Connecting Entran Accelerometers EGE-73A-100D1 to SCB-68 w/ PCI-6062E

I am trying to record information from three accelerometers that is connected to an SCB-68 board. The SCB-68 is connected to a PCI-6062E DAQ card on my notebook. Each of the accelerometers have 4 leads coming out of the cable. (+/- power and +/- output)
I have connected the +/- output leads to pin 33 and pin 66, respectively. Should I also jumper pin 66 to pin 32 (AIGND)? I am using an external 5V excitation voltage for the accelerometers.
Right now, I get erroneous information when checking the inputs on MAX. I am expecting a small signal voltage but I am reading signals from +10V to -1V, not uniform.
From the information I have given so far, am I connecting everything right?

The first thing I would check is the output of the accelerometer with a voltmeter or DMM. If you are reading expected values here, then double check you connections to the SCB-68 as well as your configuration in MAX. It sounds like you are wanting to acquire data in differential mode, so make sure your board is set to that mode in MAX. As for external connections, refer to the tutorial linked below that discusses numerous ideas to keep in mind when connecting sensors to data acquisition systems.
Field Wiring Issues

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How can I connect the output of a force transducer unit(BNC cable) to the PCI-6036E DAQ card via the SCB-68 block connector?

I m using the 404A force transducer unit by Aurora Scientific and i want to connect the (converted to Volt) output, which is a BNC cable, to the PCI-6036E DAQ card via the SCB-68 connector block, facing difficulties in choosing the correct input mode for my signal(couldn t clear this using the manual), setting the switches and which channel shall i use in the block connector in order to configure ot with LABVIEW

Hi MSc Student,
Connecting your transducer to the 6036E card via the SCB-68 connector block should be pretty straight forward. You have 2 choices of input mode, Referenced Single Ended (RSE) this is where you will connect the screen of the BNC cable to a ground connection for the DAQ card in the SCB-68 and the other to any analogue input channel . These are listed in the device pinouts in the help section of MAX, under the 68 pin devices section. The terminal block numbers correspond to the DAQ card's pin numbers. Another method, which avoids ground loop problems would be to use the Differential connection and connect the signal and ground connections of the BNC cable to a differential analogue input, these are listed in the 6036E manual and in th
e MAX help section again. the disadvantage to using this method is 2 analogue input channels are used and you must use the lowest 8 analogue input channels for differential inputs.
The switch settings that you need can be found in the manual for the SCB-68 in table 2-1, the manual can be found here : http://www.ni.com/pdf/manuals/320745b.pdf
The switches are for power to extra signal conditioning and the cold junction compensation for thermocouples which in your case you do not need so set the switches to the positions in the first box ie Direct feedthrough, with temperature sensor disabled and accessory power disabled. The channel you use should not matter the only ting to remember will be that if you use differential mode measurement that you will be connecting the signals to AI(n) and AI(n+8) so differential input 0 is across the connectors for AI0 and AI(8). The channel numbers corespond to the analogue input number for the card.
I hope this information helps,
Chris M
App
lications Engineer, National Instruments

My project writes accelerometer data to usb drive but shared variables do not communicate with modbus

Hi there,
I have got a program that reads input from 3 off 9234 modules on a cRIO, the idea of the program is to read this data and save it in a bin file to a connected usb hard drive, the program also uses shared variables to connect the max signals from the 9234 then send thm to a modbus slave, my problem is that althought I am now getting the correct data on the usb drive I am not getting anything down the modbus link, I attach the program for you to see, all the shared variables are on the rt low speed loop, any help would be most grateful.
Many thanks
Jason
Solved!
Go to Solution.
Attachments:
logger 2plusmodbus2.zip ‏679 KB

Hi Jasonh,
Thanks for posting your code! Due to the lack of comments on the code, would it be possible to direct me to where it sends the code to the modbus slave please?
This tutorial on How to turn a RT Target into a Modbus Slave using IO Servers may also be of some help.
Kind regards,
Tori
Student

Need Guidance On Data Acquisition Using Bluetooth of an Accelerometer

Hello everyone. I am completely new to LabVIEW and I have a few questions to ask.
So here is what I am trying to do. I have accelerometers connected to a microcontroller board (SK40C from Cytron, details are here) using PIC16F877A. Then, the output of the microcontroller is connected to a bluetooth module transmitter (SKKCA-21 from Cytron also, details are here). And from here, the data are transmitted to a laptop for LabVIEW data acquisition. My aim is convert the voltage into acceleration, display graphs and possibly storage of data.
I have searched through the forum and I got a little bit confuse of where I should start. These are a few question I want to ask:
1) What are the additional software/hardware that I need ? Because I read about this VISA and DAQ thingy which I'm don't quite understand about it.
2) Can anyone provide a step by step guide on what I should start with ? I am very very new to LabVIEW and time is abit of a constrain to me.
Thanks in advance for the help. Hope to hear some replies soon

The DAQ "thingy" is for use when using NI data acquisition boards. VISA is used to communicate with instruments/devices over a serial port, TCP/IP, GPIB, and sometimes USB.
Based on a brief look at the documentation, it appears that the transmitter connects to a computer via a USB cable. The USB driver creates a virtual COM port, so the computer should see a serial port. You can then communicate with the transmitter using VISA and treat the trasmitter as a serial port device.
You should first try talking to it using another terminal program. On Windows HyperTerminal is your best bet. This is to make sure you've installed all the required software and you can talk to it before getting into LabVIEW. Once you've been able to talk to it with (for example) HyperTerminal, then open up the serial port examples and try sending the same commands. You will need to determine from the documentation for the transmitter whether you need to append a special character, such as a carriage return or linefeed (or both) when sending commands, and whether the device ends its messages with a special character (such as a carriage return or linefeed). You should also read over the numerous articles in this page: http://zone.ni.com/devzone/cda/tut/p/id/4370

Using USB-6008 on LIS331 Accelerometer

Hi, I am looking to monitor my project with a LIS331 using the USB-6008 dac. Would this dac unit be acceptable with this accelerometer?

swong46,
I would recommend using a USB 63xx series DAQ device. You might also be interested in the USB 8452, which is a dedicated I2C and SPI device.
I can also put you in touch with some of our sales engineers, who would be the most knowledable about your options. Shoot me a PM if you're interested, and I can give you a number to call.
Kyle T.
Applications Engineering
National Instruments

How to read the sensorvalue of the Hitech Gyroscope and Accelerometer in LabVIEW 8.2

hello everyone,
I am trying to read the value of Gyroscope and Accelerometer (3 Axis respectively and simutaneously) in LabVIEW 8.2, but I didn't find any suitable standard VI . Should I create a new VI by myself ( in this case I need LabVIEW 7.1, don't I ?) or can I convert the standard NXT-G block to LabVIEW VI ?
I am looking forward to any reply. thanks
Liang

now I describe my problem with more detail. the VI ReadAccel showed me only "0" in LV8.2 , that means it dosn't work.
Attachments:
ReadAccel.PNG ‏8 KB

Very large values from accelerometer

Hello,
I did a small impact test in the lab, and recorded the acceleration. But I got very large peak numbers, like 300g, which is unreasonable. My vi has been checked by many people, seems like no problem. Does anyone have the idea why I got such big numbers?
Thanks.
Yuan

It would be helpful if you describe your hardware, DAQ , (signal-conditioner with setting) , sensor
and please post a link to the spec-sheet of the sensor and (if you have) the individual sensitivity (cal) value(s) of your sensor. (in metric if possible )
Now read the input voltage at a high sample rate (you can use one of the example vi's ) . If you have a pulse in the diagram hit edit-make current values default, save as a new vi and post that vi.
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'

Can I test for open or shorted accelerometers using an NI9234 module?

I'm using multiple NI9234 modules to acquire data from accelerometers. Is there anyway in LabVIEW to test the health of the accelerometers? I'm looking for either open or shorted accelerometers.
THANKS

Hi NI_1424,
From LabVIEW, we just read the voltages that are on the NI 9234. If you are expecting a voltage from an accelerometer but it is reading 0 V, it could be shorted or open. So, the short answer is "no". But you can deduce faulty accelerometers if you understand your setup and are seeing unexpected values.
Jeff Munn
Applications Engineer
National Instruments

Accelerometers

hi,
I am new to DAQ and in particular to accelerometers.
Any help with regards to how to chose particular models for a 0- 300g, 10-100mV/g sensitivity, 0(atleast 3hz or below )-10Khz, application involving vibrabtion testing of tendons would be greatly appreciated. some possible vendors include endevco (#7703-50) , PCB (#352c18 ,#353b03). Any information with regard to experiences with such vendors would be of great help.
please email to [email protected]
thanks
ananth

Ananth,
Beside the famous AD, you can also try out a newer kid on the block, a company called MEMSIC.
As I believe it, instead of mechanical moving silicon parts (using changing impedances), their devices use temperature-sensing techniques to detect the movement of a trapped gas. It has no moving parts, so this looks very robust to me.
Due to the temperature-principle, the bandwith is somewhat limited to 40 Hz.
On their website you can even ask for a sample, which is always handy for evaluation purposes.
Note: I have no commercial link with the company but was pleased by their friendly sampling-policy, rare these days if you are a small company.
Patrick de Boevere

Is there an FFT program (that logs data) I can use for accelerometer testing

Application is ... sensing vibrations from a downhole (drilling rig) air hammer tool. Need to log the data and distinguish the frequency fo the tool vibration from the drilling string vibration. Hammer tool noise is about 28 Hz.

Thank you for the question. There is an excellent LabVIEW tool that will distinguish vibration frequencies from one another. This is the Order Analysis toolset. It uses a once per rev (or multiple per rev pulse) as a base or fundamental frequency and is able to separate out the vibration signatures at harmonics and sub-harmonics. Standard LabVIEW or LabVIEW with the Datalogging and Supervisory Control Toolset both work well with the LabVIEW Order Analysis tools installed and working. I would be happy to provide example code, or discuss the application in more detail with you.
Sincerely,
Preston Johnson
Business Development Manager
Industrial Applications (Machine Vibrations)
National Instruments
512-683-5444
[email protected]
Preston Johnson
Principal Sales Engineer
Condition Monitoring Systems
Vibration Analyst III - www.vibinst.org, www.mobiusinstitute.com
National Instruments
[email protected]
www.ni.com/mcm
www.ni.com/soundandvibration
www.ni.com/biganalogdata
512-683-5444

Read from both load cell and accelerometer

Hi,
I'm trying to collect data from both load cell (which doesn't need excitation) and accelerometer (which needs 4 mA excitation). As you can see below, I wrote a simple program to collect data from both devices. However, my program provides 4 mA of excitation to all channels, one of which shouldn't receive any current. How can I selectively provide the excitation to specific channels?
Any suggestions?
Solved!
Go to Solution.
Attachments:
readfromtwodevices.vi ‏47 KB

Good morning jeongho20000,
Both aeastat and falkpl have provided excellent solutions for this. I also wanted to mention a good KnowledgeBase article found at ni.com by searching for "daqmx channel same task" in the internal search bar. This helps to outline both solutions. After searching, you can then select multiple entries, but the best that I found was the 3rd choice, titled: Using Different Types of DAQmx Global Channels in the Same Task.
You can download from the article the attached example VI titled Multiple Channels Created.vi, and modify the block diagram to fit your needs. Wiring the Task Out to the Task In of two DAQmxCreateChannel VIs is the programmatic equivalent of adding multiple Global Virtual Channels created in Measurement and Automation Explorer (MAX) to a common Task in MAX. Either method works, it is only a user preference. Feel free to reply if you need further clarification/explanation.
Best,
Message Edited by cyclone2k9 on 04-06-2010 11:08 AM
Message Edited by cyclone2k9 on 04-06-2010 11:09 AM
Adam
Academic Product Manager
National Intruments

Simultaneous acquisition of accelerometer and an encoder measurements of a rotating machinery.

I want to do a simultaneous acquisition of accelerometer and an encoder measurements of a rotating machinery.
So which National Instruments data acquisition product must be chose to do this capture.
Solved!
Go to Solution.

1st: check the voltage ranges of your encoders and accelerometers
2nd: do your accelerometers need IEPE power?
Ideas: (for accelerometers needing power and encoders with > +/-10V range)
NI USB 4432
NI USB 9232
NI CompactDAQ with 9232
other options in C series include 9234, 9229, 9215, etc.
In PXI, there is the 449x series of PXI express cards.
Do you have analysis and visualization requirements?
Take a look at these manuals:
http://digital.ni.com/manuals.nsf/websearch/5D343672A7367E6286257B9D00527B30
http://zone.ni.com/reference/en-XX/help/372416C-01/
Regards,
Preston Johnson
Principal Sales Engineer
Condition Monitoring Systems
Vibration Analyst III - www.vibinst.org, www.mobiusinstitute.com
National Instruments
[email protected]
www.ni.com/mcm
www.ni.com/soundandvibration
www.ni.com/biganalogdata
512-683-5444

Problem Lenovo p70-A Accelerometer

I bought lenovo P70-A yesterday and i instal game CarXdrift from play store, the orientation is bit off. how to recalibrate the Accelerometer sensor ?, i tried almost all callibration software in playstore but nothing work.
Thanks Before.
XXXXXXXXX
Moderator comment: Email address removed for member's protection.

i read this on one lenovo p70 forum, which the author solved his problem. below is the step (translated)
1. type * # * # 3646633 # * # * on dialpad and go to ENGINEER MODE menu
2. go to HARDWARE TESTING
3. scroll down until you find SENSOR menu
4. select SENSOR CALIBRATION
5. select Gsensor Calibration
6. place your handset on a flat surface and click Do Calibration
7. wait until "operation succeed" notification.
8. done.
hope this will help with the sensor problem

I need an accelerometer data anaylsis vi that will give displacement from transisent data.

Sample rate = 50 kS/s
no filter
event duration 20-40 msec
700 g's max
I want it to run inside of labview.
Any suggestion?

Curt,
I happened to be interested in this problem for some time to monitor
vibrations in rotating machinery with order track and a mix of eddy
probes, velocity sensors and..accelerometers. In order to compare
vibrations from eddy probes and those of seismic sensors, I had to
doubly integrate the acc responses--> your wish .
.. I guess you have only one channel and fairly fast card and not doing
it continuously in real-time but as one-shot transient analysis possibly
with pretriggering.
You have to doubly integrate the accelerometer signal with some AC
filtering and acquire the response above 100 KHz (2 X bandwidth of your
acc). That is easy to do: use integration vi from the library with an AC
filter (IIR takes much less time but FIR have a linear phase lag and do
n
ot distort the time signal but simply shifts it.
If you use 2 channels, beware that the integration vi is not reentrant,
but I guess it is no issue for you since you assume that the
acceleration is quasi zero before the shock transient. Of course you are
bound to miss the low-frequency contents of your acc response anfd thus
may miss some of the real displacement. That's physics and has nothing
to do either Labview or data processing.
If you are busy with Labview and S&V problems, contact me at
[email protected] after Tuesday.
Gérard
38curt wrote:
> Sample rate = 50 kS/s
> no filter
> event duration 20-40 msec
> 700 g's max
> I want it to run inside of labview.
> Any suggestion?

Interfacing TEDS accelerometer to microcontroller with 1wire interface.

Please suggest me how to interface TEDS accelerometer to signal conditioning hardware. I need 1 wire interface between TEDS accelerometer which is biased by -5V and microcontroller with 1.8V logic 1 wire interface.
Solved!
Go to Solution.

hi,
thank u for your reply.
this is our circuit(attachment). our teds works with -5V bias and microcontroller works at 1.8V and it has inbuilt 1-wire controller(in circuit i have send through attachment micro controller not shown) please suggest me how to design signal conditioning(voltage level translation with bidirectional control)
Attachments:
teds_signal.JPG ‏82 KB

Connecting Entran Accelerome​ters EGE-73A-10​0D1 to SCB-68 w/ PCI-6062E

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Connecting Entran Accelerometers EGE-73A-100D1 to SCB-68 w/ PCI-6062E