Questions tagged [data-acquisition]

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Accessing data from a ddr3

I'am working on a new projet where I'm willing to access data from a ram, but the ram's specs is that they work with a frequency up to 667MHz , so I decided to choose an FPGA to work as controller ...
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Power Analyzer N6705C ELOG query returns empty

I am attempting to use the external data logger (ELOG) of an N6705C to record voltage & current, then pull the measurements from the data buffer. When I use the below SCPI sequence it runs without ...
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How to transfer data from high-speed ADCs in MCUs?

Some MCUs contain multiple high spped ADCs, e.g. STM32F303 has multiple 12 bit, 5 MSPS ADCs. Let’s say I am using just one of these to sample a signal. Because 12 bits will be represented/stored as 16 ...
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What is happening when a signal is acquired at exactly Nyquist frequency?

So I am doing some some simulations with 1V sinusoidal signals, and a 1 second acquisition at sampling frequency of 100 kHz. Now I am slowly increasing the frequency of the sinusoidal signal. Trying 1 ...
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Confusion with trigger controlled analogue output of a DAQ board

I came across this article, and regarding the DAQ trigger and analogue output part I'm confused. If I don't get it wrong the DAQ generates particular analogue voltage levels for X and Y of the galvo-...
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How does this scan camera send data to a computer?

I am reading the data sheet of this scan camera (mono version.) My aim is to process the data coming from this camera by programming a simple software (using either CPU or GPU.) I see that it uses a ...
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How is CCD data converted to frames in practice?

After reading this article I noticed that one can sample CCD by an ADC and convert the signal waveform to image since each pixel's color is function of ADC sample. Lets say we can sample this CCD ...
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Is one RLD electrode enough for multichannel ECG acquisition system?

I am trying to design the multichannel ECG measuring device. My device has to acquire 3 signals at the same time. I have to use 6 electrodes to be able to measure those signals. My problem is each ...
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Using plain connectors on thermocouple / external cold junction compensation

We'd like to use plain automotive connectors to connect our thermocouples. What we are looking for is the ruggedness and economy of such connectors. Of course, that brings the problem of material ...
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Measure ball speed with sensor inside

I came across a product which is a ball with a small Bluetooth sensor placed inside. This sensor, coupled with an app, can measure ball speed, height and length of throw. I wonder how this is possible,...
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NI myDAQ behaving weird, not measuring inputs after some random time period

I am using the National Instruments myDAQ with MATLAB (using the Data Acquisition Toolbox) to generate a sine wave at defined frequencies at one of the output channels. The output channel is (...
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MCU or other boards with 100 MS/s ADC [closed]

Are there any commercially available microcontrollers or SoC or SBC boards with integrated ADC that can do a sampling at 100 to 150MS/s. Looking for making a high speed and economic data capture ...
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Why are we printing alarm in compact data logger?

I understood most of the things of compact data logger but could not understand why are we printing alarm? And how is that possible to print alarm? Can you share? Also why is there 2 way communication ...
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Are data acquisition system and 'microcomputer on instrumentation design" and data logger the same thing? [closed]

This is data logger-: This is data acquisition system-: This is "micrcomputer on instrumentation design" All 3 look quite similar. What is the difference between each of them? Sadly, ...
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MIPI Bridge 2.5Gbps or Above [closed]

I was looking for some MIPI bridge solution and mostly found MIPI to LVDS Bridge. But the problem with LVDS is that it can't support more than 1.2Gbps. I was looking for some solution which can ...
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OPA344NA op-amp MEMS Mic

I'm planning on getting Audio Data from a MEMS Analog Microphone with an OPA344Nna as the OP-AMP. I'd like to just make sure the audio circuit looks correct. (Analog/Audio is something a bit new to me,...
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Help designing a data acquisition module

I'm prototyping a shoe that reads the pressure distribution of a person's weight as they walk. In order to accomplish this, I need to design a Data Acquisition circuit board that will be compatible ...
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Minimum voltage reference for ADC

I am looking to measure very low voltage signal (0-0.5V range) and was wondering if it is possible without amplification. I am a bit confused about what the minimum references of ADC can be. Looking ...
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How to design a data logger?

Signals from three transducers are to be recorded in data logger. The analogue signal supplied by the three transducers are dual polarity (-50 mV to +50 mV) having frequency is 5 kHz, 10 kHz and 15 ...
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Would analog data loggers record PCB 353b33 accelerometer datapoints for a minute or more?

I'm currently recording data points from an analog accelerometer (PCB 353B33) using a TDS3014B oscilloscope which has a record length of 10,000 points at a sample rate of 1.25 GSa/s. Since the ...
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How would I build a data acquisition system for SiPMs?

I try to build a radiation detector using of an arrangement of silicon photomultipliers (SiPMs) coupled to a scintillator and I want to read out the number of photons recorded by each SiPM sensor. I ...
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Oscilloscope can't save data to disk fast enough

I am using an oscilloscope from LeCroy and am confused as to how to have the scope sample and write data to disk at 1kHz. When I run the Low-Speed Measurement Data Logger Script which would make the ...
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1 answer
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Is there a way to set different sampling frequencies to channels in ADS1256?

In order to acquire 3 analog signals with a Raspberry Pi 4, I want to use Waveshare's ADS1256 AD expansion board (8 channels single-ended, 24 bit.) I was wondering if there's a way to set a different ...
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1 vote
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Send or share DI data through network advice

i want to collect some data(DIs from some relays) and send them or use them in a network and finally put them in a DataBase like SQL, and i want it to work 24/7. after searching i found some solutions ...
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Which is more efficient: every loop or afterwards?

Planning to collect some sensor data with an Arduino (or ESP32) and looking through other people's code I noticed two variants, generally, to process sensor data. Collect, average and subtract some ...
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1 vote
1 answer
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Real-time vs Non-Real time ADC processing

What are the applications or Pros/Cons of using real-time vs non-real time when reading an ADC? For example, let's say you're reading a sine wave from a CT. As far as I know, if you’re processing in ...
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Why the power line interference harmonics appear gaussian?

I have a recorded signal from a data acquisition system. I am getting this noise in my signal: The picture shows the FFT of the signal. I checked the frequencies of the noise and they are 50 Hz apart ...
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ADS1115: Protection circuit for ADC input

I am using an ADS1115 for measuring DC analog voltage in range of 0-10V.(Sensor output range) I am using thr IC in single ended input configuration and continuous conversion mode with FSR= 6.144 and ...
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1 answer
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About best way to perfom checksum

From my knowledge,checksum can be done using Xor or adding the bytes of the frame...i have to create a communication between ATmega32 microcontroller and matlab to perform some functions...which is ...
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Why isn't my PC recognizing my serial stream from my Arduino Uno?

I installed the instrument control package to Octave and have the Arduino IDE sending a single character to the computer every 100 ms. The device is transmitting on COM3 but the software still doesn't ...
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1 answer
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Software oscilloscope

I have been developing a C language software for software oscilloscope which is part of a control software. From timing point of view the software consists of two execution loops. The first execution ...
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Settling time of DAQ 6229

i have NI 6229 DAQ and datasheet and i come up across the settling time versus time for different source impedances i would know how is settling time calculated? i was thinking a simple RC network ...
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Is there a difference between these device terms?

Is the term "High-Speed Digitizer" same as saying "data acquisition device with high sampling rate"? The definiton I encounter for a digitizer is: " A digitizer is a hardware device that receives ...
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ΔΣ ADC Programmable Gain Without Amplifier

There are some ΔΣ ADCs of which one can set an input referred gain. Like if there was a PGA between the input and the ADC, but in fact, there seems to be no PGA between the ADC and the inputs but ...
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1 answer
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How to do multichannel ADC data logging

I need to build a system to monitor several (around ~20) voltages over several days. The ~20 voltages need to be measured differentially. Something which could in theory be accomplishes with 3 of ...
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2 votes
3 answers
645 views

Finding equation of curve for NTC type thermistor [closed]

I have an NTC thermistor from the KTM 390 engine which I am trying to interface with the Arduino MEGA. The problem is the sensor has no datasheet. I have got the relation between the temperature vs ...
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1 answer
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Is it a good idea to connect ethernet cable's shielding to PCB GND?

Background My project is split over two PCBs for convenience. The first PCB adapts an input signal and converts it to a low-voltage differential signal. There are 4 channels to be measured, so 4 ...
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Why is this load resistor connected this way and what could be its value?

There is a potentiometer vane and the diagram includes protection components and looks messy, I simplified it by re-drawing as below: The circle R1, R2, R3 and the gap represents the vane's 10k ...
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6 votes
4 answers
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Need a method for synchronization of galvanically separated microcontrollers

I would like to get some ideas for my problem. I have a HW which has a main processing unit (Beaglebone, host controller) which is connected to four galvanically seperated STM32 microcontrollers. All ...
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5 votes
2 answers
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Why Do Pipeline ADCs have an "Overlap Bit"?

In pipeline ADCs, there is an amplifier after each stage that amplifiers the remainder of the previous stage by 2^(number of previous stage bits - 1). For example, if the flash ADC in the first stage ...
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3 votes
3 answers
377 views

How Can the Quantization Noise of an ADC be Measured using the Digital Output?

The ADC quantization noise is the error signal generated by rounding the sampled analog values of signal. Suppose that we have the digital output of an ADC, how can we measure the quantization noise, ...
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1 vote
2 answers
296 views

Sharing a single ground wire across multiple RTDs

Consider the following, simplified schematic for a single, two-wire RTD sensor: simulate this circuit – Schematic created using CircuitLab The two wires from the RTD sensor plug into pins 1 ...
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6 votes
2 answers
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ADC / data acquisition board - general layout question

For one of my current projects, I am designing a small data acquisition board. However, I am currently not sure about the overall layout of the board. Here are 2 possible variants I came up with. ...
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What could be the reason for these bands in this data acquisition measurement?

Here is zoomed view of 16 channel The first plot looks very peculiar to me hence there are like two forbidden bands(looks like white lines as you see). This also appears if I plot any individual ...
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How to measure or estimate the phase delay between two analog input channels of this board?

There is a 16-bit data acquisition board with +/-10V range which multiplexes analog inputs and buffers the data to the PC. Specifications are given here (DAS6036 is the model in question). Now I need ...
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Whenever two system or sources are coupled they should have same current sink or common reference point (say ground). How to realize this in ECG?

Electrode (Ag-AgCl) are placed at different part and directly fed to positive and negative input of differential amplifier. How can we realize human body and amplifying system have same current sink ...
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2 answers
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Is only a firmware limitation the fact that some camera can't store photo in RAW format? [closed]

I was interested in understanding if from the point of electrical engineering storing the RAW data of the sensor directly into the memory of the camera require special hardware. Could be more ...
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Practical method to measure a data acquisition board's noise floor

Noise floor of a 16 bit system is usually within a few dB of 96 dB. And this is because 20*log10(2^16) = 96dB But I guess this is the theoretical quantization noise floor. So if this was the only ...
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5 votes
5 answers
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Processing ADC conversion result: DMA vs Processor Registers

I have a periodic ADC conversion (every 50 micro-seconds) and I use the result to do some further calculations and update the PWM load registers. The ADC is triggered by the up-down counter of ...
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1 vote
0 answers
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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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