Thanks for the VERY useful video!! I couldn't make out the current on the ignition transformer. Despite the high voltage, this HV transformer current can be easily measured with a cheap DMM. I set the meter at the 200mA (AC) range, then TIGHTLY secured the high voltage wires on the meter leads ---NO SPARKS ALLOWED WHEN DOING THIS-- then turn on the (current limited) transformer. It should match the label current! One thing learned the hard way: If the DMM fuse happens to be open when you make this measurement, then you get a 10,000 volt arc, GOODBYE DMM!!! I first used this when I pulled several shunts on a de-potted (tar) neon sign xfmr (15kV@60mA)...got over 70mA and re-potted in paraffin.
I wonder what to do in situation faced by me? The two Neutrals from the two outputs 230 VAC of the Nitrox Inverter ( 3 KW - 24 V, SP - Hybrid _ by A.P.T. ) aren't allowed to be jointed! The Inverter demands the two Neutrals to be isolated and afloat! I'm rather perplexed. Obviously the two Phases are certainly to be distributed isolated! The problem faced has been that either regular Load RCD or the Smart Load RCD have been in the habit of tripping off upon Grid On / Off since installation. Even sometimes the RCD on the Input to the Inverter also goes off! The reason: the wiring of my home has become leaky for sometimes. I've been curious about the Phase difference of the two outputs of the Inverter. Is there any way to examine it's two lines 230 VAC (RMS) each. Probably phase difference of 120° with about 460 VAC (RMS) that amounts to be ~ 651 VAC RMS ! Moreover, the grounding croc clips of the O-Scope share the same common ground! Is there any way to compare the 2 outputs, one 'Regular Load' and the other 'Smart Load' be visualized on single O-Scope screen with custom devised High Voltage Probe(s) X100 on single or Dual Channel OScope? Note: The Inverter trips the RCD's on bringing the the neutrals near each other. I'm a medical doctor, who happened to be a life long Accidental Scientists. Help is awaited!
Ow that resistors are 5watters. But indeed double. But dont you think that a hv-load of 10watt is a little high load when you wish to measure on voltage multipliers? I myself used 2 5watt hv-resistors 200Mohm parallel to drive a 200uA analog.meter so full scale is 20kV. (2x 20kV diode (2CL77)& 2n2@35kV capacitor inculded of course). That is still too high load for measuring any multiplier output but its good enough for measuring the 10-40kHz AC that feeds them. Oh it is great&interesting&always helpfull to watch another man playing around with hv, especially while you do such precise measurements in your vids
this is nice but…. should you lose any ONE of those center resistors (even one of them) your oscilloscope is toast. you should use several resistors in parallel there in case one fails or insert a neon or something to short high voltage.
Not really, say you measure 20kV thats 200V at the scope... my 40kohm V sensing resistor blows, I'm still protected by two 45Mohm Resistors. scope internal impedance is 1M so scope voltage shoots up to 400V scope input is good to 600V. so I'm still OK.... if you want to be precautious you could always put a MOV across your Vsense resistor but in this case I don't think it is needed.
Nope, sorry kiddo, your circuit analysis is flawed. 4 quarter watt resistors will have a total max. power dissipation of 1 watt in series or parallel. Might want to go back to the circuit theory book and brush up.
@@sparkstarter You were rather condescending in this reply, but I looked it up and you're right. I wish you could've been a bit more considerate though.
Nicely done.
Thanks for the VERY useful video!!
I couldn't make out the current on the ignition transformer.
Despite the high voltage, this HV transformer current can be easily measured with a cheap DMM. I set the meter at the 200mA (AC) range, then TIGHTLY secured the high voltage wires on the meter leads ---NO SPARKS ALLOWED WHEN DOING THIS-- then turn on the (current limited) transformer. It should match the label current!
One thing learned the hard way: If the DMM fuse happens to be open when you make this measurement, then you get a 10,000 volt arc, GOODBYE DMM!!! I first used this when I pulled several shunts on a de-potted (tar) neon sign xfmr (15kV@60mA)...got over 70mA and re-potted in paraffin.
Thank you for sharing this project
I wonder what to do in situation faced by me?
The two Neutrals from the two outputs 230 VAC of the Nitrox Inverter ( 3 KW - 24 V, SP - Hybrid _ by A.P.T. ) aren't allowed to be jointed! The Inverter demands the two Neutrals to be isolated and afloat! I'm rather perplexed. Obviously the two Phases are certainly to be distributed isolated!
The problem faced has been that either regular Load RCD or the Smart Load RCD have been in the habit of tripping off upon Grid On / Off since installation. Even sometimes the RCD on the Input to the Inverter also goes off!
The reason: the wiring of my home has become leaky for sometimes. I've been curious about the Phase difference of the two outputs of the Inverter. Is there any way to examine it's two lines 230 VAC (RMS) each. Probably phase difference of 120° with about 460 VAC (RMS) that amounts to be ~ 651 VAC RMS ! Moreover, the grounding croc clips of the O-Scope share the same common ground!
Is there any way to compare the 2 outputs, one 'Regular Load' and the other 'Smart Load' be visualized on single O-Scope screen with custom devised High Voltage Probe(s) X100 on single or Dual Channel OScope?
Note: The Inverter trips the RCD's on bringing the the neutrals near each other.
I'm a medical doctor,
who happened to be a life long Accidental Scientists.
Help is awaited!
Ow that resistors are 5watters. But indeed double. But dont you think that a hv-load of 10watt is a little high load when you wish to measure on voltage multipliers? I myself used 2 5watt hv-resistors 200Mohm parallel to drive a 200uA analog.meter so full scale is 20kV. (2x 20kV diode (2CL77)& 2n2@35kV capacitor inculded of course).
That is still too high load for measuring any multiplier output but its good enough for measuring the 10-40kHz AC that feeds them.
Oh it is great&interesting&always helpfull to watch another man playing around with hv, especially while you do such precise measurements in your vids
this is nice but…. should you lose any ONE of those center resistors (even one of them) your oscilloscope is toast. you should use several resistors in parallel there in case one fails or insert a neon or something to short high voltage.
Not really, say you measure 20kV thats 200V at the scope... my 40kohm V sensing resistor blows, I'm still protected by two 45Mohm Resistors. scope internal impedance is 1M so scope voltage shoots up to 400V scope input is good to 600V. so I'm still OK.... if you want to be precautious you could always put a MOV across your Vsense resistor but in this case I don't think it is needed.
Calculator for voltage divider is on the website (Visit the Free Calcs Page):
www.sparkstarter.tech/
How do you get away with only 20M resistors when this guy uses 200M/200K???
Again you need to brush up on your circuit theory... see Ohm's Law. V=I*R so 20kV/20M = 1mA , and I'm using 2 of the 20M for a 40M total resistance.
@@sparkstarter should it be 20KV/40Mohm ?
@@rashidmdamin5552 Do you have excel? I put a free calculator on my website for High Voltage divider.
@@sparkstarter Yes, pls give me the link, tq.
@@rashidmdamin5552 See Free Calcs Page www.sparkstarter.tech/
I want to design Dc 100kv and ac 75 kv hv probe any help
I have an excel spreadsheet calculator I will try to get it on the website.
@@sparkstarter is it on your website yet?
@@johnnycash4034 Yeah Check out the Calcs Page
Connecting the 40K resitor by using 4pcs 10K in series does not increse wattage. You use 0.25W 4pcs then you have 0.25W total. This is serious flaw.
Nope, sorry kiddo, your circuit analysis is flawed. 4 quarter watt resistors will have a total max. power dissipation of 1 watt in series or parallel. Might want to go back to the circuit theory book and brush up.
@@sparkstarter You were rather condescending in this reply, but I looked it up and you're right. I wish you could've been a bit more considerate though.
@@sparkstarter I will tell you where you flawed 😀....you didn't consider scope input impedance in parallel with your quarter watt resistors ...:-)
@@sparkstarter What a pretty poor response. Not the best way to gain subscribers.
@@mqblowe Nope, sorry kiddo, you gain subscribers by having useful content, not a coddling and apologetic comments section.