NI 4351 giving wrong sensor output
Hey guys, thanks in advance for any help recieved.
I have 6 sensors (3 RTD's and 3 thermistors) connected to a NI 4351 and the sensors were giving the right outputs a few months ago, but now all the sensors are giving out very low values. Any help will be greatly appreciated.
Regards,
Alim
Solved!
Go to Solution.
Glad things worked out.
-CC
"If anyone needs me, I'll be in the Angry Dome!"
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Hi,
I'm using a PCIe-6351 Daq board (and SCB-68) for my test rig. I'm collecting different kinds of sensor outputs through this DAQ board such as temperatures, acceleration, and torque meter output.
beside that, I have connected a VFD (Baldor H2 inventor) using a USB cable to the PC case. I use this VFD to control motor speed. (http://www.baldor.com/products/accontrols/vs_inverter.asp)
Here is my problem:
when I turn on the VFD I get a lot of noise on every signal. This noise is like a peak which repeats every 5-6 seconds.
So it's not 50-60 HZ noise of outlets.
You can see related uploaded video clips on :
http://www.megaupload.com/?d=4NHDIVV7
http://www.megaupload.com/?d=2461Z7KN
I have uploaded some pictures too.
Is there any way that I can filter this noise in Labview? ( I have tried Filtration VI in labview, but couldn't find a correct setting)
How can I get rid of this noise?
I really appriciate your help on this matter.
Thanks.
-Jeff
Attachments:
Pics.zip 585 KBI can very much identify with this issue. I have a test bench with two motors and corresponding Baldor H2 VFD's on it. I have a variety of sensors such as accelerometers, hall effect sensors, and a torque meter. The bench was put together "professionally" but still get this kind of noise.
The *only* sensor that I have this trouble with is the torquemeter. I get an impulsive EMI blast every 12 seconds on this signal with just one drive turned on. With the other drive turned on, the noise is excessive. I have spent weeks troubleshooting assumed ground-loop faults with the torque meter company's tech rep - to no avail.
I have confirmed that this EMI is from the drive. I hooked up a wire to the signal lead of an oscilloscope's VFD (acting as an antenna) and the noise I get on this oscilloscope is very similar to what I get on my torquemeter. (The noise is present only when the drive is powered up)
The noise from the VFD will not be cured by using a low pass filter. Impulsive type events have very broad band noise.
My new approach is to try and use adaptive noise cancellation to get rid of the the VFDs' EMI on the torquemeter. I gather the noise signal on my DAQ card (PCI-7851-R) by plugging just one wire into the positive port of an AI port and tying a 1 mega Ohm resistor from that port's ground to the AI port; this provides a means of collecting the EMI from the drive with an "antenna." The wire dangles by the side of the VFD with the other end taped up. See the following for a description of adaptive noise cancellation with labview (also possible on an NI FPGA device):
http://zone.ni.com/reference/en-XX/help/372357A-01/lvaftconcepts/aft_noise_cancel/
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Wrong query output..
Guys,
Please can someone help me ? I am getting a wrong query output.. There is data available for 31-DEC-2006 but the below query doesn't seem to display it.. What could be the reason ? The query displays results for all date except 31st
SELECT date_inserted ||','||
COUNT (DECODE (HR, '00', user_id)
) ||','||
COUNT (DECODE (HR, '01', user_id)
) ||','||
COUNT (DECODE (HR, '02', user_id)
) ||','||
COUNT (DECODE (HR, '03', user_id)
) ||','||
COUNT (DECODE (HR, '04', user_id)
) ||','||
COUNT (DECODE (HR, '05', user_id)
) ||','||
COUNT (DECODE (HR, '06', user_id)
) ||','||
COUNT (DECODE (HR, '07', user_id)
) ||','||
COUNT (DECODE (HR, '08', user_id)
) ||','||
COUNT (DECODE (HR, '09', user_id)
) ||','||
COUNT (DECODE (HR, '10', user_id)
) ||','||
COUNT (DECODE (HR, '11', user_id)
) ||','||
COUNT (DECODE (HR, '12', user_id)
) ||','||
COUNT (DECODE (HR, '13', user_id)
) ||','||
COUNT (DECODE (HR, '14', user_id)
) ||','||
COUNT (DECODE (HR, '15', user_id)
) ||','||
COUNT (DECODE (HR, '16', user_id)
) ||','||
COUNT (DECODE (HR, '17', user_id)
) ||','||
COUNT (DECODE (HR, '18', user_id)
) ||','||
COUNT (DECODE (HR, '19', user_id)
) ||','||
COUNT (DECODE (HR, '20', user_id)
) ||','||
COUNT (DECODE (HR, '21', user_id)
) ||','||
COUNT (DECODE (HR, '22', user_id)
) ||','||
COUNT (DECODE (HR, '23', user_id)
) ||','
FROM (
select distinct user_id,
trunc(date_inserted) date_inserted,
to_char(date_inserted,'HH24') HR
from production.gl_user_game_sessions ugs
where date_inserted between '01-DEC-2006' and '31-DEC-2006'
AND exists( select 1
from production.gl_user_registrations gur
where gur.registration_site = 'rokes.com'
and gur.user_id = ugs.user_id)
order by user_id,trunc(date_inserted))
group by date_inserted
order by date_inserted
Date,00:00 to 00:59,01:00 to 01:59,02:00 to 02:59,03:00 to 03:59,04:00 to 04:59,05:00 to 05:59,06:00
01-DEC-06,66,47,23,20,11,9,23,45,59,82,68,78,77,87,85,101,118,129,129,140,139,142,132,111,
02-DEC-06,88,53,29,24,15,19,15,38,53,66,83,96,85,116,128,139,133,132,123,102,133,125,113,113,
03-DEC-06,100,68,45,23,18,14,21,19,42,75,87,87,82,92,103,72,0,111,225,170,165,125,124,81,
04-DEC-06,70,42,25,36,8,15,22,35,58,68,54,75,78,78,101,90,125,130,132,112,107,132,122,81,
05-DEC-06,56,44,25,12,6,16,28,28,69,89,65,75,67,86,110,90,104,123,123,144,137,140,109,83,
06-DEC-06,54,36,24,11,12,13,21,28,60,72,61,89,67,73,105,94,104,106,131,127,170,123,134,85,
07-DEC-06,58,26,23,17,11,9,22,31,59,63,69,75,82,79,103,79,102,106,150,138,178,163,126,103,
08-DEC-06,59,45,19,17,12,10,24,35,59,57,75,64,68,59,92,101,108,123,131,119,133,129,110,80,
09-DEC-06,77,50,28,21,14,16,19,32,65,61,69,87,107,109,106,114,121,122,94,113,113,110,131,101,
10-DEC-06,73,57,42,16,21,18,20,25,34,61,44,88,62,88,96,127,140,107,141,115,117,126,93,78,
11-DEC-06,58,32,17,8,6,8,14,29,57,62,76,73,58,72,96,95,102,98,129,126,124,148,117,92,
12-DEC-06,67,37,20,15,11,16,19,33,62,76,75,55,67,71,75,98,103,101,116,119,134,121,120,88,
13-DEC-06,57,37,11,15,3,14,2,0,9,73,61,59,59,75,85,87,97,107,122,124,143,129,124,105,
14-DEC-06,55,39,14,16,11,17,25,35,40,61,54,62,69,68,87,79,108,99,118,132,132,142,124,82,
15-DEC-06,69,39,21,26,12,13,17,27,50,64,69,60,74,88,88,92,115,105,114,127,106,123,117,114,
16-DEC-06,77,59,27,24,20,16,17,24,41,68,75,98,82,87,90,111,103,122,102,99,131,71,117,103,
17-DEC-06,84,47,22,17,13,13,12,25,40,59,45,56,72,82,85,96,88,106,107,117,149,116,105,82,
18-DEC-06,51,24,29,12,15,10,10,28,38,38,48,47,59,80,72,74,91,103,100,116,119,123,139,83,
19-DEC-06,53,36,17,12,11,23,20,29,58,77,70,71,62,83,81,89,106,104,101,120,130,118,125,94,
20-DEC-06,60,32,12,18,11,14,17,27,53,56,66,67,76,65,103,103,125,92,112,123,109,130,108,86,
21-DEC-06,50,29,22,16,9,12,22,34,35,58,78,71,62,85,101,105,110,124,129,147,156,129,108,88,
22-DEC-06,64,36,23,28,20,14,31,44,58,49,65,78,76,81,109,117,139,138,141,121,112,130,128,94,
23-DEC-06,95,67,31,28,22,13,21,32,40,48,80,76,83,105,123,126,118,155,131,124,147,124,135,106,
24-DEC-06,84,53,44,31,15,18,22,33,36,58,76,82,91,90,113,124,118,113,98,108,117,124,107,91,
25-DEC-06,71,54,40,15,12,20,17,22,38,61,56,70,63,73,94,93,109,97,87,100,98,109,85,84,
26-DEC-06,56,45,18,23,13,14,14,18,35,48,73,82,95,115,143,153,136,147,111,110,138,125,96,85,
27-DEC-06,82,42,27,18,13,13,27,18,37,60,65,87,78,94,164,166,171,147,160,143,120,150,118,115,
28-DEC-06,98,51,38,28,18,22,16,25,49,57,78,82,95,129,145,135,145,142,133,157,183,165,131,136,
29-DEC-06,93,62,32,20,16,13,24,31,51,72,71,84,96,110,179,166,190,167,156,153,142,162,148,114,
30-DEC-06,94,66,44,28,18,18,21,21,41,53,95,87,91,139,161,154,201,162,150,166,152,128,144,133,
SQL> Thanks in advance
GHi,
try this:
where date_inserted between to_date('01-DEC-2006 00:00:00','DD-MM-YYYY HH24:MI:SS') and to_date('31-DEC-2006 23:59:59' 'DD-MM-YYYY HH24:MI:SS')(not tested) -
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Please Mark This As Answer if it solved your issue
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Windows XP Prof, AMD Athlon, 1 Go Mem
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But when several files are changed and are compiled the warning is only displayed for the current source file and all classes output trees must be scanned manually.
When testing the app if I'm not wrong JDev reads from the classes directories and doesn't produce a jar file, so deleting manually the wrong classes is a valid workaround.
But what if the app gets deployed and jars are generated?
I can't imagine myself changing manually the produced jars by removing the wrong classes and what about the manifest?
Your help is requested.
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Fred
PS Can't provide a TestCase => happens in complex environment only.Glad to know I'm not the only one having that serious problem.
JDev by default create at least 2 different projects (model and view) so it seems to be a standard.
Working simultaneously on source files of different projects seems to the cause the trouble.
Is there somekind of patch available?
Could somebody of Oracle answer the question of the first message of this thread?
Thanks
Fred
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