I am pleased to announce that my equipment has just been expanded by a couple of two new meters: the DM6802B dual-channel thermometer and the GM1358 sound level meter. The first one is usual thermometer using K-type thermocouple probes with minimum temperature of −50 °C and maximum of 1300 °C. The resolution is 1 °C and accuracy ±2.2 °C or ±0.75 % (whichever is greater). It can display one of the channels or substract them directly. Thanks to that I can save some time during temperature measurement as the probes can be both at intake and outtake at the same moment. Plus the multimeter I currently use is of very poor quality and there seems to be something broken, so I have to always mess with the connector to actually register something.
The sound level meter is capable of registering frequencies from 31.5 Hz to 8.5 kHz. While this is very limited range, most of the devices in this price range use the same microprocessors so they are all about the same. Better devices start at ten times the price (at least) so this will have to do for the time being. The sound level range is 30–130 dBA with resolution of 0.1 dBA. The specified accuracy is 1.5 dBA. In the next few weeks I will also make a silent box to accomodate the measuring apparatus while suppressing ambient noise as much as possible and create measurements methodology.
And that’s not all! I should also be able to finally make the expansion module for my load tester to load units up to 750 W nominal. Not only it will give me more load on +12 V rail, but also much more precise control over how great steps of the load I can make! If all goes well, the first unit measured January will be a 750W one and it will also undergo noise measurements!
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