DIY 10x oscilloscope probe with DSO138 scope

Hello KZbinrs,
Today I'm testing my DIY home-made 10x probe, with my DSO138 oscilloscope.
Thanks to my fellow KZbinrs for providing great examples for building 10x probe. I made this probe to observe 120 Vac line voltage.
Materials used to build probe:
1 ea. 10 Mega Ohm 1/2 watt resistor
1 ea. BNC connector
2 ea. alligator clips
6" of 50 ohm RG8 coax cable
2 pieces of old computer power supply wire
2" piece of 3/8" copper tubing
Rubber splicing tape
Solder and iron
I first ran 2 measurements with the stock 1x probe for comparison; then switched to the 10x probe.
An old cordless drill battery charger provided the test signals for the low voltages.
As seen, the 10x probe is not exactly dividing by 10, but I can now observe signals up to about 200 Vac on the DSO138, using my 10x probe.
All parts dug out from my trusty junk box.
Thanks for watching.

[@Scyth3934]

Just what I was looking for

[@burak8582]

I was looking for something like that. Thank you.

[@josepeixoto3384]

can i wrap some aluminum foil instead of the copper tubing, that i don't have?

[@mu8502]

hi can I use 150 MHz probe on 50MHz oscilloscope?

[@suji730]

By using 10x probe can we measure mains voltage?? Please reply i have an idea to brought this scope iam only beginer

[@rogermathura]

You should stay away from mains supply!

[@suji730]

@@rogermathura Ops!!! I have know about all the precuations while handling mains

[@dragan3290]

10 times probe and scope goes Max 50 volt peak to peak. So 500 volts peak to peak! 240 volts is fine!

[@Harry001by7]

1. Hissing/ beep sound coming from the device. 2. Test rectangle signal is not flat at peaks (I am using 9v supply from buck module). Any help ? :)

[@rogermathura]

The device does not have a speaker

[@Harry001by7]

@@rogermathura thanks for your response. Yes of course the device doesn’t have a speaker, but the radial inductor does noise and here is the issue with this radial inductor - noise is coming from this one. So, any help? What is the issue i am facing? How to rectify this ?

[@rogermathura]

@@Harry001by7 Sorry, I don't know. I've never heard an inductor hum. Maybe, the soldered contacts are loose.

[@kubakrawczuk7450]

Ik im late but in the manuał u should find how to calibrate it

[@Harry001by7]

@@kubakrawczuk7450 tried, not working

[@joeshmoe7899]

Real 1x-10x probes cost $5 on aliexpress, delivered.

[@wendellhammond7853]

Crappy audio come on guys watch before you post