Questions tagged [testing]

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How is a robust test also a non-robust test?

I found the last line of this slide quite confusing. How is a robust test also a non-robust test? Can anyone elaborate? Using path sensitization and any other criteria, I am not able to relate both of ...
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Cispr/EU testing: Large Loop Antenna System vs 60cm Loop antenna

I want to be able to do some pre-testing to EU standards, and I am not able to find clear information regarding the proper test equipment. From what I've read in an older version of the Cispr15 ...
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How to test TF02 pro (rs485) LIDAR sensor

I have a tf02 Luna pro (RS485 version). I would like to test whether this sensor works or not. There are 2 possible test I can think of I can do. First is to use an RS485 to USB converter I had lying ...
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Regarding validity of the EMC/EMI & safety test reports containing withdrawn IEC Standards for CE & UKCA declaration

I do have a question regarding the validity of the EMI/EMC & Safety test reports of the products which do have the withdrawn IEC standards. Like for an Example: If we do have tested the products ...
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How to measure energy usage from a 12V battery over a daily pump cycle

I am working on a project right now where two different DC water pumps are being powered by a single 12V DC battery. I am trying to do some performance testing to find how much energy from the battery ...
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What type of connector can I use for repetitive testing of board with standard headers?

What type of connector (besides the regular female counterpart) could be used for repetitive connection/disconnection of these pins in circuit boards? The problem with using the regular female ...
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Does a phototransistor have a minimum focal window? - Velocity Measurement of High Speed Object

My goal is to measure the velocity of a moving object that has several different changes in velocity throughout the actuation. I am planning on using a phototransistor to detect black and white lines ...
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How do you do back-voltage testing on USB 3.0?

There is official documentation (Appendix F) on how to do compliance testing on USB 2.0 devices to ensure there is no back-voltage to hosts. Is there an analogous test for USB 3.0? My assumption would ...
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Controller anti-windup test cases

I am trying to implement my own (simplified) PI block for digital controller and would like to include anti-windup function. A basic structure for PID controller with back calculation is given below: ...
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Is low humidity bad for HIPOT testing electrical harnesses?

From what I understand for HIPOT testing high humidity could be a potential issue because if cable insulators absorb moisture that could affect their resistance. What about low humidity? Is there any ...
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2 votes
1 answer
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Testing of HF transformer designed for phase shift full bridge converter(PSFB)

I have designed an HF transformer for a PSFB converter. Specs: Peak Primary Voltage = 800 V Peak Secondary Voltage = 176 V Turns ratio Np:Ns = 18:4 Primary Irms current = 12.38 A Secondary rms ...
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Spurious measurements FCC

I was wondering if someone can help me with a project at work. I am very very new into RF. I work for an EMC/EMI lab and we want to do some spurious emissions testing and establish a test procedure ...
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How to test for PCB ground being pulled up to 2V when connected to RS485

I am currently trying to find an easy way test to diagnose a problem on some of our PCBs where the ground of the PCB is being pulled up to 2V's. The Board Simple modular RS485 sensor board. The main ...
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How can a cable tester verify correct shielding/twisting of wires?

Background: The company I work for makes a variety of special-purpose cable assemblies to go with equipment we make. The people who build these cables aren't doing a 100% reliable job, and nobody ...
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Double pulse test time interval [closed]

Keeping all other parameters (like DC bus voltage, Bus capacitance, Inductor value, etc.) fixed, and only changing the time interval between the two pulses, why would there be a difference in the peak ...
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How do you pass Insulation Testing when your load is low impedance?

This is probably a silly question but I read that for class I equipment I need to perform insulation resistance tests and it must be under 1 megaohm. My understanding is that one of these tests ...
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A possible shot in the dark - Seaward HAL-104 Tester experience?

This post might be a shot in the dark, but has anyone here had any experience with the Seaward HAL-104 tester and its remote command protocol functionality? Or perhaps know someone who has? There is ...
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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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12 VDC test stand for 280 A (Start-up) @ 100 A continuous air compressor

I am working out a test stand that will use two Murata power supplies in parallel with this board to drive an air compressor rated at 100 A continuous and a start amp draw (momentary) of up to 280 A. ...
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Reason for using short leads with capacitor tester?

When I was a high school freshman many moons ago, I took an electronics course. When the instructor introduced capacitors and how to test them, we used meters that had very short (3 inches or so long) ...
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Antennas for beginners

I am making a board with the tellit ME310 LTE/GPS chip. I have layout with 50om impedance planned and via stitching and all the guide recommended pieces. I have never really worked with antennas ...
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1 answer
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Testing results by running scripts on test equipment

In the context of testing circuits using oscilloscopes, what does it mean by running scripts and taking the measurements and results of the circuits? Has anyone tried to take results like running ...
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3 phase generator coil winding testing [duplicate]

can some one help in testing methods of the stator and coil windings?
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2 answers
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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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3 votes
1 answer
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Gate driver output 25% of PWM frequency - any idea how this is possible?

I am testing isolated gate driver IRS10752LPBF on the bench and I have a result I don't understand. The only change I made on my test rig compared to the typical application proposed in the datasheet ...
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How to go about testing which pins to short to turn on Daly BMS?

I have a 7S DALY BMS, but I forgot to buy the 'SOC (state of charge) display board', which has LEDs that display the state of charge, and crucially, a switch to turn on the battery itself. The board ...
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How are system level test requiring use of common lab bench equipment usually implemented?

Assume that a system level test setup needs to be created for a design. This shall require use of power supply with multiple outputs, signal sources that can output sinusoidal or arbitrary signals and ...
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Should I ground my 5V USB dc output for user safety? - Product design

The project consists of a metallic bench that can be placed outdoors, with a couple of USB outputs to charge your mobile on the go. The bench is grounded (bonded with our internal connection box, ...
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How to fix low LED light?

I've connected my LED to 1K resistor. When I tested it out on a breadboard it worked fine, the LED was very bright. Now, when I soldered it to the board, the LED light is poor. I did everything the ...
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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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4 answers
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„Power circle“ - first buck then boost for converter testing

I would like to test the efficiency of some buck converters. I am thinking of using two current sensors like INA219 (or similar) connected to an Arduino and using the serial monitor to gather data. ...
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2 answers
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How can I test the rotor winding of a single phase brushless alternator on a generator?

Context Generator runs but no power output from the alternator. The manual gives Ohm readings for the stator, excitation and rotor windings. The stator and excitation coil are to spec and have no ...
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Safely tripping a newly bought circuit breaker to make sure it works

As the title suggests. I recently bought two circuit breakers as a means of protection for a little project of mine. One's a 60A, and the other's an 80A. I've already tested it to make sure that power ...
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Transformer Open-Circuit & Short-Circuit Tests

I need to find the losses of a transformer through simulation. I am measuring voltage, current & power. I know the method to find the losses but I am unsure if I should use the rms or peak values ...
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4 answers
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Steps to test and assemble PCB

I have a project that required for me to assemble and test a PCB. I need some help for how I start and the steps to do everything. Now I do have a multimeter and I have the parts with the PCB. This ...
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2 answers
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Vibration test failure

I have designed a power supply card using V7805-2000. Copper thickness is 70 microns, board size is 5 cm × 5 cm. When this underwent vibration test the regulator came off, broken into two pieces(...
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Differential Signal Measurement best practice

I have 4 differential signal pairs (LVDS Data lines and Clock) running between my Microcontroller and TFT. There are no test points over the lines. Can someone tell me what is the best practice and ...
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How to transfer blocks of data into FPGA to aid in testing?

How can one transfer data from PC to FPGA and read back result for test purpose where the data must not get corrupted i.e resend if data integrity was lost or use some other error recovery mechanism. ...
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2 votes
3 answers
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Are thermal effects on an FPGA different depending on how it is programmed/configured?

I am currently on the fence in a debate regarding FPGA environmental testing (thermal cycling). The question is, can the same FPGA stressed to the same thermal limits yield different results depending ...
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4 answers
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Testing motor using an identical motor in regen mode

I want to be able to test a motor (permanent magnet motor + gearbox) continuously in steady state mode at different operating points (torque, RPM,) to measure the efficiency of the motor. Instead of a ...
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1 answer
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How can I make a test bench for an electric motor?

I'm in college and we are designing a plane for SAE Aero Design, we are trying to come up with a design for a litle test bench for our motor any idea how can we do it, a DIY way, also do you guys have ...
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How to predict which machine will act as motor or generator in Hopkinson's test?

Is there any way to predict which machine will act as a motor and which acts as a generator before applying the supply voltage? I cannot find a way to predict what will be the behaviour(motor or ...
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How to verify whether an electrical appliance is properly grounded?

I read that an electrical appliance/equipment that is not properly grounded can kill people, especially if it uses mains socket where the current drawn can be high. In fact, even a simple microphone ...
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11 votes
2 answers
860 views

Lead Acid AGM battery testing - Why am I testing it this way?

OK, so maybe it's not fair asking YOU why WE test something the way we do. ;) Here's the thing -- Our company uses AGM Lead acid batteries in some products. The testing methods are ancient (but so ...
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Evaluation kits explained

I am new to electronics and have been seeing a lot of so-called "evaluation kits" for certain MCUs. For example this Atmel SAM R21 Xplained Pro kit claims to be: "a hardware platform to ...
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2 votes
2 answers
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Bed-of-nails testing of ethernet signals

I'm designing a BON testing fixture for a complex board (multiple processors, fpga, memory, etc). One of the items to test is an external ethernet connection (1Gb). In the current design, the ethernet ...
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Electronic test clip (hook/grabber): how to open it up?

How do I properly disassemble one of these hooked test clips? The wire broke off: you can see the tiny remainder inside the oval hole. I want to fix / re-solder the wire, but how do I open up the ...
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1 answer
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Electric grid power transformer winding: If it is milliohms, why does 9V DMM show infinite ohms?

When testing large MVA power transformers, like 66kV to 16kV, the winding resistance in DC ohms is milliohms. It takes a high current supply to do this, then the V is measured across the winding to ...
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1 vote
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firmware testing methods

This is my first question here from the community :) So I have inherited some bad embedded code, the whole firmware is a messy spaghetti state-machine that has an infinite number of states! and it is ...
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How to compare performace of EMG electrodes?

I'm working on building an acquisition system for sEMG signals. The problem I'm facing is how can I reliably measure the performance of different designs? Obviously I can just put the electrodes to my ...
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