Nice channel - hope you continue to make more videos! I would be interested in seeing more of the power panel that is present in the background at the 20 minute mark. What choices you made, how it's constructed, safety features and considerations, etc. Looking forward to the next video!
Thank you. I will work on a video on my "Dim Bulb Current Limiter" on a video in the next few months. There's many video's on them on here on different channels, I just added my few twists for function and adjustments that I thought of for my own needs.
My favorite poor man's way of measuring high resistances is to use the input resistance of the DMM as the top resistor in a voltage divider, that way you can easily measure low leakage currents or high resistance values with just a little math. The only gotcha is you need to check the DMM manual to see the impedance at different ranges and use it in your calculations. With this method and a simple voltage multiplier connected to the grid you can easily measure isolation resistance of transformers or leakage of high voltage capacitors at the rated voltage, I also use a variac to set the appropriate voltage.
Yes, that can work, but there's a LOT higher voltage involved, and more complicated math as well. Conductance is related to resistance through a direct inverse formula, and all 3 of these devices use non hazardous voltages.
@@poormanselectronicsbench2021 you can also use this method with just a few volts, with a DMM with a 10M impedance and 1mV resolution you can easily measure 10GOhm with just 1v supply voltage and most meters these days are even better.
@@Gengh13 Hi would you be able to demonstrate what you are talking about on your channel one day? I subscribed to your channel so I get Notification, thanks 🙂
@@Gengh13 : How you ever got 1 mA resolution meter to show current to flow through a 10 Gigaohm resistance at 1 Volt is a mystery to me, but if you did, rock on! I did a practical test of your statement, as well as working out the ohms law math.I used a fully charged 1.5V D cell battery for my voltage source, and a Keithley 197 Bench DMM to measure with, as it can measure down to .001uA, or, 1 NanoAmp. Using a 10 Gigaohm resistor in series, the meter would not display a value. Using a 1 MEGAOHM resistor in its place, the meter read 1.5 uA ( Microamps) Using ohms law, confirms the 1 Meg resistor current, and if you do the math on 1.5 volts divided by 10,000,000,000, you get 1.5 X 10 to the negative 10th power, or 150 pA (PicoAmpere) I set up a circuit in Multisim SPICE with a DC source and a resistance here, using a 1 Volt DC source to verify my measurements were correct. www.multisim.com/content/Qp79GemU7pW2crwUhZPp36/basic-dc-current-circuit/ And, as far as the "10 Meg input resistance / Impedance," that goes away when you use an ammeter function on a directly connected meter, as they work on the principal of reading the voltage drop across a low resistance calibrated internal shunt, and then calculating it into an Amp, Milllamp, MicroAmp or NanoAmp value. Even if you used an voltmeter, to read voltage drop across a 10G resistor, it would need to read accurately down to a PicoVolt range, I don't think there are common DMM's capable of reading that low.
@@poormanselectronicsbench2021 you use the meter in voltage mode, not current, what you get is the voltage across the input resistance, acting like a 10M shunt, that's the magic of this technique that gives you the sensitivity. With that the Resistor you are measuring is: Rx=Rinput*((Vbatt/Vmeasured) - 1) I hope now it's clear. Edit: that equation is simply derived starting from the ohms law of the unknown resistor and replacing with know values, the current is the same as Rinput which is Vmeasured/Rinput and the voltage across that unknown resistor is Vbatt-Vmeasured.
Hi, thank you so much! I have the same Fluke 83 V. And did not know about that function. I enjoyed this video so much that I subscribed and hit that bell! I'm new to electronics and learning. Keep up the good work and looking forward to more videos. 🙂
I am not sure of all of the meters in the Fluke line that are have the function, but I was really surprised that some of the older, unmarked ones did.I am not sure if I will be a great source of "teaching", but I am planning to put out content that isn't too redundant here, mostly on vintage test equipment and some audio gear that hasn't been covered much or at all up to this point. I'm glad you enjoyed the info.
@@poormanselectronicsbench2021 No problems 👍 but I checked out some of your other videos, especially I like E002 Gigaohm Capacitor Leakage Tester project! Don't sell yourself short your doing a good job at teaching 🙂
Thanks. It's always good to find "freebies" wherever we can nowadays. The funny part is that some of them are well hidden in equipment that isn't marked for that function at all.
Well done. I've the 8024B that I bought at a hamfest for $5. Works great after replacing the protection resistor. Wish I could find a new LCD screen for it. 👍
I am not going to debate that in this video, as I really didn't make a comparative stance on that here, it would be more pertinent of a comment on my E_001 video. I also hope you bring this to Mr. Carlson's attention, I am sure he would love the info.
bro.... nice,,, good work,,,,,, ns test starts around timeline 20 30
@ 20:30 👍 Thanks! I did fumble with the 83 a bit, as I don't use it often for that feature.
Nice channel - hope you continue to make more videos! I would be interested in seeing more of the power panel that is present in the background at the 20 minute mark. What choices you made, how it's constructed, safety features and considerations, etc. Looking forward to the next video!
Thank you. I will work on a video on my "Dim Bulb Current Limiter" on a video in the next few months. There's many video's on them on here on different channels, I just added my few twists for function and adjustments that I thought of for my own needs.
Thanks for this tip! I will try this conductance feature next time I have to measure some small leakage.
My favorite poor man's way of measuring high resistances is to use the input resistance of the DMM as the top resistor in a voltage divider, that way you can easily measure low leakage currents or high resistance values with just a little math. The only gotcha is you need to check the DMM manual to see the impedance at different ranges and use it in your calculations.
With this method and a simple voltage multiplier connected to the grid you can easily measure isolation resistance of transformers or leakage of high voltage capacitors at the rated voltage, I also use a variac to set the appropriate voltage.
Yes, that can work, but there's a LOT higher voltage involved, and more complicated math as well. Conductance is related to resistance through a direct inverse formula, and all 3 of these devices use non hazardous voltages.
@@poormanselectronicsbench2021 you can also use this method with just a few volts, with a DMM with a 10M impedance and 1mV resolution you can easily measure 10GOhm with just 1v supply voltage and most meters these days are even better.
@@Gengh13 Hi would you be able to demonstrate what you are talking about on your channel one day? I subscribed to your channel so I get Notification, thanks 🙂
@@Gengh13 : How you ever got 1 mA resolution meter to show current to flow through a 10 Gigaohm resistance at 1 Volt is a mystery to me, but if you did, rock on! I did a practical test of your statement, as well as working out the ohms law math.I used a fully charged 1.5V D cell battery for my voltage source, and a Keithley 197 Bench DMM to measure with, as it can measure down to .001uA, or, 1 NanoAmp. Using a 10 Gigaohm resistor in series, the meter would not display a value. Using a 1 MEGAOHM resistor in its place, the meter read 1.5 uA ( Microamps) Using ohms law, confirms the 1 Meg resistor current, and if you do the math on 1.5 volts divided by 10,000,000,000, you get 1.5 X 10 to the negative 10th power, or 150 pA (PicoAmpere) I set up a circuit in Multisim SPICE with a DC source and a resistance here, using a 1 Volt DC source to verify my measurements were correct.
www.multisim.com/content/Qp79GemU7pW2crwUhZPp36/basic-dc-current-circuit/
And, as far as the "10 Meg input resistance / Impedance," that goes away when you use an ammeter function on a directly connected meter, as they work on the principal of reading the voltage drop across a low resistance calibrated internal shunt, and then calculating it into an Amp, Milllamp, MicroAmp or NanoAmp value. Even if you used an voltmeter, to read voltage drop across a 10G resistor, it would need to read accurately down to a PicoVolt range, I don't think there are common DMM's capable of reading that low.
@@poormanselectronicsbench2021 you use the meter in voltage mode, not current, what you get is the voltage across the input resistance, acting like a 10M shunt, that's the magic of this technique that gives you the sensitivity.
With that the Resistor you are measuring is:
Rx=Rinput*((Vbatt/Vmeasured) - 1)
I hope now it's clear.
Edit: that equation is simply derived starting from the ohms law of the unknown resistor and replacing with know values, the current is the same as Rinput which is Vmeasured/Rinput and the voltage across that unknown resistor is Vbatt-Vmeasured.
Hi, thank you so much! I have the same Fluke 83 V. And did not know about that function. I enjoyed this video so much that I subscribed and hit that bell! I'm new to electronics and learning. Keep up the good work and looking forward to more videos. 🙂
I am not sure of all of the meters in the Fluke line that are have the function, but I was really surprised that some of the older, unmarked ones did.I am not sure if I will be a great source of "teaching", but I am planning to put out content that isn't too redundant here, mostly on vintage test equipment and some audio gear that hasn't been covered much or at all up to this point. I'm glad you enjoyed the info.
@@poormanselectronicsbench2021 No problems 👍 but I checked out some of your other videos, especially I like E002 Gigaohm Capacitor Leakage Tester project!
Don't sell yourself short your doing a good job at teaching 🙂
Nice topic!and pretty neat fluke :)
Thanks. It's always good to find "freebies" wherever we can nowadays. The funny part is that some of them are well hidden in equipment that isn't marked for that function at all.
Well done. I've the 8024B that I bought at a hamfest for $5. Works great after replacing the protection resistor. Wish I could find a new LCD screen for it. 👍
It's nice to find an old warrior for next to nothing that still functions well. Thanks for the view.
👍👍
ᑭяỖｍｏ??
Voltage at capacitor rating required to measure leakage unless capacitor is not a capacitor anymore.
I am not going to debate that in this video, as I really didn't make a comparative stance on that here, it would be more pertinent of a comment on my E_001 video. I also hope you bring this to Mr. Carlson's attention, I am sure he would love the info.