Maybe someone can explain to me what the problem is:
2 different function generators tested, JDS6600 and FeelTech FY6600. Identical settings, identical results.
For example: 4kHz square wave with 2.0Vpp. Measured Vac with the 121GW and as comparison a Fluke 28II (highres mode).
Range AUTO: 121GW selects 5V range, Fluke selects 6V range
121GW reads 1.37xxVac, Fluke reads 0.99xxVac
Manual range 5V 121GW, 6V Fluke 28II:
121GW reads 1.37xxVac, Fluke reads 0.99xxVac
Manual range 50V 121GW, 60V Fluke 28II:
121GW reads 0.95xVac, Fluke reads 0.94xxVac
Similar behavior for the 121GW with sine wave. It reads 1,117xV in auto range and manual 5V range and 0,664V in manual 50V range. I checked with 200Hz sine and same behavior for the 121GW, Fluke and Brymen 235 work fine.
What is the 121GW doing in auto range / 5V range?
And Bluetooth:
Still the same for me. It's more or less luck if I get a connection to the meter. Tried both apps. When I get a connection with Dave2-App I only get something displayed in the lower half of the display, the upper half stays completely blank for me on my Samsung Galaxy S8.