The testing tag has no usage guidance.
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2answers
75 views
Nomenclature for tested PCB assemblies
I want to unambiguously refer to an assembled PCB that has been tested. I am familiar with the terms:
PCB - unpopulated printed circuit board
PCBA - PCB assembly, a PCB with all the parts fitted and ...
0
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1answer
29 views
Protecting Test Equipment During an ESD Test
I am planning to run an ESD test on a product running traffic to some test equipment over gigabit ethernet and some other signaling interfaces (RS-232, USB, etc.) How do I decouple the ESD spikes from ...
1
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1answer
49 views
mA output testing/validation
I need to validate the 200 mA @ 24 VAC claim on a Transformer/Power Supply. I have some resistors but I don't know how to proceed. Help anyone?
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0answers
42 views
Table lamp CE marking / safety testing for sale to the public
I am designing a table lamp that uses the following components:
An LED coin module (running at 3.15 watts, 8.4 to 9.75 volts)
powered by a plug-in constant current LED driver that is CE marked
I am ...
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0answers
21 views
Check the ADC internal Atxmega32E5
I am trying to use the ADC internal to the microcontroller Atxmega32E5. Hereafter there is the code for take the converted value from one channel of the ADC.
Could you please suggest me an easy way ...
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4answers
355 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 ...
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0answers
21 views
How to test plastic for ESD properties?
I'd like to make myself a cheap soldering / inspection station by taking an acetal plastic slab and mounting a linear rail to it for attaching a USB microscope. However, I want to first ensure that ...
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2answers
43 views
Test car phone charger amperage [closed]
I have at car usb charger. It has 2 ports and is rated 2.1A when one port is used and 1A when both ports are used.
I attached samsung tablet (N8000) witch requires 2A output. So, tablet isn't ...
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5answers
116 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 ...
1
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2answers
44 views
measuring a bad motor and large current spikes in a brush motor [closed]
I am new to this forum, I am an EIT and I have been tasked to implement a fixture to measure high current spikes on brush motors when loaded and unloaded.
I am at a loss here as I have never ...
0
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1answer
55 views
How do I keep a square wave output voltage high for a TTL application?
I am passing an AC signal (24 Vrms at 1K Hz) down a line through a diode of unknown bias.
Due to uncontrollable variables in the environment, there are 4 possible outcomes:
Positively Rectified -> ...
6
votes
2answers
387 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 ...
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0answers
49 views
Is horting SPI to test PIC24 communication damaging in any way?
I have a question concerning SPI (don't we all) and I was hoping that someone can help me out before I do something stupid (which is usually my favourite way of learning, but I only have one board so ...
2
votes
3answers
297 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 ...
0
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1answer
74 views
What is the best way to safely verify the state of a digital pin on a live circuit by external means?
A typical digital pin of a microcontroller usually has 4 possible states:
output, logical 0
output, logical 1
input, tri-state (high impedance)
input, internal pull-up resistor
On a live circuit, ...
0
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0answers
52 views
How can I connect two design units in modelsim simulation
Motivation:
When I build a hardware component that consist of many sub components, then I need to test the sub components before I connect them all up and make a thorough testbench in VHDL. In some ...
3
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3answers
104 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) ...
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3answers
90 views
Why the stable supply voltage present a ripple after connecting it to the testing board?
I used a power supply to supply 1.8V as the Vdd of the tested-circuit,
after I connected 1.8V to the Vdd pad of the testing-board,
the originally "clean" 1.8V began to have a ripple (the total current ...
7
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1answer
198 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 ...
1
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1answer
28 views
Which instrument for arbitrary signal commutation (matrix)
I would like to test a bunch of sensors. Each sensor has a DB15 connector with mixed digital and analog signals (bw ~5MHz, Z ~120R).
I am looking for an instrument where I can control which couple ...
1
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3answers
77 views
Testing Long Time Delay
I have implemented a long time delay using a small microcontroller (MSP430) however I need to test and verify that it does as I expect.
My algorithm is as follows:
...
1
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1answer
49 views
Finding transformer paramters
When finding parameters of a transformer, can you perform the OC test and the SC test on the same side?
Or is it necessary to perform them on separate sides?
I am aware that by convention in the real ...
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1answer
93 views
Misbehaving logic gates
I made a prototype to test a few logic gates and found out that
1) My AND gate (7408) Works like an OR Gate.
2) My OR Gate (7432) is always on
3) My XOR Gate (7486) is always off
4) My NOT Gate ...
0
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1answer
107 views
Testing Capacitors - Differing Results Each Time One Is Tested?
I have a bust LCD TV - I've already ordered a replacement but am interested in using the broken TV to learn a little more about how these are put together and if I'm lucky fix it to have as a spare. ...
1
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1answer
112 views
Why does smaller step show instability better?
I was stability testing a simple op amp circuit by applying a square wave to the input and looking for ringing etc. on the transitions.
I figured, hey, I'll give it a big whack, say from 0 to 5V, ...
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2answers
477 views
VHDL testbench variable clock/wave generation
A testbench for one sub-entity in my system currently defines a helper process to generate a clock-like waveform at the command of the main stimulus process. A simplified version of it is:
...
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1answer
56 views
What tests, if any, can I execute to determine whether a PV panel has deteriorated?
So I'm possessed of an aged Photo-voltaic panel (around 15years) that came with a night-lamp.
When placed in the sun here (21.17, 79.09) - on a sunny day the multimeter shows me as much as 11V from ...
2
votes
2answers
246 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 ...
4
votes
3answers
75 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 ...
1
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3answers
484 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 ...
1
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4answers
188 views
How to test analog component before mounting?
I have been in a small factory today, they produced 4 kind of PCBs that all are simple analog boards, each month they produce 1000 of them. The problem is that till now, after mounting them almost 10% ...
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1answer
80 views
What kind of testing equipment is used for UPS (>15 kVA)?
I work at IT division of a bank. Currently we need to order some Double Conversion True Online UPS ( Uninterruptible Power Supply) systems for our our new data center. The required ratings for UPS are ...
2
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1answer
40 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 ...
3
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2answers
82 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 ...
0
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2answers
79 views
PCB testing register software [closed]
Good day all,
This is my first question on the electronics board, and I have checked for similar queries, but so far no luck. It is possible that I'm searching for the wrong terms, so I will ...
0
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1answer
95 views
Testing an Analog Front End prior to installing a Sensor
I've designed a circuit around the TI LMP91000, a configurable Analog Front End (amperometric potentiostat, for use with electro-chemical gas sensors). In addition the circuit includes a 2.5V ...
7
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1answer
579 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 ...
2
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2answers
115 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
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1answer
213 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 ...
7
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3answers
958 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 ...
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2answers
169 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 ...
0
votes
2answers
290 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
188 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 ...
2
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1answer
117 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
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1answer
176 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
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3answers
1k 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 ...
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2answers
83 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
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1answer
180 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 ...
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4answers
583 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 ...
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2answers
110 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 ...
