Questions tagged [test]

A definitive procedure that produces a test result.

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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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1 answer
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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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2 answers
93 views

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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1 answer
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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 ...
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4 answers
63 views

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 (...
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2 answers
105 views

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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1 vote
3 answers
84 views

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 vote
1 answer
79 views

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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6 votes
2 answers
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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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2 answers
206 views

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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2 votes
1 answer
205 views

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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22 votes
5 answers
3k views

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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1 answer
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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 answers
70 views

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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1 vote
2 answers
250 views

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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1 vote
2 answers
109 views

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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1 answer
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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 answers
63 views

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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1 answer
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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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1 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, ...
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3 votes
7 answers
2k views

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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4 votes
3 answers
437 views

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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0 votes
1 answer
87 views

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 ...
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1 answer
54 views

How to find out which side of transformer the OC and SC tests were performed?

I have this problem which states that in a single phase transformer 2200/110 50kVA No load and short circuit specifications are like below, How to find out which side of transformer were the tests ...
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-1 votes
2 answers
83 views

Test Verilog FSM for state with no reset

My professor gave us several Verilog test files to write Verilog test benches for. In the test bench, we're supposed to initialize the state to 0, apply random inputs, and check to see if we have ...
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2 answers
883 views

Oscilloscope probe points

The answer to another question identified two PCB-mounted scope probe "holders": I can't find these at any distributor's web site because I don't what they are called. Can someone, please, give me ...
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1 answer
47 views

Open and short test for 2 ground pin

If a device has two ground pins. Using the normal open and short test will not tell if one ground pin is open and the other is good. How to detect this kind of situation? Thanks.
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0 answers
196 views

Schottky diode EAS test circuit

I'd like to test the non-repetitive avalanche energy (EAS) of a particular Schottky diode (VS-12CWQ10FN-M3), but I've never done this test before and can't find a typical test circuit. This comes from ...
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1 vote
1 answer
65 views

Measuring 150kHz, ~30V peak waveform with good resolution

I am trying to choose test equipment for a systems test application and I am running into a road block with one of the specs I need to meet. The device features an H-bridge output similar to the ...
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0 votes
0 answers
163 views

USB 2.0 Signal Integrity Using HSETT

I am trying to test USB 2.0 Signal integrity (Eye Diagram). For doing that, USB IF Forum lets you download the EHCI HSETT Software from their website. However, I am not able to use it due to one ...
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0 answers
137 views

RS485 - Comunication lost during EFT IEC 61000-4-4

I'm having throubles with communication over RS485 in harsh industrial environment. We perform test in EMC lab, acording IEC 61000-4-4 = Fast transient (also known as Burst). We used burst generator ...
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0 votes
1 answer
87 views

Applying Ripple to a DC Source?

I have a system that is powered by a 25V Lithium ion battery pack. I need to test the system with a 1 Vpp sine applied on top of the 25V supply, so 25V +/- 0.5V ripple. I know theoretically to get ...
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3 votes
3 answers
666 views

Should you Megger test transformers?

I have heard people say you shouldn’t Megger test transformers because the high voltages used might cause insulation between windings and between windings and the core to breakdown. Is this true? ...
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3 answers
989 views

Power Supply Earth for Bench Testing

I work in a typical electronics lab, with resistive earth mats, ESD straps and isolated DC power supplies to test prototype PCBs. I prefer not to use the power supply earth-ground, and to leave the ...
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4 answers
1k views

Temporary but hands-free JTAG/SWD connection

I have a PCB that will have very little clearance on both sides so that putting a normal Cortex SWD .50 spacing connecter is too big. However, I'd still like to have the option of connecting via SWD ...
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2 votes
2 answers
5k views

How do we test and determine if a USB cable+connector is version 2, 3.0 or 3.1?

How do we test and determine if a USB cable+connector is version 2, 3.0 or 3.1, without using port, PC and/or having data transfer but instead with basic physics tests e.g. using multimeter?
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1 vote
1 answer
150 views

Is there a good way to test your schematic before buying the parts and building it?

I'm trying to design a BMS that can handle 12 cells, be powered either with a isolated dc-dc converter or the batteries themselves and uses active balancing, but I'm not sure if my design will work:
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2 answers
2k views

How to test a TRIAC with just a digital multimeter and no external circuit

I need to fix an electric kettle and would like to test the health of the TRIAC BTA20. How would you test this component health with a digital multimeter - without any extra components and ideally ...
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1 vote
1 answer
773 views

Built-In Self Test LCD

I've recently been trying to connect a custom LCD (ET101005DSAK0) to an Embedded System on Module however without any success. When debugging why the LCD is not working I wanted to make use of the ...
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0 votes
1 answer
330 views

Electronically verify whether cable is connected to RJ45 connector

Background: I have a device that interfaces with a motor controller over RS-485 via an RJ45 socket. Currently, the port is a standard 4x2 RJ45 connector with the RS-485 using pins 2 and 7 Currently ...
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2 answers
141 views

Can I connect 10 AWG wire carrying up to 25 amps to 10 parallel 1 ohm 10 watt resistors?

I am trying to measure the charge capacity of some LTO battery cells. To do this I want to discharge each battery cell from 2.5 V to 1.7 V. I am going to measure and log the current over the discharge ...
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2 votes
1 answer
554 views

How to test a capacitor?

I've got a big 560 uF, 400 V capacitor and I've tested it with a meter and the capacitance is within spec, same the ESR and it has a vloss of 0.8%. So all seems fine but then I came across this video ...
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0 votes
2 answers
108 views

Quality Control Tests for hardware

We are in the process of creating a quality assurance & control department at work. I need to define different tests for the hardware that we make. The devices are composed of multiple pcbs, with ...
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0 votes
2 answers
62 views

DC test equipment to see voltage extremes? [closed]

I want to experiment with magnets and coils to produce voltage. I need test equipment to find the highest positive voltages and the lowest negative voltages obtained during tests. My needle driven ...
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0 votes
1 answer
2k views

Continuity testing - Why does swapping DMM probes give differing results?

Continuity query - Can anyone explain this? Circuit is a simple 12v DC, wired as follows -battery pos to bulb to spst switch back to battery earth. Testing with DMM in the dedicated audible ...
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