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Questions tagged [testing]

The tag has no usage guidance.

26
votes
5answers
9k views

Testpoints: Vias versus pads

I was fixing an ultra cheap home router few days ago and noticed that it had vias marked TP_12V, TP_3V3, TP_GND and similar. The problem turned out to be leaky electrolytic crapacitors in the buck ...
25
votes
3answers
3k views

FCC and CE Testing / Failure Resolution

I'm seriously thinking about (practically committed to) taking one of my products through FCC and EC testing and it's my first time doing so. It's Arduino based electronics running off a 16MHz crystal ...
21
votes
14answers
4k views

What can I put a kilowatt into? (Or: help me save my hairdryers)

TL;DR: I need something to discharge roughly 160A at 14V into, or 2.24 kilowatts. Any comments, or answers, with either a) something I can dump a kilowatt into, b) some way I can modify a common item ...
18
votes
4answers
1k views

Electronics System Standards Compliance: Certification, Testing & Verification

Please note: this question has to do with the technical compliance aspects of the consumer electronics indsutry, and as such, I believe is within scope for this site. This question is about compliance,...
18
votes
1answer
7k views

How do you test condoms electronically?

Condom packages often say "electronically tested". How can you test a condom electronically?
15
votes
3answers
268 views

Puff of smoke in air. 3 different PCBs. PCB has ghosts?

Yes, that is a haiku.  (EDIT: fixed it... it is now actually a Haiku) No I'm not smiling. I'm doing some standard testing; seeing what happens when one of the two power rails gets shorted to GND on ...
12
votes
3answers
1k views

How to add a controlled amount of jitter to a signal

Background I am developing a digital clock and data recovery circuit and am now getting into the evaluation phase, focusing on testing the limits of the design and finding potential strengths and ...
10
votes
2answers
5k views

Continuity tests, risks?

Even though the electronic device is powered off, isn't there a risk of doing a continuity test on connections in the middle of the circuitry ? I mean, you do apply voltage doing so - couldn't that ...
10
votes
1answer
185 views

What happened to all of the Dynamic Signal Analyzers?

Decades back there were at least half a dozen instrumentation companies offering Dynamic Signal Analyzers (DSA's). Not Spectrum Analyzers, but rather Dynamic Signal Analyzers. The main differences ...
9
votes
6answers
12k views

Any tricks to attaching a wire or pin to a testpoint?

More and more often, I find myself needing to tear apart a device to seek out and connect to serial pads. These pads typically give me access to the underlying operating system for research or ...
9
votes
4answers
273 views

How are high-speed circuits tested if test equipment doesnt exist?

How was testing done for Ghz to THz range circuits and devices before fast enough scopes and frequency counters existed?
8
votes
2answers
8k views

How can I determine if a microcontroller is damaged?

I have a few microcontrollers sitting in my "junk parts" bin. I think some of them arrived there when, after programming them, they exhibited strange behavior. I've since learned a lot, for example, ...
8
votes
1answer
667 views

Are there any standard testing methods for bare metal code

I want to know if bare metal code, especially things like device/peripheral initialization code has any testing methods since there is little to nothing that can go wrong when writing to registers (...
8
votes
1answer
300 views

Is it possible to test a lithium ion battery for safety? How?

There have been stories in the news recently about fires that are believed to be caused by the lithium-ion batteries inside hoverboards. If you had one of these devices and didn't mind taking the ...
8
votes
5answers
1k views

Best way to test a high current pcb design 70A @ 12V

I designed a circuit (MOSFET HBRIDGE) that Should Be able to handle 70A @ 14V. Now that the board is sent out I am on to thinking about how to properly test it. Right now the most logical way I have ...
7
votes
3answers
994 views

First checks after oscilloscope unboxing

You bought your first entry level oscilloscope (e.g. Rigol DS1004Z series, 4 Channels, 50-100MHz, 1Gs/s) and while it is slowly warming up to room temperature you are wondering if the unit you have is ...
7
votes
2answers
3k views

How to measure the impedance of PCB trace

I am working on some front end electronics design working at 200MHz to 1 GHz for my MS project. I have designed the circuit and PCB. Trace width were calculated by simulations. After I given this to ...
6
votes
6answers
2k views

Techniques for building 'Bed of Nails' testing board

When testing a complete circuit board a 'Bed of Nails' can significantly reduce time and errors. What are some techniques for making a DIY Bed of Nails? ...
6
votes
5answers
2k views

Testing points in PCB

I am designing a prototyping platform called evive. It is a learning cum prototyping platform for students and makers. Since many times we requires debugging of our circuits, so I thought to include ...
6
votes
5answers
2k views

Embedded Applications Software Testing Life Cycle

I have no JTAG and I can not afford it for my ARM Cortex M3 Chip. I'm wondering, how professionals debug their applications ? Do you flash your uC every time, frequently, then you run and test, ...
6
votes
4answers
3k views

What is a good way to test maximum current?

I am building a device that can power other devices (it has a voltage regulator, battery controller, etc...). What is a good way to measure how much current it will provide, and/or test if it will ...
5
votes
3answers
263 views

Testing paradigms for consumer electronics [closed]

I am brand new to EE/ECE (my background is software) and I am curious about how real-world electronics testing takes place. In software, there are many different types of tests that a piece of code ...
5
votes
5answers
1k views

How to test SMD bluetooth modules without soldering them to a board [duplicate]

I have made a costum PCB with components and a WT51822-S2 bluetooth module. After testing, there seems to be a low percentage of modules that have a fault in them. Since they are SMD modules, with ...
5
votes
2answers
304 views

Checking for a short in a circuit with a large capacitor?

I'm developing a small testing application for my company that tests various hardware and software functionality. I do however have a problem developing a simple way to check for short circuits in ...
5
votes
1answer
213 views

Requirements tools for PCB design?

I'm writing requirements for our PCB designs, determining what clients want and what's possible to build. When requirements are finalized, I write tests for the same designs. Right now, I'm doing it ...
4
votes
2answers
9k views

Basic Embedded Firmware testing essentials and Software Test plan [closed]

I am trying to make an embedded product, but I'm new to firmware testing and want to make sure I don't miss anything. What are the things that need to be checked for its firmware performance? Proper ...
4
votes
1answer
64 views

What are the tradition ways to signify/advertise that a potentially dangerous long-running test is in progress? [closed]

I frequently need to run long-term tests which have some potential for damage or harm if e.g. someone disturbs the test apparatus without being aware that it's running a test. Say for example ...
4
votes
1answer
342 views

local/bench earth leakage for testing mains electronics

I sometimes find myself testing switch mode power supplies and such that I have repaired, and often some undetected fault causes them to trip the earth leakage breaker on the distribution board when ...
4
votes
2answers
167 views

Design for test - What the different ways in which this is done

I know that when we are designing digital circuits we may add porition to it that helps in testing it. This may go beyond merely boundary scan test. What resource can I can use to understand this ...
4
votes
2answers
208 views

What tests, certifications and labels do I need on my new electronic gadget? [duplicate]

I have designed a VERY basic lighting gadget -- it's basically a flashlight. It turns on and off with a switch and is powered by a rechargeable Lithium Ion Battery via USB cable. It consists of LED's ...
3
votes
2answers
161 views

What tolerance do typical components have to wrong-polarity voltages/currents?

I've always been a bit hesitant to do continuity tests on populated PCBs, on the basis that if there is no trace connecting the two probes, I will be applying some finite voltage to arbitrary IC pins (...
3
votes
3answers
630 views

How to design contact pins for testing SMD board? Only optical inspection possible testing technique?

The point 6.56 and the Teensy's testing are examples about testing, also the pictures below. Now suppose you want to do a SMD board to the size of fingerprint or smaller. The earlier video mentioned ...
3
votes
4answers
562 views

Setting up a new electronics lab [closed]

I am setting up a new electronics lab for embedded systems related work. We need four or five workbenches/workstations, a soldering station, enough storage space for all the essential electronics ...
3
votes
2answers
320 views

Need of self testabilty code inside embedded firmware modules?

I have a question to ask about the self-testability code inside a firmware module. I have developed code, and it was in a shamble, and I was clueless about firmware architecture too. Later I found ...
3
votes
2answers
478 views

How to clean dirty test pins in bulk?

Is it possible to clean lots of dirty test pins reliably? We have about 6000 of these test pins and most of them are very dirty. If I cleaned them, what kind of lubricant should I use to relube them? ...
3
votes
3answers
529 views

Can probing an EEPROM with a multimeter corrupt the data?

Say there's an EEPROM on a board and you happen to try probing the pin one by one with a multimeter, is there a good chance that the sequence of probing the pins must have overwritten (thus corrupt) ...
3
votes
1answer
572 views

How to automatically test the audio quality of a telephone line that randomly goes bad?

I am a computer scientist and I'm working as sysadmin of a small firm where I've been managing also the telephone system that my predecessor put in place. Albeit I don't really have the skill set ...
3
votes
3answers
50 views

Testing a thyristor

I have a very large high voltage device that a friend asked me to take a look at. It has a bunch of BIG thyristor packages (Semikron, SKKT 106/18 E, Dual Thyristor Module, 600A 1800V). I'm testing ...
3
votes
2answers
168 views

Best practice for probing capacitance sensitive test point in a switching supply?

I need to probe the hot side of a switching supply between the drive transistor and inductor (Marked TP on diagram). I tie my scope ground to the device ground with short fat wire and when probing ...
3
votes
1answer
594 views

ATmega2560 not responding on hand-assembled PCBs

I've assembled some PCBs that I had made, and I'm unable to get the ATmega2560 to respond to programming via the ICSP header. On the third board I'm trying, I have soldered on only the MCU, the ICSP ...
2
votes
3answers
3k views

Why doesn't my multi-meter diode tester work on this LED?

I own a TENMA 72-7720 Multi-meter with LCD/continuity tester: I've used this on other LEDs to test, no problem, using the diode tester setting (approximately 2:00 on the dial by the hold button) I ...
2
votes
3answers
255 views

Why does this guide recommend a 500MHz oscilloscope for power supply testing?

EDN have an interesting (for novices like myself!) guide on testing a power supply's design, in which they suggest a 500MHz oscilloscope as one piece of equipment necessary for "proper" testing: ...
2
votes
4answers
674 views

How can I test a wire for small holes?

I have stripped one wire, the black/hot/positive one, for a 120v appliance. I had to cut away the outer plastic that surrouneds all three wires, and now I'm afraid I may have nicked a small hole into ...
2
votes
3answers
490 views

What design testing can I do before fabbing a PCB?

I'm an EE graduate who enjoyed the first taste of designing and fabricating hardware. My first board was a really low speed microcontroller board using mostly DIP and through-hole components, like ...
2
votes
2answers
327 views

Of what real, practical use is electronics certification?

I am brand new to EE/ECE and am aware that companies such as UL offer a gammit of services such as: Circuit verification (they verify your schematic does what its supposed to do and doesn't have any ...
2
votes
3answers
2k views

What is the importance of using asynchronous reset instead of synchronous reset?

I have a simple Verilog module with only one synchronously reset DFF: ...
2
votes
1answer
132 views

Does DCMI mean dc mA?

I am working with a 60 year old schematic and test procedure. The latter refers to adjusting rheostats to "300 DCMI" or "between 100 and 130 DCMI". There are voltage and ammeters attached to different ...
2
votes
3answers
2k views

How to test op amp stability?

I've got a circuit I'm developing using an op amp to drive a power MOSFET for an electronic load: I'd like to test it for stability, but I don't have enough experience to know what perturbations are ...
2
votes
1answer
3k views

Obtaining an op-amp's open loop gain

I'm trying to obtain an op-amp's open loop DC transfer characteristic curve on an oscilloscope, and from the curve, the open loop gain. Here is an image (from some random website) showing the curve I ...
2
votes
1answer
145 views

Optimizing product tests?

I'm currently working for a company where I design and implement an automated test program to test our products. Currently our tests take quite a bit of time (several minutes per unit) and need to ...