Questions tagged [test]
A definitive procedure that produces a test result.
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questions
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EMC and Control Area Networks [closed]
With radiated EMI tests, do we need to take into account the communication cabling and its influence on EMI?
I can't seem to find one standard that describes how CAN busses should be configured in EMI ...
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4
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Experimental and theoretical determination of MOSFET threshold voltage
I am working on a project that requires me to extract the proper value of the threshold voltage of a particular MOSFET.
I know that VT is quite arbitrary in its definition. I've researched the subject ...
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Determining specs for a power supply for a mystery motor
I have a set of 4 motors for an automatic backdrop system for a photographer studio.
How can I determine what I need to run these? They would normally come with a box with switches that operate them (...
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1
answer
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Synchronizing signal generators with shared LO
I'm currently trying to test my ADC chip using two signal generators. Below figure visually illustrates how the test setup would look like:
The traditional approach uses a 10 MHz reference port to ...
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0
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BL654 Bluetooth module Tx power issue
I am working on the BL654 module, and as per the datasheet, max Tx power of the module is 8dBm. But as per measurement, I found near to 6dBm power. Is there any issue regarding the power limit or ...
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How to achieve coherent sampling in practice
In the context of measuring a sinusoidal source with an ADC, coherent sampling (i.e. capturing an integer number of periods) allows the use of a rectangular window without spectral leakage.
How does ...
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2
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Do EMC test houses typically accept copper foil in EUT?
Working with small volume product and tight schedule it might become an option to pass EMI limits by use of copper/aluminium foil on inside of enclosure. What is your experience with the labs on this ...
0
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answers
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How can I test an LCD with an RGB port?
I want to test this LCD. When I connect its power, the message "no signal" appears on the screen. How can I send a simple signal to it for testing?
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ADC test techniques
Why do we need to test the features of an ADC like INL, DNL, offset, and error? And in addition AC specs like SNR, SINAD, THD, etc. These parameters are in the datasheet prepared by the manufacturer.
...
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2
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How do I establish if an op-amp is bad?
I have a JRC2374 SOIC8 IC on my board which is not powering up. The IC seems to be involved in the power regulation switching operation. Here are the internals from the datasheet:
I know little ...
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1
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LM4562 test not working
I got some LM4562 op-amps a few months ago and finally had time to test my audio project, and I realized that this schematic based on some others on the network is not working.
I tried to listen to ...
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2
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Capacitor decade box
I'm assembling a capacitor decade box. It will be used to tune circuits both in power & high frequency electronics (but, probably not GHz RF; with all the parasitics).
So, I need it to be as low ...
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How would I test forward voltage?
I tried to test an LED but my multimeter only displays 0L. Does anybody know what to do if it doesn’t have a select button?
2
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1
answer
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Why I am having x as output from ReLU?
I am trying to test ReLU, but it always gives 'x' for the output.
...
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0
answers
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RF test socket pin max power handling capability
Do RF test socket pins have a max RF test power handling capability specification?
Most RF pins that these sockets touch do have this specification. However, I don't see it listed for socket pins. ...
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Where can I find information about "Enhanced Policies and Procedures Exam" for IPC?
I'm taking the CSE test for IPC-J-STD-001 and at chapter 7.Certification Exam Overview, I can see that there are 3 types of tests.
Policy and procedure test (10 questions)
Closed book test (25 ...
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CPU test pins (test as a noun)
Looking at the FM2 socket for AMD processors I've noticed that there are some "test pins", i.e V22.
What are they for? Is it possible to manage them, i.e for some led signaling?
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How do I know that the isolation tester is doing its job?
I am measuring the isolation resistance of a device where the measured value is within the range of just measuring with the test probes hanging freely in open air.
1 kV gives values in gigaohm range.
...
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3
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Testing pulse drain current of a MOSFET
What's a good rig to test the pulse drain current of a MOSFET? I'm thinking using a gate driver very abruptly raise the \$V_{GS}\$ from 0 to the \$V_{GS\_max}\$ for the same period in time as in the ...
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Automated Hardware/Software Test
I am an Electrical Engineer and I don’t have a strong Software Engineering background.
My problem is: I need to test several Smart home devices. For example: a door that opens and closes (also 2 ...
0
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1
answer
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Hardware testing of the 1:1 connection for opens and shorts
I have a board (DUT = device under test), featuring (in addition to other things, which are not important for this question) 2 connectors - A and B. The connectors are connected 1:1 at the DUT.
...
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DIY transformer winding, "Light bulb test"
I "hack" cheap "electronic transformers" for use as filament supply for my tube amplifier projects. They operate at about 50KHz so there is no audible hum (a particularly annoying ...
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Electrochemical Gas Sensor Potentiostat Circuit
I guess this is more of a review request than a specific question, but I was wondering if anyone has any experience with electrochemical sensors and the required circuits for gaining accurate ...
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What is the most reliable way to test old capacitors?
I have a few old electrolytic capacitors from an old system that have not been used in many years.
I was thinking I might test them.
What is the best way to reliably test these old caps?
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Efficient discharge of capacitor voltage to 2-10 ohm DUT
I need to apply the voltage in a capacitor to a load (between 2 and 10 Ω) and need to have the most efficient and simple method to do so.
The goal is to apply power to a DUT (device under test), ...
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Clock network remains at x when applying fast clock frequencies
I am required to test how a design behaves if it is run with extremely fast clock frequencies (higher than the maximum frequency allowed by timing constraints). The goal is to detect what kind of ...
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Why is insulation resistance is bad when absorption Ratio ≈ 1 and insulation resistance is good when absorption Ratio >1.25 or 1.3?
i will do absorption Ratio (AR) test for transformers in my job,and i know how to calculate the absorption Ratio
AR=\$ \frac{R_{60}}{R_{30}}\$
\$ R_{60}\$=Insulation Resistance after 60 second test
\$ ...
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What do you test when changing parts [closed]
Let's say some parts within one of your products are discontinued. You already have a replacement that seems to fit from specifications. What tests do you usually conduct to verify proper operation? ...
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How to select an appropriate tone spacing for intermodulation distortion testing?
Intermodulation distortion measurements require (at least) two closely spaced carriers combined before going into the DUT. I understand the basic theory but have not grasped the effect of the choice ...
0
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4
answers
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Measuring Li-ion battery manage to get a number in mAh
How can a circuit functioning to measure Li-ion or else type battery manage to get its mAh capacity, how is this circuit's method ?
EDIT
Known it from a reviewer fed into an e-commerce site I forget (...
user285744
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LED check circuit on startup
I wanted to use a sensor which should indicate low fluid level with a LED.
I don’t want to have a non working LED in that circuit and want it to be automatically checked everytime the circuit powers ...
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Soldered test point on production board?
I understand having test points on a production board, but what would be the point of selectively soldering some of them? It doesn't modify any resistance, right?
I assume that the large numbers of ...
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1
answer
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Building custom hardware for programming boards with microcontrollers
I have a PCBA that includes a MSP430 microcontroller and another module. The connection is shown in the photo below where the former (MSP430) is at the bottom and the top is for the other module.
...
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How to program MCUs and test PCBs in mass production?
I am working on a PCB which includes an microcontroller (STM32), some sensors and a BLE module. Right now it is still a prototype, only 3 units have been produced.
To program the microcontroller, I ...
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Identify live or neutral in 2-way switch
I have a 2-way switch connecting to a light and it works properly. When opening it up, it has 3 inputs with the same wire color. I don't know the setup and I wish to know if there is a neutral in one ...
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1
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How to go about debugging PCB Power Supply Circuits to ensure correct output voltage?
I'm currently soldering, testing and validating the components on this PCB that I designed a few months back.
As it is right now I have soldered the 1.2V, 2.5V, 3.3V and 5V buck converter power ...
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How can we test the lifespan of electrical components?
We work with some electronic devices in our projects. We are at the stage where we need to create some test strategy to validate the lifespan (e.g. 1 to 5 years) of our devices for which we provide ...
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How can I test whether my 3 wire electric motor is broken? [duplicate]
I have a motor that I'm trying to work out if it's faulty or not. The motor make and model is EMC RB2C-190-060 K010 (photos below) -
230V
~ 50/60 Hz
2μF-450V
65/90W
0.3/0.4A
The motor has four wires ...
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1
answer
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Vdd rise test in real life
I want to simulate VDD rise. For example I want to raise 1.2V VDD to 4-5 Volts for tens of microseconds and lower back to 1.2V. Suppose I have a high rise and fall time pulse generator (200-500 ...
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How to troubleshoot low-voltage home lighting system from 50s
My home, built in the 50s, has a Sierra low-voltage lighting system, where low-voltage 24DC switches control relays that power the normal 120AC lights. In the last week, the switches have failed ...
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2
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Measuring the capacity of a 40v lithium ion, lawnmower battery
I purchased a 40v Greenworks lawnmower battery, and it's listed capacity (6,000 mah) doesn't seem to be accurate based on what I'd expect to get out of it when mowing a lawn.
How would you go about ...
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2
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Noob soldering help: test pad repair
So I haven't soldered in years and only have experience with through hole soldering and large components. Today I attempted a repair with a HTC Vive controller. I know where to solder and managed to ...
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MC1314 voltage controlled attenuator circuit not working on breadboard - what did I do wrong?
I have an old quadraphonic system with a problem that I've traced to what I think is an MC1314. (That's not the question.) So I ordered a replacement, popped in and it didn't solve the problem. I ...
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Vector Network Analyzers: Bode100 vs Keysight P5000A
I have been using Bode 100 machine earlier to measure Impedance and Phase of my piezoelectric transducer.
The frequency range i work in is from 10kHz to 2.5MHz.
I was just comparing this Bode100 with ...
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2
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How to run double main in same project? [closed]
I imported unity test harness to my project and seperated them from my production codes. As you know, there is a main belongs to my project and there should be another main to run tests. If I try to ...
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The choice of method for constructing hardware monitoring and diagnostics
created a weight scale device.
I chose the software method for diagnosing my system. How can I implement it?
X1 is a load cell 5000 grams
DA2 HX711
D1 Atmeaga328
D2 shift register
H1 lcd display ...
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answer
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Built in Self Test - In Embedded memories
I am reading this thing called -BIST (Built in Self Test).
I understand that, before a module enters its intended functionality, this BIST is made to run within the module. Once, this BIST is passed, ...
user220456
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7
answers
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Testing process before PCB assembly
I have a specific question regarding test and verification of circuits on PCBs such as the following one:
Since I am not from the electronics industry and never been in such a place I thought someone ...
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3
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How to test desert (Dubai-like) conditions when you are in a temperate climate
I would like to stress test an electronics device in desert (think it like Dubai) conditions, such as 40-45 degrees Celsius = 100+ degrees Fahrenheit with direct sunlight and zero humidity. I live in ...
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How do I make a battery voltage indicator using the battery being tested?
I am trying to make a circuit that will test if a 5V battery is under 5V, with the testing circuit running off the battery being tested.
I have seen other answers to this question, however they rely ...
