Uploaded March 2018 | Updated September 2026, 1 week ago
Another 2 Charge-Meters from Ebay of different power and price.
Both share a similar design and features.
Accuracy is much better than the first one tested.
But they are not very useful when it comes to testing primary or rechargeable batteries with low voltages and low currents.
A shutdown/cutoff-feature to protect the battery from being totally drained is missing. Setting low discharge currents is next to impossible instead of the combination of a fine-/coarse potentiometer.
No 4-wire measurement (Kelvin-connections) so that voltage, power- and energy-measurement is way off at higher currents.
Another 2 Charge-Meters from Ebay of different power and price.
Both share a similar design and features.
Accuracy is much better than the first one tested.
But they are not very useful when it comes to testing primary or rechargeable batteries with low voltages and low currents.
A shutdown/cutoff-feature to protect the battery from being totally drained is missing. Setting low discharge currents is next to impossible instead of the combination of a fine-/coarse potentiometer.
No 4-wire measurement (Kelvin-connections) so that voltage, power- and energy-measurement is way off at higher currents.
![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")
