Identifying transformer windings and voltages

Identifying transformer windings and voltages
In this video we sort our the windings and votages from an unknown AC power transformer. this transformer has 3 secondary voltages (windings) but there are no instructions or chart to sort them out. So we do it with a multimeter and a variac.

5 boards for about $22 in about 7 days
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Here is all the gear I currently use:
Oscilloscope 1: Rigol 1054Z
Oscilloscope 2: Siglent SDS1202X-E
Power Supply 1: TekPower TP3005N
Power Supply 2: RUIDENG DP50V5A
Signal Generator: JS2800
DMM1: Owon18B
DMM2: Aneng 8008
DMM3: Aneng 8009
DMM4: Uni-T UT801
Soldering Station1: Zeny (Yihua)862D+
Soldering Station2: KSGR T12
Light Meter Smart Sensor AS803

power transformer,hkc31,kk c31,hkg31,hk g31,