Questions tagged [testing]

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51 views

Can anyone identify this component from a radio? [closed]

I'm troubleshooting a dead radio and I'd like to test this component but I can't figure out what it is (the black one in the center of the photo). It has 3 pins, no markings and might be part of the ...
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1answer
54 views

Way to connect test points on circuit board when both sides of board must be accessible?

I have a commercially made circuit board with multiple 7-segment displays (HSP-H103) soldered into it. I need to test the displays to make sure all of the segments work for each one. The problem is ...
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4answers
128 views

What features should/must be present inside a prototype FPGA board to aid in debug?

When making any prototype PCB it is always a great idea to have features within it that can be used to aid in debug of the design. A few examples are: Use the largest FPGA available that has ...
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1answer
53 views

Shorting the Output of a voltage regulator

I am using this Buck Converter Input Voltage Range - 8-16V Output Voltage - 5V Load Current - 550mA This 5V is the power supply (Vcc) to the mentioned IC loads : Microcontroller , LED Driver , 2x CAN ...
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1answer
30 views

Routine Tests on Motor

I was going through the standards related to motor testing that are IS 12615, IS 15999-1, IS 15999-2-1 while reviewing a motor with requirements of 3phase induction motor, 1500rpm, 120hp, 415V and ...
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23 views

Testing a 24v dc fan

I have bought a new 24v dc fan for my 3D printer’s power supply. It’s meant to be quieter. To install it I had to crimp a JST-XH 2 pin 2.54 pitch connector onto the wires and open up the supply. I ...
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1answer
61 views

Single ended scope probes on equipment under test which ARE on an isolation transformer

I am using my company's new oscilloscope and I don't want to mess it up. I have searched all of the topics, but nothing tells me exactly what I want to know so I thought I would ask in case somebody ...
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2answers
61 views

Powering sewing machine card [closed]

Hi, I received an electronic card to repair. The user says that it doesn't work and didn't say anything more, such as why it was broken or which part is not working. So I want to plug in an energy ...
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6 views

Why ATPG DRC check is done if DRC check is already done at Scan insertion stage?

Why ATPG DRC check is done if DRC check is already done at Scan insertion stage?What is the difference between both the DRC checks?
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1answer
74 views

Is there any passive component holder similar to a fuse holder?

Below is a fuse holder from Keystone. As far as I know, it allows the user to replace the fuse inside easily when it is needed. My question is, is there similar holder for regular SMD passive ...
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3answers
122 views

Is it reasonable to qualify a component by testing only?

Just got assigned (sole) responsibility of a major product group in my company. I have discovered that we regularly use components outside of their specifications, and justify that by testing the ...
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1answer
35 views

How are oscillator circuits characterized in a lab after their manufacture?

I know that ADCs are characterized by their INL, DNL ect parameters, but how about the oscillator circuits? If we need to test/characterize an oscillator circuit block of a circuit on a test board ...
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1answer
55 views

How to check the power output of home amplifier speaker terminals?

I recently bought a Sony STR-DH800 from eBay and to cut a long story short I'm getting different volume levels using the same speakers across the various speaker terminals. I have a multimeter and I ...
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3answers
400 views

How to test desert (Dubai-like) conditions when you are in a temperate climate

I would like to stress test an electronics device in desert (think it like Dubai) conditions, such as 40-45 degrees Celsius = 100+ degrees Fahrenheit with direct sunlight and zero humidity. I live in ...
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1answer
46 views

PWM signal not visible upon increasing the scope time base

I am capturing 2 different PWM signals. The frequency of first PWM signal is lower when compared to the second one. Please check the waveforms. All the waveforms are taken of the same two signals. ...
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5answers
173 views

Learning from checking a 9-volt battery the wrong way with a multitester

I'm doing some extra-curricular learning about electronics before I know much. In the spirit of Platt's book, "Make: Electronics", I am "breaking and burning" things to help learn the fun way. I'm a ...
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24 views

Lithium Ion Battery - Testing & Self Discharge

It is suggested and commonly understood that if Li-ion batteries drop below a certain threshold that we consider the cell(s) unstable and untrustworthy with a loss in cell capacity and that increased ...
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2answers
140 views

Is there a component that doesn't let anything below a certain voltage through?

I was wondering if there was a component that would only let current flow if it was above a predetermined voltage. I am building a subsystem for my project, which is an open door sensor that uses a ...
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20 views

Bad Diode Testing not working?

Well I am trying make a diode test with my digital multimeter. When I measure with the multimeter probe (video link) , 0.401 volts seen in one direction, If I change the location of the probes, it's ...
2
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2answers
33 views

Noisy output on voltage reference and correct probing

I'm building a circuit that has a 2.5V Voltage reference for use on the internal ADC of a STM32F7 in 12 bit mode. As each bit corresponds to 610uV I'd like to have as little noise in the signal as ...
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1answer
73 views

Why does the value increase constantly and slowly in diode mode?

I am using Fluke multimeter and trying fix electronic circuit. In diode mode fluke docs, telling briefly explained how to test the durability and accuracy of diodes. The test usually runs when I touch ...
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1answer
44 views

Why no conductivity with this wire?

These are two ends of the same cable: The cable comes from an old headphone set and I want to re-purpose it. What are those copper looking wire strands? I could not get connectivity between them and ...
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0answers
27 views

Test-jig for the Display system

We have a system in which is an HMI with a display. To test a system, I have to connect LCD to the board, and 6 more cables to the board. As LCD is having an FPC cable, it will take more time compared ...
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4answers
514 views

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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3answers
159 views

Developing a Hardware Test Plan for a Microcontroller - Past Experience

I am using this Microcontroller using 3.3V for power. Using GPIO pins to drive some LEDs and send some ports for sending UART, LIN signals. I'm using a 16MHz crystal. Can someone tell me what the ...
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2answers
33 views

Is there a way to check if one or some of multiple lines is broken?

There is a product whose soldering process is often unreliable, and it has more than 50 I/O interfaces. Some of them should be shorted, and some are independent. I used to test it by a multimeter ...
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1answer
40 views

FCC / CE requirements for adapter pcb?

A product consisting (electronically) just of a PCB with a male USB-C one one side, 5mm of traces and a female USB-C on the other end. No other components at all. To be used as consumer device. How ...
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2answers
83 views

Tests to verify complete functionality of a PCB

What tests can be carried out on a power supply PCB to verify its complete functionality? For example:- I have designed a custom board using the JCM3012S3V. It takes 12V input and produces 3.3V. ...
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1answer
45 views

Frequency Sweep

I have heard the term "Frequency sweep" in testing context. I want to understand, when we say frequency sweep, we give a start frequency and a stop frequency. Assume a function generator with a ...
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0answers
21 views

EV charger testing BS7671 CPC-earth test

As part of the standards for BS 7671 it states: A device which disconnects the charging point from the live conductors of the supply and from protective earth in accordance with Regulation 543.3.3....
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2answers
48 views

Measuring output voltage (Single ended probe vs differential ended probe)

I have a SMPS buck 3.3V output. I am trying to measure the output voltage at the output capcacitor using Oscilloscope. I am using a single ended probe with spring ground tip to measure the output ...
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0answers
27 views

How to correctly test an ebike battery for wear / capacity?

I am looking at purchasing a used lithium ebike battery. Are there any reasonably quick tests that can be performed prior to exchanging money to test the overall wear of the battery? These are the ...
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0answers
30 views

How can I test wether my OCXO VCO is working fine?

I recently bought a PTOC32227 OCXO (datasheet) from eBay (secondhand). It is supposed to output a square wave at 10MHz. However, it is a part of a bigger circuit that is not working properly and it ...
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2answers
111 views

How to safely test a Lithium Battery Management System board

I'd like to design a Battery Managements System board (based on TI bq40z50-R2) for my own small (2-4s) lithium battery pack, but I am still unsure how can I test it safely. I am worried that an error ...
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0answers
13 views

What's the best dielectric breakdown test sequence for a DPST switch?

Please could you help me to check my understanding of dielectric breakdown testing? I’m only a humble mechanical engineer so I’m a bit outside my comfort zone. A product requires dielectric ...
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1answer
24 views

Efficiency Test of Permanent Magnet (PM) Motor With Variac&Fixed Resistance

We have a 3-phase permanent magnet motor and want to test its efficiency in generator mode. We can give a mechanical input power with an external motor (torque meter and tachometer installed) and we ...
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2answers
206 views

Low impedance voltage testing (LoZ)

Is there any issues with using low impedance mode on a multimeter for day to day testing on mains voltage 240Vac or if this mode should only be used when testing for phantom voltage? Is there any risk ...
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2answers
253 views

How to solder these tiny pogo pins?

I bought pogo pins to use for firmware uploading. So I have to make a Jig for my PCB, but this is the first time I use pogo pins. I have no ideas where I have to solder, I mean I want to know if ...
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1answer
64 views

What is the most straight-forward way to simulate this circuit?

I would like to verify the function of this circuit, as well as determine the power usage and heat generated by each component. (I need the latter for doing a thermal analysis) The circuit has been ...
3
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1answer
178 views

The TI quad-XOR gate acts as it is short circuit

I have a TEXAS INSTRUMENTS CD4030BE Quad Exclusive-OR gate. I have an electronic board of simulate this circuit – Schematic created using CircuitLab using this and this refrence. According to ...
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1answer
483 views

How to check if my quadrature encoder is broken or not?

I have purchased some cheap quadrature incremental encoders (YUMO E6A2-CW3C) for which I have found "a" data-sheet here. Now based on my limited knowledge the quadrature incremental encoders are ...
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1answer
98 views

Are pads from the EAGLE “testpad”-library printed?

just a quick question. Are EAGLE "testpad"-library printed or seperatly bought and mounted? E.g. "testpad / PTR1" TEST PIN Footprint: B1,27 (Version 1) TEST PAD 3D Package: B1,27 (Version 2) TEST ...
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1answer
73 views

Transistor pad layout for efficient use of prober

As we are a materials company the expertise is not in EE, so I am asking a very simple question. I tried to search online for this, but could not find an answer. We are making transistors with our ...
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1answer
43 views

Recommendation ITU-R BT.1729 test image for 5:4 display

For radiated emissions testing according to EN 55032 CISPR 32 with displays of category 4, there is a Recommendation ITU-R BT.1729 which specifies a reference test pattern. The pattern is designed for ...
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1answer
47 views

Automated testing - disabling a GPS antenna [closed]

I am doing automated testing on a module. This module has a SMA connection to a GPS antenna. I need to automatically (programmatically) disable the connection to this antenna somehow. What would be ...
0
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1answer
49 views

Standard time for LED light testing [closed]

What is the exact timing for testing(continuity, electrical parameter, optical parameter, thermal parameter) of LED lamp after manufacturing?
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1answer
45 views

What can I do on the bench to determine if a power supply does or does not add back a PFC (Power Factor Correction)?

I'm given a AC to DC power supply with only the inputs and output specified. It was probably made after 2000, and the ENERGY STAR program mandate to add PFC correction to power supplies may or may ...
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1answer
64 views

Measurement of Quiescent Current and Operating Current in Gate driver

In datasheet they have provided two parameters named Quiescent Current and Operating current in which I am measuring quiescent current i.e, ground current flowing from the device VDD to GND , when ...
0
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1answer
55 views

How could I measure RF transmission power from SMA connector without having a RF wattmeter equipment?

I need to measure the RF power of a radio transreceiver, and since I haven't specific RF wattmeter equipment, I'm wondering how I could do this using a classic multimeter. I would avoid to ...
4
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1answer
241 views

Self Certifying for FCC testing

I have been tasked by my current employer to look into the costs of self certifying. With past companies I have worked for, all of the tests were at a 3rd party lab. The closest thing I have seen to ...

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