Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

DIY Audio Analyzer with AK5397/AK5394A and AK4490
DIY Audio Analyzer with AK5397/AK5394A and AK4490
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 12th February 2018, 10:55 PM   #1871
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Default RTX6001 Manual Ranging

RTX6001 Manual Ranging (for audio Tester V3)

For those that want real world volts or dBV values that scale to real world Vrms.

Select the input switch position with full scale Volts nearest to but larger than your DUT output voltage. Go into the options selection “calibration” and input and enter the full scale volts in millivolts and enter. The FFT will be scaled in real world volts.

For switch position 1; full scale input equals 100Vrms = 100000mv
For switch position 2; full scale input equals 31.6Vrms = 31600mv
For switch position 3; full scale input equals 10Vrms = 10000mv
For switch position 4; full scale input equals 3.16Vrms = 3160mv
For switch position 5; full scale input equals 1.00Vrms = 1000mv
For switch position 6; full scale input equals 0.316Vrms = 316mv
For switch position 7; full scale input equals 0.100Vrms = 1000mv

To set the generator output voltage you need to calculate the dBFS value to enter in the output setting menu.

The maximum output voltage for Switch

#1 = 100mv
#2 = 1V
#3 =10V

For switch position number 1; dBFS = 20 * Log(Desired volts) + 20 . Switch #1 max Volts = 0.1 .
For switch position number 2; dBFS = 20 * Log(Desired volts) . Switch #2 max Volts = 1 .
For switch position number 3; dBFS = 20 * Log(Desired volts) - 20. Switch #3 max Volts = 10 .

DT

Last edited by DualTriode; 12th February 2018 at 10:59 PM.
  Reply With Quote
Old 13th February 2018, 12:32 AM   #1872
soongsc is offline soongsc  Taiwan
diyAudio Member
 
soongsc's Avatar
 
Join Date: Mar 2005
Location: Taiwan
0.1vrms would be 100mv
__________________
Hear the real thing!
  Reply With Quote
Old 13th February 2018, 02:15 AM   #1873
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Quote:
Originally Posted by soongsc View Post
0.1vrms would be 100mv
Thank you, you are so correct.

For switch position 7; full scale input equals 0.100Vrms = 100mv

I perseverated on the keyboard.

DT
  Reply With Quote
Old 13th February 2018, 07:52 AM   #1874
mbrennwa is offline mbrennwa  Switzerland
diyAudio Member
 
mbrennwa's Avatar
 
Join Date: Mar 2005
Location: Zurich, Switzerland
Quote:
Originally Posted by DualTriode View Post
The maximum output voltage for Switch

#1 = 100mv
#2 = 1V
#3 =10V
Just to avoid confusion, these are sine-RMS values, NOT maximum voltages. The max would be approx. 141 mv, 1.41 V, and 14.1 V.
__________________
[ audioroot.net | hifibau.ch ]
"You have no clue of how an amplifier works." - AndrewT
  Reply With Quote
Old 13th February 2018, 11:40 AM   #1875
PierreQuiRoule is offline PierreQuiRoule  Canada
diyAudio Member
 
PierreQuiRoule's Avatar
 
Join Date: Feb 2004
Location: Ottawa
DIY Audio Analyzer with AK5397/AK5394A and AK4490
Quote:
Originally Posted by BlacK_Chicken View Post
This evening I finished a first (still a draft) implementation of a auto-ranging behaviour for the input and output attenuators of the RTX6001. [...]
I am working with Mathworks Matlab. Therefore, I am not really sure about the amount of interest people have into these kind of things...
Congratulations! At least one is very interested . Would you mind sharing? I use Mac OS X and unless you do too, will need to build a mex file on a Mac. Maybe this should go to a new thread unless Jens prefers to keep RTX HID-related discussion here? In any case, thanks to Jens, Mat and you!

edit: Since GNU Octane also can build mex files, I suspect your HIDAPI code should be compatible with MATAA.

Last edited by PierreQuiRoule; 13th February 2018 at 11:52 AM.
  Reply With Quote
Old 13th February 2018, 06:06 PM   #1876
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Sacramento
Hello,

I recall seeing an old Popular Mechanics Magazine with a telephone dial on the front cover. I think 1959. The telephone dial was the input device to an early DIY computer. To enter data the numbers needed to be converted to binary zeros and ones. When the computer was finished crunching, the output needed to be converted back into 10 base by the user.

This is much the way I see inputting voltages into the RTX6001. There is room to progress.

One place to start the progression is the RTX6001 Attenuation Control Program.

Looking at the audio Tester user manual, aT V3 uses a .INI file, a Configuration file to handle and keep configuration and calibration information. This .INI file configuration and calibration information is loaded each time audio Tester is booted and can also be updated on the fly while the program is in use.

I can picture new graphic windows in the RTX6001 Attenuation Control Program. There could be a check box for balanced input and another check box for unbalanced input. Then there could be check boxes for input and output selector switch positions. You could directly enter desired output voltages. All the dBFS scaling would happen out of sight and out of mind.

This is all an introverts’ day dream.

DT

Last edited by DualTriode; 13th February 2018 at 06:18 PM.
  Reply With Quote
Old 13th February 2018, 07:44 PM   #1877
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
Quote:
Originally Posted by Ghianni View Post
@ Jens:

On the specification page of the RTX6001 unit there were mentioned figures of THD, THD+N, seen on the attached jpg. I assume that these measurements have been taken using audio-Tester V3. Would you please define the full setup applied to the SW and the unit of receiving these results?
This technical section has measurements at two levels, 0/10dBV at 48K@1KHz but there is no any information about the signal level of gen, the FFT resolution, the Window e.t.c.

With a well pre-warm unit, I could to catch the specification only at 10dBV, 48KHz@1KHz but with -10dBFS signal gen (131K, Kaizer7) with ARTA. Almost 0.000089% at the left or right channel (mono).
This meaning that a level of -121dB has achieved vs -119dB of typical.

I had the same level of -121dB and with 0dBV (the rest same like before), I was -3dB under from the -124dB of typical.
Attached Images
File Type: png 48K left loopback xlr, gen -10dB.png (61.2 KB, 144 views)
  Reply With Quote
Old 13th February 2018, 07:59 PM   #1878
mbrennwa is offline mbrennwa  Switzerland
diyAudio Member
 
mbrennwa's Avatar
 
Join Date: Mar 2005
Location: Zurich, Switzerland
Quote:
Originally Posted by DualTriode View Post
I can picture new graphic windows in the RTX6001 Attenuation Control Program. There could be a check box for balanced input and another check box for unbalanced input. Then there could be check boxes for input and output selector switch positions. You could directly enter desired output voltages. All the dBFS scaling would happen out of sight and out of mind.
I don't know audioTester, but what you describe is already possible with MATAA. While there are no pretty windows and checkboxes, the user can specifiy the signal voltage and a calibration file (that corresponds to the current level settings) for each measurement. I am sure similar things are possible with other software, too.

Quote:
Originally Posted by PierreQuiRoule View Post
Congratulations! At least one is very interested . Would you mind sharing? I use Mac OS X and unless you do too, will need to build a mex file on a Mac. Maybe this should go to a new thread unless Jens prefers to keep RTX HID-related discussion here? In any case, thanks to Jens, Mat and you!

edit: Since GNU Octane also can build mex files, I suspect your HIDAPI code should be compatible with MATAA.
If I am going to add functionality to control the RTX level switches from within MATAA, I want it to work on Mac, Windows and Linux, and on both Octave and Matlab. While it might be possible to use Black_Chicken's solution with MATAA on Matlab, it does not work on Octave (Black_Chicken provided some test files for me to try, so I know it does not work on Octave). However, while I do have ideas of how this could be solved, I have to say that the current way of working with predefined calibration files for the different level settings works fine for me, so this is not an urgent issue for me.
__________________
[ audioroot.net | hifibau.ch ]
"You have no clue of how an amplifier works." - AndrewT
  Reply With Quote
Old 14th February 2018, 12:25 PM   #1879
lemon is offline lemon  Greece
diyAudio Member
 
Join Date: Apr 2009
I don't know if I have understood well, but this limitation with calibration at each attenuate position, there isn't on ARTA.
If you calibrate an -3dBFS input signal at one position e.g 0dBV, the signal threshold at the bottom will indicated -3dBFS.
If you continue change the attenuate position e.g to 10dBV, the signal threshold at the bottom will indicated -13dBFS and so on upper or down.

From this, I can conclude that there is no need of calibration to each attenuate position on ARTA but only to one.

Am I right? Is that the talking point about?
  Reply With Quote
Old 14th February 2018, 01:19 PM   #1880
cwtim01 is offline cwtim01  Hong Kong
diyAudio Member
 
cwtim01's Avatar
 
Join Date: Aug 2012
If you only display the vertical scale in dBFS, there is no need to calibrate at all, dBFS is by definition relative.

Calibration is required, when you display the vertical scale in dBV (or dBU, ... etc.), and a different calibration value is required for each attenuate position, or else you'll get wrong values.
  Reply With Quote

Reply


DIY Audio Analyzer with AK5397/AK5394A and AK4490Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
New AKM Stereo ADC AK5397 announced JensH Digital Source 20 24th December 2014 01:05 PM
New AKM Stereo ADC AK5397 ??? HpW Equipment & Tools 6 16th May 2014 05:26 PM
NTi Audio XL2 Handheld Audio Analyzer Fredenando Equipment & Tools 0 18th April 2010 04:04 AM
AKM AK5394a TobWen Digital Source 41 31st December 2003 07:18 PM


New To Site? Need Help?

All times are GMT. The time now is 09:45 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki