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Questions tagged [testing]

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2answers
156 views

ESD/EMI Design for CE, Recommendation seems wrong from test lab

I have designed a product for a customer, that now needs to pass UL/FCC/CE Testing, It passed UL & FCC but failed CE for both 8kv ESD and EMI. The Chinese test lab my client went through sent me ...
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2answers
30 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 ...
0
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2answers
50 views

What is the difference between load testing and discharging a LiPo?

I would like to test max discharge rates for 1S (200 mAh) LiPo's. But I can see three ways of doing it: Using a charger, discharge at highest rate and see how high the battery goes. Using a resistor (...
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2answers
232 views

leakage inductance on three winding transformer

I have a toroidal 3 winding transformer. It's a step up, lets say 1:10 ratio, the secondaries are identical. If I measure the leakage inductance, shorting 1 secondary at a time, I get about the same ...
1
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1answer
30 views

IEC 61952 Clause 11.1 Electrical Type Test

Where can I find the acceptance criteria for the Electrical Type Tests? Specifically, where is the Dry lightning impulse withstand voltage test and the Wet power-frequency test in the IEC 61952 Ed 2.0 ...
1
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1answer
747 views

Calculating AC Input Power

I'm making an AC to DC power supply that connects to mains. There's an AC to DC converter, buck converter and a smoothing LDO that outputs a DC controlled with pots. I'm verifying the supply, and ...
1
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1answer
77 views

Testing a diode's electrical characteristics with temperature control

I would like to test a few diodes electrical characteristics at their device low limit, ambient, and device high limit temperatures. I was thinking of using a Peltier element with a heat sink, but I'...
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1answer
82 views

dBmi Meaning in Testing

I'm having trouble making sense out of this requirement, in terms of how to test for it. I have a specification stating that for an RF power level measured in dBmi (let's call that power level S ...
0
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1answer
138 views

How to test phone vibrator motor?

I have a phone vibrator motor that I want to check. This is what it looks like: And here is the schematic from the service manual: The motor is not connected to the circuit. It is by itself as seen ...
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1answer
118 views

Would it be ok if I try to measure an audio signal using a 15m BNC Cable?

I would need to use a 15 meters BNC Cable (RG58) in order to measure an audio signal that goes directly to a pair of earbuds. This means, the test point would be exactly before the balanced armature ...
0
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1answer
148 views

RF over-the-air signal loss inside an RF chamber

For cabled/conducted testing, path loss between DUT & Test equipment is calculated from cumulative insertion loss from any adapters, co-axial cables, attenuator pads etc. But for over-the-air/...
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1answer
206 views

How do floating voltages affects circuits/systems?

I was at a talk recently regarding robustness testing. It was separated into parts: Uncontrolled and Controlled. Uncontrolled involved applying high floating voltages to various pins and logging the ...
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1answer
114 views

60335-1 27.5 Test - Am I doing this right?

I work at company producing household appliances, and I'm looking into a way to test compliance with part 27.5 of the NEN-EN-IEC 60335-1 standard (which is derived from IEC 60335-1). It states (...
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1answer
29 views

order of detecting the manufacturing faults. stuck at faults after transition faults

I have a couple of question. Can anyone please explain me these statements. Can we use at-speed to detect stuck-at faults? If so how? and is it advisable? why stuck-at fault testing coverage numbers ...
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1answer
436 views

How many stuck at faults are present in this circuit?

I was given a Verilog code of a circuit and was asked to find the number of stuck-at faults. The code was NOT INV1 (Y1, A); NOT INV2 (Y2, A); NOT INV3 (Y3, A); ...
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0answers
27 views

Altium testpoints auto-placement

Is there a way to use Altium to automatically generate testpoints on an already routed board? When there is no usable via, I'd like to place a pad on the net. When reviewing altium API reference ...
2
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0answers
45 views

Testing eurorack input protection

I'm building a eurorack synth module, and I'm about to do the final tests on the design to make sure that the module cannot be destroyed (electronically, using what's available in the rack, so ...
2
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0answers
656 views

How is it possible that lower CAS latency and lower timings on RAM memory to result in lower performance?

I have watched many benchmarks on RAM memories and I was shocked to find out that sometimes lowering the memory timings can result in lower performance in BOTH synthetic benchmarks general use of ...
2
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0answers
182 views

SATA compliance test

Is there anyone familiar with the SATA interface compliance? I'm curious about the testing method. For TX test, there are PHY/TSG/OOB test items. And, there are BIST-L and BIST-TSA mode defined in ...
1
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0answers
65 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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0answers
56 views

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 ...
1
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0answers
1k views

What is the difference between the Hopkinson's test and the Swinburne's test for a DC motor/generator?

If both are used to calculate the efficiency for a DC motor/generator, then why don't we just use the Swinburne's test? For example it has a easier circuit. Is there (maybe) an advantage of one test ...
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0answers
112 views

test 0.5A inductive load through switch circuit

We are a switch component manufacturer and typically run life cycle tests with resistive loads through our switch circuits. Can someone recommend a circuit diagram set up to test an inductive load ...
1
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0answers
1k views

How to test plastic for ESD properties?

I'd like to make myself a cheap soldering / inspection station by taking an acetal plastic slab and mounting a linear rail to it for attaching a USB microscope. However, I want to first ensure that ...
0
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0answers
47 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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0answers
34 views

Stuck at and Transition fault -Capture operation DFT

So I have some questions, I know some valid reasons for these but I'm thinking they might be wrong assumptions. so Can anyone please answer my questions. In general, A stuck-at fault model purely ...
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0answers
79 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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0answers
72 views

Why insulation resistance goes linearly

While we test electrical equipment like transformer the insulation readings goes higher linearly over time,And even to infinity which means the instrument could not measure beyond that, 15Tohm is the ...
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0answers
1k views

Use the BMS from laptop battery for single cell

I have just disassembled a battery pack from a Lenovo laptop (Series: 45N1005 with six cells, Specs: 10.8V, 5.2Ah, 57Wh) and I would like to use the BMS for controlling a single 18650 cell (2.8Ah) ...
0
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0answers
49 views

Why is there need for both functional validation and LBIST during Post-Silicon?

In Post-silicon testing, we have a functional validation testing where C tests are developed to verify the functionality of the SoC, through a JTAG interface connected to the PCB TAP and controlled ...
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0answers
210 views

Switching DC/DC-converter large input and output spike

I am currently testing a DC/DC converter component that it meets datasheet specification. Link to component datasheet: http://www.tracopower.com/products/thn15wi.pdf (THN 15-2411, in: 9-36 V, out: 5 V)...
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0answers
138 views

How can I test my radio module without software to be sure it is not physically broken

I have recently bought a modtronix InAir9 radio module that I use with a Raspberry PI Zero W to play with the LoRa network. I ...
0
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0answers
117 views

voltage drop and fail

I have an instrument (with a robotic arm) that is connected to my pc with usb cable. The usb cable connects to pcb in the robot. A cable form the pcb inside the robot goes to a camera. The data bus is ...
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0answers
64 views

Testing power supply

I'd like to test a 20W DC-DC power supply which has an input voltage of anywhere between 200V and 900V and has multiple outputs of different voltages 80V, 5x15V, 5V and can draw up to 0.8A at its 5V ...
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0answers
665 views

How can I connect two design units in modelsim simulation

Motivation: When I build a hardware component that consist of many sub components, then I need to test the sub components before I connect them all up and make a thorough testbench in VHDL. In some ...