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GB for RTX6001 Audio Analyzer with AK5394A and AK4490

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JensH

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Joined 2009
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@NicMac

You can probably eliminate a large part of the junk by using a different cable, e.g. something like figure 17 in this note:

Sound System Interconnection

Just remember to connect the chassis of the two units together to avoid large common mode signals.
Pin 1 of the RTX6001 inputs are connected to the chassis, they are not analog ground connections. So it is preferable to use the inputs as differential inputs, even if the source is single ended.
 
NicMac

NicMac

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Jazid said:
Its my role (yet again) to ask the dumb question: what software are you using here? Its screen shots makes it appear much more informative than either ARTA or Audio Tester...not that I am much versed in either.
Click to expand...
The software is called Room EQ Wizard (REW) and you can find it here.
I'm using it here exactly for the reason you mention: (almost) all settings are visible in the screen shots, making it useful for RTX6001 owners to compare experiences without having to ask to many questions:)
At this point it seems more important to be able to compare our experiences on a single (free) software platform, rather than to discuss the benefits/defects of different softwares.
Just my 2c.
 
cwtim01

cwtim01

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Joined 2012
nyt said:
The lowest I can get is about 0.00005. How are you disabling the other channel?
Click to expand...

It's required only in software where they use both channels (e.g. Audio Tester), ARTA and REW use only one channel by default so no special action is required.

BTW, attached is a measurement of a single-ended Viktor 1k oscillator using the RTX. The Viktor is crippled with a 30V smps (battery based DC-DC converter) when it needs 35-36V, so it's not giving it's full performance but the limiting factor here is the ADC I believe. (When pairing with a Hall notch filter with 4x9V battery, my Viktor was verified to have an H2 of <-150dB before).
 

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soongsc

soongsc

Member
Joined 2005
JensH said:
@NicMac



You can probably eliminate a large part of the junk by using a different cable, e.g. something like figure 17 in this note:



Sound System Interconnection



Just remember to connect the chassis of the two units together to avoid large common mode signals.

Pin 1 of the RTX6001 inputs are connected to the chassis, they are not analog ground connections. So it is preferable to use the inputs as differential inputs, even if the source is single ended.
Click to expand...

I was also interested in how the loop back interconnects effect the results.
 
A

AndrewT

R.I.P.
Joined 2004
NicMac said:
I did a few measurements to compare the use of balanced and single ended interconnections between the RTX and Victor generators, and the RTX detector. The measurements were taken first with balanced interconnects and then with single ended, without changing anything else.

The first two are using the RTX generator (i.e. loop-back) and the second two with the Victor.

Balanced is more pleasing to the eye, even if the actual THD and THD+N measures do not change dramatically.
Nevertheless, I seem to have quite a lot of common mode junk around here....
Click to expand...
post639
are the four pics on order from left to right? :
balanced RTX - single ended RTX - balanced Victor - single ended Victor

where single ended is the BNC socket and cables.
 
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K

kannan_s

Member
Joined 2009
Just test feeding 10 V from the generator in to Analog input on RTX 10 V input( loop back) you should see large number of spikes ( nyt posted earlier) in harmonics. This is without opening. But what we understand that you should have updated one as the second shipment took care of mods.
 
N

nyt

Member
Joined 2010
kannan_s said:
Just test feeding 10 V from the generator in to Analog input on RTX 10 V input( loop back) you should see large number of spikes ( nyt posted earlier) in harmonics. This is without opening. But what we understand that you should have updated one as the second shipment took care of mods.
Click to expand...

The generator doesn't output enough voltage per leg to trigger the problem afaik.
 
NicMac

NicMac

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AndrewT said:
post639
are the four pics on order from left to right? :
balanced RTX - single ended RTX - balanced Victor - single ended Victor where single ended is the BNC socket and cables.
Click to expand...

Yes - that is the order.
The RTX only has XLR input sockets so I used a BNC/XLR adapter cable for the SE measurements. However, as others have commented, and as demonstrated by Tim in post #646, much better measurements can be achieved single ended.
I guess I need to improve my cabeling:eek:
 
TNT

TNT

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Joined 2003
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cwtim01 said:
It's required only in software where they use both channels (e.g. Audio Tester), ARTA and REW use only one channel by default so no special action is required.

BTW, attached is a measurement of a single-ended Viktor 1k oscillator using the RTX. The Viktor is crippled with a 30V smps (battery based DC-DC converter) when it needs 35-36V, so it's not giving it's full performance but the limiting factor here is the ADC I believe. (When pairing with a Hall notch filter with 4x9V battery, my Viktor was verified to have an H2 of <-150dB before).
Click to expand...

May I ask which smps dc-dc converter that is?

//
 
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