Hi labjack team, may i know whether this type of sensor (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrt...) can connect directly to the 5V outlet from U12 DAQ ?
Thank you.
Hi labjack team, may i know whether this type of sensor (https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrt...) can connect directly to the 5V outlet from U12 DAQ ?
Thank you.
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The sensor needs an excitation voltage of 3.0-5.5 volts at 0.8 mA, so yes you can power the sensor from +5V and GND on the U12.
The signal is 0.5 to 4.5 volts, so yes you can connect that to an analog input on the U12.
The sensor does not have DC response ... AC only. You will want to make sure you sample fast enough to acquire the signal you are interested in:
https://labjack.com/support/datasheets/u12/datarates
Note that all our other devices are newer and much faster than the U12:
https://labjack.com/products/comparison
Here is our accelerometer app note. I might add mention of this TE part as it looks very easy to use for dynamic accelerations.
https://labjack.com/support/app-notes/accelerometers
Thank you for the feedback labjack team.
What if I use this sensor with T7 pro? or I still need to find another sensor with DC response?
It looks like your TE accelerometer will work great with a T7-Pro. Use one of the analog output channels (DAC0) to generate a stable excitation voltage between 3.0V and 5.0V with Kipling (pin 3 of your sensor), connect pin 2 (GND) to the GND screw terminal on the T7, connect pin 1 (the output) to AIN0 of the T7, and then use LJStreamM to read AIN0 at a configurable speed between 1KS/s and 100KS/s.
Note: S/s: Samples per second
Thank you for the information labjack team, really appreciate it.
Can you give me a few suggestion plug and play vibration sensor tht compatible with the U12.?
Your TE sensor is compatible with the U12, but are you looking for other options? You mentioned you are doing vibration measurements, and with vibration measurements you typically only care about AC response and DC response does not matter.
It appears that TE has acquired Measurement Specialties, so this is a good place to look:
https://www.te.com/usa-en/products/sensors/vibration-sensors/plug-play-a...
If you want a packaged sensor with a cable that has DC response, start here for options from TE:
https://www.te.com/usa-en/plp/plug-play-accelerometers/YG2dw.html?q=&d=5...
Sensors that can be powered from 5 volts (or less) are the most convenient, so ask them about that.
Doing a quick search, here are some other manufacturers you could check with for packaged MEMS accelerometers. Avoid ICP & IEPE sensors as they are difficult to work with unless they have excitation and signal conditioning included:
http://www.pcb.com/products/productfinder.aspx?tx=14
https://www.silicondesigns.com/compare
http://www.jewellinstruments.com/sensors-and-controls-2/mems-acceleromet...
http://www.djbinstruments.com/products/piezoelectric-accelerometers/dc-mems
Thanks for the info labjack team.
Currently, I'm using the TE sensor with T7 pro. Since the kipling based on LUA language, can you give me sample syntax to set the digital port to generate 3v to 5v excitation voltage.
Your help is much appreciated.
You can just start by using a VS terminal to power your sensor:
https://labjack.com/support/datasheets/t-series/vs
Then if you decide you want something more stable, I would suggest a DAC terminal rather than a digital output. You can use the Dashboard in Kipling to set either DAC line to 4.5 volts.
https://labjack.com/support/datasheets/t-series/dac
I don't see any reason to use Lua scripting here.
Thanks for your feedback, right now im having problems to connect with the t7 pro with labview.
How i can ensure the t7 pro icon appear in labview function palette. I tried it but only the ljm icon appear.
Before this i tried to put the u12 icons and it succeed (refer the attached image). But for t7pro, im stuck.
A. Start by reading about stream mode. You will use stream mode to acquire waveform signals from your dynamic sensor:
https://labjack.com/support/datasheets/t-series/communication
https://labjack.com/support/datasheets/t-series/communication/stream-mode
https://labjack.com/support/software/api/ljm/function-reference/stream-f...
B. Next, use LJStreamM.exe to acquire signals from your accelerometer and make sure the hardware is working as expected. This will also let you experiment with stream settings (e.g. scan rate) to decide what stream settings you want to use.
C. Next, go through the basics of LabVIEW.
LJM is the library for the T7-Pro. Everything you see will say "LJM" not "T7".
To get going go through the "Getting Started" steps 1-6 here:
https://labjack.com/support/software/examples/ljm/labview
D. Finally, open a stream example in LabVIEW to try streaming a waveform signal from your accelerometer. I suggest "Stream Basic.vi".
Hi labjack team, how to know suitable excitation voltage to be used for this accelerometer since we can control the excitation voltage in the dashboard (kipling).
and
how to scale the output accelerometer voltage in labview?
thank you.
One more thing, how to correlate between voltage and acceleration? Since our output in V, but we interested to know the acceleration value as well.
I suggest you set DAC0 to 4.5 volts and use that for your excitation. Use Kipling to set DAC0=4.5, and then go to the Power-Up Defaults tab to save that setting.
From your sensor's datasheet, the signal output has a bias voltage of Exc/2. That means you need to know the actual value of the excitation voltage at all times so you can subtract Exc/2 from your readings. I suggest you connect a jumper wire from DAC0 to AIN1 so you can use AIN1 to measure the actual value of your excitation voltage in real time.
If you have the 20g sensor, the output of the sensor is Exc/2 plus 100 mV/g. That means if your excitation is 4.5 volts, the output of sensor will be:
-20g 0.25V
0g 2.25V
20g 4.25V
SensorOutputV = Exc/2 + 0.1*g
AIN0 = AIN1/2 + 0.1*g
g = (AIN0 - AIN1/2) / 0.1
Kipling does not do any scaling, but LJLogM and LJStreamM do.
Thnks for the feedback labjack team.
Hope you can reply several questions below:
1. Do this labjack has frequency hopping?
2. Can we adjust the frequency hopping to meet industrial frequency?
2. If I have 2 labjack, can one labjack transfer its data to other labjack and both data from the 2 labjack send to a router?
3. If I want to buy the oem labjack type, can your company customize based on our preferences and can you the list down the customization option?
4. Can I customize the wifi module?
5. Is there any setting for sleep mode and idle mode for this labjack and how?
6. I try to read voltage using this TE accelerometer as mentioned above using labview. I set the excitation voltage to be 2.25V which is at 0g (acceleration). But when i read in labview, the value of g is negative value, may i know why this happen?
1&2. I am afraid I don't know what you mean by frequency hopping in this context. You will have to explain further.
3. No the T7s can't talk to each other. Both need a connection to the host over USB, Ethernet or WiFi.
4. At low volumes we can usually do the customization. At higher volumes it should be done by an electronics shop that specializes in that. Let us know what sort of customization you might want and we can let you know if it can be done:
https://labjack.com/support/datasheets/t-series/oem-versions
5. What sort of customization would you want for the WiFi module?
6. The T7-Pro does have the ability for a low power mode, but I don't think it has been implemented or supported. I will check further. Are you concerned about power usage?
7. You can test your accelerometer like you describe right on the Kipling Dashboard. You can use LabVIEW, but the Kipling Dashboard is a quick way to do your initial test of set DAC0=4.5 and read AIN0. Connect DAC0 to Pin3:+EXC, GND to Pin2:GROUND, and AIN0 to Pin1:+OUT. You should see that AIN0 reads 2.25 volts if there is no acceleration. Use a voltmeter to check by measuring the voltage from DAC0 versus GND (4.5 volts) and AIN0 versus GND (2.25 volts).
Dear labjack,
Its okay, just ignore the question. What sholud I do if my data include noises, i already put window and filter function in the labview, but still the result is unsatisfied. Do you have any suggestions for tht? I think my labview programming is the main culprit if this problem. Or do i need to put amplifier or other components to get a good result?
thank you
Noise can come from a lot of different places. We will need to go through a few tests to find the source or the noise.
The first thing to do is make sure the labjack is working well. Remove all signals from the LabJack and connect a wire between an analog input and ground. If you want to test differential connect two adjacent AINs to GND. Verify that the noise level matches the specs here: https://labjack.com/support/datasheets/u12/appendix-a
If the U12 seems to be working properly then we will need to examine the signal source and connection.
The U12 is a 12-bit system, so when running at ±10V the resolution is ~ 5mV. It is tough to get below 2-4 bits of noise so 10-20 mV is the best we can expect.
thnks for the feedback labjack team.
If I insist to use IEPE accelerometer with t7 pro. can you suggest what labjack accessories I need to buy for signal conditioning and external power supply.
regards.
We do not offer any signal conditioning for ICP or IEPE accelerometers:
https://labjack.com/support/app-notes/accelerometers
You will have to find a 3rd-party source for that so search for "iepe signal conditioner". If you find any of interest post links here and we can look at them for you. Here is one of the first results when I searched:
http://www.djbinstruments.com/products/instrumentation/signal-conditioning
Hi LabJack team,
I have purchased the T7 Pro, and I need to connect the following linear encoder to it:
https://www.aliexpress.com/item/Free-Shipping-Factory-Best-price-Linear-Scale-5micron-Linear-Encoder-100-150-200-250-300-350/32830180883.html?spm=2114.search0104.3.15.308e2d55YrUiQF&ws_ab_test=searchweb0_0,searchweb201602_6_10065_10068_10547_319_10059_10884_317_10548_10887_10696_321_322_10084_453_10083_454_10103_10618_10307_537_536_10902,searchweb201603_60,ppcSwitch_0&algo_expid=564f6870-7e32-471a-ba5a-ca6889d9b7fe-2&algo_pvid=564f6870-7e32-471a-ba5a-ca6889d9b7fe
In some forums, I have seen that encoders are connected to counters, however, I'm new to all of this, and I'm not sure if that would be the correct option for my encoder. Could you please give me some guidance on this subject?
Thank you!
I would start with the basic counter tutorial with DAC1 test signal:
https://labjack.com/support/software/applications/t-series/kipling/regis...
Then on that same page see "Connecting your Signal to a Counter" and see if you can count pulses from your encoder.
When you get it working you will see that you get an incrementing count regardless of whether your encoder moves right or left. You will get +1 count for 1 pulse in either direction. So now you want to look at quadrature:
https://labjack.com/support/datasheets/t-series/digital-io/extended-feat...