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Questions tagged [data-acquisition]

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2answers
35 views

Comparing two imbalanced signal transmission

Below shows a perfectly balanced system assuming cables are balanced and twisted: Im wondering if the transmitter is not impedance balanced, would a balanced receiver reject CM interference still ...
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1answer
99 views

Noise due to stray voltages in a data acquisition system

A single ended earth grounded data-acq. board on the left in the below illustration has inputs coupled by BNC cables coming from force transducer amplifiers A1, A2, A3, A4 as shown on the right: If ...
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1answer
126 views

How to interpret this CAN bus data and find an equation?

I am trying to reverse engineer the data sent from an old CAN bus data logger. It sends a single ID which is selectable from a dip switch. The only bit of data I am struggling with is the RPM I plan ...
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1answer
121 views

Oscilloscope stop getting data

I have a Rigol DS1000Z, and I'm using it to sort of log data. I have a wavelength tunable laser that creates an electrical pulse (start of pulse is start of sweep, end of pulse is end of sweep), and ...
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1answer
45 views

Is there a problem connecting PSU grounds to earth for an isolated signal chain in this scenario?

For a precision and simultaneous analog signal data acquisition; several force, temperature and acceleration transducer outputs are coupled to a daq board input channels through signal conditioning ...
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1answer
67 views

Are there any benefits to amplify the signal for this case?

A force transducer together with its amplifier designed for a full scale load such that it has -5V to +5V range as output. But it is only used with loads outputting -200mV to +200mV. A data ...
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1answer
37 views

Holding signal true for x seconds in LabView

I'm trying to create an automatic startup override system whereby when an ESD override button is clicked, a signal will be held true for 10 seconds overriding my ESD interlocks. This seems like there ...
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1answer
28 views

Investigating the cause of the drift for this system

A force-torque transducer data acquisition system is shown below: As shown in the above illustration, basically a six-axis transducer is powered and amplified by an interface electronics and then the ...
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1answer
51 views

Experimenting interference effects for different measurement systems

This is about for low level signals interference/noise being observed with single ended data acquisition inputs but not with diff inputs. Basically there are three data acquisition boards, where one ...
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1answer
77 views

How to explain this solution to the common-mode voltages?

One of my previous question revealed that a variable voltage test device's power supply which is an AC/DC adapter, and is SMPS type which causes common-mode voltages. A solution given by tying the ...
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1answer
119 views

Using differential and single-ended inputs simultaneously in a data acquisition system

Below is the wiring setup I plan to use: Basically the black rectangle in the middle is this data-acquisition board which has 16 diff ended inputs. The blue rectangle on the left is a six-axis ...
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1answer
188 views

is it possible to design a SD 3.0 controller in UHS-ii/uhs-i mode using simplified specifications?

I've been for while looking to store a sampled data up to the rate of 30MBytes/s, an SD 3.0 host controller core in uhs-ii/uhs-i mode fits the requirements. i'm not planning to buy SD full spec and ...
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1answer
31 views

Reverse Polarity Protection for DAQ box

Firstly, I am a ME seeking advice from EE's. I have a Quadvolt voltage data acquisition box from Omega (P/N: OM-CP-QUADVOLT-30V) http://www.omega.com/pptst/OM-CP-QUADVOLT.html, that I intend on using ...
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1answer
62 views

Worried about channel ghosting in DAQ system - Need unit gain buffer?

I am working on a redesign of a test box we have at work. There is a transmitter that is sending data to a recording system (in my case the dewetron trendcorder with Trion BNC modules). We previously ...
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0answers
34 views

Reliable methods to read data off a flash chip?

I'm trying to read data off of flash chips on a variety of embedded devices I have, and I'm currently using an FTDI FT2232H and flashrom (with soic-8 clips and probes) to extract the data as they are ...
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0answers
68 views

How can I estimate the minimum baudrate for a given bitrate?

My circuit performs data acquisition at 250 samples/s, 24 bits/sample and transmit this information to the local host (PC) through a bluetooth module that implements the UART protocol. As far as I ...
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0answers
88 views

ADXL343 data read

I am using a ADXL343 accelerometer in one of my designs and I am getting strange readings from the device. Just to be sure, I would like to confirm that I am formatting the data properly. (I get the ...
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0answers
49 views

Question about noise effects of parasitic common-mode coupling in a single ended system

This question is related to a previous question. Now I'm trying to understand a bit deeper about the phenomenon I will present. (to see bigger view please left click) To make it clear enough I used ...
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0answers
40 views

Should I daisy chain start connect or wire separately?

This is related to field wiring schemes and interference. Sometimes tens of transducers are needed to be coupled to a single-ended data acquisition board's analog input channels where the transducers ...
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0answers
44 views

Question about earth grounds for remote control of VFD via a DAQ system

A single-ended earth grounded PCI data acquisition board's analog inputs and outputs are controlled by a PC. The daq board has also analog outputs. One of the analog output is controlling the motor ...