Fnirsi SG-004A signaalgenerator

In general a good little device but seems to be having accuracy issues perhaps depending on the production batch. It barely hits 0.02% (more like 0.1% to 0.05%) accuracy, and that only when you calibrate all the ranges (18/12/6 for V) and also for I. And then let it run for +5hrs and then it will settle to around 0.02%. Battery runtime is extremely long. Now after such long time then switch it off and then on again and you will see that your former settling in stability is gone and you start a new a new period of warm up. I did long term logging with Keithley with +300.000 log points and you can nicely see the saw tooth type regulation over t. But do not dare to press a button and you have a new set of max & min. spikes. Lots of possibilities for sure, dim display. Interesting device. However, I returned it and ordered the smaller brother the SG-003A as this one can also be custom calibrated. I loose the last digit and some accuracy. But if you really need 0.02% (and a stable simulation output) then better buy a professional one. That of course not for 150EUR but like 5 to 10x times more at least. Casing has good quality.