{507} INRUSH / Input Surge Current Measurement Using DSO Digital Storage Oscilloscope
Vložit
- čas přidán 26. 11. 2021
- in this video i demonstrated how #INRUSH / #Surge Current #Measurement Using DSO Digital Storage Oscilloscope
the inrush current or input surge current or switch-on surge is the maxima instantaneous input current drawn by an electrical device / component or group of components when first turned on. AC electric motors and transformers may draw several times their normal full-load current when first energized, for a few cycles of the input waveform. switch mode power supply SMPS / inverter ac boards, inverter welding machines and converters also have inrush currents much higher than their steady-state currents, due to the charging current of the input capacitance.
while selection of over-current-protection devices such as fuses and circuit breakers is made more complicated when high inrush currents must be tolerated. The over-current protection must react quickly to overload or short-circuit faults but must not interrupt the circuit when the (usually harmless) inrush current flows. What Is Inrush Current. measuring inrush current using oscilloscope in smps or welding machine. it can be monitored
inrush current, inrush current measurement,inrush current measurement using oscilloscope,surge current measurement,surge arrester leakage current measurement,haseeb electronics,input surge current measure on dso,inrush current measurement using digital storage oscilloscope,measuring inrush current,measuring inrush current with an oscilloscope,measuring inrush current using oscilloscope,what is inrush current,inrush current in smps,inrush crrent protection - Věda a technologie
Masha Allah
Hamesha ki tarah achchi jankari diya hai
big thumbs up 👍
masha Allah very informative video
thanks for sharing
best wishes from uk 🇬🇧
Great tutorial my friend watching here from manila Philippines sending my full pack Soport , see you on your next video no worry's idol I love ads
اللهم بارك
وفقك الله
Nice job dear brother 👍 Stay blessed
Superb tutorial as always thanks!
best regards
Excellent thanks for sharing this informative video
Cool share 🙂
Best sharing your thoughts on your adorable video
Excellent! Thank you!
best regards and lovely thanks
We are also depending from you to give us very good informative information. Thank you sir
بارك الله فيك اخي العزيز
بارك الله فيك وزادك من العلم
اللہ یسلمک و یسعدک
thank you for great information
Mashallah very nice very nice very nice video
excellent work
Wow masha Allah
Wonderful and superb explanation 👏
Keep up the good work
Ma sha Allah zabardast sharing Bro I love your videos keep it up 🌹🌹
Outstanding video Haseeb
it is my pleasure. please accept my best regards
woderful information.very technical approch to measure input surge current.great work keep it up brother
Informative practical tutorial brother. Happy weekend
Awesom information
Wow excellent tutorial thank you for sharing 👍
thanks a lot dear sister
Thank you very much sir I learn a lot from you Now I fix Power supply and ad board for slots Machine some I can fix some I can not fix I am new to this I use your techni for troubleshooting keep it up sir 🙏🙏🙏🙏🙏
You are most welcome
it is my pleasure that my efforts are helpful. stay blessed and i wish you huge success in this field
Masha allah amazing work Nice topic excellent channel thanks for sharing
Jazaak Allah kahir
Vedeo is very informative, this type of knowledge can't be found nowhere. You teach us practically and theoretically in a simple language, by this electronics is a difficult subject you made this so easy. Now I can understand electronics very easily.Such type of electronics knowlege can't' found nowhere. Pls make detailed vedeo on transform less circuit design calculations of pf and poler capacitor. Because u can explain batter. Thank u so much. God give u every thing. You are doing nice work, maney people are earning from this work and u are making them expert in there job. Thanks again.
Good job 👌👌👌
Thanks brother very useful
Wonderfull Upload liked It # 149
Good information
the friend, excellent happy, blessings
Nice sharing
special thanks
Good 👍
Very nice video! Please make a video showing us how to create a delay for the NTC bypass relay.
Very good
Watching sir to your nice tutorial n👍🇵🇭
Excellent 👌
best regards
nicely explained Sir
Thanks and welcome
Thanks sir👍
nice Good
Lk 45 brother 👍👍👍
Very good and useful information sir thanks for sharing this information to us
best regards and lovely thanks
Very nice explanation
best regards dear sir
6:23 Discharge cappacitor - SIMPLY EPIC !!!
yes it is better than discharging with our 2 fingers and then having bandage for 2 weeks LOL
personal safety and equipment safety must be our first priority. as the capacitor bank is much dangerous and it is silent killer,
@@HaseebElectronics I wonder that wouldbe a bulb 230V AC 75W good enought to discharge SMPS main cappacitor and a bit afraid it's not enought and it wouldbe burn. BUT don't know the soldering iron it's so good. Please take my congratulations and really appreciate your knowledge, experience and own creative skills.
Nice video Sir
best regards
Thankyou sir very well explained video sir g
best regards and special thanks
Nicely explained, thanks for nice presentation.
One small suggestion: You could have shown a simple circuit diagram on the paper to make it further easier.
I have a similar power supply and the capacitor busted. Then changed it with same capacity but 1-2 hrs later it continuously burst. What can cause this?
Walikum Salaam Janab Bhai Sahib
well sir All of your video are very informative... even this video explains the proper fuction of PTC
but your Video's title says How to measure current with DSO... BUT your video was about PTC....???
Sir adab,inverter ac ka ek super video banao,jaruri
The thermistors used for surge protection in smps input circuits are always of NTC type, not PTC. PTC thermistors, as an example, were used in series with the degaussing coil used in colour CRTs. The incandescent lamp you use in series with the psu under repair, as a second example, works in the same way a PTC thermistor works. For both cases, initially their resistance is small, allowing momentarily maximum current to pass (and degauss, or feed normal current to the circuit in the case of the lamp in series) and then, immediately, decrease the current by increasing their resistance, thus rejecting practically the load.
NTC thermistors work exactly in the reverse way. They allow reduced initial current due to their high internal resistance when being cold and then, as soon as current is passing through them, they reduce their internal resistance, allowing the maximum current to pass (this resistance reduction being the practical effect of their negative coefficient, in contrast to the PTC category). Furthermore, in the case of the power handling thermistors, their resistance change depends on the temperature developed in their body, but this temperature has to do with the current passing through them, not with the environment temperature (which is the case for small thermistors which are used for temperature measurements or compensation circuits).
It would be much better if you had registered the current waveform in the oscilloscope, rather than the voltage one, since you study here the inrush current effect. In other words, it would be more didactic for your readers if you had registered the current waveform, in form of voltage drop across the terminals of the thermistor, which would be much more realistic representation of current for your explanation. The voltage involvement causes more confusion to this analysis, not being as comprehensive as it should...Nice try anyway.
i am grateful for your detailed explanation. moreover your suggestion is valuable. i will do it surely
please accept my best regards and special thanks
in low power supplies NTC is used for inrush protection
but in inverter AC PCBs, Washing Machines, Welding machines, it uses PTC
@@HaseebElectronics Without any intention of being myself rude, as regards power handling thermistors, I have never seen PTC types powering welding machines etc. Such a use would really make no sense, because we always in these cases need the "soft start" function, which means reduced current at start up (due to the high initial resistance of the thermistor and then transition to a low resistance state, which exactly is the effect of the negative temperature coefficient of the thermistor) allowing full current afterwards (by the thermistor itself reducing its internal resistance, because of the temperature developed within it). This function can be done only with NTC thermistors.
The PTC thermistor, according to the voltage divider explanation given in the video, will not allow the current needed for the load, just because its small initial internal resistance will increase to a high value rapidly (reverse effect of the soft start). In other words: a) NTC thermistor: its resistance decreases by the temperature, thus the current through it increases (Ohm's law) and b) PTC thermistor: its resistance increases by the temperature, thus the current through it decreases...
Just think the incandescent lamp use (PTC behaviour) in testing smps psus. When the filament is cold, it's resistance is very low. This is the reason we see the initial glow on a good power supply. Then it gets rapidly hot, reducing the current, and it doesn't glow any longer (which happens if the device under test represents a resistance lower than that of the filament, under the given circumstance, or has a dead short)...
👍
best regards dear
Sir would you like to make video on SMPS EMI/EMC with calculation.i am working in this field since more than 6 years but still not sure how to calculate it.
👍👉🌹
A bathroom shaver socket makes a good low power isolating transformer for test equipments, I should have added UK bathroom shaver socket, I just found out in other countries they dont come with the isolating transformer
Since you are talking about inrush current I have a question for you, I have an AC unit where the initial switch-on current is 35 amps, it use a ptc for the start winding, my question is can I use an ntc in series with the start ptc to limit the inrush to maybe 20 amps? even though the inrush is for only about 0.5 second the electric meter still register it so I get charged about 2p each time the AC switch on
use a ac soft starter or time delay unit for required rating (search online)
as you deal with lots of power overa considerable time (yes 0.5 s is a big time while considering you have been charged 2p) also these tiny Thermistors are resistors at the end of the day and wont be suitable for such large units
you may ask what about high power smps and still use it? yes but now people are upgradin them to relay based time delay units
Great video. Wouldn't you use an NTC type thermistor to limit the inrush current ?
yes thermistor must be used as current limiter. either it is NTC or PTC, (it will selected on device type and its usage
Maasyaa Allah tabarakallah
Great tutorial sir, but I want to ask what type the oscilloscope and how about oscilloscope setting? I try to measure the inrush in battery output so I use shunt for that, but cannot displaying in oscilloscope well, I use the GDS-806S oscilloscope. Thankyou very much sir.
yes Instek GDS-806S is superb.
for current measurement you have to set time /Div at high time ( 0.5 sec or 1 Sec) so that the sweet rate may slow and it will provide stay on the screen
set volt/Div to your required range. but setting to higher range with 10x attenuation is good,
when the one wave is captured, stop the DSO (RUN/STOP key)
then you can measure / analyse the signal freely
@@HaseebElectronics thankyou very much sir.
I already try using time/div like you say, but the signal cannot stay on the screen, i mean it so fast and lost before i push the stop button. If like that, is any something wrong from my setting on oscilloscope?
sir please make video on simple 5 volts smps adapter and explain each block and voltage levels thank you
Sir u r great.love from heart.sir can you design a 1000 watt pure sinewave inverter crkt of h bridge combination without microcontroller....plz sir....i want to replace the microcontroller with SG3525 ic....
A.o.A sir sir ma na uc3843 say smps bny ha ups ka charging wala transfermer laga
Ma na trancfermer ma say tik tik ke awaz ati ha as ka bta day q ati ha
Did inrush current happen in Los and regulators ?
no, inrush protection is for protection of the circuit
it doesn't involve in regulation or any loss
Assalam o Alaikum
I want to run an alternator with 12v dc motor
Which motor will capable for this?
Good morning sir
Please make video on non inverter ac Pcb working please sir
Sir can you Explain IGBT Based Stabilizer Board....
Can i Use Single isolation transformer to connect Both Test circuit and OSCILLOSCOPE
yes we can
just we need to remove earthing safety ground from secondary side of the transformer
@Haseeb Electronics sir , i have 1 isolation transformer and There r two socket outlet of isolation transformer...
And Can i Connect Dso and Test circuit toh both socket oulet
yes brother you can use it
Salam brother how are you and telling detail How to fix 🇺🇲🙋♀️
Very good explanation but I'm a bit confused. I was always taught never to float your scope and use an isolation transformer for the DUT.
in both cases it is same while using DSO
if we use CRO, in that case we must use isolate the Unit Under Test (UUT) and TMDE should be grounded
but while using un-isolated UUT, it is best to isolate the DSO,
it have no issue, as we are applying high signal and low signal at test jack (BNC) which have high inout impedance, so its internal circuit will check the potential difference
i always isolate my DSO only. and my other bench power supply is also isolated
@@HaseebElectronics Thank you for that explanation. Always enjoy seeing videos of scope used in real world applications. There are very few videos that actually show how to use a scope to test pcb's or test IC's in both low voltage area and primary area but a handful of videos on how not to blow up your scope, which I am always concerned about when I use it. Most videos "How to use a scope" only show just the basic set up and not real world applications.
I float analogue scope when working on live side switcher, only if there is no one around to touch anything while I'm working on it, dso usually are plastic case with IP rating so there isnt any metal exposed
sir please make video on isolation transformer and can we make it by connecting 2 transformer back to back like 230v 12v =====12v 230v ac
14.7 ohms or ampare?
these are amperes, sorry for miss-pronunciation
(with age factor sometimes, we mix voltage with current, and current with ohms. because a part of life is gone this Ohm's Triangle, so we feel dizzy with these words LOL 😂😂😂😂 }
Aur ak as ke output 70 votl arhi ha phir tik tik ni karta jb volt kam karta ho to phir tik tik ke awaz ati ha
Ferquncy ma na scope say chek 65khz thi
👍
thanks a lot