Questions tagged [testing]
The testing tag has no usage guidance.
-1
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2answers
69 views
In Circuit Tester design
I wanted to create an ICT to check for shorts and validate some of the voltage levels on a PCB that I created, using a jig. I have placed probe points on the desired nets and will be using pogo pins ...
2
votes
1answer
47 views
How to connect to tiny pogo pins in test fixture?
I'd need to build a test fixture with very small pogo pins (1.27 mm spacing between the closest pins). I've seen fixtures before that use very long, very thin pogo pins almost exactly like this one ...
1
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2answers
37 views
Should series connected battery cells have similar internal resistance and to what degree?
I have some Toshiba SCiB cells that I wish to string in 4s configuration. These are Lithium Titanate (LTO) cells. They have a 20Ah capacity and operate safely between 1.5 V and 2.7 V. The cells were ...
2
votes
2answers
123 views
Reserve Capacity Testing On Lead-Acid Car Battery
All car batteries have Reserve Capacity ratings instead of Ah ratings for deep-cycle batteries. Using this data to test the health of the car battery a good way to estimate life left?
Let say I have ...
1
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1answer
73 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 ...
0
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2answers
64 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
54 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
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1answer
48 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
vote
2answers
42 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
votes
1answer
51 views
Altium testpoints auto-placement
Is there a way to use Altium to automatically generate test points 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
0answers
66 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
votes
1answer
31 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
83 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
30 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
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2answers
31 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
89 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
vote
1answer
79 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
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1answer
68 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 ...
0
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2answers
111 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
113 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
votes
2answers
127 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
60 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
176 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
96 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
47 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
280 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
33 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
143 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
55 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
47 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
343 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
100 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
282 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
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2answers
187 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
71 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
213 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
2answers
171 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 ...
1
vote
1answer
71 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
115 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
143 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
52 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
156 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
vote
1answer
233 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
votes
1answer
71 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
61 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
votes
1answer
49 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
196 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
115 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 ...
1
vote
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 ...
