EEVblog

By David L. JonesTechnology Education

EEVblog episodes

February 17 EEVblog 1734 – Uni-T UT892 2000V High Voltage Multimeter TESTED
The Uni-T UT892 High Voltage Multimeter is unusually rated to 2000V!
Teardown and testing time, is it any good?
00:00 – Uni-T UT892 2000V High Voltage Multimeter
02:39 – Unboxing
03:40 – FAIL right off the bat! Probes matter.
05:53 – Teardown
08:06 – Where’s the MOV’s?
09:07 – The case design leaves a lot to be desired
09:23 – PCB switch contact side
09:44 – Houston, we have a clearance problem.
11:20 – It’s going in unprotected
13:08 – The case sucks
13:56 – High Voltage testing within range
15:15 – What’s up with this NCV tester?
16:48 – Do we care about the autoranging and continuity tester at this point?
17:35 – 2500V test
19:05 – 5000V test!
21:03 – Inspection + chipset
21:26 – 5000V test again with cover off
22:20 – What a surprise! It failed exactly where I said it would.
23:25 – Proper high voltage design
24:50 – Conclusion
Forum: https://www.eevblog.com/forum/blog/eevblog-1734-uni-t-ut892-2000v-high-voltage-multimeter-tested/
27 min
February 06 EEVblog 1733 – Mailbag: 2GHz Power Rail Probe, Retro Chip Tester
More mailbag!
00:00 – Vetus Pars Retro Chip Tester
https://retrotroniks.com/product/vetus-pars-retro-chip-tester/
17:05 – PRP1 2GHz Power Rail probe
https://www.eevblog.com/forum/testgear/prp1-low-cost-2ghz-power-rail-probe/
22:07 – PRP1 Teardown
24:10 – PRP1 Circuit Explanation
27:08 – PRP1 Testing
32:09 – Comparison with Agilent 2GHz Active Probe
Forum: https://www.eevblog.com/forum/blog/eevblog-1733-mailbag-2ghz-power-rail-probe-retro-chip-tester/
40 min
January 30 EEVblog 1732 – 20yo 1000+ Cycle Panasonic Li-Ion Battery TESTED
How much capacity has this 20+yo 1000+ cycle Panasonic 14500 lithium ion battery lost?
00:00 – Panasonic electronic shaver teardown
06:30 – Battery dimensions match the type number
08:24 – The battery capacity test setup
10:40 – 500mA Constant Current test
11:38 – How much energy is left in a “flat” battery?
13:46 – 250mA Constant Current test
14:54 – 100mA Constant Current test
15:13 – Results analysis. Talking head Dave
19:11 – How to scale time in Excel
21:20 – How to get a characteristic battery capacity graph in Excel
24:35 – Energy in a battery and the characteristic curve area, it’s just an integral
26:30 – Optimising product design and battery cutoff voltage
29:13 – Battery current measured
Forum: https://www.eevblog.com/forum/blog/eevblog-1732-20yo-1000-cycle-panasonic-li-ion-battery-tested/
30 min
January 25 EEVblog 1731 – $50 Ziboo 17B Pro Multimeter vs $150 Fluke REVIEW
The $50 Ziboo 17B Pro 1500V Multimeter vs the $150 Fluke 17B MAX
Is it any good?
Forum: https://www.eevblog.com/forum/blog/eevblog-1731-$50-ziboo-17b-pro-multimeter-vs-$150-fluke-review/
37 min
January 14 EEVblog 1730 – AC Basics Tutorial Part 8: Apparent, Reactive & Real Power
Part 8 of the AC Basics tutorial series. Looking at the difference between Apparent, Reactive, and Real Power. Plus Power Factor
00:00 – Voltage & Current phase relationship
02:28 – Real Power
07:09 – Apparent Power
12:02 – Power transmission systems and copper losses
17:45 – Reactive Power
20:17 – It’s all a Fugazi, it doesn’t exist
21:52 – Power Triangle
23:46 – Power Factor
AC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHvD6M_7WeN071OVsZFE0_q-
DC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHtVLq2MDPIz82BWMIZcuwhK
Forum: https://www.eevblog.com/forum/blog/eevblog-1730-ac-basics-tutorial-part-8-apparent-reactive-real-power/
29 min
January 10 EEVblog 1729 – AC Basics Tutorial Part 7: AC Ohms Law
Ohms law applied to AC.
AC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHvD6M_7WeN071OVsZFE0_q-
Forum: https://www.eevblog.com/forum/blog/eevblog-1729-ac-basics-tutorial-part-7-ac-ohms-law/
12 min
January 09 EEVblog 1728 – AC Basics Tutorial Part 6 – Impedance, Conductance, Susceptance, Admittance
Part 6 of the AC basics tutorial video series, covering Impedance, Conductance, Susceptance, and Admittance.
00:00 – AC Tutorial Series Part 6
00:56 – Impedance
07:32 – Reactance vs Impedance
08:17 – Conductance
11:21 – The Fluke 87V measures conductance!
12:12 – Susceptance & Admittance
13:53 – Tying it all together
AC Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHvD6M_7WeN071OVsZFE0_q-
Forum: https://www.eevblog.com/forum/blog/eevblog-1728-ac-basics-tutorial-part-6/
16 min
January 02 EEVblog 1727 – REPAIR: Casio CT-X700 Keyboard
Simple repair of a Casio CT-X700 keyboard, with Sagan, and some really bad music.
Forum: https://www.eevblog.com/forum/blog/eevblog-1727-repair-casio-ct-x700-keyboard/
23 min
December 29, 2025 EEVblog 1726 – REPAIR of an EV Charger (Unusual Twist!)
Repairing a failed EV charger DC-DC converter had an unusual twist.
Forum: https://www.eevblog.com/forum/blog/eevblog-1726-repair-of-an-ev-charger/
23 min
December 19, 2025 EEVblog 1725 – Mailbag: with special guest Sagan!
Sagan joins Dave to open more packages, in everyone’s favorite segment Mailbag.
00:00 – The Connector Book! by Davide Andrea
https://connectorbook.com/
Listen to Davide on The Amp Hour: https://theamphour.com/708-all-the-connectors-with-davide-andrea/
11:02 – BLE CaberQu USB-C cable tester
https://caberqu.com
22:02- Teardown of the CaberQu
24:22 – Snaptron FREE Sample Box
https://www.snaptron.com/free-samples/sample-box/
24:55 – Sagan’s Knife Skills!
32:10 – Elecrow CrowPanel Pi Terminal
https://www.elecrow.com/pi-terminal-7-1024-600-ips-hmi-panel-all-in-one-module-raspberry-pi-cm4-industrial-computer-with-rich-interfaces.html
Forum: https://www.eevblog.com/forum/blog/eevblog-1725-mailbag-with-special-guest-sagan/
45 min