Questions tagged [production-testing]

Production Testing is sometimes called in-line testing. That is the PCB or assembly is completed but is only a sub-assembly. There can be many sub-assemblies to get to the final product. In-line testing is used to make sure sub-assemblies are fully functional per engineering standards, then sent to the stock room to be issued for the next assembly level. This procedure assures but does NOT guarantee that the final product will pass final testing.

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Pads on middle of the tracks on PCB

I'm pretty new to PCB design stuff so please excuse my simple question. What is the purpose of the pads I show in the pictures? It is sometimes used in the middle of the tracks and sometimes at the ...
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Test/programming rig with spring-loaded probes/connectors

I have ESP32-CAM module with two rows of 0.1" male pins. The pins are 0.22" high. Here is a picture: I would like to trim them, so they are too short to mate with the corresponding female ...
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Short circuit testing with protection on power supply

I have a PCB that is equipped with short circuit protection inform of an inline fuse at the main 40V DC input (5x20 glass fuse) and some other components that I am not too familiar with. My aim is to &...
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JTAG ID to differentiate similar devices

Is there a reasonable way to identify different boards with the same parts through JTAG? I have a family of boards that all have the same Zynq CPU but various hardware configurations. I'd like to be ...
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How do you calculate wasted power in a Line Regulation Test?

I was curious about this scenario-- there is a voltage regulator we are testing (LM805A) and we have to perform a few tests: No Load, Line Regulation, Load Regulation, and Dropout voltage test. Beyond ...
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How to prevent GaN HEMT’s transfer curve from overshooting?

recently I was doing some GaN HEMT testing, including drawing transfer curves, generally, the transfer curve should be smooth and without overshooting, however, many of transfer curves I got was weird,...
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How to test for PCB ground being pulled up to 2V when connected to RS485

I am currently trying to find an easy way test to diagnose a problem on some of our PCBs where the ground of the PCB is being pulled up to 2V's. The Board Simple modular RS485 sensor board. The main ...
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Alternatives for a physical relay to disconnect pins of an MCU board from testing jig?

There is a certain system (PCB) which is built around an ARM microcontroller. In order to test the system, I used a DAQ by National Instruments which is able to simulate various conditions (both ...
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Choosing right equipment for the Test Fixture

I'm planning to build a "Test Fixture" which tests PCB via PC that reads data from the I/O module. And since i want this project to be flexible to the PCB change, my preference gone towards ...
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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 ...
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Is scavenging parts from consumer electronics for own commercial products, a good idea?

I have a product that I'm trying to bring to market. For prototype I pulled a camera PCB from an old webcam. It so happens that because my volume of production is low it is actually three times ...
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What are the IEC standards/certifications to look for in a DSO while making measurements pertaining analog parameters like CMRR, SNR, THD etc

I am in the process of measuring CMRR for our mixed signal system that deals with bio-signal acquisition. I am using DSOX2014A keysight entry-level oscilloscope to make measurement to derive CMRR, SNR ...
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6 votes
2 answers
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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 ...
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What's wrong with evaluation boards in production?

I've correctly tested an ESP32-WROVER MicroController and an ADXL355 sensor. Both these devices are on evaluation boards and the fact is that they are very handy: the MCU include an USB female, a ...
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Cooling circuit board for troubleshooting

I'm trying to troubleshoot an LCD TV. It turns off at random intervals I'm guessing as it heats up with use. I want to determine which PCB is failing with heat, and then even isolate the area on the ...
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16 votes
6 answers
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How do professional designs compensate for offset voltage in opamps?

I am new to electronics and have been told in class to always add precision potentiometers to compensate for input offset voltages in opamps for signal conditioning. My concern is that this offset ...
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1 answer
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Position components in KiCad for a test rig

I'm designing a test rig for a product. There's a number of test pads and a power connector on the PCB, which I want to match up with a tester device, i.e. the tester PCB should have pogo pins and the ...
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Op-Amp Comparator Testing

I am having this op-amp Comparator. My circuit is similar to this circuit present in the datasheet of the IC, page 21. I have this circuit now in my board which I want to test. I have never tested an ...
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MATHCAD for electronics circuit analysis usable for production testing

Do anyone have any Idea how to use MATHCAD for electronics circuit analysis. For example, can I find the Worst Case Analysis ( maximum and minimum values at testpoints) of a complex DC circuit for ...
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1 vote
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How to know if test points can introduce EMC problems

After getting some advices from my PCB manufacturer and from people here, I decided to change the PCB design I'm working on so the PCB could be tested using a bed of nails. To do so, I added test ...
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7 votes
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Is PCB testing of all nets after assembly required?

That is my first time asking an assembly house to produce 200 units of a PCB (and not the usual 3 or 5 PCBs). The assembly house came back to me saying that the testability of the board was bad and ...
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Solution to detect bad vias in production process

I face the problem of damaged (cracked) vias in a rigid/flex assembly. It is very difficult to detect those defects before mounting the assembly. Products with cracked vias may fail during lifetime ...
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Is infrared photoemission from silicon used in IC manufacturing diagnostics?

In the video Why all solar panels are secretly LEDs (and all LEDs are secretly solar panels) a silicon photovoltaic cell from a calculator is purposefully damaged and then a 36 V bias is applied. When ...
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How can I replicate a brownout for the purpose of testing

Is there a device or design in which I can place in between the wall outlet and the powered device itself that will cause the powered device to undergo a brownout condition?
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1 answer
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Detecting a short in an enclosed circuit with a PLC

I have an LED circuit that may or may not have a short. It looks somewhat like the image below. The short is labeled 500 ohm in the drawing. The short can actually be anywhere from < 1 ohm to ...
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Testing and safety requirements for selling homemade electricals

I am currently researching and designing electrical audio equipment, example devices: Tube and solid state guitar amplifiers Guitar effects pedals Mixing / filtering units Synthesizers Some of these ...
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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 ...
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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 ...
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Is my simple atmega2560 based product exempt from EMC testing?

I have designed a product that is essentially a USB HID device for a computer game. It consists of several on off switches and 5v servos run by an atmega2560, all sealed and enclosed in a plastic case....
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3 votes
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Test pad's ESD protection

I design a module with onboard test-pads. I put ESD protections to all out-world connections like sockets etc. But I want to ask that; should I put ESD protections to test-pads and ISP socket inputs?...
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1 vote
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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 ...
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1 answer
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Term for pcb test fixture that can access both sides of the board

What is a good term for a pcb test fixture setup having, say, pogo pins that can reach lands on both sides of a device? Could it be dual-side or double-sided?
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How to test a CPU watchdog on board?

The watchdog of an ATMEL ATXMega128 should have been enabled with fuses. It triggers a reset, if the timer was not reset within the configured time span. I want to be sure, that it is enabled and ...
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3 votes
3 answers
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Compliance Testing Strategies

How do people / companies deal with compliance testing (CE, UL, FCC, etc.) what I would call "platform-oriented and modular" products? The idea being that a family of products might exist, where a ...
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3 votes
1 answer
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logic level conversions for opto-isolators in digital input acquisition

This isn't my usual job, I'm not an EE, but I want to give it shot... This question concerns developing an interface board to connect a device (DUT) to a test system in a manufacturing scenario. ...
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5 votes
2 answers
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How to write or generate test cases(or vectors) for automated production testing of embedded electronics?

My question is following: Assuming I have developed some embedded controller(board) which has some tens of digital inputs and outputs. It has embedded firmware, which performs some logical functions. ...
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CE certification

One of the required CE test technical files is "Test Reports". This document has to be provided to the test agency. Does anyone know what data should be included in this document? Here are the ...
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Fault modelling stuck at fault for combinational circuit

A circuit has n inputs and n outputs. It is implemented only using AND, OR and NOT gates. Further, there are no fan-out branches. What is the number of s-a faults that remain after fault collapsing? ...
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2 votes
1 answer
115 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 ...
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8 votes
5 answers
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GPS QA during manufacturing

Testing and integration engineers on electronics.stackexchange How do you quality check if a GPS module and its subsystems are up to the mark during manufacturing? ...
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3 votes
2 answers
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HIPOT testing and Y capacitors

The electric strength test OR dielectric withstand test OR HIPOT test voltage level as specified in EN 60730 standard works out to be 2860VAC for a class II radio product I am developing. The PCB has ...
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I cant seem to figure out FCC or any testing for that matter

this website has a wealth of information and after browsing for quite a while I cant seem to answer my question. I am interested in selling an LED PCB light in the US. It operates on 24v1amp DC ...
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4 votes
1 answer
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How do professional companies test a low power wireless network performance?

I have designed a 5 point low power wireless network using 868 MHz modules and want to test the wireless connection performance indoor. The points are going to be fixed to the wall and placed above ...
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1 answer
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RF Switch or Splitter to test multiple DUT

The task is to test multiple DUT's (sequentially) for Transmitter & Receiver testing in multiple unlicensed frequency bands supported by the DUT. I could connect a single RF Signal Generator to 2 ...
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5 votes
2 answers
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Temporary PCB connections for testing

I want to be able to perform tests on assembled PCBs with a custom tool. the test would take seconds, and would be done manually by connecting a cable between the tool and PCB. My question is what ...
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Testing VOH, VOL, VIH, VIL

How would someone test Vih, Vil of an input pin (Or VoH, VoL of output pin) of a SoC. With an inverter, you could easily see the results but with a microcontroller/SoC, it seems difficult without the ...
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6 votes
3 answers
1k views

PCB in circuit tester design

Imagine you want to produce 1k pcs of hardware(mixed signal) per month and you would like to have tester in order to load firmware, calibrate sensors etc. How do you approach that problem? I see many ...
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2 votes
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RF generator TX antenna with low impedance can damage generator?

I got an RF generator R&S HAMEG HM8135 that I use in a testsystem to generate FM and AM stimuli in order to check if FM antenna and AM antenna is correctly mounted on the testobject in a ...
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6 votes
3 answers
4k views

EMC testing vs. EMI testing

What is the difference between EMC testing (Electromagnetic compatibility) and EMI testing (Electromagnetic interference)
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1 vote
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ethernet socket interface throught nail bed

I need to make a test nail bed for a board that has an Ethernet interface: in the bottom of the board there is access to the socket ethernet pins i could place test nails under the ethernet socket to ...
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