374 Threads found on edaboard.com: Open And Short Circuit
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: 3400
what are differences between open circuit QHA(quadrature helix antenna) and short circuit QHA ?
RF, Microwave, Antennas and Optics :: 28.05.2013 01:07 :: redcrystalline :: Replies: 0 :: Views: 175
You can design a transmission line on any substrate. Make the bottom plane as ground plane.
For an open circuit you can just leave the line open and for a short circuit the line should be grounded using a Via hole to ground.
A little caution for the length of line (...)
RF, Microwave, Antennas and Optics :: 30.01.2011 05:13 :: waseemsh :: Replies: 3 :: Views: 1021
I see a tendency to complicate things more than necessary. In fact, an open circuit measurement should be sufficient to determine the exact windings ratios and also magnetziation current, magnitude and phase (respectively losses). short circuit measurement is another (...)
Power Electronics :: 18.02.2011 07:31 :: FvM :: Replies: 6 :: Views: 6115
Why are open-circuit measurements made on the low voltage side of the transformer, whilst the short-circuit results are obtained by feeding the high voltage side?
Electronic Elementary Questions :: 18.08.2011 18:08 :: sacko101 :: Replies: 2 :: Views: 2103
I read from various literature that a short circuited quarter wave stub is open for AC and short for DC.
Can somebody explain the reason behind this?
RF, Microwave, Antennas and Optics :: 16.01.2012 17:20 :: anu_pillai84 :: Replies: 4 :: Views: 1284
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 (...)
Electronic Elementary Questions :: 07.07.2013 10:31 :: kspalla :: Replies: 4 :: Views: 367
In many designs a short-circuit stub is utilized to create a path for DC current, both bias (with capacitor to ground) and DC return to ground, as well as the obvious impedance matching effect it provides. So the general answer to this question is that you cannot always substitute different length open and (...)
RF, Microwave, Antennas and Optics :: 23.07.2013 15:31 :: RealAEL :: Replies: 3 :: Views: 253
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: 2521
There are different types of smoke detectors considering how they must be connected. Basically they are:
well I believe a good start point is to try 4 wires first. These use 2 wire for power and 2 wires for signal.
In order to do a good circuit you must be able to distinguish three states
Hobby Circuits and Small Projects Problems :: 28.10.2005 16:05 :: omore :: Replies: 2 :: Views: 1318
Try some of these ideas
1. For devices that draw power from the line, measure the open circuit voltage and short circuit current to high precision (16 bit converter). These values should vary a little with time, but should take a step when the tap is insalled. This will only work if you start before (...)
Hobby Circuits and Small Projects Problems :: 21.10.2005 17:11 :: flatulent :: Replies: 10 :: Views: 1359
1) Hook a long length to the two ports of a network analyzer. The input impedance should be 50 ohms. If it is not, the cable is not 50 ohms (it has transformed the 50 ohm load in the network analyzer to some other impedance).
Another way with the network analyzer and a long cable. Hook one end of the cable to port I on the network
RF, Microwave, Antennas and Optics :: 20.01.2006 13:51 :: biff44 :: Replies: 3 :: Views: 1780
what is the 'K' here? can u give me the thevenin analysis and norton analysis.
If i find thevenin voltage Vth for input and norton current Isc for output circuit, and then divide Vth(input) by Isc(output) will input impedance of the circuit?
Is it valid???
k is mosfet parameter. I (...)
RF, Microwave, Antennas and Optics :: 25.04.2006 08:07 :: pixel :: Replies: 5 :: Views: 666
I take your question to mean why are all failures open circuit. The reason is that the metal melts and drops away by gravity leaving an open circuit.
The filament wire is intentionally wound with tension to make the wires separate when the one part melts.
Electronic Elementary Questions :: 28.07.2006 15:35 :: flatulent :: Replies: 3 :: Views: 1011
But, physically, there is neither absolute open nor absolute closed circuit.
Electronic Elementary Questions :: 13.04.2007 08:50 :: yjkwon57 :: Replies: 6 :: Views: 1133
when doing small signal (AC) analysis.. only alternating (that change with time) voltages are considered. since DC voltage source is not varying (fixed value) it is considered zero and is short circuited to ground.
similarly if its a DC current source it is open circuited..
hope it helped
Analog Circuit Design :: 18.07.2007 10:31 :: saad :: Replies: 8 :: Views: 1200
Hi.I want to ask about when a transistor burn what event for transistor
short circuit or open circuit
and I want to know about d13005
Analog Circuit Design :: 14.10.2007 12:41 :: ebi82 :: Replies: 1 :: Views: 581
short circuit is not discussed in the features of this circuit, only overcurrent protection is provided. (Of course overcurrent may include current caused by a short circuit.) See points 11.4 11.5 and 11.6 on page 8 of your link.
So you have to remove the extra load that has (...)
Analog Circuit Design :: 28.11.2007 12:01 :: unkarc :: Replies: 2 :: Views: 1046
We have an unkown tow-port ciruit. We obtain Z1, Z2, Z3, Z4 by open and short
one of the port. Can we know the impedance of this circuit?
Please see the attached.
Analog Circuit Design :: 09.05.2008 10:10 :: OMEsystem :: Replies: 2 :: Views: 458
I am designing an amplifier
and i have short circuit stubs with different Zo (non of them is 50) and different electrical lenght
and i need to conert them to open circuit stubs
how can i do that?
adding 90 degrees to them doesnt seem to be right
RF, Microwave, Antennas and Optics :: 10.07.2008 22:11 :: 3bweh :: Replies: 1 :: Views: 1240
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: 1259
I am trying to model an array of full wave dipoles in front of a plane reflector. The dipoles are fed in their centers by open wire lines ( symetric transmission line). As the antenna works at 1.3Ghz , getting a good in phase alimentation of all the dipoles is important.
Of course I know how to model the feeder , as it is simply 2 wires
Electromagnetic Design and Simulation :: 04.01.2011 05:43 :: f6dro :: Replies: 2 :: Views: 884
I am a novice in RF/microwave. Just learning it for the fun of it. I am currently reading a book called Microwave Transistor Amplifiers by Gonzalez. In the book he states that it is hard to find z,y,h, ABCD parameters for a two-port network because the open/short circuit conditions are hard to implement at high frequencies over (...)
RF, Microwave, Antennas and Optics :: 25.03.2011 19:12 :: skilambi :: Replies: 1 :: Views: 993
If you use relay then after the short circuit your relay will open and but when it will open and your circuit detects that there is no short circuit so it will close again but actually ur circuit is still in (...)
Analog Circuit Design :: 10.04.2012 10:51 :: Sajjadkhan :: Replies: 4 :: Views: 1232
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: 1471
second equation is wrong
While applying KCL, there is no current flow in the open output end. so one can not take Vc=0. infact that term in which you have taken Vc=0 will not appear in the equation at all.
the Vth can be cross verified by applying source transformations and moving towards output side
Electronic Elementary Questions :: 30.06.2012 22:02 :: bhav :: Replies: 4 :: Views: 577
(1)get the input admittance for open or short-circuited transmission line;
(2)according to the ABCD-matrix of parallel admittance, get the ABCD-matrix of parallel open/short circuited stub
RF, Microwave, Antennas and Optics :: 25.01.2013 19:32 :: burton :: Replies: 2 :: Views: 838
I often need to layout with negative film approach. It's like the Spliting Plane, but I only draw lines for which I want to clear. It's easiler. But this method cannot check open or short circuit. Does anyone know which software support this work. Or how do you do it?
PCB Routing Schematic Layout software and Simulation :: 24.01.2003 11:01 :: blueted :: Replies: 3 :: Views: 1608
Cells usually come packaged in a holder that is waterproof and is rated at open circuit voltage and short circuit current when the sun is shining directly on it at a normal (perpendicular) angle. There will be data sheet graphs of voltage-current for different sun angles. From this you can (...)
Electromagnetic Design and Simulation :: 02.04.2004 17:56 :: flatulent :: Replies: 1 :: Views: 1013
If transmission line is matched, line impedance=generator impedance=load impedance, the voltage along the transmission line is constant. In case of mismatch when load impedance is not equal transmission line impedance the reflexion occurs. It causes voltage minimums and maximums to appear along the line, so the voltage along the line continuously c
RF, Microwave, Antennas and Optics :: 27.02.2005 09:21 :: Borber :: Replies: 2 :: Views: 1083
deos any one know how to set a short and open circuit in HFSS
Electromagnetic Design and Simulation :: 09.03.2005 16:07 :: bouchy :: Replies: 11 :: Views: 2107
how to find the two port network parameters
(Z parameter , Y parameter , ...............)
without doing the open circuit and short circuit tests
Software Problems, Hints and Reviews :: 20.10.2006 15:17 :: mohamed saleh :: Replies: 1 :: Views: 895
if the voltage is AC ,and wires are long ,there will be capacitance and inductance effect (like power lines)
capacitance effect with ground can cause current to flow even if the end is open circuit.(leakage current)
inductance effect in the line can cause current reduction even if the end is shorted
Electronic Elementary Questions :: 20.06.2005 06:52 :: hani51 :: Replies: 4 :: Views: 739
what is your request, i fact it is not easy to realize the VSWR alarm accurately!
so you should provide more information for your request
If you have 7 dB attenuate (including filter and cable loss) between amplifier and antenna, is impossible to see if antenna end is open, shorted or connected correctly if approve
RF, Microwave, Antennas and Optics :: 06.08.2005 05:52 :: xxargs :: Replies: 2 :: Views: 707
Cann't I use rb7 rb8 when I use icd to debug?
when using icd to programming(icsp),should I open the connection between mclr and vdd of target board?
Microcontrollers :: 02.09.2005 20:12 :: xmli1976 :: Replies: 4 :: Views: 847
it is called as both virtual short and virtual open.
it just means the voltage of the two differential input is very close to each other.
it will happen in a negtive feedack configuration.
but the two terminals are actually open, because physically they are not connected and there is no current (...)
Electronic Elementary Questions :: 28.10.2005 14:05 :: pengboy :: Replies: 3 :: Views: 2142
When the switch is closed the inductor of 1 H and the capacitor are out of the circuit once the switch short circuit them.
When the switch opens, they sundenlly become part of the circuit.
In t(0-) the capacitor is completely discharged since the switch was closed for a long time, (...)
Mathematics and Physics :: 02.04.2006 17:10 :: claudiocamera :: Replies: 4 :: Views: 4361
First, you have to decompose R2 by Miller's theorem, where C1 will be open circuit in DC and short circuit for approximate all frequencies.
Second, you can remove R3 since it's connected to ground from both terminals.
Finally, try to solve for mid-band frequency and (...)
Analog Circuit Design :: 07.04.2006 08:18 :: seadolphine2000 :: Replies: 7 :: Views: 893
In the case of short circuit model, the RF device will use the input impedance of the next stage as its load.
In the case of open circuit model, the device is isolated from the next stage, however, the signal still goes through. The input impedance of the next stage won't affect the RF device, normally a 50ohm load should (...)
RF, Microwave, Antennas and Optics :: 15.04.2006 04:54 :: jon2000 :: Replies: 1 :: Views: 1565
It seems there are 3 voltage supply on circuit.
terminal AB current calculated with use of super position theoream.
in each step just one voltage (or current ) source is active.
and all others are disabled (short circuit for vlotage supply and open circuits for current (...)
Electronic Elementary Questions :: 13.05.2006 13:11 :: Davood Amerion :: Replies: 6 :: Views: 969
The same thing. All power is reflected. Difference between short circuit and open is that at short circuit the line voltage at load is zero and the current is double as it is at match. At open, the voltage at load is doubled and current is zero.
RF, Microwave, Antennas and Optics :: 23.06.2006 13:20 :: Borber :: Replies: 6 :: Views: 2049
Of course it is possible. You could use a resistor in series with the emitter/ source and make sure the transistor is biased in the active region (if it is good). Then you measure the voltage across the emitter/ source resistor. If it is too high, then the transistor is shorted. Too low a voltage indicates an open transistor.
You can (...)
Hobby Circuits and Small Projects Problems :: 16.07.2006 22:07 :: VVV :: Replies: 5 :: Views: 1097
Whenever you are required to calculate the impedance (resistance) viewed from a certain circuit, think about what you would measure between the two points.
When required to find the Thevenin or Norton equivalent between two points, you should replace the original circuit with just two elements: a voltage source plus a series impedance (resistance)
Electronic Elementary Questions :: 12.07.2006 21:17 :: VVV :: Replies: 8 :: Views: 2048
suppose i have "n" number of wire and all are independent to each other which connected to other terminals........ my problem is " if any short or open circuit occur among the wires, HOW WILL WE CHECK THAT?????? just by glowing of DIFFERENT colour of LED
like RED coressponds to short (...)
Electronic Elementary Questions :: 26.07.2006 11:34 :: riku :: Replies: 4 :: Views: 1298
How come you can short ideal voltage sources and treat ideal current sources as open circuit.
Electronic Elementary Questions :: 01.08.2006 14:46 :: jinyong :: Replies: 3 :: Views: 789
I'll take a stab at it...
You can reduce the gain by dividing the input signal by two, which, technically, doesn't reduce the gain but, rather, reduces the input signal, which, in turn, reduces the output.
However, the input resistance is QR; therefore, your divider must look like QR in the end.
Per Thevenin, you open I and short V. (...)
Electronic Elementary Questions :: 27.09.2006 06:13 :: Euler's Identity :: Replies: 5 :: Views: 1820
power system simulation
> software package. According to the web site, you can
download, use and
> redistribute it freely. It has a oneline diagram
editor. It can do
> Loadflow, short circuit and transient stability
More information for install and help
home . (...)
Software Links :: 28.09.2006 01:50 :: smxx :: Replies: 0 :: Views: 460
please i want to know how to calculate the two port network parameters in orcad 10.5 ( Z parameters , Y parameters , ................)
without doing the open circuit and short circuit tests
Software Problems, Hints and Reviews :: 20.10.2006 15:23 :: mohamed saleh :: Replies: 0 :: Views: 504
you have to do at lest one terminal open to find its value .
Analog Circuit Design :: 11.12.2006 09:44 :: manish12 :: Replies: 8 :: Views: 10266
open-circuit Characteristic is the graph of generated voltage against field current with the terminals open-circuited and running at synchronous speed.
short-circuit Characteristic is the graph of stator current against field current with the terminals (...)
Electronic Elementary Questions :: 05.03.2007 01:30 :: powersys :: Replies: 1 :: Views: 3179