Questions tagged [daq]
Abbreviation of Data Acquisition system (aka DAS)
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Instrumentation Amplifier and differential ADC Arduino Mega
I am working on an acquisition system, which measures tension and compression in a load cell. I amplify the signal with the Instrumentation Amplifier INA128P, and after that I connect it to the ...
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Stepping up current of PWM control signal for DC motor control?
I am a controls engineer with little background in electronics, so forgive me if this is a simple question. I am trying to figure out a simple and reliable way I can implement PWM speed control on ...
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0-10V or 4-20mA conversion to 0-3.3V for Microcontroller ADC
I'm building an electronic project that will have hybrid analog input (can accept both 0-10V or 4-20mA).
The user can use jumpers to select the desired mode, which is either 0-10V or 4-20mA.
My ...
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Large channel count (100+) measurement solution? [closed]
I am a mechanical engineer by trade, so please correct my assumptions if they are wrong. I'm designing a test rig for my company's electrolyzer design. The electrolyzer will have anywhere from 128-200 ...
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Data collection: two different scopes, same number of points, different time span
In my experiment I am collecting data from 2 oscilloscopes (both Tektronix, MDO3024 and TBS2000B).
I am using all channels in both scopes, so 8 channels of data (3 x current, 1 x pwm, 3 x voltage and ...
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Instrumentation Amp Error Budget... now what?
Bit of a pre-amble before going into the question. I'm working on a project to try and get 100mg worth of resolution out of a 5kg load cell, and I am trying to figure out if my current approach is a ...
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How do data acquisition systems work?
This is a theoretical question.
All the signal processing electronic systems I have developed up to now have customized electronics to filter out unwanted noise.
Because their electronic filters are ...
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Wiring of INA128 instrumentation amplifier to Wheatstone bridge
Is there any issue with the wiring or calculations of my INA128 instrumentation amplifier to my load cell Wheatstone bridge? Currently I see no change in the output when connected to the oscilloscope. ...
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Negative offset voltage on analog input in data acquisition device (DAQ) connected to a photodiode in the dark
I have a data acquisition device (DAQ): USB-6002 from National Instruments (NI). I am recording an analog voltage from a (cathode-grounded) photodiode through a variable resistance (50-100k Ohms).
I ...
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What model or brand, for test equipment of lots of IO's [closed]
Can someone give me a type or a brand of test equipment.
I need something bigger and possibly faster than what I am currently using which is :
test 8 pcb's and simulate a machine all at the same time ...
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34401A Remote Measurement Time
I am using an HP 34401A as an ADC for data acquisition. I am triggering the device within a 'for' loop in MATLAB, so that I can synchronize the measurement with a separate device. I am able to collect ...
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Signal conditioning of a piezoelectric sensor
I am currently working on a project that involves the use of a piezoelectric sensor which is of the ceramic type and produces charge when a force is applied. I want to convert this charge to a voltage ...
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Raspberry Pi DAQHAT: Overvoltage issue
I am working on development for a piece of HV test equipment, where I need to monitor the voltage output for a circuit that is actively arcing.
I am measuring the voltage off of a Raspberry Pi DAQHAT (...
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Am I correct that this digital IO protection diode choice doesn't make sense?
I'm currently redesigning a breakout board for an expensive FPGA data acquisition device we work with frequently. The designer of the past version added some components between the FPGA's digital IO (...
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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 ...
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Current transformer to DAQ
I'm using a MCC 128 HAT DAQ on top of a Raspberry Pi. I'm reading the output from an AT-50-B10 current transformer that's around the mains cable (UK) that's powering the Pi & monitor.
I'm ...
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Circuit from NI DAQ 6001 to push button
I need to design a circuit with a NI DAQ 6001 and 3 push buttons. I don't know any design software, so I just drew by hand. I can give an explanation for you to understand.
Pins 1, 2, and 3 are ...
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3.5mm pluggable screw terminal, but male side PCB mount
I have a few NI USB-6000 DAQs with a 3.5mm pluggable screw terminal. I want to used them in battery prototyping so I'll need to build a few unity gain differential opamps for cell voltage monitoring ...
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Volt/load meter - DAQ question
I have an analog output from a FANUC Variable Frequency Drive that gives a voltage in the range 0-10v depending on the load. I've cut & paste the relevant parts of the manual below.
I would like ...
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What is the true measurement duration for each sample made by a DAQ?
When a data acquisition system digitizer (DAQ,) or analog-to-digital converter (ADC) samples a continuous signal, how can one estimate the true measurement duration of the sampling action? By true ...
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Wheatstone bridge analysis
Hello,
I am facing issues in calculating few parameters for the following information. I am new to this concept of strain gauge, wheatstone bridge, and data acquisition system
Four resistive strain ...
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DAQ sound acquisition
I have a simple USB DAQ device (datasheet). I was hoping that with differential voltage I would be able to measure simple sounds and convert/store them as a simple audio file (e.g. WAV, MP3). I see ...
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Using 5V output from an Adafruit SHT40 humidity sensor with DAQ system
Using the setup guide for the SHT40, the only way I can get humidity and temperature from the SHT40 sensor is to hook it up to an Arduino and interpret the data coming from the SDL and SCA pins with ...
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What is the size of the variables declared as macros in C Programming?
I am currently trying to receive and process serial data from an STM32F401CCU6. I am receiving binary data from the STM over USB and I would like to re-assemble the raw data into what was originally ...
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Connecting ultrasonic transducer to PC (Data Acquisition) [closed]
I'm working on one project and need some guidance.
I aim to connect an ultrasonic transducer placed on the pipe to the PC so that I can acquire the data and then process it using Python.
I did some ...
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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 ...
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Minimize the quantization error of transducer and DAQ
Can somebody please let me know how to solve this problem:
A 12-bit A/D converter has an input range of ± 10 V and is connected to an input amplifier with a programmable gain of 1, 10, 100, or 500. ...
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Where to connect case/USB shield to PCB ground?
I am currently designing a modular device for signal acquisition and signal generation. This is not a professional/commercial device. I am only building it out of interest and to learn.
Nevertheless, ...
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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. ...
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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 ...
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DAQ analog output signal becomes distorted when connected to resistor. Why?
I am an undergraduate student in electrical engineering. I just started working with a DAQ (PCIe 6341 connected to SCB68A) which can output analog signals (sine, triangular, square.)
When I output 2 ...
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How to measure bit resolution
I have a system that has a bit resolution of 1.9uV (gain 20), to increase the bit resolution the gain stage was increased at the input of 180V/V which lowers the effective bit resolution to 0.21uV.
I ...
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Creating AC magnetic field with DAQ card [closed]
I'm a second year student in electrical engineering. For my project, I am working with magnetic nanoparticles and I need to set up an AC magnetic field.
My plan is to build a solenoid (~1200 turns, 10 ...
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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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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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How do I wire five pressure transmitters at the same voltage into a DAQ?
I want to collect pressure readings using 5 analog pressure sensors powered by a battery and collected with a DAQ. My sensors require 10 - 36 VDC and draw 38 mA max with 4 - 20 mA output. My battery ...
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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 ...
