dastatic.com/forums/ga...rintScreen.jpg
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