Certain frequency artifacts appearing in data

Hi,
I've noticed in my measurements that there are two particular frequencies that always appear, regardless of what I'm measuring. I use a DAQ board (PCI 6010) to perform voltage measurements, and Signal Express to control and analyze the data. I use a differential measurement (between ai0 and ai8, I believe) to measure the voltage output of a piezoelectric (to prevent charging). I always see a noise signal - artifacts? - at about 4 kHz and at about 9 kHz. I've found that the input range that I select is extremely important, for instance, if my signal is 20mV p2p and I've chosen an input voltage range of +/- 5 V, there is considerable noise, with these two frequencies very prominent; if I narrow the input range to perhaps +/- 30mV, the noise is much reduced, but the two frequencies are still there. These signals have appeared in data that I've taken over many months, on various systems, and at different times of data, etc. - but they do not appear if, using the same piezoelectric, I look at the data with an oscilloscope.
I certainly could simply filter these frequencies out - I use the bandstop filter function to remove the 60 Hz noise, but in my research I'm interested in the frequencies that are excited in a system that are in this frequency range, and I worry that by trying to filter these two out I may also remove some important data along with it.
Is this a common problem?
Thanks! Myra
Sorry if this is the wrong discussion board to use - I wasn't sure where to post

Sorry - from reading an earlier message in this board I saw that "measure" has to do with an add-on for excel, not for making measurements. I'll post my message in a different board.
Thanks! Myra

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[solved] Intel Corporation 82830 CGC: Artifacts appear in X

The more I use my laptop in X11, the more artifacting appears. It gets really bad after 10 minutes of use or so. This is on a Panasonic CF-M34 laptop. I know the hardware is 100% functional too.
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[max@coppertop ~]$ lspci
00:00.0 Host bridge: Intel Corporation 82830 830 Chipset Host Bridge (rev 04)
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# File generated by xorgconfig.
# Copyright 2004 The X.Org Foundation
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# The X.Org Foundation BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
# OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# Except as contained in this notice, the name of The X.Org Foundation shall
# not be used in advertising or otherwise to promote the sale, use or other
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# Refer to the xorg.conf(5) man page for details about the format of
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# Multiple FontPath entries are allowed (which are concatenated together),
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# FontPath "/usr/lib/X11/fonts/misc/"
# FontPath "/usr/lib/X11/fonts/75dpi/:unscaled"
# FontPath "/usr/lib/X11/fonts/100dpi/:unscaled"
# FontPath "/usr/lib/X11/fonts/Speedo/"
# FontPath "/usr/lib/X11/fonts/Type1/"
# FontPath "/usr/lib/X11/fonts/TrueType/"
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# Uncomment this to disable the <Ctrl><Alt><Fn> VT switch sequence
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# Uncomment this to disable the <Ctrl><Alt><BS> server abort sequence
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# Option "DontZap"
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# Uncomment this to disable tuning with the xvidtune client. With
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# Option "XkbModel" "pc105"
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# Option "XkbLayout" "de"
# or:
# Option "XkbLayout" "de"
# Option "XkbVariant" "nodeadkeys"
# If you'd like to switch the positions of your capslock and
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# Option "XkbOptions" ""
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# Option "MinY" "15372"
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Last edited by synthead (2009-02-12 10:37:09)

I was just going "...wow, ouch..." at the screenshot and since the model name looked old (and a quick google afterwards revealed that it wasn't), I marvelled at how Linux could manage to display so many colors [on the supposedly old hardware I thought was sitting behind that model name].
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-dav7
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I've trailed the net with no joy. It just seems mega-odd how it's only with certain types of music - as though it's certain frequencies it doesn't like. But it's not the speaker, it's something up with the PC. But it's fine playing locally.
Any ideas?!

Hello Andy,
Thank you for providing so much detail with the AirPlay issue you are experiencing. You have definitely taken some great steps to isolate the issue. I found a couple of resources that I think might help with the playback issue you are experiencing.
First, I recommend following the steps in the section titled, "Troubleshooting performance issues with AirPlay or AirPlay Mirroring" in the article below:
Troubleshooting AirPlay and AirPlay Mirroring
http://support.apple.com/kb/TS4215
If you are still experiencing the same issue after following those steps, I recommend checking to see if a third-party iTunes plug-in could be causing the playback issue. You can find steps the steps in this article:
iTunes: Troubleshooting issues with third-party iTunes plug-ins
http://support.apple.com/kb/TS3430
Thank you for using Apple Support Communities.
Best,
Sheila M.

Trigger CCD camera at certain frequency

Hi,
We are trying to trigger a CCD camera for capturing image at certain frequency. Our hardware setting is as follow: we have NI PCI-6281 DAQ card installed on the computer. It connects to BNC-2110 box. The trigger output PFI 12/P2.4 on BNC-2110 was connected to a CCD camera through a 12-Pin Hirose female to BNC cable.
To test whether the triggered image capture works properly. We used Gen Dig Pulse.vi and Triggered Grab.vi. The triggered image capture did work, but it does not work at the desired frequency set by us. I assume the frequency is (1/(high time + low time)). Any suggestion?
Thanks.
Attachments:
Triggerd Grab Test 2-1.png ‏240 KB

This answer doesn't make sense. If what you say is true, the camera isn't really synchronized with the clock.
What happens if you set the off time to a very long time like 20.2 seconds. Do you see a new image every 20.7 seconds, do you see two images captured close together then a long gap before the next 2?
Mike...
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Mac Pro Freezes and horizontal artifacts appear on Display

My Mac Pro display began glitching while using After effects yesterday. The display colors became very strange and horizontal artifacts appeared. Everything froze and I couldn't force quit. After a minute the problem cleared up and all was well.Then today the glitches got more frequent and the whole machine froze up showing the same, but random horizontal artifacts along with strange colors. I can't move the mouse or force close programs. I've had to power off the machine by holding the power button down. I did that twice today and both times the computer started normally and then the problem came back a minute after start up. The mouse and keyboard also started losing power yesterday and today. A quick unplug and plug in fixed that problem. I have been using After effects 8 hours a day for about 4 weeks straight Perhaps that but some strain on the graphics card. Any help would be greatly appreciated. Thank you!
Here's a link to a picture of what the display looks like:
http://s1254.photobucket.com/user/timfoxweddings/media/photo_zps70928015.jpg.htm l

Those sorts of artifacts are unlikley to be a software or configuration problem.
The Apple firmware 5770 (about US$250) works in every model Mac Pro (65lb tower), but may have minor problems if you play copy-protected movies. It requires 10.6.5 or later, so you would have to upgrade if you are still on 10.5.8.
You lose AppleTalk-over-Ethernet in the 10.5 to 10.6 transition, if that is an issue for you.

Certain frequency artifacts appearing in data

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