Questions tagged [testing]

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4answers
55 views

Testing motor using an identical motor in regen mode

I want to be able to test a motor (permanent magnet motor + gearbox) continuously in steady state mode at different operating points (torque, RPM,) to measure the efficiency of the motor. Instead of a ...
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1answer
61 views

How can I make a test bench for an electric motor?

I'm in college and we are designing a plane for SAE Aero Design, we are trying to come up with a design for a litle test bench for our motor any idea how can we do it, a DIY way, also do you guys have ...
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2answers
48 views

How to predict which machine will act as motor or generator in Hopkinson's test?

Is there any way to predict which machine will act as a motor and which acts as a generator before applying the supply voltage? I cannot find a way to predict what will be the behaviour(motor or ...
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1answer
30 views

How to verify whether an electrical appliance is properly grounded?

I read that an electrical appliance/equipment that is not properly grounded can kill people, especially if it uses mains socket where the current drawn can be high. In fact, even a simple microphone ...
11
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2answers
751 views

Lead Acid AGM battery testing - Why am I testing it this way?

OK, so maybe it's not fair asking YOU why WE test something the way we do. ;) Here's the thing -- Our company uses AGM Lead acid batteries in some products. The testing methods are ancient (but so ...
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1answer
48 views

Evaluation kits explained

I am new to electronics and have been seeing a lot of so-called "evaluation kits" for certain MCUs. For example this Atmel SAM R21 Xplained Pro kit claims to be: "a hardware platform to ...
2
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2answers
83 views

Bed-of-nails testing of ethernet signals

I'm designing a BON testing fixture for a complex board (multiple processors, fpga, memory, etc). One of the items to test is an external ethernet connection (1Gb). In the current design, the ethernet ...
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1answer
70 views

Electronic test clip (hook/grabber): how to open it up?

How do I properly disassemble one of these hooked test clips? The wire broke off: you can see the tiny remainder inside the oval hole. I want to fix / re-solder the wire, but how do I open up the ...
2
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0answers
74 views

Electric grid power transformer winding: If it is milliohms, why does 9V DMM show infinite ohms?

When testing large MVA power transformers, like 66kV to 16kV, the winding resistance in DC ohms is milliohms. It takes a high current supply to do this, then the V is measured across the winding to ...
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2answers
165 views

firmware testing methods

This is my first question here from the community :) So I have inherited some bad embedded code, the whole firmware is a messy spaghetti state-machine that has an infinite number of states! and it is ...
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0answers
21 views

NC (non controllable) fault on primary input

I am using TestMAX (synopsys) to debug problems of coverage in DC (stuck @) simulations. I encountered a NC (non controllable) fault in the primary input, why do I get that? is that a bad fault or ...
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1answer
29 views

How to compare performace of EMG electrodes?

I'm working on building an acquisition system for sEMG signals. The problem I'm facing is how can I reliably measure the performance of different designs? Obviously I can just put the electrodes to my ...
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0answers
56 views

Voltage measurement is different between an oscilloscope and a multimeter

I am trying to measure the voltage between 2 points using an oscilloscope and a multimeter. Question 1: I am getting a difference when I measure the voltage using an oscilloscope and using a ...
-1
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1answer
45 views

how to test transformer ee19 [closed]

for practical learning i have a damaged samsung refrigerator board i guess the problem refer to transformer the model of transformer is EE19-220-12-A it's have 5 pin in one side and 4 in another side ...
4
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2answers
397 views

Voltages decreasing while using the 6 and half multimeter

I am using this this desktop Multimeter - 6 and half multimeter Whenever I measure a voltage or current in the auto mode, the last three digits continues to decrease and keeps on decreasing till the ...
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2answers
91 views

Constant resistance mode in electronic load

I have this DC electronic load. I am setting this electronic load to a constant resistance mode option - say 100 ohms - and turning the output ON. When I measure the resistance across the electronic ...
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2answers
267 views

Does a server put in a 19-inch rack require CE marking?

If I sell to a european customer a simple 1U rack-mount server in a 19-inch rack, do I need to test the conformity of the whole "thing"? The server itself has CE mark, not sure about the 19-...
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0answers
18 views

Automotive Lidar optical testing

What is meant by Lidar optical testing? The optical section of Lidar contains 1)Laser diode 2)Tx/Rx optics 3)Photodiode Whether it meant testing the above sections? If so,What parameters are tested in ...
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2answers
40 views

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 ...
1
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2answers
71 views

What is the best approach to test a new PCBA?

So you went through weeks of schematic design and PCB layout design and Sent files over to fab house. Now, you got the PCB from FAB house. What is the first step you do when you get PCBA? What are ...
0
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1answer
59 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 ...
2
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4answers
130 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
164 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
33 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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0answers
65 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 ...
0
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1answer
69 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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0answers
8 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
77 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 ...
4
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3answers
124 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
36 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 ...
1
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1answer
73 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 ...
4
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3answers
409 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
48 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. ...
4
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5answers
299 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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0answers
25 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
150 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 ...
0
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0answers
23 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
42 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
111 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
46 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
44 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 ...
7
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4answers
531 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
208 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
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 ...
0
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1answer
44 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
87 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
46 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 ...
1
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2answers
60 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 ...
1
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0answers
39 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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