Filtering frequency revisited

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Made another go at this since I worked a few chapters in my text book

Wiring this old artifact ballast in series with a 1000 ohm resistor and putting variable frequency through it.  With predictable results 

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So now when people see me wandering around wondering what I'm thinking about it's gonna be....."so the resistance of the inductor (ballast) goes up.....

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I remembered I had a monster choke so I went and grabbed it and repeated the tests


The results were not what I expected it is such a beast I figured it would have crazy reactance a lower frequency

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But it let me go much higher

 

I have a lot to 💬 ponder 

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Btw I used an atlas lcr45 on the ballast it measured about 755 mH

So on the label on the monster choke I guess hys means Henrys then it's 5 mH 

I have very small 10 and 15 mH inductors so why is a 5 mH so big and heavy 🪨 

Edit: because it can handle 22.5 amps and 1500 volts

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So then I'm doing a bunch of problems where the output voltage ⚡ is divided by the input voltage at different frequencies and do some more calculations with logarithms etc and it gives me the frequency response (?).....in decibels...?

I thought decibels was like dude how loud 🔊📢 is stuff.  Like a 70s Who concert or 707 taking off.

Oh well back to the grind 

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I'm doing lots of the same stuff over and over with resistors capacitaters and inductors 

I've been impressed with this hobby that experimental results closely match calculations.

However I'm wondering if there is a limit to how accurately my multimeter can measure ac voltage ⚡ drops (rms) at different frequencies....like 20 khz

Oh well I guess that's why we have oscilloscopes (Vp-p)

Or bench multimeters ? 

I'm sure it would be cool 😎 to have a bench meter but I certainly don't need voltage to twenty decimal places or a real earth ground (thanks G1  )

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Your meter should have a spec for the AC volts range as far as frequency response.
My true RMS meter says 45Hz to 2Khz.  A lot of them are just for measuring AC volts in the 60 to 100Hz area.
Yes, scope is best bet for higher freqs.

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Here is an 🥼🧪 experiment I just did

I was really impressed how the measured hung right in there with the calculated

Unfortunately at 50 khz it went out the window
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Here is the "schematic" 

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I know

I should have remeasured everything with my scope.   

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Ok I went and redid the experiment this time using my scope to measure the voltage drop across the resistor at different frequencies and got some good results 
(bottom left)
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gratuitous scope pic

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So all I need now is a gif of Keanu going
"DUDE.....your meter can't handle it "