TEKTRONIX DA4084 needs special frame?

Zero Cool

Member
Paid Member
2004-09-20 6:10 am
MN
Someone was telling me that because the TEKTRONIX DA4084 Distortion analyzer is a special military version that it can only be used with the special frame/rack it comes with. that you cannot put a SG505 signal generator in the same rack with it like you can do with the AA501 distortion analyzer.

Anyone familiar with the Tektronix distortion generators and the TM mainframe system enough to know what he is talking about??
 
The mainframe supplied with the DA4084 is a crippled TM5003. It's missing the connector and components to allow another module to be plugged into the left hand slot.

You can either add the missing components to the DA4084 mainframe or get a standard TM5003/5006 mainfame with all slots enabled.

The DA4084 is a modified AA5001, a TM5000 series instrument controllable by GPIB. TM5000 series modules will only fit TM5000 mainframes.

The SG505 and AA501 are TM500 instruments with no GPIB. These will fit both TM500 and TM5000 mainframes.
 
the DA4084 has a SINAD test in place of IMD. SINAD is for testing RF receivers. Get an AA5001 instead or an AA501(A) for audio. Don't forget a low-distortion osc, too. The best is the SG5010 if you can find one.

While I agree that the AA501(A)/AA5001 is the more desireable analyzer, the DA4084 has the advantage of lower cost. For measurement of THD+N, noise, gain and level the DA4084 is every bit as competent as the others. I leave measurement of IMD to the spec-an.

Because of the low cost, I have modified several units to perform 20KHz audio bandpass and quasi peak noise measurements without fear of ruining an expensive instrument. I've also experimented with replacement of the input stage components to further reduce the noise floor.

It's also possible to run the DA4084 in certain TM500 mainframes by removal of a back-plane connector key. This avoids the switching noise created by the power supplies in TM5000 series mainframes.

The SG5010 is definitely a great piece feature wise, but the performance edge goes to the SG505 which has fewer output artifacts.
 
Hello Zero Cool

The DA-4084 is a special distortion analyzer that was meant to tune radio receivers both for the military and commercial applications using the SINAD function, which replaced the IM distortion function on the AA-5001 analyzer.

My test setup uses the DA-4084 and the SG-505 (a very low distortion oscillator), housed in a TM-5006 rack along with two DM-501A meters (for stereo) and a FC-5009 counter. I never got the chance to test all of the functions on the DA-4084 nor was I ever able to connect a GPIB (IEEE488) computer to the DA-4084, who has such a computer now-a-days? However the manual and auto-tuning functions of the analyzer seem to work perfectly, I am always most impressed with this machine’s capabilities. I have over 40 years experience working with almost all the analyzers made (Bruel & Kjaer, Radford, Audio Precision, HP, Crown, etc) and I can say that the DA-4084 can sit among the best of the list.

One thing to note about the TM-5006 mainframe is that some of the plug-in positions are reserved for high power applications (scope, power supply, etc), however this slot can still be used for the DA-4084 without issues. Because the DA-4084 has a second rear card-edge connector, you cannot place this analyzer into a TM500 series rack, it has to be a TM5000 series.

When I originally purchased the unit it came housed in “a crippled TM-5003 cabinet” to quote Murry, and I had no trouble plugging the DA-4084 into my TM-5006 rack. I would have liked to have modified the TM-5003 rack so that it could have also housed the SG-505 oscillator, but unfortunately I could not find the proper connector to populate the back-plane.

Does anyone know where I could find a connector so that I can heal my crippled TM5003? And what (low cost) GPIB computer would be suitable for the TM-5006 / DA-4084 / FC-5009?

Philip
 
... And what (low cost) GPIB computer would be suitable for the TM-5006 / DA-4084 / FC-5009?

Search for a National Instruments NI-488 PCI card. Like this. You'll need the GPIB drivers for it for windows or use the open source drivers on Linux. Software that can talk to it could be something low-level such as this TCL extension and from there you script the communication or build stuff in LabView or LabWindows/CVI. There's probably Perl or Python extensions as well.

Don't kill yourself with those ancient GPIB computers, please.
 
It's also possible to run the DA4084 in certain TM500 mainframes by removal of a back-plane connector key. This avoids the switching noise created by the power supplies in TM5000 series mainframes.

Actually, I've found the 5000 frames to very quiet with regards to switching noise as Tek used the more expensive saturation design. Don't forget to also remove the whole GPIB/CPU board, too, as the GPIB edge connector will probably contact parts mounted on the 500 series backplane. I doubt that is possible.

Also beware of heat dissipation by the 5V regulator on the far right PCB inside the analyzer. The 8V supply on 5000 series frames is regulated, but not on 500 series ones, so it'll probably make more heat and there's not much forgiving with that one regulator as its running near the top of its dissipation already. Take a look.. its a heater.

I don't think its possible to put a DA4084 module in any standard 500 series frames.
 

Zero Cool

Member
Paid Member
2004-09-20 6:10 am
MN
I use a AA501 at work and really fell in love with it. so easy to use. I have two Sg505's at work also one is the WR option. I hope to duplicate the setup in my shop.

I don't need the sinad obviously or the imd functions. I am mainly interested in the THD+N, noise, gain and level measurements. I just sold my HP339A but i need to save a few more pennies to be able to swing this.
 
Hey all

I recently acquired an aa 501a distortion analyzer,
It doesn't have any options ie: IM function etc.
How important is this function for audio repair/alignment

Also my only signal source is a fg 503. Can't find a sg505 in a decent price range.
Do I really need a sg 505 for audio repair?
The 503 has about a .3% distortion rating.
Is this going to be a problem for audio repair work?
 
Hello Zero Cool

The DA-4084 is a special distortion analyzer that was meant to tune radio receivers both for the military and commercial applications using the SINAD function, which replaced the IM distortion function on the AA-5001 analyzer.

My test setup uses the DA-4084 and the SG-505 (a very low distortion oscillator), housed in a TM-5006 rack along with two DM-501A meters (for stereo) and a FC-5009 counter. I never got the chance to test all of the functions on the DA-4084 nor was I ever able to connect a GPIB (IEEE488) computer to the DA-4084, who has such a computer now-a-days? However the manual and auto-tuning functions of the analyzer seem to work perfectly, I am always most impressed with this machine’s capabilities. I have over 40 years experience working with almost all the analyzers made (Bruel & Kjaer, Radford, Audio Precision, HP, Crown, etc) and I can say that the DA-4084 can sit among the best of the list.

One thing to note about the TM-5006 mainframe is that some of the plug-in positions are reserved for high power applications (scope, power supply, etc), however this slot can still be used for the DA-4084 without issues. Because the DA-4084 has a second rear card-edge connector, you cannot place this analyzer into a TM500 series rack, it has to be a TM5000 series.

When I originally purchased the unit it came housed in “a crippled TM-5003 cabinet” to quote Murry, and I had no trouble plugging the DA-4084 into my TM-5006 rack. I would have liked to have modified the TM-5003 rack so that it could have also housed the SG-505 oscillator, but unfortunately I could not find the proper connector to populate the back-plane.

Does anyone know where I could find a connector so that I can heal my crippled TM5003? And what (low cost) GPIB computer would be suitable for the TM-5006 / DA-4084 / FC-5009?

Philip

You can run any GPIB instrument from USB using the $ 150 Prologix adapter:
GPIB-USB turns any computer with a USB port into a GPIB controller || Prologix, LLC
Works like a charm. There's free software like Ulricht Bangert's EZGPIB:
EZGPIB and Prologix GPIB Adapter
that gets you up and running fast.

jan didden
 
My set up is TM5006 + AA5001 + FG5010. I also have Stanford Research lock in amplifier that has super quiet and very low distorsion tone generator that goes up to 100 KHz that I use for distorsion measurement. I have been trying to catch SG5010 but they keep high price on eBay. I will try for the first time to connect my instruments over HPIB/GPIB to my computer. Do you guys have, or you could point me to the right direction where to find, set of comands or program for various measurements on AA5001 that are done over the HPIB/GPIB? Great info on SG505 as well as for Prologix USB adapter!
Thank you
 
My set up is TM5006 + AA5001 + FG5010. I also have Stanford Research lock in amplifier that has super quiet and very low distorsion tone generator that goes up to 100 KHz that I use for distorsion measurement. I have been trying to catch SG5010 but they keep high price on eBay. I will try for the first time to connect my instruments over HPIB/GPIB to my computer. Do you guys have, or you could point me to the right direction where to find, set of comands or program for various measurements on AA5001 that are done over the HPIB/GPIB? Great info on SG505 as well as for Prologix USB adapter!
Thank you

Hi Vlad,

I think you need to check the manual for the specific commands (they are all ASCII strings).
Ulrich Bangert's software shows how to set up any measurement script through the Prologix adapter using his EZGPIB software which really isn't that difficult. You typically type the commands in a window and then let them execute.

jan didden
 
Slightly Oy, anyone here heard of a 3M 6110 Distortion Analyzer?

I have 2 DA-4084's and have also used the AA501, all great units. all are FAR easier and more accurate than my previous 334A. for real design work, we now use a stanford research SR-1, great unit, but >$7K

I happened onto a strange digital distortion analyzer made by of all people, 3M (yes, the scotch tape guys). I have a buddy that could really use it for tube amps if I could get it running.

however, my web search has been hopelessly bad for a manual, this one has all kinds of instability issues, so I feel a manual is the only way I can get this oscillator and the rest of it to run properly. it has both a low dist. source, and an analyzer and counter all in one box. would be a very neat unit if I could get it running.

all help gratefully accepted.
walter
sphere research corp. (just google it to find me)