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故障现象：“心电”的标准电压正常，“血流”的标准电压打不出来。故障分析：该仪器是上海医电厂的产品，属于心电图机和血流图机组合仪器，除做血流图外还可做心电图用。该机定标电压是由定标电路发生方波信号，然后分别供给血流放大和心电放大部分。用联接插板将定标电路板?
Symptoms: The “ECG” standard voltage is normal and the “blood flow” standard voltage is not available. Fault analysis: The instrument is a product of Shanghai Medical Power Plant, which belongs to the combination instrument of electrocardiogram machine and blood flow map machine. It can also be used for electrocardiogram in addition to blood flow mapping. The machine calibration voltage is generated by the calibration circuit square wave signal, and then provide the blood flow amplification and ECG amplification. Use a connector board to calibrate the circuit board?