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Questions tagged [testing]

The tag has no usage guidance.

1
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1answer
731 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
1k views

Reading values on continuity test but there is no beep

When checking traces of my PCB I realized that checking continuity between one of the output trace and GND some values appear on multimeter screen but the buzzer does not beep. On the Vcc trace ...
9
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4answers
279 views

How are high-speed circuits tested if test equipment doesnt exist?

How was testing done for Ghz to THz range circuits and devices before fast enough scopes and frequency counters existed?
1
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2answers
330 views

Is it possible to test a MIDI device through its connector with a multimeter?

I have a Fluke 115 multimeter available that I'm hoping has capabilities to register (even with low fidelity) any MIDI signals flowing out of a handful of devices. ...
0
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1answer
220 views

How to safely demonstrate backfeeding AC

I'm looking to setup a basic demo of backfeeding AC and how it effects some AV equipment. My idea was to wire up an extension cord with a three prong if on one end and a simple single gang outlet on ...
2
votes
1answer
134 views

Does DCMI mean dc mA?

I am working with a 60 year old schematic and test procedure. The latter refers to adjusting rheostats to "300 DCMI" or "between 100 and 130 DCMI". There are voltage and ammeters attached to different ...
0
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1answer
117 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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2answers
95 views

How much interference is allowed to pass FCC verification testing?

I have a small electronic device that I'm considering bringing to market. It doesn't have any features like wifi or bluetooth, so one of the prerequisite steps before I can sell it is to ensure it ...
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'...
0
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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) ...
2
votes
2answers
308 views

How can I go about making temporary test connections in pcb while prototyping without soldering?

I recently ordered some PCB bits from Adafruit to assemble a widget. I want to make temporary connections between different PCBs, but am not convinced I want to solder and then desolder and resolder ...
1
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1answer
2k views

Test circuit to confirm RF receiver frequency? (315Mhz vs 433Mhz)

I've bought a 433 Mhz Transmitter/Receiver pair, or so I think. I cannot make them work, and I started to think that maybe the seller sent me a 315Mhz transmitter / 433 receiver pair by mistake (I've ...
2
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0answers
653 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 ...
0
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0answers
48 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 ...
0
votes
1answer
224 views

C3229 transistor testing

I have tried to search through existing questions to find an answer to my question, but so far have had no luck. I apologize (and feel free to flag) if this is a dupe. I am working on repairing an ...
-1
votes
1answer
109 views

Connectors for through-hole unpopulated header on the board [closed]

The PCB have 5x2 through-hole unpopulated header on the board. What sort of test connectors is suitable for attaching to these through-hole header on the board? A common 2.54mm pitch Dual Row (5x2) ...
0
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1answer
410 views

Question about ETL and UL Certifications for battery powered tools

A friend is considering importing a 15 volt Lithium-Ion Battery (2600mAh) operated tool from China to sell to consumers in the USA. The battery charger that comes with the sprayer has a stamp that ...
-4
votes
1answer
61 views

Diagnosing a Broken summing amplifier [closed]

My spec is a DAC, has to take input and output 0-4 volts, 5 bit input. It seemed logical to use a 741 IC set up as a summing amplifier, with gains of 1/2, 1/4, 1/8, 1/16, 1/32. I built it and got to ...
1
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1answer
3k views

How to check if an IC is fried?

I was using my 74173 (d-type register) today and accidentally attached the vcc pin to ground and the ground pin to 5v. I didn't realize this and turned on the power. A couple seconds after turning ...
0
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0answers
204 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)...
-1
votes
2answers
135 views

Simulation pass but Emulation fails

I have learnt that sometimes fpga code may work correctly in simulation, but will fail when emulate. But I couldn't find any example scenario where simulation pass ...
1
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3answers
918 views

Test Circuit to check if DAC is working

I have a DAC that I am trying to design a circuit with. The goal of the circuit is to check whether the DAC is working or not, plain and simple. The DAC in question is the PMI PM-7545 12-bit DAC. A ...
0
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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 ...
2
votes
3answers
261 views

Why does this guide recommend a 500MHz oscilloscope for power supply testing?

EDN have an interesting (for novices like myself!) guide on testing a power supply's design, in which they suggest a 500MHz oscilloscope as one piece of equipment necessary for "proper" testing: ...
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votes
2answers
138 views

What resistor will substitute for an #1129 automotive lamp [closed]

I want to bench test a power supply. The Sam's computer facts troubleshooting manual says to use an #1129 on the +5v rail as a load. I would rather use a resistor. The lamp seems to have specs of ...
2
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3answers
3k views

Why doesn't my multi-meter diode tester work on this LED?

I own a TENMA 72-7720 Multi-meter with LCD/continuity tester: I've used this on other LEDs to test, no problem, using the diode tester setting (approximately 2:00 on the dial by the hold button) I ...
0
votes
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/...
0
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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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3answers
484 views

Testing a PID controller, need equation for PV

I am writing a basic PID controller for the purposes of a completely in-computer simulation, no hardware to run it on. I only the PID. How can I test it on some simulated physical environment? I have ...
0
votes
1answer
205 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 ...
-1
votes
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); ...
0
votes
1answer
420 views

Different methods to perform UIS testing on a Power Mosfet (EAS)

I am currently looking into building a circuit to test for avalanche stress of a power Mosfet. Normally for this specific test, you would want to create a circuit that looks as follows: simulate ...
3
votes
4answers
588 views

Setting up a new electronics lab [closed]

I am setting up a new electronics lab for embedded systems related work. We need four or five workbenches/workstations, a soldering station, enough storage space for all the essential electronics ...
1
vote
1answer
134 views

How to test an EEG?

Apologies out of the gate here as I'm a CS person with not a huge amount of experience in electronics, so this might be a pretty basic question. I've built basic EEGs before, basically electrodes ...
3
votes
2answers
520 views

How to clean dirty test pins in bulk?

Is it possible to clean lots of dirty test pins reliably? We have about 6000 of these test pins and most of them are very dirty. If I cleaned them, what kind of lubricant should I use to relube them? ...
0
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0answers
116 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 ...
0
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1answer
113 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 (...
0
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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 ...
0
votes
1answer
5k views

How to check if IR receiver is dead or not ?

I have an IR Receiver , but I am not sure if it works or not, I want to make sure weather it's burnt or not, How can I test this with Multi meter ? If it can not be tested with multi-meter, Is ...
0
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2answers
128 views

How do computer power supply testers simulate loads without using large resistors?

I notice that commercial computer power supply testers are pretty small devices. However, I would expect such devices to have a 50W resistor at a minimum which is a pretty large item. Do they squeeze ...
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 ...
0
votes
1answer
108 views

Why is the current wrong after resistors in series with simple LED?

Setup source --- 1.5V batteries x2 = 3V LED --- 2V 35mA http://www.futurlec.com/LED/LED5R.shtml Resistors --- CR1W 1W 10ohm +-5% x 4 = 40ohm Description I have your average "Light up a LED" ...
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 ...
1
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1answer
100 views

Quality Procedure for Integrated PCB

I am working on a Quality Assurance procedure document for PCB integrator. I did some research on the quality standards followed by different companies. But what I could not find was a general and ...
4
votes
2answers
212 views

What tests, certifications and labels do I need on my new electronic gadget? [duplicate]

I have designed a VERY basic lighting gadget -- it's basically a flashlight. It turns on and off with a switch and is powered by a rechargeable Lithium Ion Battery via USB cable. It consists of LED's ...
0
votes
1answer
84 views

Is there a method to provide physical stimulus to design inside FPGA like we do in VHDL test bench?

Basically I need to find out if there is a feature that allows one to enter stimulus into an FPGA without using things like signal generators. Altera FPGAs have a feature implemented via Quartus ...
0
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3answers
121 views

How can I tell if my building plumbing provides an adequate ground?

I work in an old building with two-wire wiring, i.e. no separate ground. Is there some minimum-equipment-purchase way to tell if a wire soldered to a building plumbing pipe is an adequate ground? I ...
0
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1answer
103 views

Is there a professional field/classification for people who do test-engineering?

Through my career so far, I have always done work involving developing software to test electronics. This has involved writing diagnostics in embedded C/C++ for ARM controller, and even such high ...
1
vote
1answer
446 views

ISO standards test for vibration resistance of electrical equipment

I would like to test some electrical contacts for oxidation wear resistance in indoor environments and in cars including off road vehicles with a lot of vibration. Are there some ISO standard tests ...
6
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5answers
2k views

Testing points in PCB

I am designing a prototyping platform called evive. It is a learning cum prototyping platform for students and makers. Since many times we requires debugging of our circuits, so I thought to include ...