NI 9477 DO causing NI 9213 TC noise
On my cRIO-9073 I have basic LabVIEW code accepting NI 9213 thermocouple measurements, calculating some simple logic based on desired setpoints, and then sending out an on/off digital signal via NI 9477 to switch a solid state relay which in turn switches a motor on/off for each. This is all being done with NI Scan Interface for about 17 channels.
Everything functions fine until the Digital Out is set to "TRUE" on one particular channel (10). When this channel switches it throws noise across all the TC inputs and occasionally freezes all of them. Most bounce 10 degrees F high or low and channel 10 reads 60-70 F high. The only way to fix this is to assure that the DO on channel 10 is set to "FALSE" and to reboot the cRIO. I don't have this problem on any of the other channels!
All of the output voltages seem good when read with a multimeter. I've checked the physical wiring many times and cannot find any issues. There is no error out of the scan interface variables in the LabVIEW wiring diagram. Seems to me like the DO module and the TC input module should operate independently if not for the cRIO backplane they are both connected to. The cRIO and the NI 9477 DO module (which needs its own PS to send voltage out) do share the same power supply (NI FP-PS-4) although I can't see how this could be the issue.
If anyone has any suggestions I'd love to hear them! Thanks in advance for your feedback.
- John
Jared -
Each channel of the 9477 is connected to a solid state relay that is switching a dedicated circulating pump motor. Each of these channels from the cRIO is switching the relay with 28 VDC and 1 Amp (or less). On the other side each relay is using about 120 VAC to drive the pumps.
Like I said 16/17 of these channels give me no problems, its only the one channel that throws everything off. I don't have a way of testing just the TC module independently.
I'm thinking of changing out the pump motor. These do go out occasionally causing shorts - although I still have trouble believing this could be whats throwing off all of the TC data. Is that a waste of time or should I focus elsewhere?
Thanks again. - John
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FIOS router causing static and popping noises on computer audio
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Ways I found to eliminate the noises temporary:
Restarting the desktop computer or shutting down then turning on the desktop computer.
Ways I found to eliminate the noises permanently
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First I thought it was the Ethernet cable, so I replaced it. The noises did not go away.
I thought it might be the headset I use which are connected to the computer by a usb port. Unplugging the headset and using earphones which are connect to the computer by the audio slot did not eliminate the noises.
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I think I've narrowed the problem down to occurring only when the desktop computer is connected to the router by the Ethernet cable. Though replacing the Ethernet cable has not resolved the issue.
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I have Windows 7 Home Premium 64, 3.5 gigs of ram, and a dual 2.0 GHz processor.
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Try replacing the audio cables with better quality shield cables and see if that helps.
Are the router, speakers, and PC all plugged into the same outlet? Are they all polarized plugs? If note, try flipping the power plug on the non-polarized connections.
The sound could be coming from interference INSIDE the PC itself ... the proximity of sound cables inside and the audio chipset to the ethernet chipset. You didn't indicate if the audio/ethernet are on the motherboard or seperate cards. If they are seperate cards, try relocating the cards furfher from one another inside the chassis and also look at the audio cable (particularly the analog cable that runs from the CD to the audio card to make sure it's not routed past or near the ethernet electronics.
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Error report causes cd drive ejection noise
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ThanksChris Shaddock wrote:
I wouldn't even know where to start with console logs. How are they helpful? It nerver dawned on me that profile details would be helpful. I updated it.
Sure, profile info lets us know if your are running an old G5 or a new MacBook Pro, and which OS.
The console.app is in the Utilities directory. I keep an alias in my dock since it's such a useful tool.
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Try creating a new user account and see if the problem exists with the new user. That might thin down the area where the problem is being generated.
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Is my Mac Pro the cause of high pitch monitor noise?
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I used to run my Edirol off of my older MacBook and never had this issue. I just recently upgraded to a new MacPro and am encountering this issue for the first time.
Since the noise is eliminated when I disconnect the firewire cable from my interface, I believe the sound is being caused by interference from my computer, which is then transmitted through my firewire cable into my interface.
My setup is this:
Grounded Wall Outlet > Furman Power Conditioner > MacPro Desktop Machine > Edirol FA-66 > Monitors
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As of right now I've been able to make significant improvement to the noise problem and have eliminated it by 90%. The high pitch noise through my monitors is virtually eliminated but I still notice a faint bit of added noise when interface is powered on and connected to my computer via firewire versus when the firewire cable is disconnected.
Could my MacPro be outputting some kind of interference which is being picked up by my firewire cable and transmitted to interface and monitors? I've read that sometimes a computer's power supply unit can output a large amount of EMI or dirty electrical interference. It seems surprising to me that Mac's professional desktop machine would cause a fundamental issue like this though, especially since it is designed for being able to work in a professional audio recording setup.
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Try googling EMI & RFI, there are many online resources which detail how to troubleshoot and deal with these problems. http://www.arrl.org/radio-frequency-interference-rfi
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Try cleaning up your power supply, then maybe use different, higher quality sound cards or interfaces with your setup to see if the issue gets solved. The problem most likely lies with your computer and if you can get a high quality interface that can cut out the noise, that may be your only solution. It worked for me.
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My 2008 Macbook Pro makes a loud fan noise.
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I bought my 15" macbook pro back in October 2008. I was very happy with my purchase due to the machine's performance. But over the past year I have noticed an increase in the fan noise. It almost sounds like it's hitting against something at a very high speed, hense this irregular fan noise. The noise also increases drastically when I am working on Photoshop or InDesign. I also partitioned my hard-drive to hold windows so I can work on AutoCad.....noise increases also as I work on my machine.
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Message was edited by: Eduardo B1Hi everyone I just thought to come back here and answer to my own question since I found the bug that caused the humming noise on the CPU front speaker after all this time. It was that little Google Application called: "Google Notifier Appl." If you are having the same problem, delete that application. There is a bug there that interferes with the Computer Sound Board causing a terrible humming noise enough to annoy "da heck" of anyone. I Hope that helps!
Message was edited by: Eduardo B1 -
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I had the same problem, one of my fans was making a loud noise even when my computer was just idling. It can occur because you dropped the computer, thus damaging one of the fans, or the fan broke down partially. I took mine to the Apple genius bar and they ordered a new fan for me and installed it in under a week (all covered by warranty). This is likely a hardware and not software issue, the only way for a fix is taking it to a genius bar. -
Infinity, line noise, disconnections: incorrect in...
Hi,
I've had ongoing issues with disconnections on Infinity (and prior to that, copper broadband) - we were getting dozens of disconnections a day - and I think I've found the root cause: intermittent extreme line noise, caused by badly oxidised wiring in the XNTE.
I investigated the entire circuit from faceplate to openreach side of circuit and found the problem to be a very worn connection inside our XNTE (our house is a new build from 2010, so of course we have the infamous XNTE box on the outside wall) - the wires literally fell out of the plug when I touched them.
I've rewired, the line noise has gone and my homehub5 VDSL uptime is nearly two days (its not been this stable since May!) and now I have two questions.
1) Due to the extreme disconnection/error rate, DLM has dropped our data rate to 5.8Mbps download with noise margin of 27/33. How long will it take to re-train? Could/should I request a manual reset? We should be 40Mbps (and indeed, the service ran at this speed for a short while after initial install).
2) My main question: I've read that the XNTE is phased out, and new vDSL installs require the XNTE wiring to be gel-crimped (the XNTE becoming just a simple junction) and a new NTE5 + SSFP (service specific face-plate, I guess this is the one with the filter built into it?) installed as the master socket inside the house. Should this have been done when we switched over to Infinity? Would dearly love some moderator input into this second question. If it turns out we still don't have the correct wiring for Infinity this needs to be addressed.
Thanks in advance for any advice and help.
Solved!
Go to Solution.Hi punchybda,
Welcome to the forum and thanks for posting about the problems with your line and BT Infinity.
It can take several weeks for DLM to increase the profile again as long as the connection is stable and the noise is gone but if you send in your details we should be able to organise an engineer to visit you and make sure the Infinity set up is up to standard and while he is there he can also organise for the profile to be reset.
Please use the 'contact the mods' link in my forum profile to send in your details and we'll be happy to help you with this. You can find the link by clicking on my username.
Thanks
Neil
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry but we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’. -
Can AE location/placement cause Home Theater interference?
Right now, due to the Internet access point in my home, my AE (upstairs in one corner) is about as far away from my home theater as it can get (downstairs in the other corner). Since my HT is where my Apple TV and PS3 are -- as well as where my wife and I do most of our wireless laptop work, it makes a lot of sense to have Cox Cable come out and relocate the Internet access point to downstairs. In doing so, that would mean my modem and AE would all be housed in my HT Entertainment Cabinet -- where all my other equipment is (TV, PS3, receiver, speakers, Satellite receiver, etc.). What would be nice about this set-up, is I could run Ethernet from my AE to my PS3 and Apple TV. But, will the AE dual band wireless signals be at all degregated by all the other equipment in the same area? Will this cause any sort of 'noise' across my other components -- or visa-versa? Please advise. Thanks!
Welcome to the discussions, ChillOne!
It's a great idea to relocate the AirPort Extreme near the equipment so that you can use much faster and more reliable ethernet connections.
A simple modem could probably go into the cabinet if you keep it several feet away from other electronics, (check with your ISP for their recommendations on this) but the AirPort Extreme should be placed where it can provide a good wireless signal for your home. That means it must not be in any enclosed areas. Think of the AirPort Extreme as a water sprinkler and you want to get the room as wet as possible. Maybe the AirPort Extreme could go on top of the cabinet?
Unfortunately, it's not possible to predict wireless interference issues in advance of any installation. I think you are wise to realize that it will really help to keep the AirPort Extreme at least 3-4 feet away from other electronics or further if possible, even if it means running longer ethernet cables than you might have originally planned.
Message was edited by: Bob Timmons -
DVR620KU Makes Background Noise When Dubbing
Hi, I recently purchased a DVR620KU. I started dubbing VHS tapes to DVD+R. The VHS tapes sound good when I play them alone, but as soon as I begin dubbing to DVD I can hear background noise, like a persistent light tapping sound. Thus the DVDs end up with this background noise that isn't present in the original tapes. I tried different DVD speeds. I also removed the machine completely, plugged it into a different wall socket, and tried dubbing without the unit connected to any other devices. The noise was still present when I played back the new DVD. The noise is not present in DVDs that were not dubbed by this machine. At this point I am convinced that the Toshiba DVR620KU is the root cause of the background noise. Do you know what Toshiba's explanation is, and what is the recommended solution? Thanks.
The noise is initiating from the VHS playback, and then being written into the DVDs. The noise only occurs when the DVD is either dubbing or recording the L1 circuit (even when the L1 circuit is empty, the VCR playback is still affected while L1 is being recorded to DVD). When the DVD player is off, the noise is not present in the VCR playback. I'm not sure how to determine whether the noise is originating mechanically or eletronically. But it ends up as part of the sound transmission through the speakers. I'm not hearing something banging inside the machine, if that's what you mean. If you tapped on a microphone repeatedly while it was recording, this is what the output would sound like.
So far I've identified 7 VHS tapes that are affected by this problem, and 8 VHS tapes that resulted in excellent DVDs. I just burned a perfect DVD this morning. All the tapes are T-120 cassettes that were originally purchased as blanks. Several different brands and grades are represented. All of the "bad" tapes weigh more than 240 grams (average 257g), and all of the "good" tapes weigh less than 230 grams (average 204g). I know that blank T-120 cassettes generally become lighter over time, which means the "heavy" cassettes are probably generally older than the "light" cassettes. This also implies that the material was generally recorded with older VHS players on the "heavy" cassettes. The transition between the "heavy" and "light" tapes was probably around early-90's based upon the material on the tapes and when I think the data was originally recorded. So I don't know whether or not the weight actually means anything, although it could because mass can obviously impact mechanical vibrations. But the difference could also be that different tracking technologies were involved with the older, or heavier, cassettes and/or the machines they were involved with at the time the material was recorded.
I read on a different forum that VHS cassette tracking imperfections may be present all along, but they don't become audible until the digitization process amplifies some of frequencies involving the imperfections. I don't know much about that, but to me, it's plausible that the frequency processing and flow path out of the machine changes when the DVD player is recording. I'm not sure about that either, but something is definitely happening when the DVD recorder is on that affects the VCR playback on these heavier, older cassettes.
So, at this point, I can carry on knowing which tapes will be useful, and which will be problematic with this Toshiba dubbing process. The problem is what to do about it. Perhaps if I purchased another unit and ran the VHS output from the "slave" unit to the L1 circuit on the Toshiba, the problem might be fixed. Or, maybe this unit is defective, and if I exchanged it for a new Toshiba, the problem will be fixed. Or, maybe the Toshiba design includes this sensitivity, and the only solution may be to return it for cash refund and purchase a competetive product. Or, maybe the digitization process is what it is, and these old tapes are what they are, and there is no solution.
You said you have a DVR620KU and you've never experienced this problem. I don't suppose you have any old VHS T-120 cassettes that weigh ~250-260 grams? If you do, I would be curious to know whether you have the same issue. Thanks. -
Usb 3.o causing wifi interference
my La Cie Porsche USB 3.0 external HD is causing high levels of noise on my late 2012 Mac Mini wifi. Checked levels using WiFi Explorer app and noise levels run about 11%-15% with the HD turned off, and around 41%-55% with the HD turned on (Mounting or not does not seem to matter). I have a 2 TB HD and a 3TB HD and both cause the same problem.
Just checked to see if the noise is still there if I unplug the USB cord from the Mac Mini and then turn on the external HD... Funny thing, the noise does NOT appear! So it seems like the noise is as result of the connection between the external HD and the Mac Mini USB 3 port.
Anybody else have that issue?One last test... Plugged my Apple Superdrive in the Mac Mini USB 3 ports. Also pluged in a Wacom intuos 4 tablet in the USB 3 port of Mac Mini. Noise was lower than the HD plugged in... bouncing between 11% and 25%. That is with the HD's plugged into the Thunderbolt Display ports...
I put in a disc of pictures and video and played a video clip from a camera. the noise jumped up...
Just unplugged all usb devices from ports... noise still bouncing around... 7% to 31%.
There seems to be some correlation between USB ports and external devices plugged in, but there does not seem to be a consistent cause that I can put my finger on...
Oh, the modem I use for internet is the Motorola SURFboard SBG900 DOCSIS 2.0 Wireless Cable Modem. I use Shentel as my Cable ISP. The Modem/wireless router in in the basement and my computer is on the second floor of house. But my signal still comes in around the low 70% numbers... -
Having problems with encoder readings due to motor commutation noise
Hello everyone,
I wanted to ask for advice with a hardware problem which I believe is rather usual.
Here I describe my application:
We are controlling an electric actuator for a robotics application. We are using encoders to take position readings and we need to perform analog acquisition for other measurements (such as force measured with strain gauges).
The problem is:
In summary, I am having problems to acquire properly position readings from a quadrature linear encoders and also some analog inputs. The cause is the commutation noise generated by the motor drive we are using (which is a brushless dc motor Moog BN-23-23).
Our acquisition platform is a NI PXI-8106 with a PXI-1042Q chassis. We have two possibilities to acquire the signals. We have a multifunction DAQ M series NI PXI-6259 and a FlexRIO NI PXI-7951R with a DIO module NI PXI-6581R.
The commutation noise have a frequency of 30 kHz. In an oscilloscope we can see a series of noise peaks that are only present during a short period of time (about 1/10 of the period of the noise). The rest of the time the noise is not present.
The Accelnet amplifier module that feeds the electric motor provides us with a clock signal synchronized with the noise (which frequency is about 1/4 of the noise frequency). This clock signal provides a mean to solve the problem of the analog acquisition. We can use this clock to perform a buffered acquisition with an external clock in LabView connecting the clock to a PFI pin or to the FPGA card. But the noise is also corrupting this clock signal (we get a daqmx error warning us about possible glitches in the clock signal, and also stopping the acquisition). I believe that solving the encoder problem we can solve also the analog acquisition problem.
In the encoder readings the noise is making our counter count upwards or backwards gradually rather fast. We can get an increase in position of about 10 cm/second without any appreciable movement in the linear actuator.
It would be of great help if anyone could post the solution he is using to solve this problem.
Thanks in advance for your help,
jespestana
PS: I insist in my belief that we are having a hardware issue, because we are only having bad readings when the electric motor is working. I am convinced so because we have already performed encoder and analog readings using other drives, such as hydraulic cylinders. Thus, I think that it is not a problem of our software (of our LabView VI).
Solved!
Go to Solution.Hi jespestana,
I'm not sure why the noise would be causing your encoder measurement to increment more slowly... However I do have one suggestion on the M Series board (6259):
The M Series cards have built-in digital filtering on the PFI lines (see the M Series User Manual). It sounds like the noise is a series of ~3 us pulses (1/10 of 1/30 kHz). One of the available filtering frequencies that you may set on your M Series is 6.425 us, which should ignore any pulses (high or low) that are less than 6.425 us. You may set digital filtering with a DAQmx Property Node:
A caveat is that the driver only allows you to configure digital filtering for counter inputs on M Series devices. So, you could use digital filtering directly on your encoder task but not for your AI Sample Clock. A workaround can be found here, which involves configuring a dummy counter task to set the PFI filter for your AI task. If you're using the same PFI line for your encoder and AI task, you should just be able to set the PFI filter through the encoder task and not worry about the workaround.
With regards to the Flex RIO, I believe you could implement something similar on the FPGA, but I'm probably not the best person to comment about this. It would likely be a great deal more work than using the built-in filtering of the DAQmx API.
Best Regards,
John Passiak -
I agree too.
AMD AthlonXP 3200
2x52Gb DDR400
nForce2 Ultra
nVidia GeForce 5900
I try to resolve problem (drivers, IRQ, PCI Latency, PCI slots, memory tests...etc.), but nothing help me. EAX4 games crash after 30-60 min playing.TheMirage wrote:
Hi folks,
i've got this problem since i bought this god **bleep** Audigy 2 soundcard and i still have no solution to this:
I'm playing "insert random game here" and suddenly, after "insert random time here" playing, i have to take off my headset as quick as possible because the Audigy 2 is causing such a horrible noise. This is immediately followed by screen feeze or blue screen, so i have to reboot via power button.
- I've been trying various different driver including the one it was deli'vered with and the newest available, of course.
- I did a whole reinstall of the OS, just installed the card with drivers and installed a game (Operation Flashpoint to be exact) and guess what! Yeah, same problem! After testing a few hours, the above mentioned happened once again.
System:
Mainboard: Asus A7N8X
Chipset: nVidia nForce 2 (onboard sound, but disabled in bios), newest driver
CPU: AMD Athlon XP 2600+ (2 GHz)
Graphics card: nVidia GeForce 4 MX 440, newest driver
Operating system: Windows XP Service Pack 2, up2date
RAM: 024 MB DDR400/PC3200
Hi
- does Dr.Watson say anything (see on OS help)?
- what data BSOD screen tells (prog/dll causing error)?
- have you checked if there is IRQ/recource sharings?
- is audio full accelerated?
This so far ...
.jtp
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