The tag has no wiki summary.

learn more… | top users | synonyms

7
votes
1answer
545 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 ...
1
vote
2answers
61 views

Computer Power Supply Testing Safety

I have a 750 watt ATX power supply that I will be testing with a multimeter to make sure the right voltages are present. How can I make sure that I do this safely? Is there anything that's threatening ...
0
votes
1answer
80 views

Test 220V 50 Hz signal using oscilloscope [duplicate]

Can I test a direct electric signal wave AC 220V 50 HZ using an oscilloscope in safe mode and the schema for this testing. The description in my oscilloscope say that the input AC pk and DC is Max ...
6
votes
3answers
913 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 ...
1
vote
1answer
79 views

Hardware test of FPGA, thousands of combinations?

My colleagues longtime ago have designed an FPGA (using VHDL) for a special purpose. Another colleague prepared the test scenarios. Now they want me to test this FPGA board following these written ...
1
vote
2answers
112 views

What Language should I use for automated testing? [closed]

I'm the Lab Manager for a small company in the RF industry and I've recently been asked by our engineer to find a more "up-to-date" programming option for automating my bench testing/calibration ...
1
vote
2answers
73 views

How are stuck at faults in a combinational circuits considered

I came over this example given in literature explaining the stuck at faults (possible) to be considered in a combinational circuit. I don't understand why g, h, i nodes in the circuit are considered ...
0
votes
0answers
47 views

What would be some solutions to prevent system malfunction after IEC 61180 4 kV and 6 kV tests?

My team of engineers are developing an energy analyser that have to be submitted to the 6 kV transient tests of IEC 61180, Table 1 Line 8 and 4 kV fast transients tests, Table 1 Line 9. When we were ...
2
votes
1answer
86 views

Testing 4kv supply

I need to test if the trigger coil on my strobe circuit is working or not. But it has a 4kV output. How do I test such high voltages?
0
votes
1answer
57 views

Testing hall effect sensor of a motor [Beginer question]

I would like to test the hall effect sensor of a motor (DC brushless Papst dual coil) I have for a small project of mine. I have found a bit of information online, but I cannot seem to figure out what ...
0
votes
3answers
120 views

Is it possible to check an Ethernet twisted pair with a multimeter?

It would be useful to measure electrical parameters (such as I,U,R and perhaps L,C or other) at the end of the cable, when the other end is disconnected or connected, and analyze the physical layer of ...
0
votes
2answers
82 views

Discovering operating power of a component without destroying it and without specification

I have a laser pointer component that I figured was a 9V pointer, and it worked nicely and shone very bright. I kept decreasing the voltage to see how low it could go, and it turns out it runs great ...
3
votes
1answer
91 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 ...
0
votes
4answers
205 views

What will happen to a transformer if rated output voltage is injected to the secondary terminal?

I believe that I have a three phase delta to single phase transformer 1Kva with input 415 v three phase and output 230 Vac single phase. ( Someone help me to identify what kind of transformer is ...
0
votes
2answers
92 views

What are the plated holes on this PCB for?

In the top left corner of this snapshot, you can see a bonafide test point, TP12. Slightly down and to the right of TP12 you can see an exposed copper pad, also likely a test point. What I am ...
5
votes
1answer
129 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 ...
0
votes
1answer
163 views

Pogo Pins for 1.5mm Pitch Test Fixture

I'm working on a design and am going to source a smaller pcb and solder it to my design. Before using the sourced board I'm wanting to test it and so I'm trying to design a test fixture similar in ...
0
votes
1answer
98 views

Problem using Quad buffer gate (SN74HC125N)

I've ordered a couple of quad buffers (SN74HC125N) from AliExpress and they don't seem to behave. I tested it using an Arduino Uno with the following wiring: ...
0
votes
1answer
54 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
107 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
129 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
102 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
139 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
52 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
849 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
527 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
190 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 ...
6
votes
4answers
356 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
134 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
2k 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
2k 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
176 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
161 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
96 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
270 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
289 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
115 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
400 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
2k 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
915 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
128 views

Iverilog test cases

I am working with testing certain test cases with iverilog with -o option for example ...
2
votes
1answer
126 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
771 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
135 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
305 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
4k 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
2k views

How do you test condoms electronically?

Condom packages often say "electronically tested". How can you test a condom electronically?
3
votes
1answer
267 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
952 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
526 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 ...