Fieldpoint Noise

I am witnessing a strange situation on my
Fieldpoint system.
I have one FP1000 and two RTD-122 modules (both fully populated). The RTDs
monitor the temperature in 4 mixing tanks.
The Fieldpoint modules are housed in a separate metal, (earthed) enclosure
along with a DC power supply. All of the RTD cables are shielded and connected
to earth at one end.
The main control panel houses three inverter drives (all with manufacturers
input filters fitted), and some other control gear. Motor cables are all screened
and screen are terminated correctly.
The system has been running perfectly for several months, until last week. I
had a call to go to site because the temperature reading were 'all over the
place'.
Whenever any of the three mixer motors are now run, the temperature readings
float from -50 to +200. Stopping the motor returns the temperatures to their
normal level.
The only event that has occured recently is that some sub-contractors dropped
something on the armoured supply cable (which is outside), and fractured the
insulation on the case of the cable and some of the conductor insulation. Due
to heavy rain, water has leaked into the cable and it has eventually tripped
out the supply. Is it possible that this may have damaged the filters?
Anybody experienced similar problems with Fieldpoint?
Thanks in advance
ssk

ssk,
Company I work for sells drives and most of the problems I've seen like this are caused by bad grounding. In your case it worked and then quit after damage to cable. I suspect that the ground wire in the armored cable may have been damaged. Has the damaged cable been replaced? Input filters on power supply will not work without a proper ground connection. Suggest you install a new supply cable.
If the cable has been replaced, double check that the input supply ground to the power supply has been properly installed. Make sure that no changes were made in how wires were routed and how they were connected. If all supply connections have been double checked and found to be correct, then I would replace supply.

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Data acquisition time using Fieldpoint with Ethernet Comm Mod

I am using a simple Labview program that is a simple Do While loop that gets a signal from a Fieldpoint AI module using a FP1601 ethernet communications module. The signal is changing at a rate of 50 ms or so but I cannot get the program to read it quickly. I am using a Wait Millisecond to control the speed of the acquisition and for some reason I can not get the data from the Fieldpoint module faster that approximately 0.7 seconds, even if I put 50 ms as the Wait Millisecond. I tried to change the acquistion time of the AI module (it is at 10 ms) but this doesn't help.

Hardware filter setting was my hunch.
Be aware the Fluke may be performing averaging internally and have a slower response time, thus your Fieldpoint data may be real. The only way to know for sure is to hook up an oscilloscope to the device.
Can't suggest any specific filtering, it may depend on the nature of the 'noise'
-AK2DM
~~~~~~~~~~~~~~~~~~~~~~~~~~
"It’s the questions that drive us.”
~~~~~~~~~~~~~~~~~~~~~~~~~~

How to measure and log frequency with fieldpoint CTR

Hi,
I am developing a data acquistion and control system for an engine dynamometer using the fieldpoint modules and Labview. One of the most important signals is the engine speed, measured in RPM. The RPM signal is a 0-12V pulse where one pulse equals one revolution of the engine. As well as being an important piece of data for later analysis, engine RPM will also be in the input into a PID controller, so the signal must be both accurate and have a high measurement frequency.
Currently I am using the FP-CTR500 modules to measure the frequency of the signal. I am already aware of the included frequency measurement VI example, as well as the one posted before for low frequency measurements, and I have gotten both to work with my setup. I would be using the low frequency VI becuase the max frequency measurement would be in the 200Hz range.
The first problem I am having is with the structure of the VI and how the data is output. The case structure in the VI activates when the counter is read and resets the counter, then switches to the next case. I would like the RPM number to output out of the case structure into a write_to_file VI and PID controller input. The problem is that when the case switches, the counter is reset to 0, which will be recorded in the written file.
This is some example output data (RPM):
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0
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0
2521
0
The data is being written correctly, but of course I can't have 0 readings when the case structure changes. This would be especially problematic when input into a controller VI.
The next problem I am having is with sampling rate. If I were to use the low frequency measurement VI, the sampling rate of RPM would be variable based upon the the speed of the signal. Or, the original frequency measurement VI has an adjustable sampling rate. Of course, in my system there are a number of other signals that need to be recorded at the same time. I have found that as I am collecting data, the "write to file frequency" is entirely dependent on the read frequency of the frequency measurement. Therefore, if I had set the read frequency VI to read at 1 Hz, data will be recorded only every 2Hz. Ideally I would like an overall measurement frequency of all channels (mix of analog and digital) to read between 20-50Hz, but if I am limited by the frequency measurement.
Any ideas on how to solve this problem, either through Fieldpoint or Labview?
I can post my VI if this help.
Thanks,
Huang

Thanks for your reply.
I should probably describe my current setup before I go into anymore details with the problem. As for my specific setup, I am using an FP-1000 connected with an AIO600, AI110, CTR500, and TC120 all running through the RS232 line to a desktop running labview 8. The actual counter module is reading a tachometer signal output from a separate engine controller. THe output is a 0-12V ON 50% duty cycle signal. As for data logging, i am simply using a "write to measurement file" Express VI. I have a while structure which holds all of the express VIs which access the fieldpoint IO, and these are all routed to the "write to" VI.
As for the specifics of the data logging problem, as I said, when I set the count frequency of the "Fieldpoint Frequency Measurement" VI to 1Hz, (which means the VI calls the case structure at 2Hz), the "write to measurment file" VI is called at the same rate (2Hz). Which means that the overall logging rate of the VI is only 2Hz. Is there someway to decouple this?
I was able to solve the problem of calling the frequency variable from the case structure by using a local variable which is called outside the case structure.
And now I have been having a lot of problems with reading the actual frequency from my engine controller. THe actual signal will only range from 0 to around 200Hz. I noticed, by comparing the actual signal to what was being read in my labview program, that after around 80Hz the signal increases by around 1.5times more than the actual signal. ie. Actual signal = 100hz, Read Signal = 150Hz. After trying to figure out what was the problem, I decided to change the Noise Filter settings to 200Hz. It actually worked for all the frequency ranges up to around 150Hz but after that the filter attenuates the signal to the point where the actual signal is 160Hz, but is being read at 100Hz. My question is if there is a way to change the actual filter setting outside of the 2 given setpoints (200hz and 40khz) or if you have any other suggestions on how to fix this problem? I was thinking of creating a noise filter input in MAX so that i could play with the values in Labview, but am i only limited to those two filters?
Thanks again for your help,
Huang

High current causing noise on thermocouple input spoiling reading.

I have a J-type thermocouple I'm measuring using a PCI-6036E and an SCB-68. The thermocouple is attached directly to a charging/discharging capacitor - once the rms current through this cap reaches above about 80A noise on the thermocouple input causes the temperature reading I'm getting through LabVIEW to sink to below -10000 (which is obviously incorrect). Below about 80A rms it works fine and when I connect the thermocouple to a meter instead of the SCB-68 it works fine. Is there any kind of input buffer I should be using inside the SCB-68 or some kind of software compensation I can perform on the reading?
Thanks!
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Neil-
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If you are only looking at one t/c, you may want to get a signal cond
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Up until today I was convinced that Compact Fieldpoint was the way to go on our new plant but I have read several posts on this forum about loosing network connections to the units and other horror stories which make me wonder about their reliability in the real world. Like most people we simply cannot afford to have to reboot occasionally, this is unacceptable.
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Tony,
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Hi Labjock,
Welcome to the Support Communities!
The article below may be able to help you with this.
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Message was edited by: michael08081

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Frozen or unresponsive iPad
Resolve these most common issues:
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USB 6009 thermocouple noise

I'm using NI-DAQmx 7.5, Labview 7.0, and a USB-6009.
I'm trying to get a more accurate reading from my j-type thermocouple. It is now distorted with noise and jumps rapidly +/- 20 degrees around room temp without any heat being applied. When heat is applied, it climbs as it should but with the same variation. I haven't moved to the labview side of it yet, I'm still trying to get a usable reading in MAX. I have it wired as a differential input with a floating signal source. I've installed 10k ohm resistors for bias current return as instructed. Installing the resistors helped but still leaves me with the readings shown in the attached pic. I've also tried grounding my USB 6009 with no results. Please help. john
Attachments:
thermocouple reading.jpg ‏41 KB

Hi John,
What you are running into is a problem with the actual voltage resolution of your USB-6009. This device has 14-bits of resolution over a minimum range of +/- 1V. That means that the voltage resolution is (1 - (-1))V / (2^14) = 2V / (16384) = 122uV. While this is an excellent resolution for such a low cost USB device, you will still notice problems when trying to make a thermocouple measurement. The reason for that is that Thermocouples make a very small output voltage (see image below).
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K type: 41 microVolts per degree Celsius
J type: 56 microVolts per degree Celsius
T type: 52 microVolts per degree Celsius
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Message Edited by Otis [DE] on 01-13-2006 11:37 AM
Message Edited by Otis [DE] on 01-13-2006 11:38 AM
Otis
Training and Certification
Product Support Engineer
National Instruments
Attachments:
761029-Thermocouple_Voltages.GIF ‏10 KB

USB 6009 Data Acquisition noise

When I acquire the voltage from USB 6009, It gives some fluctuation/Noise (Please check the image, green color).
What is the reason for that?. How to overcome this noise? One way is averaging, is there any other ways to do or overcome this problem
Could you please suggest me?
Thank you,
Best Regards,
Rathan
Attachments:
Noise.GIF ‏16 KB

Dear Rathan
The correct Terminal configuration depends on if your power supply is floating or grounded. Please have a look at tabel below.
As to the filter, which type of filter to use depends on the frequency of your signal. If your frequency (or frequencies) is low a lowpass with a cutoff frequency a bit over your frequency would be best. Conversly if your frequency is high a highpass with a lower cutoff frequency would do the job. If you are interested in only a single or small spann of frequencies a bandpass could be used.
You can filter your signal either via a hardware filter before you acquire it via your DAQ, but that would require that you have or can build a hardware filter that fits your needs. Else you can filter the signal in software after you've aquired it. The filters in LabVIEW can be found in the functions palette under Signal Processing -> Filters. I think a butterworth filter would do nicely. You can find an example through the LV Help.
Best Regards
David
Message Edited by DavidEk on 07-29-2009 05:03 AM
Attachments:
Connection Configs.PNG ‏66 KB

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After reviewing your post, it sounds like the phone makes a cracking noise when it vibrates. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.
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Thanks for using Apple Support Communities.
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<Email Edited by Host> .

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Hi loist,
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