Test analysis: (1) Reading method of varactor box: Multiply the number corresponding to "△" by the following multiple, and then add them to get the connected resistance value. The resistance value of the varistor box is 2×1000Ω+2×100Ω+2×10Ω = 2000Ω, and its varistor range is 0-999Ω;
(2) Reading method of ammeter: first look at the selected range, then look at the corresponding dividing value, and finally read according to the position of the pointer. If the range of 0~0.6A is selected, the graduation value is 0.02A and the reading is 0.22A；; If the range of 0~3A is selected, the graduation value is 0. 1A and the reading is1.1a;
(3) Reading method of the electric energy meter: read it in turn according to the displayed readings. Note that the last digit is a decimal, and the unit is degrees (kW·h). The reading of the electric energy meter in the figure is 1362.5 degrees, which is determined by "3000r/kW? H "shows the circuit consumption connected to this watt-hour meter 1kW? H, the watt-hour meter turns to 3000 rpm, and the watt-hour meter turns to 3000 rpm, and the power consumption is just 1 kwh. ：