Skip to main content

Questions tagged [test]

A definitive procedure that produces a test result.

Filter by
Sorted by
Tagged with
0 votes
1 answer
30 views

Checking battery capacity of 7 amp 12 volt AGM batteries for UPS

I have several 1000 watt Triplite sinewave UPS. The batteries had a date code of 2021 and testing with an 800 watt resistive load ,two heat guns,I was getting around 3 minutes run time,specs state ...
Tom Schulze's user avatar
0 votes
1 answer
39 views

Using a 555 Timer to Connect to An Asynchronous Counter in Proteus

I'm trying to drive a binary asynchronous counter via the following setup though usually if I see binary counters they are connected to a 'CLK' source of some sort. In an ordinary case, the circuit ...
MechatronicsStudent's user avatar
0 votes
0 answers
33 views

Double pulse testing the first transients on the current

I would like to comprehend what represents the first pulse on the ID current of the LS and HS in double pulse test configuration. I have the circuitry as shown: LS is my active switch, when I turn ...
Kurt Müller's user avatar
-1 votes
3 answers
51 views

Where or How can I make AC adjustable load for 120? [duplicate]

The thing is that I want to test the efficiency of some DC-AC inverters but I have to use an adjustable load because the CEC or EU efficiency weighted calcs request to have the perfomance on 5%, 10%, ...
Angelo Lorenzoni's user avatar
0 votes
0 answers
33 views

Parametric or Template test by Ethernet Compliance Test

I am trying to design this part of TC6 from Ethernet test fixture board. As I dont need rest part of the parts for my test. Can someone tell me what are the loads are? Here three different loads can ...
Alok's user avatar
  • 1
0 votes
2 answers
140 views

Get practical crystal tester working

After working with quartz components in circuits, I planned to make a test on them in order to be sure if they are really still working as they are supposed to be. I found this circuit on the internet:...
user avatar
0 votes
1 answer
95 views

Question on testing transistor TIP120 NPN using multimeter

Could someone please help to confirm if these values for a TIP120 NPN transistor based on the diode setting of my multimeter, indicate any potential fault? Base (Positive) with Emitter (Negative): 0....
user21971539's user avatar
1 vote
1 answer
44 views

EMC and Control Area Networks [closed]

With radiated EMI tests, do we need to take into account the communication cabling and its influence on EMI? I can't seem to find one standard that describes how CAN busses should be configured in EMI ...
Tony's user avatar
  • 187
6 votes
4 answers
1k views

Experimental and theoretical determination of MOSFET threshold voltage

I am working on a project that requires me to extract the proper value of the threshold voltage of a particular MOSFET. I know that VT is quite arbitrary in its definition. I've researched the subject ...
Virgil_Tibbs's user avatar
0 votes
0 answers
25 views

Determining specs for a power supply for a mystery motor

I have a set of 4 motors for an automatic backdrop system for a photographer studio. How can I determine what I need to run these? They would normally come with a box with switches that operate them (...
Brennan Arceneaux's user avatar
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
8 votes
3 answers
938 views

How to achieve coherent sampling in practice

In the context of measuring a sinusoidal source with an ADC, coherent sampling (i.e. capturing an integer number of periods) allows the use of a rectangular window without spectral leakage. How does ...
DavidG25's user avatar
  • 1,360
5 votes
2 answers
659 views

Do EMC test houses typically accept copper foil in EUT?

Working with small volume product and tight schedule it might become an option to pass EMI limits by use of copper/aluminium foil on inside of enclosure. What is your experience with the labs on this ...
NoobPointerException's user avatar
0 votes
0 answers
53 views

How can I test an LCD with an RGB port?

I want to test this LCD. When I connect its power, the message "no signal" appears on the screen. How can I send a simple signal to it for testing?
Kiani's user avatar
  • 21
-1 votes
1 answer
107 views

ADC test techniques

Why do we need to test the features of an ADC like INL, DNL, offset, and error? And in addition AC specs like SNR, SINAD, THD, etc. These parameters are in the datasheet prepared by the manufacturer. ...
bb0667's user avatar
  • 115
1 vote
2 answers
244 views

How do I establish if an op-amp is bad?

I have a JRC2374 SOIC8 IC on my board which is not powering up. The IC seems to be involved in the power regulation switching operation. Here are the internals from the datasheet: I know little ...
Andyg's user avatar
  • 51
0 votes
1 answer
190 views

LM4562 test not working

I got some LM4562 op-amps a few months ago and finally had time to test my audio project, and I realized that this schematic based on some others on the network is not working. I tried to listen to ...
Nayara's user avatar
  • 5
0 votes
2 answers
159 views

Capacitor decade box

I'm assembling a capacitor decade box. It will be used to tune circuits both in power & high frequency electronics (but, probably not GHz RF; with all the parasitics). So, I need it to be as low ...
Tempus Nomen's user avatar
0 votes
1 answer
172 views

How would I test forward voltage?

I tried to test an LED but my multimeter only displays 0L. Does anybody know what to do if it doesn’t have a select button?
grozan programer's user avatar
2 votes
1 answer
45 views

Why I am having x as output from ReLU?

I am trying to test ReLU, but it always gives 'x' for the output. ...
Ghadeer Ali Jaradat's user avatar
0 votes
0 answers
27 views

RF test socket pin max power handling capability

Do RF test socket pins have a max RF test power handling capability specification? Most RF pins that these sockets touch do have this specification. However, I don't see it listed for socket pins. ...
Ted's user avatar
  • 21
1 vote
1 answer
358 views

Where can I find information about "Enhanced Policies and Procedures Exam" for IPC?

I'm taking the CSE test for IPC-J-STD-001 and at chapter 7.Certification Exam Overview, I can see that there are 3 types of tests. Policy and procedure test (10 questions) Closed book test (25 ...
euraad's user avatar
  • 1,324
0 votes
2 answers
146 views

CPU test pins (test as a noun)

Looking at the FM2 socket for AMD processors I've noticed that there are some "test pins", i.e V22. What are they for? Is it possible to manage them, i.e for some led signaling?
perencia's user avatar
  • 234
1 vote
0 answers
60 views

How do I know that the isolation tester is doing its job?

I am measuring the isolation resistance of a device where the measured value is within the range of just measuring with the test probes hanging freely in open air. 1 kV gives values in gigaohm range. ...
ISbit's user avatar
  • 23
0 votes
3 answers
431 views

Testing pulse drain current of a MOSFET

What's a good rig to test the pulse drain current of a MOSFET? I'm thinking using a gate driver very abruptly raise the \$V_{GS}\$ from 0 to the \$V_{GS\_max}\$ for the same period in time as in the ...
Tempus Nomen's user avatar
0 votes
0 answers
65 views

Automated Hardware/Software Test

I am an Electrical Engineer and I don’t have a strong Software Engineering background. My problem is: I need to test several Smart home devices. For example: a door that opens and closes (also 2 ...
Caio Miguel's user avatar
0 votes
1 answer
209 views

Hardware testing of the 1:1 connection for opens and shorts

I have a board (DUT = device under test), featuring (in addition to other things, which are not important for this question) 2 connectors - A and B. The connectors are connected 1:1 at the DUT. ...
ethcz's user avatar
  • 210
0 votes
0 answers
458 views

DIY transformer winding, "Light bulb test"

I "hack" cheap "electronic transformers" for use as filament supply for my tube amplifier projects. They operate at about 50KHz so there is no audible hum (a particularly annoying ...
Joe's user avatar
  • 199
2 votes
0 answers
203 views

Electrochemical Gas Sensor Potentiostat Circuit

I guess this is more of a review request than a specific question, but I was wondering if anyone has any experience with electrochemical sensors and the required circuits for gaining accurate ...
RSA5000's user avatar
  • 21
0 votes
1 answer
775 views

What is the most reliable way to test old capacitors?

I have a few old electrolytic capacitors from an old system that have not been used in many years. I was thinking I might test them. What is the best way to reliably test these old caps?
alfredo2g90's user avatar
0 votes
2 answers
207 views

Efficient discharge of capacitor voltage to 2-10 ohm DUT

I need to apply the voltage in a capacitor to a load (between 2 and 10 Ω) and need to have the most efficient and simple method to do so. The goal is to apply power to a DUT (device under test), ...
oaktubs's user avatar
  • 13
0 votes
1 answer
34 views

Clock network remains at x when applying fast clock frequencies

I am required to test how a design behaves if it is run with extremely fast clock frequencies (higher than the maximum frequency allowed by timing constraints). The goal is to detect what kind of ...
O'ara's user avatar
  • 1
0 votes
0 answers
34 views

Why is insulation resistance is bad when absorption Ratio ≈ 1 and insulation resistance is good when absorption Ratio >1.25 or 1.3?

i will do absorption Ratio (AR) test for transformers in my job,and i know how to calculate the absorption Ratio AR=\$ \frac{R_{60}}{R_{30}}\$ \$ R_{60}\$=Insulation Resistance after 60 second test \$ ...
user16266657's user avatar
0 votes
1 answer
118 views

What do you test when changing parts [closed]

Let's say some parts within one of your products are discontinued. You already have a replacement that seems to fit from specifications. What tests do you usually conduct to verify proper operation? ...
NoiseEngineer's user avatar
0 votes
0 answers
117 views

How to select an appropriate tone spacing for intermodulation distortion testing?

Intermodulation distortion measurements require (at least) two closely spaced carriers combined before going into the DUT. I understand the basic theory but have not grasped the effect of the choice ...
user3507914's user avatar
0 votes
4 answers
85 views

Measuring Li-ion battery manage to get a number in mAh

How can a circuit functioning to measure Li-ion or else type battery manage to get its mAh capacity, how is this circuit's method ? EDIT Known it from a reviewer fed into an e-commerce site I forget (...
user avatar
1 vote
2 answers
130 views

LED check circuit on startup

I wanted to use a sensor which should indicate low fluid level with a LED. I don’t want to have a non working LED in that circuit and want it to be automatically checked everytime the circuit powers ...
abdussamed17's user avatar
1 vote
3 answers
259 views

Soldered test point on production board?

I understand having test points on a production board, but what would be the point of selectively soldering some of them? It doesn't modify any resistance, right? I assume that the large numbers of ...
Nolan Hergert's user avatar
1 vote
1 answer
192 views

Building custom hardware for programming boards with microcontrollers

I have a PCBA that includes a MSP430 microcontroller and another module. The connection is shown in the photo below where the former (MSP430) is at the bottom and the top is for the other module. ...
sdbol's user avatar
  • 113
8 votes
2 answers
3k views

How to program MCUs and test PCBs in mass production?

I am working on a PCB which includes an microcontroller (STM32), some sensors and a BLE module. Right now it is still a prototype, only 3 units have been produced. To program the microcontroller, I ...
JackOfHearts's user avatar
0 votes
2 answers
758 views

Identify live or neutral in 2-way switch

I have a 2-way switch connecting to a light and it works properly. When opening it up, it has 3 inputs with the same wire color. I don't know the setup and I wish to know if there is a neutral in one ...
DayDayHappy's user avatar
2 votes
1 answer
347 views

How to go about debugging PCB Power Supply Circuits to ensure correct output voltage?

I'm currently soldering, testing and validating the components on this PCB that I designed a few months back. As it is right now I have soldered the 1.2V, 2.5V, 3.3V and 5V buck converter power ...
JAlbers's user avatar
  • 55
22 votes
5 answers
4k views

How can we test the lifespan of electrical components?

We work with some electronic devices in our projects. We are at the stage where we need to create some test strategy to validate the lifespan (e.g. 1 to 5 years) of our devices for which we provide ...
MKSJ's user avatar
  • 229
0 votes
0 answers
453 views

How can I test whether my 3 wire electric motor is broken? [duplicate]

I have a motor that I'm trying to work out if it's faulty or not. The motor make and model is EMC RB2C-190-060 K010 (photos below) - 230V ~ 50/60 Hz 2μF-450V 65/90W 0.3/0.4A The motor has four wires ...
Philip's user avatar
  • 1
0 votes
1 answer
37 views

Vdd rise test in real life

I want to simulate VDD rise. For example I want to raise 1.2V VDD to 4-5 Volts for tens of microseconds and lower back to 1.2V. Suppose I have a high rise and fall time pulse generator (200-500 ...
bbilgic's user avatar
0 votes
2 answers
1k views

How to troubleshoot low-voltage home lighting system from 50s

My home, built in the 50s, has a Sierra low-voltage lighting system, where low-voltage 24DC switches control relays that power the normal 120AC lights. In the last week, the switches have failed ...
reynoldsnlp's user avatar
1 vote
2 answers
538 views

Measuring the capacity of a 40v lithium ion, lawnmower battery

I purchased a 40v Greenworks lawnmower battery, and it's listed capacity (6,000 mah) doesn't seem to be accurate based on what I'd expect to get out of it when mowing a lawn. How would you go about ...
Jeff's user avatar
  • 111
1 vote
2 answers
671 views

Noob soldering help: test pad repair

So I haven't soldered in years and only have experience with through hole soldering and large components. Today I attempted a repair with a HTC Vive controller. I know where to solder and managed to ...
Z.Davey's user avatar
  • 11
1 vote
2 answers
181 views

MC1314 voltage controlled attenuator circuit not working on breadboard - what did I do wrong?

I have an old quadraphonic system with a problem that I've traced to what I think is an MC1314. (That's not the question.) So I ordered a replacement, popped in and it didn't solve the problem. I ...
Duston's user avatar
  • 181
0 votes
1 answer
106 views

Vector Network Analyzers: Bode100 vs Keysight P5000A

I have been using Bode 100 machine earlier to measure Impedance and Phase of my piezoelectric transducer. The frequency range i work in is from 10kHz to 2.5MHz. I was just comparing this Bode100 with ...
user135156's user avatar

1
2 3 4 5