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你好，应严格按照以下步骤，是否有turn on 10V的bias？另外建议可以更换29910做一下交叉测试
Power Factor and Efficiency Measurement Procedure
1. Check the switch S1 at ON position. If S1 is not at ON position, switch S1 to the position ON.
2. Turn on the ventilation fan and keep the fan in operation during the time of test.
3. Set the AC source voltage to 115 VAC and frequency to 60 Hz. But keep the AC source powered off
4. Prior to connecting the AC source, set the current to 2.5-A peak and 2.5-A limit. Connecting AC source
to LINE and NEUTRAL terminals as shown in Figure 2.
5. Connect voltmeter V1 across the J3 as shown in Figure 2.
6. Connect ammeter A1 to J3 positive terminal and connect ammeter A1 to Load-1. Then connect Load-1
negative terminal to J3 negative terminal.
7. Connect 10-V Bias to J1, turn on 10-V Bias.
8. Set Load-1 to constant current mode to sink 0.2 ADC and set Load-1 at 100 VDC input range before
turning on the AC source.
9. Turn on the AC source.
10. Varying the load current from 0.2 A to 1.2 A, along with the load current variation:
(a) Read input voltage, input real power, and power factor from the AC source.
(b) Read output voltage and output current from V1 and A1.
11. Turn off the AC source.
12. Set the AC source voltage to 230 VAC and frequency to 50 Hz.
13. Repeat step 8 and 10
