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6
votes
2answers
288 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 ...
0
votes
0answers
44 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
288 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
votes
1answer
67 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
votes
0answers
29 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
votes
3answers
77 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) ...
1
vote
3answers
88 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 ...
0
votes
0answers
26 views

Function Generator Driving Multiple Outputs

I am characterizing a solenoid (valve) and I am using a function generator as the control signal on a BJT to turn on/off the solenoid. I can generate the pulses I need but I need the same control ...
7
votes
1answer
177 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
vote
1answer
26 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
vote
3answers
70 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
vote
1answer
39 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 ...
0
votes
1answer
88 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
votes
1answer
77 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. ...
0
votes
0answers
77 views

Is there any way to inspect small holes (in micron scale) inside a PCB non-destructively?

I have PCBs with two layers of copper at top and bottom. PCBs with low quality have holes between top layer copper and epoxy. The holes are in near circle shape with 20 - 70 micrometres of diameter ...
1
vote
1answer
79 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, ...
1
vote
2answers
273 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: ...
-1
votes
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
231 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
67 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
vote
3answers
342 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
vote
4answers
181 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% ...
1
vote
1answer
71 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
votes
1answer
37 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
votes
2answers
75 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
votes
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
votes
1answer
83 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
votes
1answer
575 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
votes
2answers
98 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
183 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
votes
3answers
943 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
2answers
143 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
224 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
145 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
votes
1answer
106 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
145 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
682 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
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
votes
1answer
148 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
424 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
109 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
155 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 ...
1
vote
1answer
324 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
161 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
60 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
283 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
167 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
104 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
211 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
56 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 ...