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Questions tagged [testing]

Proving the proper operation or finding faults in an electrical device. It can be done using electronic test equipment or by a software-based simulation.

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Tinkercad multimeter doesn't work [closed]

Measuring voltage and current in Tinkercad, tell me why the voltage does not change when connected in series and the current in the circuit does not change when connected in parallel.
Foma Loktionov's user avatar
1 vote
0 answers
47 views

How to test Keychron K3 Pro PCB LEDs

After plugging Keychron K3 Pro keyboard to USB port on Tesmart KVM switch (used not original power adapter maybe it worked not stable), after 10 min of working keyboard and mouse unplugged and light ...
Lion's user avatar
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1 answer
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3.3V regulator and Comparator not working as anticipated

This is my first time designing something like this so excuse my inexperience. My objective here is to create a simple circuit for checking if a particular component is good or has been damaged. From ...
John Lapinski's user avatar
1 vote
1 answer
53 views

What ways can I test an NiMH battery aside from capacity

In my current job, I take used prius batteries and recondition them. I put them on RC chargers and the modules through charge/discharge cycles to both measure and raise the capacity. They have an ...
crispYpickle's user avatar
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1 answer
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Test that plug is wired correctly

I am looking to build a tester that is verifying that 12 VDC connectors are wired for the correct polarity. It will have a series of plugs for a wiring harness and a switch for each one with a red ...
Caddrawer's user avatar
-1 votes
1 answer
62 views

How to test potentiometer with 4 In Line terminals [closed]

I need to test 3 identical Claro potentiometers that have 4 In Line terminals, (not 3 together and one elsewhere as others have asked about). These are Claro EPVR/341 potentiometers that are also ...
MickRanger's user avatar
1 vote
1 answer
86 views

How to confirm PNP transistor is valid?

I am practicing with some basic circuits based on bipolar and MOSFET transistors and have faced with an interesting behavior. I have to extract my PNP transistor from a circuit and have found it ...
Gleichmut's user avatar
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2 answers
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Semiconductor device testing [closed]

I'm a graduate engineer who's recently started a job testing silicon wafers consisting of both power MOSFETs or diodes and some IGBTs. Unfortunately there's little in terms of support and training ...
TheMelon2012's user avatar
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3 answers
52 views

How do I test a MOSFET/IGBT for its maximum current and maximum voltage mentioned in the datasheet practically?

I am using an IGBT from Infineon (IGW25N120H3FKSA1). The datasheet mentions that the absolute maximum ratings for the IGBT are Vce(max) = 1200 V and Ic(max) = 25-50 A (depending on temperature). How ...
Sudhanva Gokhale's user avatar
1 vote
1 answer
60 views

Ethernet cable testing

I'm working on designing a device to identify ethernet cables after they have been installed. I've designed a circuit that will send a DC high signal via one wire and then returned over the remaining ...
Paul B's user avatar
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3 votes
3 answers
804 views

What is expected resistance of MCU power supply pins?

I've assembled several identical boards and one of them does not work. Visual inspection does not show any bridges, but it is hard to tell with LQFP pitch. The voltage on power rail was zero. I've ...
Maple's user avatar
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1 vote
1 answer
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Near field probing on a large DUT

I "inherited" a set of boards (it's an elevator controller) that have no 'explicit' EMC countermeasures except a single CM choke for the CAN bus. And, of course, now the whole thing need to ...
Lorenzo Marcantonio's user avatar
0 votes
1 answer
72 views

How can I verify the operating specification of a PCB? [closed]

I have a couple of PCBs which work with each other: core PCB, middleware PCB and a peripheral PCB. All of them have a voltage and current rating along with protection circuits. What tests can I ...
Varun Dhaka's user avatar
1 vote
1 answer
59 views

Can diodes be tested successfully in situ? [closed]

I have tested a bunch of diodes in situ on a washing machine PCB. One comes back as expected with values of 0.6v and OL depending on testing direction. The rest show the same 0.6v in the expected ...
watsoft's user avatar
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4 votes
2 answers
153 views

What type of probes are used to connect to plated-through-holes without soldering a pin into the socket? [duplicate]

Are there probes that are designed to insert snugly into 40-mil holes (about the size of those needed by a DuPont connector)? I am thinking of something that looks like a banana plug with springs on ...
KJ7LNW's user avatar
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How do you de-embed a shorted 2-port fixture?

I've been working through reproducing Steve Sandler's 2-port shunt-through measurements (2019 SIJ article, Picotest slide-deck). My target is to measure capacitors with ESR down to 1 mΩ with an ...
Daniel's user avatar
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2 votes
4 answers
791 views

How does the spring loaded pogo pin retain its compressed position?

As per wiki Pogo pins are used for their improved durability over other electrical contacts, and the resilience of their electrical connection to mechanical shock and vibration. I am not able to ...
Dynamic_equilibrium's user avatar
2 votes
1 answer
133 views

Piezo buzzer testing for defects using electrical parameters

I am looking for methods to verify whether a Piezo is damaged/defective or good. Are there ways to verify that using just electrical parameters like resistance, capacitance etc. My issue is that it's ...
Anurag Kumar's user avatar
0 votes
2 answers
195 views

Multimeter won't read resistance

I have an issue with my digital multimeter (Flir DM66). It won't read resistance. I've tried reading dc voltage and continuity, both work fine. But when I try resistance, it shows 0.8 when touching ...
Lovely Noises's user avatar
1 vote
0 answers
93 views

How to determine your ground is connected to earth

I have a tester at a remote (international) site that has been having test failures. We traced the problem to a noise issue. We were investigating the noise issues with the test/tester and ...
markshancock's user avatar
0 votes
1 answer
93 views

High voltage testing of multi core cables

I was going through Indian standards for high voltage testing of multi core PVC insulated cables (Up to 1.1kV). Can someone please guide me with the following two points. A) Connection to be done in ...
Nikhil Kashyap's user avatar
1 vote
0 answers
116 views

Testing a 24V motor - Can I simply connect posts to a 12v battery?

I need to test if a 24V motor works or not. How can I test this just to make sure it functions? Is it possible to simply connect a 12V battery to the 2 motor posts and see if it spins, then reverse ...
RocketManZ's user avatar
0 votes
2 answers
88 views

163 A - 400 Hz CT Testing For Aviation Generator Application

What power supply equipment could I use to provide a 400 Hz, 163 A rms supply to support the testing of a wound Current Transformer installed to an aircraft power generator? The test requirements are ...
Steve 's user avatar
1 vote
0 answers
58 views

Earth Resistivity Test on concrete base

I am planning to conduct an Earth Resistivity Test on my property. The issue is that my building's basement is entirely covered with concrete and pavement, and we intended to use the Fall-of-Potential ...
IT Researcher143's user avatar
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1 answer
89 views

How can I test IC LM2903 TSSOP8 with multimeter on the circuit board to see if it works?

I have IC LM2903 on broken circuit board, and I want to check it with multimeter. I'll be very thankful on any advice or answer. Images from ST LM2903 datasheet
Leo's user avatar
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0 answers
41 views

How to get a voltage range of -1.5V to 1.5V using batteries combination of 3V and potentiometer

How to get a voltage range of -1.5V to 1.5V using batteries combination of 3V and potentiometer. So for the details, I'm using batteries of 1.5V each, which are connected in series such that output is ...
Manshi Yadav's user avatar
0 votes
3 answers
185 views

How to find out if the PIC microcontroller is good or dead?

I am working with a PIC microcontroller (part number dsPIC33FJ64MC802). Previously I was able to program it fine. But today, I have powered the PCB which contains the PIC microcontroller, then ...
Vikram's user avatar
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0 votes
1 answer
76 views

What is expected error rate and drop rate on ST-Link VCP USART?

What is expected error rate and drop rate on ST-Link VCP USART? On the Nucleo STM32F446RE, my code reads the USART VCP (of ST-Link) and echoes it back. It uses DMA, FreeRTOS, and FreeRTOS queues (...
SRobertJames's user avatar
  • 1,135
2 votes
1 answer
243 views

Creating a test jig for a large PCB Backplate

I am a recent graduate working on a side project that involves creating a test jig/method for a large PCB backplate. Unfortunately, the original layout and diagrams are no longer available, so I need ...
mw599's user avatar
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0 answers
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How to determine delay of sensor response after the stimulus event (with oscilloscope?)

I’d like to determine how long it takes a digital sensor to go low after the stimulus event (Ir break beam). I have no problem getting a trace from sensor: I can see it start to drop, the slope, ...
Playing with GAS's user avatar
1 vote
1 answer
406 views

Mean Well Power supplies have much lower efficiency and much higher leakage current than rated

I am going to have a power supply which will always be connected to AC mains and occasionally, a led strip will be connected and disconnected to the supply with a relay. I want an efficient and low &...
CaveScientist's user avatar
2 votes
1 answer
232 views

How can I check continuity longer than my probes?

I'm trying to sleuth out a wrongly wired connection on a small injection molding machine. I'm starting by verifying the connections match the diagrams from the manufacturer. However, some of the ...
Maxthecat's user avatar
  • 125
7 votes
6 answers
855 views

Measurement of relay characteristics so can detect before failure

I am working with a very large safety system which was designed around 30 years ago. It has a system of relays interlocked together in a logic configuration so that it will failsafe if any relay ...
REPuzzle's user avatar
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3 votes
2 answers
147 views

What ground pad should be put on a PCB for testing?

When designing a PCB, it's common to place pads as test points. What about ground for test? Should I just place a pad connected to ground? The problem is that it's hard to manually hold probes to two ...
SRobertJames's user avatar
  • 1,135
0 votes
1 answer
302 views

2A223J fixed capacitor immediately shows OL on resistance test

I have a 2A223J fixed capacitor. When set in resistance mode, I'm showing OL when tester leads are touching each (separate) capacitor lead. I just tested a new .22uF capacitor and i saw resistance ...
a coder's user avatar
  • 103
0 votes
2 answers
136 views

How to write tests for a clock signal

I am using GHDL to create an entity called HEARTBEAT, which is a simple clock signal. I already wrote some testbench for other entities like AND or NOT gates. Now I am wondering how can I write tests ...
chick3n0x07CC's user avatar
0 votes
1 answer
90 views

Percentage difference of winding measurements

I am trying to learn more about the proper winding measurement of power transformers. In this regard I am following this tutorial https://www.youtube.com/watch?v=3HIEIoa4NKA&list=LL&index=2. ...
k1gabitzu k1gabitzu's user avatar
0 votes
0 answers
106 views

Megger terminals clarification

I saw that some meggers inject the test voltage / current from the - (minus) terminal while do this from the + (plus) terminals (don't know why, it probably depends on the manufacturer?) Currently I ...
k1gabitzu k1gabitzu's user avatar
-1 votes
2 answers
155 views

Self testing PCB [closed]

Is there a way that I can test my PCB by myself (if it works properly or not) before sending the design to the manufacturer? Like if Altium has some kind of feature like that? Or is there other ...
AlAnood Ballan's user avatar
3 votes
1 answer
102 views

Can I use a contact microphone to detect a fan running / not running inside an electronic product?

I'm involved in thermal testing of an electronic product which contains a small centrifugal fan. The product is entirely sealed and no signals can be transmitted through the case when it's operating. ...
anon33's user avatar
  • 53
0 votes
1 answer
51 views

How to isolate multiple 24 VAC to 5 VDC power supplies (buck converters) that are all powered by a single main transformer with a common pole?

Basically, I am trying to test multiple relay controlled outputs that are all 24 V outputs. One pole of the transformer is going into a relay for each device and the other side of each device is ...
Tesla's Curiosity's user avatar
0 votes
1 answer
36 views

How do you choose the right load for reliability testing?

I am an automotive reliability and test engineer. I do environmental or electrical tests and during these tests I need to load my products. By load I mean, for example, there is a mosfet driven by a ...
Taha Füzün's user avatar
0 votes
1 answer
44 views

Does the quality of USB cable affect the power drawn?

I was wondering how the power drawn is affected by different cable? I tested two different types: A USB cable plugged to a USB digital tester which showed a power of 4.88 V and 2A drawn, whereas the ...
Sujith's user avatar
  • 9
2 votes
1 answer
117 views

What extra battery information do you get by using a two tier dc load method VS the one tier method?

I learned that these of these two methods the one-tier method can only measure the internal resistance of a battery but you get more information from the two-tier testing method. However, the resource ...
Matthew3302's user avatar
1 vote
1 answer
221 views

Can products be imported to US for Beta testing without FCC certification

We need to import two products that are newly designed and operate on wifi and BLE. We are planning to get them for beta testing. We have talked to a few interested parties where the products will be ...
vkbb's user avatar
  • 21
2 votes
2 answers
136 views

Is there something like a banana plug that will fit in a 30mil or 50mil through hole test point?

I am developing a cost sensitive product. The printed circuit boards need to be programmed and tested. It seems like a waste of money to put a programming/test connector on the board just to use it ...
user4574's user avatar
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0 votes
1 answer
123 views

Synchronizing signal generators with shared LO

I'm currently trying to test my ADC chip using two signal generators. Below figure visually illustrates how the test setup would look like: The traditional approach uses a 10 MHz reference port to ...
Emm386's user avatar
  • 607
-1 votes
1 answer
162 views

How to test photo interrupters

I have come upon two photo interrupters in a calibration kit circuit. The circuit seems to not respond. How can I check these photo interrupters? The green LED is responding when an object is brought ...
Sujith's user avatar
  • 9
1 vote
1 answer
99 views

Screw Terminal Test Clip

I have a board fitted with a 10-way 3.5mm screw terminal in a similar style to what you see here (GSO14V-3.5): I am after a reliable contact to four of these points for testing purposes, without ...
Sam's user avatar
  • 11
2 votes
2 answers
964 views

How to test Raspberry Pi Pico after soldering header pins?

I just got my first Raspberry Pi Pico and I don't have any experience in electrical engineering. The book I'm following indicates that I first have to solder the and the first step is to solder the ...
Jens Wagemaker's user avatar

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