Go Back   Home > Forums > >

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
Old 20th December 2020, 12:16 AM   #3041
1audio is offline 1audio  United States
diyAudio Member
 
Join Date: Mar 2004
Location: SF Bay Area
DIY Audio Analyzer with AK5397/AK5394A and AK4490
Quote:
Originally Posted by zfe View Post
For measuring electrostatic headphone amps I would like to increase the input attenuation.
Would it be good practice to add a, say, 900k resistor in series to the single ended input? This would make a 10:1 divider with the 100k input impedance of the RTX6001. A hight input impedance is desired for electrostatic amps anyway.
For most electrostatic headphones (Stax or similar) you will need a differential measurement. 1 Meg is a significant load and you need more like 10M or even 100 M. And you need to compensate the capacitance. Fortunately the voltage swing is on the order of 200V or more so a divide by 100 probe is not an issue and the RTX has enough gain. Stray capacitance at the probe point is also an issue since the headphones are on the order of 100pF and the stray can be significant. Also use several resistors in series to reduce the voltage and associated voltage coefficients across them.

Keep in mind 200V at 20 KHz can pack quite the punch even with limited current.
__________________
Demian Martin
Product Design Services
  Reply With Quote
Old 20th December 2020, 03:08 PM   #3042
zfe is offline zfe
diyAudio Member
 
Join Date: Dec 2014
My idea was to measure without headphone connected and add some capacitance in parallel so simulate the headphone. This way the stray capacitance and the input capacitance of the RTX6001 could be part of that capacitive load. Are there objection on doing so?
  Reply With Quote
Old 20th December 2020, 04:28 PM   #3043
JensH is offline JensH  Denmark
diyAudio Member
 
Join Date: Jul 2009
DIY Audio Analyzer with AK5397/AK5394A and AK4490
The capacitance of the headphones is in the order of 100 pF, equivalent to an impedance of 160 kohm at 10 kHz, so I don't think that a balanced load impedance of 2 Mohm will be a problem.

I built a KGSS amplifier some years ago. It has output resistors of 5k11 in series with each output.
  Reply With Quote
Old 17th January 2021, 10:05 PM   #3044
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Nor Cal
Default Shielding installation instructions?

Hello All,

Looking for help with the installation of the shielding kit for the RTX6001 that was mailed to me.

Inside the box with the analyzer I have had the unopened envelope with the shielding inside. Are the shielding installation instructions posted here anywhere?

Thanks DT
  Reply With Quote
Old 17th January 2021, 10:12 PM   #3045
diyaudnut is offline diyaudnut  United States
diyAudio Member
 
Join Date: Feb 2015
Check the first page of this thread. Jens has placed links to all the mod descriptions.
  Reply With Quote
Old 17th January 2021, 10:58 PM   #3046
DualTriode is offline DualTriode  United States
diyAudio Member
 
Join Date: Aug 2009
Location: Nor Cal
Thanks I have got it now.
  Reply With Quote
Old 24th January 2021, 04:45 PM   #3047
popeman is offline popeman
diyAudio Member
 
Join Date: Jan 2016
Please excuse my ignorance but it's almost impossible for me to read all 305 pages at the moment.

I've been looking in getting an audio analyzer and I'd like to ask if this is a product/project that I can still purchase and if so, where can I find more information like price,where to buy, etc...

Many thanks!
  Reply With Quote
Old 26th January 2021, 07:38 AM   #3048
JensH is offline JensH  Denmark
diyAudio Member
 
Join Date: Jul 2009
DIY Audio Analyzer with AK5397/AK5394A and AK4490
Unfortunately the RTX6001 has been discontinued. Your best chance of getting one is probably buying one from a member of this forum.
  Reply With Quote
Old 26th January 2021, 08:02 AM   #3049
popeman is offline popeman
diyAudio Member
 
Join Date: Jan 2016
I see. Thank you very much JensH.

BTW, is this product somehow related?

RTX6001 Audio Analyzer with Multi-Instrument Full Package | Virtins Technology

Seems still available.
  Reply With Quote
Old 26th January 2021, 08:09 AM   #3050
jan.didden is offline jan.didden  Europe
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Westende Resort, BE coast
It is the same, but try to order it ;-)

Jan
  Reply With Quote

Reply


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

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 02:32 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki