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Questions tagged [testing]

The tag has no usage guidance.

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 ...
0
votes
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 ...
0
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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. ...
0
votes
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 ...
0
votes
1answer
108 views

Connectors for through-hole unpopulated header on the board [closed]

The PCB have 5x2 through-hole unpopulated header on the board. What sort of test connectors is suitable for attaching to these through-hole header on the board? A common 2.54mm pitch Dual Row (5x2) ...
3
votes
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
vote
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 ...
1
vote
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 ...
0
votes
1answer
113 views

60335-1 27.5 Test - Am I doing this right?

I work at company producing household appliances, and I'm looking into a way to test compliance with part 27.5 of the NEN-EN-IEC 60335-1 standard (which is derived from IEC 60335-1). It states (...
-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 ...
0
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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 ...
0
votes
1answer
116 views

Would it be ok if I try to measure an audio signal using a 15m BNC Cable?

I would need to use a 15 meters BNC Cable (RG58) in order to measure an audio signal that goes directly to a pair of earbuds. This means, the test point would be exactly before the balanced armature ...
1
vote
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 ...
0
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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
votes
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
votes
1answer
135 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 ...
0
votes
1answer
148 views

RF over-the-air signal loss inside an RF chamber

For cabled/conducted testing, path loss between DUT & Test equipment is calculated from cumulative insertion loss from any adapters, co-axial cables, attenuator pads etc. But for over-the-air/...
1
vote
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 ...
0
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1answer
205 views

How do floating voltages affects circuits/systems?

I was at a talk recently regarding robustness testing. It was separated into parts: Uncontrolled and Controlled. Uncontrolled involved applying high floating voltages to various pins and logging the ...
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 ...
0
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2answers
232 views

leakage inductance on three winding transformer

I have a toroidal 3 winding transformer. It's a step up, lets say 1:10 ratio, the secondaries are identical. If I measure the leakage inductance, shorting 1 secondary at a time, I get about the same ...
1
vote
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 ...
4
votes
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 ...
1
vote
1answer
731 views

Calculating AC Input Power

I'm making an AC to DC power supply that connects to mains. There's an AC to DC converter, buck converter and a smoothing LDO that outputs a DC controlled with pots. I'm verifying the supply, and ...
0
votes
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
vote
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 ...
1
vote
1answer
202 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 ...
1
vote
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
vote
1answer
131 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
votes
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
votes
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
votes
3answers
274 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 ...
1
vote
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 ...
1
vote
2answers
126 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
votes
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
votes
1answer
41 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 ...
0
votes
1answer
214 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 ...
1
vote
1answer
2k views

Testing Capacitors - Differing Results Each Time One Is Tested?

I have a bust LCD TV - I've already ordered a replacement but am interested in using the broken TV to learn a little more about how these are put together and if I'm lucky fix it to have as a spare. ...
8
votes
2answers
8k views

How can I determine if a microcontroller is damaged?

I have a few microcontrollers sitting in my "junk parts" bin. I think some of them arrived there when, after programming them, they exhibited strange behavior. I've since learned a lot, for example, ...
0
votes
1answer
80 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
votes
1answer
201 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 ...
1
vote
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
vote
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
votes
1answer
170 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
vote
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
votes
4answers
105 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
votes
2answers
49 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
votes
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
votes
1answer
410 views

Question about ETL and UL Certifications for battery powered tools

A friend is considering importing a 15 volt Lithium-Ion Battery (2600mAh) operated tool from China to sell to consumers in the USA. The battery charger that comes with the sprayer has a stamp that ...