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Power & Energy

6 Posts authored by: Kai Scharrmann
Whenever you visit a shopping center or cinema or basically any public building you might notice illuminated emergency exit signs telling you the way out in case of an incident. As such an incident might cause the mains power supply to stop working, at least in Europe there are requirements that these emergency exit lights need to keep running with a backup battery that is typically inside the light unit itself. Of course it's not enough that these lights exist - they also need to be regularly i ...
Some time ago I posted an article about how temperature affects battery measurements. What I was curious about at the time was how much impact temperature had when measuring lead acid or AGM (absorbent glass mat) batteries, and it turned out that the effect was bigger than at least I had expected. The obvious question at the time was: What about lithium ion batteries? For a closer look at how temperature affects the measurement of LIBs my device under test was a Samsung INR18650-35E cell. Like w ...
There is a not so surprising trend to replace lead-acid batteries used in all kind of systems or devices with lithium-ion batteries (LIBs). When checking lead-acid batteries in these devices or systems by service technicians then often a battery tester like HIOKI's BT3554 is used. That raises the question whether this or any other battery tester can also be used in the same way as with lead-acid batteries. From a sensitivity point of view the BT3554 offers a 3 mOhm range - so even measuring larg ...
The other day I posted something in this group about how temperature affects a battery measurement because I wanted to find out how much that impact actually is. There was great feedback regarding this post in the comments (thank you very much for that!) and I also got feedback from outside of this forum. One of these comments from outside told me that I "commited a capital sin by using the brass tabs on the battery terminals to connect the Kelvin probes of the BT4560 test cables". Yes - I ha ...
A widely used and very popular battery tester in the maintenance sector is HIOKI's handheld BT3554. In less than three seconds it precisely measures the battery resistance at 1000 Hz as well as the battery voltage and it lets you make pass / fail comparisons based on freely defineable threshold values. Depending on the version this tester comes with test leads that are either straight or L-shaped. Alternatively there is a clip type test lead called HIOKI 9460 - this probe has a temperature senso ...
A very popular HIOKI instrument is the BT3554 battery tester. It's a portable instrument designed primarily for maintenance purposes with voltage ranges up to 60V. Of course the BT3554 won't blow up when you accidentially apply 61V to it instead of the maximum 60V. In fact there are not many service cases for the BT3554 at all. However, about 9 out of 10 BT3554 that arrive in HIOKI's service department in Frankfurt, Germany are identified to have suffered some sort of over-voltage. The majori ...

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