Scope: HANTEK DSO-6074BC (www.hantek.ru)
CH1 (yellow) - current measurement at L, HANTEK CC-65 BNC 1mV/10mA
CH2 (blue) - Voltage measured at L, relative to EARTH (PE), T3100 1:100,
CH3 (purple) - Voltage measured at N, relative to EARTH (PE), T3100 1:100
RED - MATH - differential measurements or else.
The device is heater fan. At first it just blows without heating, introducing fully inductive load. So, there is a phase shift of current relative to voltage. Also, MATH channel shows POWER (U*I). Then heater is turned on and since the fan power is negligible relative to the heater power the phase shift is hardly visible.
7 апр 2019