Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [data-acquisition]

100 questions
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What is the "Nyquist" rate for sampling the derivative of a signal?

Background: I'm sampling the current through a capacitor. The signal of interest is the voltage across the capacitor. I will digitally integrate the current measurement to obtain the voltage. Question: Given that the voltage across the capacitor is…
VIANDERN
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Is star grounding sources necessary for this data acquisition system?

Several single ended output and PSU powered transducers are tens of meters apart from each other outputting 0 to 10V DC like voltages. Some are temperature transducers some are force transducers ect. Their outputs all go to a single DAQ board which…
floppy380
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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 of the STM32 microcontrollers are doing analog…
D_Dog
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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. First of all, the position of the connectors is…
KarlKarlsom
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How is binary data 'split'?

If one computer sends data, for example 001101, how does the other computer know, where one bit starts and the other one ends? If you were just to monitor the change, you would get 0101, which is totally inaccurate. Is it just a timing thing? (I…
Some Guy
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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 is 3-bit, the remainder is amplified by a factor…
Alex L
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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 hardware PWM and has to be done exactly at that time. I…
Firat.Berk.Cakar
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Streaming 30 MByte/s into a PC using an FT232H?

I want to bring a continuous 30 MByte/s stream of 8-bit values from parallel-output ADC (AD9283) into the memory of a standard PC (laptop under Windows 10 if possible). My software does real-time analysis and logging of relevant events. Some latency…
fgrieu
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Re-wiring experimental apparatus: Questions regarding proper ground, DC power supplies, and precision instrumentation

The apparatus consists of a large metal spherical chamber attached to a metal table. There are two electrical enclosures bolted to the table legs. The chamber is outfitted with multiple servomotors, each driven by an independent servo amplifier.…
cmv
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ADC throughput calculation

I was studying ADC basics from this document, AVR127: Understanding ADC Parameters. I have a question regarding the throughput calculation. The document reads, Consider the case of single-ended conversion where one conversion takes 13 ADC clock…
Hari
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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, only using the digital data, and without…
Alex L
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Confusion with different recommendations about wiring floating single-ended output sources to differential inputs

I'm trying to configure single-ended floating sources to differential inputs of this data acquisition board which of course uses an instrumentation amplifier and have differential inputs. So I had to figure out what are the recommendations for…
GNZ
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Help me understand this mystery data acquisition circuit

Can someone please help me understand this mystery data acquisition circuit. The circuit is both powered and digital data are communicated using a single wire. Current return is made through chassis. Special interface board must be used to operate…
FieryFire
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Logging data from High Precision AD/DA board using Raspberry Pi 3B

I have a High Precision AD/DA board from waveshare with Raspberry Pi 3B (running on Raspbian). However, I can write only 27 samples in 1s in my CSV file. I am using this Python code for writing to a CSV file. It seems my code is not optimized for…
Varun Dhankhar
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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 change and cold junction compensation. Since we…
VoltsAndNuts
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