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Does IEEE have standards for performing Open-circuit test and short-circuit test for transformer and synchronous machine? If YES, pls advise the standard reference code. Thanks.
I would like to know, why is there much lesser noise in the voltage waveform of open-circuit test compared to short circuit test? also Why in a practical transformer short circuit test primary voltage is not zero? Hope someone could let me know. Thanks
the PMOS will only handle 75A if it has a certain size heatsink and/or defined cooling method (see datasheet). for short-circuit you should use hardware to detect this through desaturation detection and hardware shut down. this method can achieve shutdown in 5uS which is essential for large power converters. try putting a big fan blowing on it
The current limiting action will be around 2.5..3A. When current limiting takes place, the mosfet carries full voltage, so the dissipation is in the several 100 W range. You are very likely exceeding the Safe Operation Area and the mosfet dies because of thermal runaway due to the positive temperature coefficient in Id versus Vgs when in n
You will do contact damage on opening, not closing, the switch. A snubber network may limit the voltage rise on opening, to below arc voltage and minimize that. Personally I'd go with the power MOSFET because you may later take an interest in the dynamics of short circuit protection (esp. looking at what the output response to a momentary (...)
In circuit testing is only for short circuit test (in some cases even not possible). For proper testing and surety has to be removed from PCB.
yes.. i'm referring for open/short test of machines.
Hi everybody... Recently I could participate in the Open circuit and short circuit test done to a Siemens Generator Type of Generator => SGEN6-1000A S=201MVA P=180.9MW Iarmature=7253A Ugenerator=16kv+/-5% n=3600rpm f=60Hz fdp=0.9 Ifield=962A Ufield=293A There's a file with all the data taken from TXP control and (...)
Hello, I have a problem with my short circuit protection circuit. You can see my short circuit protection in the attachment. The main circuit is used to drive some amount of digital 7-segment displays(The one in the attachment is for one segment of the digitals, all the segments are (...)
Hi guys, I was just wondering how to measure short circuit current (or max current subject can supply) safely?? For example, I have a transformer with ratings 48V, 3A... I wanna verify whether it really gives 3 Amps or not...How do i do that???:roll:
Hi Vonn, how detailed do you need your transformer parameters?? If you only need primary to secondary turn ratio, this is quite easy. You only need to supply any ac voltage on the primary (be careful not to saturate the core) and measure the secondary voltage. If you need the elements of the equivalent circuit diagram you have to measure m
You can test the IGBT by multimeter at the Diode test position. Emetor Collektor must be open circuit at the two direction (If you see reverse diod this is not problem). Gate Emetor must be open circuit. If you see any short circuit at the any two pin IGBT is mort. But this is (...)
Depends on exact type of keyboard, but usually: 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 x1- x2 - x3 -x4 - y1 -y2 - y3 -y4 -GND x - horizontal y - vertical Use multimetar, put it on diode test or short circuit test and play a litlle! regards meax98
ICT is a complex testing machine involving electronic+pneumatic component. THe default value is stored by user for each PCB board to be tested. ICT will compare this vlaue the reading that it gets when ICT is functioning. THe main idea is using "Bed of NAils" approach. the pin of nails will touch the PCB on surtance point(that why every PCB
Refer to "Electronic Instruments and Measurements" by L.D. Jones, Murray loop testand Varley loop test are both used to locate faults (ground fault, short-circuit, etc) in cables. Questions: 1) Pls share if you have more information about both tests. 2) What are the advantages of Murray loop (...)
Guys please help, DO you know how to check whether mosfet is good or not in circuit? Understand if it always short drain source then we can check it in circuit but sometime there is a case where mosfet switching is not function properly. Usually I will lift up it lead or remove it and check whether its swithing is ok or not. Do you (...)
There are many tests. open circuit test , short circuit test , PLL & ADC characterization tests and functional test etc....
first connect dmm red lead to drain and black on the source.(meter should be on diode test mode) in first case drain to source will be open. then connect meter red probe to gate and black to source and again connect the red probe to drain and black with it will show the short circuit.after this short the gate (...)
Both diodes are on (short circuit), current in R = 1mA.
Hi zhonghan According to this figure: -2kV (negative zap) is applied at pin 1 with pin 2 at ground. According to the figure (green reference line) there was a forward diode from pin 1 to pin 2 and some element for the reverse stress case (power clamp, local clamp or diode up + power clamp). So this could be (example) pin 1 is a ground an
Hello All medical devices for EU market should pass Single Point Failure test. It is quite obvious with 2 pin devices, as they should be considered open circuit or short circuit. What about components with more than 2 pins? Sepic transformers? ICs? Displays? Second question is: Could such test be (...)
Can you carry out test on the transformer? If you're allowed to do so, may be you can find the parameters via open- and short-circuit tests.
It can be tested the same way as a Zener diode, that is using adjustable voltage/current power supply .. Set the short-circuit current to, say 5mA, connect the trnaszorb and slowly increase voltage - at roughly 10-11V you should notice rapid increase in the current flow - measure voltage at which current starts to flow through the transzorb (...)
The two power transformer 69/22.9kV and 230/69kV are both rated 60/80/100MVA designed for 60 Hz operation. However it will be tested on test facility were the available supply is only 50 Hz. During short circuit test at the LV side the 60/80/100MVA rating will be tested for the lowest (...)
I mean that it limits the impedance. Any impedance in parallel with one ohm will be less than one ohm. This occurs at higher frequencies where the series capacitor looks like a short circuit.
Modern telecomm system use freq less than 5GHz, in such low freq, the 1/4 lamda is a little long, so normally use inductor to bias current. For DC, the inductor has little resistance, say 0.5 ohm; but for RF, the resistance is greatly more than 50R, say 300R, so the RF leakage through the inductor is very little. Because after the inductor, ther
Hi I am looking to do some simple tests on machines using an appropriate software. Some examples are: 1. Transformer open circuit and short circuit test to find the equivalent circuits and efficiency. 2. DC generator characteristics 3. Simple tests on synchronous (...)
hi, i done programmer ckt(made it on GP board) that ckt one end of resistance and zener diode's negative terminal are shorted and given to controller and positive terminal of zener is grounded, other end of resistance going to db9's pin4 .... while testing the resistance with multimeter....i got resistance is shorted
Hey Gentleman! Hi I think your mean is that you want to test your IGBT ( is intact or not?). if yes, your answer is simple! if you give +15 volts between gate to emitter of your IGBT , Its collector , emitter junction , will become short circuit( approximately). if you can see this behavior , your IGBT is intact. Regards Goldsmith
According to LTC1446 datasheet, the current capability of integrated output buffer opamps is typically 55 mA when shorted to GND. I think u can assume that drawing 2mA from this DAC won;t do any harm to it.
You can make your life easier by considering likely and unlikely failure mechanisms. Unless someone supplies you with faked components (no idea, if it could be problem in your country), you rarely will face a thyristor that doesn't trigger. Devices mostly fail short circuit, caused by fatal overcurrent or overvoltage.
hello, anyone . recently ,i am designing a igbt short circuit protection. but i meet with a problem. the driver i use is vla500-01 which is from isahaya (japan), and the module i use is cm1400du-24nf which is from mitsubishi. and my simplified test setup see attachment. first, i charge the capacitors to 100v, and then open the switch, that (...)
Transformers work in a given frequency range. The bike generator is an alternator: the frequency should change with speed becoming low for low speed. If the reactive part of the impedence of the primary is too low the whole voltage is applied to the winding resistance that could be damaged. Also the generator is driven to work close to a short circ
hello. i recently in the process of the igbt short protection. but i meet with a little problem. my igbt driver CANNT protect the igbt when the igbt is in the short circuit condition. i use the VLA500-01 driver which is from isahaya, and the igbt module is CM1400DU-24NF. the attachment is one of a picture from the ocilloscope. the yellow (...)
You cant get 2V from 12V battery if battery is good. Look for short circuit, check 7805 regulator without rest of circuit.
can you do short circuiting the end side of cable ?
hi.I want to have circuit which test diode which is short circuit or open circuit or have no problem and I want make this circuit by AVR. please help me
Hello dineshdeshmuk, Look for the brushes, if they have real contact. Look for the commutator, that there are no scorch marks round around. If yes, look for the contact pressure of the brushes or change them directly. If there are only a few scorch marks, the winding of the armature has a short circuit. It must be change or make new windi
Hi , I have a little doubt , I want to test my circuit which is powered with 12V, 200Ah battery(VRLA) and check the outputs on oscilloscope. While testing can I connect battery -ve to the oscilloscope ground? Is there any safety risk, as oscilloscope internally connected to safety earth(PE)? If I connect to battery's negative terminal, (...)
My PCB 3V rail is bad. Discovered that its caused by the 3 V regulator. The 3V rail provides power to the FPGA. I am looking to replace the regulator by ordering new parts through but in the mean time while I wait for those regulators to arrive is there any objection to providing 3 Volts to my FPGA from a power supply? For instance I was thinkin
modify the circuit that gives AC audio signal and repeat the exercise. May be a broken small toy piono will sufiicient the requirement. Break the speaker or audio crystal unit connection. Attach leads to both ends of this broken connection to test open or short. Ensure that the toy key is in pressed mode in default. if you connect the leads (...)
Hello, I have some problems for chip capacitors. Currently we are using some "quality" chip capacitors, such as Kemet and Phycomp (Ex philips). But I find them easily short circuit after wave soldering. Especially if the pcb is placed at high humidity environment. The problem seems to be caused by not enough acid cleaning from the capacitors.
This would make conversion more efficint. Many people make test about the LO and IF terminal such as short/open/match...,but the short is most efficient.
The difficulty concerning tristates on devices is that of contention. If there is a shared bus, it is necessary that all components connected to it do not suffer from contention. If there is any contention on the bus, then the tristates will effectively short circuit the supply rail to ground, causing significant current flow, electromigration and
You can get the parameters of the transformer, u have to do some meassurements for this, like in short circuit and open curcuit test, u meassure voltaje, current and power. it's not that easy to get, there is a lot of theory there, u have to get the whole equivalent circuit of the tranformer to find out the inductance of (...)
Since all you need is a few mA, all you need is a transformer operated from the mains and some HV diode rectifiers and a capacitor. You main concern should be safety. Put a series current limiting resistor inside the box you put the circuitry in so that the short circuit current on the wires outside the box is below a few mA.
It's not always shorting (voltage) or opening (current) the input sources. If the input source impedance is finite, like eg 50 ohms, you should connect this impedance to the input node. Then again you can define the output impedance with the calculation stated before.
The meter you use at school may have an internal oscillator. You can test it with a 50 ohm resistor and then an open and then a short circuit. You should get 1 for the first and infinity for the second two terminations.
You can experimentally determine the emitter, base, and collector connections to the external terminals with a power supply which has a current limiter either adjustable or with a series resistor. Set the power supply to 2 V and the short circuit current to 1 mA. The base will be the terminal that passes current to the other two terminals (co
Structure test is a testing process detects all faults of the structure of chip. For examples, stuck-at fault, coupling faults, short-circuits, crostalk, etc. A circuit passed a structure test does not mean it will work functionally (as expected). Functional test is a (...)