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Questions tagged [test]

A definitive procedure that produces a test result.

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11
votes
5answers
6k views

What parts would one typically use for automated PCB testing?

I have a circuit board in production, primarily through-hole, to the tune of ~400 units per year. Each one is manually inspected and tested. The board has ten distinct voltage rails, four voltage ...
12
votes
4answers
26k views

How to test a crystal resonator in board?

I have 2 quartz crystal resonators in my pcb board: 32.768 kHz & 20 MHz. They are connected to a Freescale MC12311 transceiver IC, which has an HCS08 micro-controller embedded in it. I want to ...
4
votes
5answers
1k views

Stress testing an FPGA's power supply

I have an FPGA (Xilinx Spartan 6) for which I want to stress test the power supply in "steps" (e.g. the FPGA runs in loops of 1 seconds: full steam for 900 ms, halted for 100 ms) to check that the ...
2
votes
4answers
2k views

Is it feasible to test microprocessor/microcontroller?

What I can do if I want to test the microcontroller?
3
votes
1answer
2k views

Test circuit for EU1640BCH12T / R Water proof ultrasonic sensors with Arduino?

I have EU1640BCH12T/R waterproof ultrasonic sensors, which I have got from this link. These are standalone raw sensors without breakout board and not a module like HC-SR04. Being a new electronics ...
2
votes
3answers
3k 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 ...
12
votes
3answers
41k views

What is Full form of hFE of a digital multimeter?

In digital multimeter, there is a transistor-check function, and there is a term hFE. I do-not know how-to use-it, however, different Websites say it is a measurement transistor's gain ("the ratio of ...
8
votes
9answers
18k views

Large difference between specced values and real values for LED strips?

Recently I bought some "300LED/5meter Waterproof 5630 SMD LED Flexable Strip" i.e. High brightness LED strips from China. In the specifications, it was said that the strip consumes 75W @ 12v, which ...
10
votes
2answers
6k 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 ...
9
votes
2answers
292 views

Calculate the resistances of all the possible connections inside a N-terminals black box based on measurements between terminals

Although it would seem that this is not the right SE for this thread since it is about creating an algorithm, the problem is actually about finding a systematic approach to the simplification of ...
2
votes
2answers
21k views

Testing the condition of an old sealed-lead-acid (SLA) battery

I have a small 3 year-old 6V 1.2Ah SLA battery that is used in a solar powered burglar alarm sounder box. The sounder recently stopped operating and the battery shows a voltage of about 4V so I am ...
3
votes
2answers
3k views

How can I test a hex Schmitt trigger?

Yay, me...I just got done soldering my first surface mount IC. Because I know how volatile heat can be, and with how close the tip of my iron was to the IC (especially without a socket!), I'd like to ...
1
vote
3answers
3k views

Debugging I2C bus using an oscilloscope

Is it possible to debug an I2C bus effectivaly with a two channel (plus an external trigger) oscilloscope? I've been trying to do it, to catch a single transaction starting from the start until the ...
0
votes
4answers
7k views

Troubleshooting PCB of an ATX power supply? [closed]

Im new to PCBs, know the basics of electronics and testing of individual components. I have a PCB (of an ATX supply) that is not working when I power it, so I thought of testing each components like ...