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0
votes
1answer
47 views

How are processors tested before going to production?

No matter how much experience an engineer has, or how many engineer works on the design of a processor or a microcontroller, we are human at the end, and it is possible to make mistakes. Before ...
1
vote
1answer
54 views

Old phone continuity tester

An old man I used to work with had a set. Two old handsets with two conductors coming from them. It had a 9v power supply, I believe. We used it to trace existing interlock wires, hundreds in one ...
1
vote
1answer
118 views

How to supply 2 different voltages to a circuit every 2 minutes

For executing a (stress) test scenario, I need to simulate the following behavior on my circuit: for 2 minutes, deliver 11V to the circuit for 2 minutes, deliver 14V to the circuit for 2 minutes, ...
1
vote
3answers
100 views

Determine break in long circuit

I have a circuit of switches like this. The switches are a long way from the supply and a long way from each other. ...
0
votes
2answers
90 views

How should I understand this twin coil relay pinout? (Screenshot)

I'm currently looking on an automotive twin coil relay. The Datasheet gives me following schematic: My Question is: How could I test this relay? In other cases I put the corresponding Voltage on ...
1
vote
1answer
43 views

Ensuring an SSR relay is dead

I recently purchased a used IEC Centra centrifuge with a refrigeration feature. Works great, except the refrigeration condenser never cycles off and as a result the chamber gets down to the minimum ...
5
votes
5answers
780 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, ...
1
vote
1answer
388 views

Problem testing an ADC with a DAC and voltage divider

I am testing a self-made ADC shield for Arduino Due based on the ADS1299, a 24-bit ADC with a 24x programmable gain amplifier. I have a signal generator sketch running on another Arduino Due that can ...
3
votes
2answers
117 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 a code and it was in a shamble and i was clueless about firmware architecture too. Later i found ...
6
votes
4answers
279 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 ...
4
votes
2answers
123 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 ...
2
votes
2answers
930 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
5answers
815 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 ...
1
vote
3answers
146 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 ...
0
votes
3answers
122 views

Looking for test leads for individual PCB header pins or socket pins

While recently debugging a device that had a 7-pin male XLR plug, I was trying to connect to two of the pins in the plug, without touching any of the others, and I wondered if there are test leads ...
0
votes
1answer
91 views

Capacitor Testing

I have some old ceramic capacitors and I wanted to test it to see whether it meets the specification in the datasheet or not. I know how to test the capacitance of it but I do not know how to test the ...
5
votes
2answers
259 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 ...
3
votes
1answer
186 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 ...
0
votes
1answer
99 views

Embedded software app testing

The software app being developed runs on the embedded hardware and spits the debug output through a serial port during various functionality of the app. Following are the questions. Can I use the ...
11
votes
3answers
289 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 ...
0
votes
2answers
1k views

How to do a loopback test of a parallel port?

I have connected pin 2 to pin 3, pin 4 to pin 5, and pin 6 to pin 20. Can someone please tell me if this is the correct wiring for loopback testing a parallel port? Ia am using BurnInTest 7.1 Pro by ...
2
votes
3answers
611 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
105 views

Iverilog test cases

I am working with testing certain test cases with iverilog with -o option for example ...
2
votes
1answer
123 views

Inducing Hum Deliberately in Analog Circuits

I would like to make a simple testing device that deliberately emits electromagnetic / electrostatic noise to test analog audio circuits for resistance to hum from switching power supplies, PWM ...
8
votes
5answers
625 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 ...
3
votes
2answers
129 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
243 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 ...
1
vote
1answer
3k views

What tests for a defective IC may be done with only a multimeter?

Linked to an earlier post How do I test a circuit without an oscilloscope? Background : Inching forward from the previous post I started to do a simple 555 astable with super super long duration ...
11
votes
1answer
1k views

How do you test condoms electronically?

Condom packages often say "electronically tested". How can you test a condom electronically?
3
votes
1answer
235 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 ...
2
votes
1answer
632 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 ...
-3
votes
1answer
424 views

How can i test a microcontroller circuitry based on software?

Im attempting to write software to test circuits developed on a MSP430f5xx uC. Testing of circuits could be section wise based on the functionality of sections of circuit. I need to ensure the ...
6
votes
2answers
476 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 ...
6
votes
2answers
2k 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, ...
1
vote
1answer
192 views

Testing an inductors self reasonant frequency

Yesterday I was building an LCR meter which wasn't functioning correctly. After some researh online I found that the self reasonant frequency of inductor has a part to play as well. If I understood ...
1
vote
0answers
69 views

FCC Pre-Certification Testing [duplicate]

Possible Duplicate: FCC and CE Testing / Failure Resolution I am looking to do some pre-certification on several boards. I know several members here are quite experienced in this area. I ...
2
votes
1answer
153 views

How can I identify ferrite bead material?

I am working my way through the book "The Electronics of Radio" by David B Rutledge", which details experiments on the various parts of the circuit as one builds a "Norcal 40A" transceiver, as a ...
18
votes
4answers
1k 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 ...
0
votes
2answers
925 views

Low Budget Environmental Chamber - Product Testing

We have a product in which we are experiencing failures due to rain water (presumably) penetrating the case and dripping onto the circuit board. I believe we have the source of the leak identified and ...
15
votes
3answers
942 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 ...