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Questions tagged [test]

A definitive procedure that produces a test result.

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2answers
65 views

Can I connect 10 AWG wire carrying up to 25 amps to 10 parallel 1 ohm 10 watt resistors?

I am trying to measure the charge capacity of some LTO battery cells. To do this I want to discharge each battery cell from 2.5 V to 1.7 V. I am going to measure and log the current over the discharge ...
1
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1answer
73 views

How to test a capacitor?

I've got a big 560 uF, 400 V capacitor and I've tested it with a meter and the capacitance is within spec, same the ESR and it has a vloss of 0.8%. So all seems fine but then I came across this video ...
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2answers
64 views

Quality Control Tests for hardware

We are in the process of creating a quality assurance & control department at work. I need to define different tests for the hardware that we make. The devices are composed of multiple pcbs, with ...
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2answers
44 views

DC test equipment to see voltage extremes? [closed]

I want to experiment with magnets and coils to produce voltage. I need test equipment to find the highest positive voltages and the lowest negative voltages obtained during tests. My needle driven ...
0
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1answer
99 views

Continuity testing - Why does swapping DMM probes give differing results?

Continuity query - Can anyone explain this? Circuit is a simple 12v DC, wired as follows -battery pos to bulb to spst switch back to battery earth. Testing with DMM in the dedicated audible ...
2
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1answer
112 views

Amateur radio practice exam question

The question is as follows: An interfering signal from a transmitter is found to have a frequency of 57 MHz (TV Channel 2 is 54 - 60 MHz). This signal could be the: And the options are as follows: ...
2
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2answers
1k views

Test a transistor with a multimeter

I used the guide at https://vetco.net/blog/test-a-transistor-with-a-multimeter/2017-05-04-12-25-37-07 to test a transistor with my DMM. The NPN transistor I used to test is the "mospec tip130 No11D" ...
14
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1answer
1k views

Amateur radio practice exam question about voltage drop

So the question is as follows: ...
0
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2answers
144 views

X2 capacitor. Test if failed open

I am looking at a small board in a paper shredder (it does not work). If I apply AC power and measure AC voltage across the X2 capacitor (I think it acts as a voltage dropper for the low voltage ...
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1answer
65 views

How to test a lithium battery? [closed]

I ordered some lithium batteries (like this) I'm planning to test the specs like -Maximum Continuous Discharge Current -PCM Discharge Cut-Off Voltage -PCM High Temperature Cut-Off In what other ...
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0answers
47 views

Suggestions for switching 800VDC converter on/off

I'm stress testing(turning them on-off with load every 300 seconds for 1-2 weeks) the components that we are willing to use. have tested several battery chargers with AC input with using a timer relay ...
4
votes
3answers
702 views

How to test for USB dropouts on STM32F?

I've got a devices that is really strange, it drops USB periodically. By periodically I mean on a weekly (or biweekly) basis. By dropping out I mean windows loses the handle to the driver. Dropouts a ...
3
votes
1answer
145 views

Giant pogo pin or spring probe pin for registration during electrical test

Solved: if you search for "GP-2 PCB Board Umbrella Shape 5.3mm Tip Testing Probe Pins Receptacles" you will find these probes! Thanks for the help! I am designing an electrical test fixture, and I ...
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3answers
114 views

Simplest/Cheapest Way to Create 4.5A Test-Load for 12Vdc Step-Down Regulator

I'm looking for the simplest/cheapest (but safe!) way to build a 4.5A test-load for an LMR14050-based 24Vdc to 12Vdc/5A step-down voltage regulator circuit. LMR14050 Datasheet Circuit Schematics ...
1
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1answer
85 views

Potentiometer Range in Speaker Frequency Response Curves

In several speaker spec sheets from CUI a frequency response curve is given, such as in the CLS0231MA-1: Notice the two y-axes: one for the potentiometer (0 dB to 50 dB) and one for the DUT (0 dB to ...
7
votes
1answer
851 views

Verowire woes - how to reliably solder it?

I'm using Verowire (wiring pencil, Road Runner, you name it) quite often to contact test points on my board to make them accessible for measurements (oscilloscope probe, multimeter clamp ...) Image ...
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1answer
79 views

How to simulate ~1ms long power interruption

I am looking to test an embedded system for its behavior during power interruption soon after power on. The system is supplied with 15V DC power with a steady state draw of <...
-1
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1answer
35 views

Motor drive IC test [closed]

I have placed an order for a PCB where i am using two vnh7100as ICs to run two motors. I need to send the PCB makers a test file to test the ICs before putting them on. I have no idea what to send ...
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0answers
43 views

Is there an easy way to provoke soft errors?

So I'm mainly involved in writing firmware for industrial sensors which are expected to be very robust. One of the things you have to face are random errors everywhere, especially in ICs outside of ...
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1answer
124 views

CE certification

One of the required CE test technical files is "Test Reports". This document has to be provided to the test agency. Does anyone know what data should be included in this document? Here are the ...
1
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3answers
59 views

Noise from test pins on signal lines?

Are test pins on sensitive signal lines likely to cause problems? For example, if there is a test pin sticking up from the board on a line going to a 20 bit ADC is there a danger of increasing the ...
4
votes
2answers
270 views

Detachable “debug” portion of PCB?

I'm trying to add "optional" debugging test points to an existing, very dense 4 Layer PCB design (signal - GND - PWR - signal). I'd like to change the existing PCB as little as possible. My idea was ...
2
votes
1answer
99 views

Low volume mixed signal electronics production (hardware test, calibration, flashing) automation [closed]

I am designing a mixed-signal board with microcontroller that will need flash memory programming for its firmware, (self-)testing, and documentation for the final production steps. I know there is a ...
0
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1answer
41 views

What is the relevancy between the actual full load current value (test result) and the supposedly corresponding values from industry standards?

I work on evaluating a motor problem. If I am given an actual current at 100% full load, how does an industry standard value become relevant? I have an example to illustrate the point I am trying to ...
6
votes
3answers
765 views

How low an insulation resistance is too low for a residential electrical system?

I have had occasion recently to test the wiring of a residential building for damage from a lightning strike. I opened all the breakers, removed all the loads, opened the panel, and meggered each hot ...
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1answer
83 views

Resistance tester

I would need to create a simple tester with battery supply that compares resistance of specific wire with reference (approximately 4 ohms) and determines if the wanted resistance is in desired range. ...
0
votes
1answer
66 views

Is it important to consider channel bandwidth of the signal to measure cable path loss for RF testing?

I am performing some RF tests for 802.11 and measuring path loss of the RF test setup, it has a mix of PSK & OFDM signals. I see the norm is to use a Continuous Wave signal to perform RF path loss,...
0
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2answers
132 views

led analyser for pcb functional test [closed]

i'm supposed to work on a project that consists on creating a led analyser to test PCB (functional test) they want me to create a system that can measure the color (R,G,B) and the luminous intensity ...
0
votes
1answer
107 views

Need Test jig for pass transistors

I am trying to find a schematic for a test jig. I have quite a few 2N5886 and MJ15003 TO3 transistors that I purchased and would like to make sure they meet specs. Short of building a separate ...
0
votes
1answer
163 views

Test an LCD for missing segments without looking at the screen? [closed]

I have a product with an LCD screen that sometimes fails with missing segments. I will test the product for a long time to replicate the failure. I will test many at once. I don't want to sit watching ...
0
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0answers
278 views

How to do insulation resistance measurement on a SMPS

Can anyone explain how to measure the insulation resistance of an isolated SMPS PCB? Is it correct to tie ACL and ACN and apply one terminal there, and the second terminal goes to the ground of the ...
1
vote
1answer
86 views

Field tests for veryfying stator core laminations loose in 3-phase, 3000 HP motor

We have a 4000 V, 3-phase, 366 A, 3575 rpm, 3000 HP induction motor that is making a modulated buzzing noise. The vibration in the horizontal planes of both bearing housings has increase from 0.1 IPS-...
0
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1answer
661 views

How to test a laptop keyboard from its ribbon cable

Is there a way to test a laptop keyboard from at its ribbon cable, fully disconnected from the motherboard? Some kind of switch continuity or something along those lines that would indicate whether a ...
1
vote
3answers
1k views

Should a capacitor be considered functional if it's capacitance reading is correct?

There are many different ways to test capacitors. Using a capacitance meter, using a DMM and an analog meter. In general, is it safe to assume that a capacitor is considered functional if it's ...
1
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1answer
46 views

PSU for Ampacity test of connection

i have this problem. I have to validate with a test that my connection on my power board can carry the nominal current required by the specs. For current around 10A the setup I'm using is a ...
8
votes
2answers
2k views

How do you identify Pin 1 based off these pictures? [closed]

This is a test question in a study book about electronics. I cannot find the answer and have no idea which picture identifies a pin. Am I missing something? Any help on the right answer along with ...
0
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1answer
62 views

Smartphones - are they fully functionally tested?

Smartphones are among the most complex devices ever produced. When they are being manufactured I assume each subsystem is independently tested for functionality. However, is the final finished product ...
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0answers
46 views

Should I get a multimeter to check size of voltage to avoid damaging a logic analyser?

I am looking into getting a Saleae logic analyser for a project to reverse engineer an electronic display and buttons for use with a RaspberryPi. I think it should be OK as I would doubt, by my own ...
1
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1answer
245 views

Testing Power Supply Variac-Rectifier-Cap

I have built a power supply with the following order. Variac-Full Wave Bridge Rectifier-Capacitor. I get the input from the wall. I connected neutral and line to the rectifier. Not using the ground. ...
0
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0answers
59 views

Reduce amount of I/O required for automated switching

I got a device with a 16-pin connector. One of the functionality tests consists of shorting every pair of pins (the first with the second, the third with the fourth, etc.) and measuring the voltage ...
0
votes
1answer
114 views

How can I properly test compatibility of a replacement led on a pcb?

I am looking to replace an led on this board, but I am unsure of what this current led's specs are in terms of what amperage and voltage are used by the led. I am curious what ways I can test to make ...
1
vote
1answer
39 views

Making controlled power surges

I'm planning on testing three different circuits for their response to a power surge (in the event that a surge protector fails). They'll each be drawing 5V power from an AC to DC power supply and ...
0
votes
1answer
103 views

Is there a professional field/classification for people who do test-engineering?

Through my career so far, I have always done work involving developing software to test electronics. This has involved writing diagnostics in embedded C/C++ for ARM controller, and even such high ...
2
votes
3answers
146 views

Testing a circuit systematically and efficiently

I need to determine a circuit's response to variations in component values. What are common go-to methods for this? Background: I'm a growing novice in electronics design. So, my question is about ...
3
votes
3answers
376 views

What security risks does the Test Access Port (TAP) introduce?

Trying to get my head around the JTAG world I looked at how the Test Access Port (TAP) works and although I get why we need it, the diagram seemed to me (as a software developer) introducing some kind ...
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3answers
77 views

What does high fault coverage digital vector at an IC module mean?

I'm reading some specification docs on some integrated circuits and I came a cross this definition which I'm trying to understand. This provide the capability of running high fault coverage digital ...
10
votes
3answers
35k 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 ...
1
vote
2answers
109 views

How to maximize microcontroller temperature?

I need to test how hot a specific microcontroller can get in different situations. The goal is to have the microcontroller heat up as much as possible just by using it. I was thinking I'd need to ...
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votes
2answers
465 views

I need to be sure that these are right values for MOSFET 2N7000

I made A circuit for test mosfet in proteus But according to datashet the values are incorrects. I need your help : Is it normal these values ? For example : V(gs) in my circuit is 4 volts and ...
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1answer
213 views

Intel 8042: what are “test inputs”?

I've implemented a driver for the Intel 8042 (keyboard controller in the IBM PC AT). The IBM 5170 (PC AT) Technical Reference served as my, well, reference for that. The output port and the test ...