Uploaded January 2017 | Updated September 2026, 1 week ago
Rogers demonstrates how you can find out if your multimeter has an high-impedance mode.
Support Roger on Patreon: patreon.com/kainkalabs
We found out by chance that the cheap Unity UT139C multimeter has an high-impedance mode when you select the DC-mV-range.
The input sigal is then routed directly to the ADC-input skipping the input resistor-divider.
Quite helpful in some measurement-situations where even the usual 10 Megohm input-impedance of a multimeter presents too large a load to your DUT.
Rogers demonstrates how you can find out if your multimeter has an high-impedance mode.
Support Roger on Patreon: patreon.com/kainkalabs
We found out by chance that the cheap Unity UT139C multimeter has an high-impedance mode when you select the DC-mV-range.
The input sigal is then routed directly to the ADC-input skipping the input resistor-divider.
Quite helpful in some measurement-situations where even the usual 10 Megohm input-impedance of a multimeter presents too large a load to your DUT.
![Every Maker should have...[Pt.37]...a Rubidium Frequency Standard](https://i.ytimg.com/vi/zW5ffFuEQsw/mqdefault.jpg "Every Maker should have...[Pt.37]...a Rubidium Frequency Standard
Nowadays yu can easily build your own Rubidium Frequency-Standard with 9 digits precision.
Support Roger on Patreon: https://www.patreon.com/kainkalabs
You need for adjusting your frequency counter and quartz-controlled clocks.
Some demos and a look inside.
Type: EFRATOM LPRO-101
David L. Jones Videos about what´s inside the black box of a rubidium frequency standard and how it works:
http://www.youtube.com/watch?v=I55uLRRvLCU
http://www.youtube.com/watch?v=FRdGsSu5Nec
IN-17 miniature Nixie-clock:
https://www.kosbo.com/clocks/in-17-nixie-clock.html")
