Questions tagged [test]

A definitive procedure that produces a test result.

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98 views

MOSFET Driver IC Testing

I have this MOSFET Driver IC Datasheet. This is in follow up to this question. I want to validate the block by testing. My block specifications - Input Gate Voltage -5V Drain to Source voltage Range : ...
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2answers
58 views

How to run double main in same project? [closed]

I imported unity test harness to my project and seperated them from my production codes. As you know, there is a main belongs to my project and there should be another main to run tests. If I try to ...
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1answer
53 views

The choice of method for constructing hardware monitoring and diagnostics

created a weight scale device. I chose the software method for diagnosing my system. How can I implement it? X1 is a load cell 5000 grams DA2 HX711 D1 Atmeaga328 D2 shift register H1 lcd display ...
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1answer
34 views

Built in Self Test - In Embedded memories

I am reading this thing called -BIST (Built in Self Test). I understand that, before a module enters its intended functionality, this BIST is made to run within the module. Once, this BIST is passed, ...
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7answers
2k views

Testing process before PCB assembly

I have a specific question regarding test and verification of circuits on PCBs such as the following one: Since I am not from the electronics industry and never been in such a place I thought someone ...
4
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3answers
402 views

How to test desert (Dubai-like) conditions when you are in a temperate climate

I would like to stress test an electronics device in desert (think it like Dubai) conditions, such as 40-45 degrees Celsius = 100+ degrees Fahrenheit with direct sunlight and zero humidity. I live in ...
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1answer
66 views

How do I make a battery voltage indicator using the battery being tested?

I am trying to make a circuit that will test if a 5V battery is under 5V, with the testing circuit running off the battery being tested. I have seen other answers to this question, however they rely ...
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1answer
40 views

How to find out which side of transformer the OC and SC tests were performed?

I have this problem which states that in a single phase transformer 2200/110 50kVA No load and short circuit specifications are like below, How to find out which side of transformer were the tests ...
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2answers
35 views

Test Verilog FSM for state with no reset

My professor gave us several Verilog test files to write Verilog test benches for. In the test bench, we're supposed to initialize the state to 0, apply random inputs, and check to see if we have ...
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2answers
60 views

Oscilloscope probe points

The answer to another question identified two PCB-mounted scope probe "holders": I can't find these at any distributor's web site because I don't what they are called. Can someone, please, give me ...
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0answers
23 views

VT ratio measurement

I need some help to understand the theory behind a test in a voltage transformer. Here is the thing: Recently I performed a test in a voltage transformer in order to check its turn ratio and we did ...
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1answer
33 views

Open and short test for 2 ground pin

If a device has two ground pins. Using the normal open and short test will not tell if one ground pin is open and the other is good. How to detect this kind of situation? Thanks.
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0answers
73 views

Schottky diode EAS test circuit

I'd like to test the non-repetitive avalanche energy (EAS) of a particular Schottky diode (VS-12CWQ10FN-M3), but I've never done this test before and can't find a typical test circuit. This comes from ...
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1answer
57 views

Measuring 150kHz, ~30V peak waveform with good resolution

I am trying to choose test equipment for a systems test application and I am running into a road block with one of the specs I need to meet. The device features an H-bridge output similar to the ...
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0answers
54 views

USB 2.0 Signal Integrity Using HSETT

I am trying to test USB 2.0 Signal integrity (Eye Diagram). For doing that, USB IF Forum lets you download the EHCI HSETT Software from their website. However, I am not able to use it due to one ...
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0answers
86 views

RS485 - Comunication lost during EFT IEC 61000-4-4

I'm having throubles with communication over RS485 in harsh industrial environment. We perform test in EMC lab, acording IEC 61000-4-4 = Fast transient (also known as Burst). We used burst generator ...
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1answer
64 views

Applying Ripple to a DC Source?

I have a system that is powered by a 25V Lithium ion battery pack. I need to test the system with a 1 Vpp sine applied on top of the 25V supply, so 25V +/- 0.5V ripple. I know theoretically to get ...
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0answers
13 views

What's the best dielectric breakdown test sequence for a DPST switch?

Please could you help me to check my understanding of dielectric breakdown testing? I’m only a humble mechanical engineer so I’m a bit outside my comfort zone. A product requires dielectric ...
3
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3answers
321 views

Should you Megger test transformers?

I have heard people say you shouldn’t Megger test transformers because the high voltages used might cause insulation between windings and between windings and the core to breakdown. Is this true? ...
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3answers
245 views

Power Supply Earth for Bench Testing

I work in a typical electronics lab, with resistive earth mats, ESD straps and isolated DC power supplies to test prototype PCBs. I prefer not to use the power supply earth-ground, and to leave the ...
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4answers
367 views

Temporary but hands-free JTAG/SWD connection

I have a PCB that will have very little clearance on both sides so that putting a normal Cortex SWD .50 spacing connecter is too big. However, I'd still like to have the option of connecting via SWD ...
2
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2answers
1k views

How do we test and determine if a USB cable+connector is version 2, 3.0 or 3.1?

How do we test and determine if a USB cable+connector is version 2, 3.0 or 3.1, without using port, PC and/or having data transfer but instead with basic physics tests e.g. using multimeter?
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1answer
131 views

Is there a good way to test your schematic before buying the parts and building it?

I'm trying to design a BMS that can handle 12 cells, be powered either with a isolated dc-dc converter or the batteries themselves and uses active balancing, but I'm not sure if my design will work:
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2answers
1k views

How to test a TRIAC with just a digital multimeter and no external circuit

I need to fix an electric kettle and would like to test the health of the TRIAC BTA20. How would you test this component health with a digital multimeter - without any extra components and ideally ...
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1answer
406 views

Build In Self Test LCD

I've recently been trying to get a custom LCD (ET101005DSAK0) connected to an Embedded System on Module however without any success. When debugging why the LCD is not working I wanted to make use of ...
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1answer
148 views

Electronically verify whether cable is connected to RJ45 connector

Background: I have a device that interfaces with a motor controller over RS-485 via an RJ45 socket. Currently, the port is a standard 4x2 RJ45 connector with the RS-485 using pins 2 and 7 Currently ...
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2answers
86 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 ...
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1answer
301 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
82 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
47 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 ...
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1answer
723 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
116 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: ...
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2answers
2k 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" ...
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1answer
1k views

Amateur radio practice exam question about voltage drop

So the question is as follows: ...
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2answers
459 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
130 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
49 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 ...
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3answers
903 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
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1answer
262 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
148 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 ...
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1answer
143 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 ...
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1answer
1k 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
130 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 <...
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1answer
36 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
46 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
135 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 ...
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3answers
70 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
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2answers
340 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
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1answer
106 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 ...