Questions tagged [testing]

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2
votes
2answers
30 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 ...
0
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1answer
57 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 ...
0
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1answer
41 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 ...
0
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0answers
21 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 ...
0
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1answer
85 views

Boiling Water Probe - High Accuracy (+- 0.1C), High Temperature (100C) [closed]

I am designing a temperature logger to measure the boiling temperature around a big vessel of water as I have noticed it is not consistent. I am looking to create a tree of Temperature probes to ...
0
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0answers
55 views

50 ohm terminated PCB traces

I have designed an IC which I wish to test. I had a company design a PCB form me with all the traces terminated with 50 ohms and connected to headers. The inputs to these headers will be provided ...
7
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4answers
474 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 ...
1
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3answers
133 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 ...
0
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2answers
31 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 ...
0
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1answer
38 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 ...
0
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2answers
81 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. ...
0
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1answer
39 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 ...
0
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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....
1
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2answers
46 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 ...
0
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0answers
25 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 ...
1
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0answers
29 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 ...
0
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2answers
72 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 ...
0
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0answers
10 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 ...
0
votes
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 ...
0
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2answers
97 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 ...
2
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2answers
199 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 ...
0
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1answer
63 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
votes
1answer
169 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 ...
5
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1answer
394 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 ...
0
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1answer
71 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 ...
3
votes
1answer
71 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 ...
1
vote
1answer
33 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 ...
0
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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?
0
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1answer
44 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 ...
0
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1answer
53 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
54 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
votes
1answer
173 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 ...
0
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1answer
38 views

High/ Low level output voltage in gate driver datasheet

Gate driver datasheet mentions about VOLL and VOH with test conditions Iol=100mA I am testing this using this setup by calculating value (ron of pmos is 7.05 ohms) of load to be placed, Is this ...
0
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0answers
54 views

Automatically disconnecting a F connector

I have no electrical engineering experience. I need to test a module, this module has what I believe to be a F-type RF connector to a device. I need to be able to disconnect that RF connector ...
-1
votes
1answer
38 views

Custom Test Fixture for LCR meter

I've designed and built a custom test fixture (based on Keysight's 16047A) to be able to measure multiple pin capacitors. When testing it to compare both fixtures (the custom and the original), I ...
2
votes
2answers
595 views

What is the meaning of “do not populate test points” in a board schematic

I was finding test points in a schematic of an Analog Devices Evaluation board. In one of the schematic pages, there is a clause mentioned "do not populate test points". Does anyone knows what it ...
0
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2answers
31 views

Synthesize ATPG Test vectors with 'X' Values

I am working on synthesizing generated ATPG test vectors and implementing them on an FPGA. However, there's plenty of "don't care" values 'X' in the stimuli and response vectors. I am not sure how ...
0
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1answer
98 views

Embedded Software Reliability Metric is short-term or long-term in time

If I test an embedded software (and the product based on this software) today and it fulfills all the customer requirements successfully at this point in time then I can safely say that this software ...
2
votes
0answers
40 views

Switchgear dielectric testing and impulse polarity

What is difference between negative and positive polarity impulse test? Why Negative only done for internal dielectric strength and positive polarity impulse only for external dielectric strength? ...
1
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2answers
43 views

Adjacent Signal Selectivity: Section 6.1 of ETSI EN 303 372-2 (RED testing). Bad procedure/standard?

I'm doing pre-certification testing to ETSI EN 303 372-2 V1.1.1 (2016-04), specifically the Adjacent Signal Selectivity test in Section 6.1. I am a Systems engineer with lots of experience designing ...
-1
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2answers
91 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
183 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
vote
2answers
56 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
463 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 ...
2
votes
1answer
199 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
75 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
143 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
65 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
63 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 ...

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