Questions tagged [testing]

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How to detect that signal suffers from high speed affect corruption using scope?

As far as I am aware, when connecting two PCBs together to transmit high speed signals one should make use of HSMC interface or use 50ohm terminated connectors with coaxial cables. However, lets ...
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1answer
35 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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16 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
39 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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22 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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26 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
44 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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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 ...
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1answer
22 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
39 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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1answer
107 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
56 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 ...
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1answer
153 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
293 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
45 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
70 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
24 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
46 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 ...
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1answer
48 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
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 ...
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1answer
48 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 ...
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1answer
48 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 ...
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1answer
114 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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1answer
33 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 ...
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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 ...
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1answer
29 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 ...
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2answers
498 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 ...
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2answers
30 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 ...
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1answer
95 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 ...
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0answers
31 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? ...
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2answers
39 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 ...
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2answers
83 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 ...
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1answer
116 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 ...
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2answers
45 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 ...
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2answers
251 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 ...
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1answer
137 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 ...
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2answers
68 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 ...
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101 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. ...
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1answer
58 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 ...
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2answers
51 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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67 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 ...
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2answers
31 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 ...
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1answer
25 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 ...
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2answers
50 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 ...
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123 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 ...
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1answer
108 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 ...
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1answer
76 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 ...
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2answers
135 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 ...
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1answer
246 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 ...
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2answers
131 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 ...