195 Threads found on edaboard.com: Short Circuit Test
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.
Electronic Elementary Questions :: 23.02.2006 23:16 :: powersys :: Replies: 1 :: Views: 3043
I would like to know, why is there much lesser noise in the voltage waveform of open-circuit test compared to short circuit test?
Why in a practical transformer short circuit test primary voltage is not zero?
Hope someone could let me know.
Analog Circuit Design :: 24.04.2012 09:15 :: intensified :: Replies: 7 :: Views: 1194
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
Power Electronics :: 26.06.2012 22:45 :: Mr.Cool :: Replies: 3 :: Views: 589
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
Power Electronics :: 05.10.2012 16:15 :: WimRFP :: Replies: 2 :: Views: 379
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 (...)
Power Electronics :: 03.01.2013 11:39 :: dick_freebird :: Replies: 6 :: Views: 186
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.
Service Manuals, Requests, Repair Tips :: 09.10.2006 22:11 :: Raza :: Replies: 3 :: Views: 2680
yes.. i'm referring for open/short test of machines.
Electronic Elementary Questions :: 08.03.2007 11:42 :: marsvoltaire :: Replies: 6 :: Views: 6120
Recently I could participate in the Open circuit and short circuit test done to a Siemens Generator
Type of Generator => SGEN6-1000A
There's a file with all the data taken from TXP control and (...)
Electronic Elementary Questions :: 08.06.2007 10:40 :: madeza :: Replies: 0 :: Views: 1117
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 (...)
Microcontrollers :: 26.07.2011 16:42 :: losturcos :: Replies: 7 :: Views: 496
short circuit current and maximum output current are obviously different numbers. Maximum output current usually refers to thermal ratings and can't be determined in a short term measurement. short cicruit current as well as voltage drop can be calculated from Xs and Rs impedance parameters, you don't necessarily need to (...)
Electronic Elementary Questions :: 20.09.2011 06:23 :: FvM :: Replies: 5 :: Views: 416
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
Professional Hardware and Electronics Design :: 05.10.2003 14:59 :: Aoxomox :: Replies: 2 :: Views: 2322
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 (...)
Hobby Circuits and Small Projects Problems :: 28.01.2004 06:23 :: bunalmis :: Replies: 2 :: Views: 4702
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!
Microcontrollers :: 02.08.2004 04:24 :: meax98 :: Replies: 1 :: Views: 1627
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
Electronic Elementary Questions :: 25.10.2005 21:31 :: Syukri :: Replies: 1 :: Views: 1145
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.
1) Pls share if you have more information about both tests.
2) What are the advantages of Murray loop (...)
Electronic Elementary Questions :: 12.02.2007 04:03 :: powersys :: Replies: 1 :: Views: 4556
If a FET fails it most commonly give a short circuit between Source and Drain. (in power applications) You can messure the resistance between these pins. If it is lower than a MEG it is probably dead.
PS: don't forget to power down your device.. :D
Electronic Elementary Questions :: 01.08.2007 03:47 :: Jos Brink :: Replies: 5 :: Views: 13068
There are many tests. open circuit test , short circuit test , PLL & ADC characterization tests and functional test etc....
ASIC Design Methodologies and Tools (Digital) :: 19.07.2007 15:05 :: kumar_eee :: Replies: 7 :: Views: 677
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 source.now it will show the short circuit.after this short the gate (...)
Hobby Circuits and Small Projects Problems :: 19.05.2008 00:01 :: faraz101 :: Replies: 10 :: Views: 88606
Both diodes are on (short circuit), current in R = 1mA.
Electronic Elementary Questions :: 18.11.2008 20:10 :: narccizzo :: Replies: 5 :: Views: 655
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
Analog IC Design and Layout :: 25.04.2009 05:45 :: ESDSolutions :: Replies: 3 :: Views: 1861
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 (...)
Professional Hardware and Electronics Design :: 10.11.2009 05:15 :: NientePaura :: Replies: 0 :: Views: 819
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.
Electronic Elementary Questions :: 16.03.2010 05:40 :: powersys :: Replies: 4 :: Views: 1003
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 (...)
Analog IC Design and Layout :: 27.03.2010 04:09 :: IanP :: Replies: 1 :: Views: 386
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 (...)
Other Design :: 04.11.2010 21:29 :: bigjoe :: Replies: 4 :: Views: 925
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.
Analog Circuit Design :: 06.11.2010 21:37 :: flatulent :: Replies: 6 :: Views: 312
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
RF, Microwave, Antennas and Optics :: 06.02.2011 16:47 :: tony_lth :: Replies: 6 :: Views: 429
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 (...)
Power Electronics :: 13.04.2011 21:45 :: rmmaran :: Replies: 1 :: Views: 1512
It is possible, because when you change the polarity of the zener diode, the current becomes flowing through the diode and acts like a short circuit for your resistance. Therefore no resistance is detected by the multimeter. In fact, you can use this property to test diodes.
Analog Circuit Design :: 15.06.2011 08:29 :: ogulcan123 :: Replies: 2 :: Views: 443
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.
Power Electronics :: 05.09.2011 09:56 :: goldsmith :: Replies: 6 :: Views: 930
The problem is in your misunderstanding of the term supply current. It's the current consumption of the unloaded DAC chip, not output currrent. Besides short circuit current, the figure Min supply headroom tells which output current can be utilized.
Analog Circuit Design :: 03.09.2011 14:35 :: FvM :: Replies: 6 :: Views: 589
I find using a 12V lamp preferable to test SCR and TRIAC.
and trigger via a 1k (usually) resistor to gate.
(SCR) So in correct direction lamp will light and remain light when trigger removed.
The other direction the lamp should be completely off, triggered or not. If there is any glow
its failed either leak or a short.
Power Electronics :: 16.11.2011 17:18 :: xaccto :: Replies: 10 :: Views: 594
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 (...)
Power Electronics :: 16.12.2011 03:38 :: 466576266 :: Replies: 2 :: Views: 315
I am working on a project to charge my cell phone while I am riding my bike. I have a small bike dynamo that outputs 15 vac at about 6w (obviously very dependent on speed). This is fed into a full bridge rectifier (4-diodes), then through a shunt capacitor to smooth the voltage. this is then fed through a voltage regulator (LM 309). This g
Electronic Elementary Questions :: 26.12.2011 17:44 :: VAR_Buster :: Replies: 8 :: Views: 422
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 (...)
Hobby Circuits and Small Projects Problems :: 03.02.2012 02:15 :: 466576266 :: Replies: 3 :: Views: 758
Check output voltage without load. Then increase load. Regulator may be damaged. Use series resistor like 10 ohm on input side to limit current in accidental short circuit.
Analog Circuit Design :: 05.02.2012 11:38 :: ALERTLINKS :: Replies: 16 :: Views: 1018
can you do short circuiting the end side of cable ?
Professional Hardware and Electronics Design :: 08.02.2012 16:08 :: goldsmith :: Replies: 5 :: Views: 1297
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
Microcontrollers :: 10.07.2012 15:47 :: Cyrus the Great :: Replies: 1 :: Views: 298
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
Electronic Elementary Questions :: 29.12.2012 06:15 :: rfredel :: Replies: 1 :: Views: 304
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, (...)
Electronic Elementary Questions :: 03.01.2013 08:25 :: dipnirvana :: Replies: 3 :: Views: 168
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
Analog Circuit Design :: 30.01.2013 12:05 :: robismyname :: Replies: 1 :: Views: 125
I know that this is trivial question ,How do you find whether a circuit is open or short circuited.I have a broken headphone and when I try to find the problem using a continuity test.I have attached my circuit below.Now my question is how to find whether the circuit is open (...)
Electronic Elementary Questions :: 06.07.2013 22:04 :: adi0803199 :: Replies: 4 :: Views: 247
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.
Professional Hardware and Electronics Design :: 03.07.2003 06:32 :: andyyau :: Replies: 0 :: Views: 628
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.
RF, Microwave, Antennas and Optics :: 20.04.2004 21:07 :: IICCEE :: Replies: 1 :: Views: 523
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
ASIC Design Methodologies and Tools (Digital) :: 31.05.2004 08:52 :: stehenry :: Replies: 9 :: Views: 1721
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 (...)
Hobby Circuits and Small Projects Problems :: 26.08.2004 09:16 :: DarkJedi :: Replies: 11 :: Views: 1362
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.
Hobby Circuits and Small Projects Problems :: 27.09.2004 23:35 :: flatulent :: Replies: 7 :: Views: 1399
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.
Analog Circuit Design :: 30.10.2004 06:56 :: radiohead :: Replies: 5 :: Views: 4358
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.
RF, Microwave, Antennas and Optics :: 25.11.2004 00:44 :: flatulent :: Replies: 2 :: Views: 1119
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
Electronic Elementary Questions :: 26.11.2004 12:06 :: flatulent :: Replies: 3 :: Views: 1347
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 (...)
ASIC Design Methodologies and Tools (Digital) :: 07.03.2005 17:40 :: tutx :: Replies: 5 :: Views: 1642