产生双通道信号源以输出所测量的信号和干扰信号。测得的信号为正弦波（测试点为端），有效值为10mV~1000 mV，频率范围为10Hz～10kHz。干扰信号（测试点B端）可以选择输出的正弦信号和方波信号，正弦信号的幅度10mv ~ 100mV的频率范围为10Hz ~ 10khz；方波的频率为50Hz，振幅为100mV；(A dual channel signal source is produced to output the measured signals and interference signals. The measured signal is sine wave (the test point is A end), the effective value is 10mV~1000mV, and the frequency range is 10Hz~10kHz. The interference signal (test point is B terminal) can select the output sinusoidal signal or square wave signal, the range of the sinusoidal signal is 10mV~100mV and the frequency range is 10Hz~10kHz; the frequency of the square wave is 50Hz and the amplitude is 100mV;)