Questions tagged [testing]
The testing tag has no usage guidance.
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2answers
60 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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0answers
47 views
EEPROM and Flash testing
I am looking into the best practices for EEPROM and Flash memory testing. We are talking about end of line product testing by an ATE. The goal is to identify defect chip before writing memory content. ...
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1answer
45 views
Burn In component testing
For pre and post electrical testing of burn in components under test: what is the best way to measure current and voltage through said burn in components before and after burn in to verify if the ...
1
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2answers
32 views
Input power requirements for “load regulation” tests on DC power supplies
My question is this: What is the convention, if any, for specifying a power supply's input voltage value when performing a load regulation test?
Background
A typical specification for DC power ...
3
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0answers
26 views
Altium testpoints auto-placement
Is there a way to use Altium to automatically generate testpoints on an already routed board? When there is no usable via, I'd like to place a pad on the net.
When reviewing altium API reference ...
1
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0answers
65 views
switch without diode
I have a project where I need to put a switch in between the resource from tester and the DUT.
My DUT is a 48 pin device (semiconductor IC), each of the pins has its own ESD diode. The switch, for ...
-1
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1answer
29 views
order of detecting the manufacturing faults. stuck at faults after transition faults
I have a couple of question. Can anyone please explain me these statements.
Can we use at-speed to detect stuck-at faults? If so how? and is it advisable?
why stuck-at fault testing coverage numbers ...
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0answers
33 views
Stuck at and Transition fault -Capture operation DFT
So I have some questions, I know some valid reasons for these but I'm thinking they might be wrong assumptions. so Can anyone please answer my questions.
In general,
A stuck-at fault model purely ...
1
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2answers
27 views
Product Safety Testing - EU
I was recently hit with the thought as to what safety tests a domestic electronic product has to go through before it is sold to consumers more specifically in the EU?
I have been looking through ...
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1answer
21 views
Understanding Transition faults
I learned that the transition faults model checks whether data transition meets the clock or not
Transition Faults : Assumes large delay defect concentrated at one
logical node, such that any ...
0
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2answers
30 views
How can I test a DC car blower motor with an external resistor?
How can I test a DC car blower motor with an external resistor? (note that there is an existing question about testing DC motors, but the assumption there is that it has an internal resistor, and it ...
0
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0answers
79 views
Darlington Transistor TIP142 same type but different values
I have a bunch of Darlington NPN Transistors TIP142 that are removed from two separate identical boards. The 1st one have the TO−218 CASE (left side of the image) and the 2nd the TO−247 CASE (right ...
1
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1answer
71 views
Is there a variable forward voltage diode-like device or circuit construction?
I need to make a test PCB for an LED drive circuit that can drive a variety of different single LEDs. The forward voltage (Vf) of the LED could be anywhere from ~2.2V up to ~6.5V. I'd like the test ...
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1answer
67 views
What are the tradition ways to signify/advertise that a potentially dangerous long-running test is in progress? [closed]
I frequently need to run long-term tests which have some potential for damage or harm if e.g. someone disturbs the test apparatus without being aware that it's running a test.
Say for example ...
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2answers
98 views
Is diode with forward voltage ~0.15v faulty?
I tested a diode model SB360 PFS which it showed about 0.15 forward voltage. The reverse voltage is zero.
Looking the diode specification I read that Vf is 0.49v to 0.68v. So my question is if this ...
1
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1answer
83 views
Switching Mode Power Supply Fluctuating Output
I designed a switching mode power supply using LNK-562, I share the circuit schematic below.
Note that NTC, fuse, and the input filter inductor is replaced with shorts in the real circuits.
I am ...
2
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2answers
126 views
How to tell if a capacitor is still good?
I was replacing a 400 V 120 µF capacitor in a power supply (AC 120 V - 19 V DC 4.62 A).
I tested the dc out end while it was still plugged in and got 0.07 V.
As far as I can tell although being ...
1
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0answers
56 views
Circuit testbench nailbed: how to test the pots?
Imagine I make an analog circuit, lets say a guitar pedal circuit (in a PCB of course).
How can I test (automatically if possible) the potentiometers functionality, when testing in a nailbed ...
1
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1answer
133 views
How to test a MOV with no visible damage
As far as i know cumulative degradation occurs in a MOV when multiple surges appears in a circuit, A way to minimize this degradation is having multiple MOVs in parallel.
This kind of damage can be ...
3
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3answers
64 views
Testing a thyristor
I have a very large high voltage device that a friend asked me to take a look at. It has a bunch of BIG thyristor packages (Semikron, SKKT 106/18 E, Dual Thyristor Module, 600A 1800V).
I'm testing ...
2
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0answers
45 views
Testing eurorack input protection
I'm building a eurorack synth module, and I'm about to do the final tests on the design to make sure that the module cannot be destroyed (electronically, using what's available in the rack, so ...
15
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3answers
275 views
Puff of smoke in air. 3 different PCBs. PCB has ghosts?
Yes, that is a haiku. (EDIT: fixed it... it is now actually a Haiku)
No I'm not smiling.
I'm doing some standard testing; seeing what happens when one of the two power rails gets shorted to GND on ...
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1answer
30 views
IEC 61952 Clause 11.1 Electrical Type Test
Where can I find the acceptance criteria for the Electrical Type Tests? Specifically, where is the Dry lightning impulse withstand voltage test and the Wet power-frequency test in the IEC 61952 Ed 2.0 ...
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2answers
127 views
How to test a DMX splitter
This question is related to the DMX splitter I'm building and shown in Prototyping a DMX splitter.
However, for testing a different question is appropriate.
I never really tested a hardware device, ...
2
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2answers
54 views
Help Shielding RF Anechoic Chamber - FM Stations
a collegue and I acquired a surplus small anechoic chamber (8 ft x 8 ft) for making some pre compliance test measurements, and we're running into the issue of FM Stations being only attenuated around ...
0
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1answer
42 views
How does Return/Insertion loss work for wireless devices if there’s no cable?
I understand return loss is the ratio of how much signal is reflected in a transmission line. But for wireless devices there is no cable. So how is this measured?
So is the impedance mismatch for ...
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1answer
221 views
Power supply testing using dummy loads
I am busy thinking of how to test a power supply i am designing and came across an article which discussed using an electronic load to test the supply. I will not have access to an electronic load and ...
0
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1answer
82 views
dBmi Meaning in Testing
I'm having trouble making sense out of this requirement, in terms of how to test for it.
I have a specification stating that for an RF power level measured in dBmi (let's call that power level S ...
0
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1answer
203 views
How to test 3528 smd LED
Using my DMM and the diode selector, the SMDs 3528 in a brand new Led bulb does not light. I used this method to test the classic "round" leds but in this case it does not work. What seems to be wrong ...
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2answers
158 views
MCU overheating
INTRODUCTION
I've designed a custom board featuring a SAME54N20 MCU. This is the third board I assembled but I still haven't got any to work:
I didn't get the first board to connect to my PC. My ...
1
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1answer
69 views
How to perform conducted emissions testing for electric generator?
I am doing pre-compliance EMC testing on an electric generator. The standard I am reading explains how to test devices that get power from mains, but it doesn't explain the testing procedure for a ...
2
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1answer
173 views
PCB Design Verification
I have been designing and prototyping a PCB for the last couple of months. I'm at the point where I'm extensively testing these boards before going into production. I have come across multiple ...
1
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2answers
156 views
ESD/EMI Design for CE, Recommendation seems wrong from test lab
I have designed a product for a customer, that now needs to pass UL/FCC/CE Testing, It passed UL & FCC but failed CE for both 8kv ESD and EMI. The Chinese test lab my client went through sent me ...
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1answer
69 views
What are the maintenance steps for PCBs? [closed]
If I have a multimeter that can measure current, voltage, capacitors, resistors, ..etc., how can I detect the damaged component(s) in a PCB?
I try to visually detect if there are any damaged ...
0
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4answers
106 views
Stress testing a PCB’s current handling capability?
I’ve produced a simple unregulated power supply PCB, consisting of:
AC input terminals
Fuse
4 rectifier diodes
Filter/smoothing capacitors
DC output terminals
Only when the PCBs arrived did I get ...
2
votes
2answers
119 views
How can I build a battery load tester that switches between 0.8 and 2.0 ohms? [closed]
I would like to build a load tester that switches: 2 seconds at 2.0 ohms and 1 second at 0.8 ohms and back to 2.0 ohms to repeat.
I gather that I can have a circuit with two resistors and a switch ...
0
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2answers
50 views
What is the difference between load testing and discharging a LiPo?
I would like to test max discharge rates for 1S (200 mAh) LiPo's. But I can see three ways of doing it:
Using a charger, discharge at highest rate and see how high the battery goes.
Using a resistor (...
0
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1answer
136 views
How to test phone vibrator motor?
I have a phone vibrator motor that I want to check. This is what it looks like:
And here is the schematic from the service manual:
The motor is not connected to the circuit. It is by itself as seen ...
1
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1answer
204 views
Test point map for BBC micro:bit
Does anyone have a map of the test points on the BBC micro:bit?
Specifically, I'd like to connect a scope to the lines from the nRF51's UART to the USB chip, which the published schematic suggests ...
0
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1answer
58 views
Testing a I/V stage using function generator
I created a I/V stage with amplifier for my DAC project. An excerpt of the circuit can be seen in the attached picture in the "Device under test" part.
The DAC has a 3.9mA pp current output, which I ...
0
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1answer
53 views
Over voltage, over current and surge testing
I used a TI reference designto prototype a 120VAC to 5VDC 2A power supply on a PCB and it's been working fine for a couple of months. I want to run some basic tests to see if the PCB is safe under ...
0
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1answer
45 views
Are there disadvantages to this method of testing building wiring after a lightning strike?
A lightning strike can damage wiring in a building. Specifically it can damage the insulation on the conductors, resulting in arcing and fire, either immediately or some time after the strike. I've ...
2
votes
1answer
168 views
How to create measurement points on a PCB for MIPI lane diagnostics?
I am looking for ways to test specifically MIPI DSI lane signal strength (because I am kind of pushing the envelope on the trace length and width), and am happy to add test points to the PCB design. I ...
0
votes
1answer
108 views
Test patterns for testing high speed trans receivers of fpga [closed]
I know that we can generate all possible patterns using LFSR sequences but this will waste memory as we will have to store pattern to do error checking and storing all from 0 to 2^(n-1) will require ...
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5answers
1k views
How to test the maximum secondary current of a step down transformer?
I got a small step down transformer from my local market which has a total of 6 individually isolated winding in it (1 primary of 230V and 5 different secondary wingding with 5 different voltage).
My ...
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6answers
2k views
Techniques for building 'Bed of Nails' testing board
When testing a complete circuit board a 'Bed of Nails' can significantly reduce time and errors.
What are some techniques for making a DIY Bed of Nails?
...
2
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2answers
171 views
FPGA Jtag Hooking to User Logic
After some primer reading on jtag it looks to be a nifty means to test a FPGA logic design in a consistent and sustainable way.
Let's use altera max 10 as an example. I've read this MAX 10 JTAG ...
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0answers
72 views
Why insulation resistance goes linearly
While we test electrical equipment like transformer the insulation readings goes higher linearly over time,And even to infinity which means the instrument could not measure beyond that, 15Tohm is the ...
0
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2answers
112 views
Ethernet mechanical switch for testing [closed]
We have an application which accepts streams over IP and displays it on the LCD Screen.
We want to test the Ethernet plug-in/Plug-out test. Do you know any IC which can simulate someone plugging in ...
2
votes
1answer
96 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 ...
