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加拿大Madsen公司的ZS-77mB阻抗测试仪中的马达驱动和时基板主要有两个功能:1.控制加压泵的正转和反转。2 为记录仪X轴提供12秒的时基信号。现将该板的工作原理及修理校准情况简介如下: 一、工作原理开机后晶体管Q4、Q5处于截止状态,继电器RL1、RL2的线圈中没有电流流过,两个继电器均断开,驱动马达转动的交流24-V电压加不到马达的线包上,马达处于静止状态。当机器面板上的“+压”键按下后,接头“22-2”每地端“22-6”接通,IC3的7脚由原来的+7.8V左右降至+0.75V左右,IC3的6脚随之由原来的+7.8V左右降至0V左右,晶体管Q5由截止变为导通,继电器RL1
The Motor Drive and Timebase in the Madsen ZS-77mB Impedance Tester has two main functions: 1. Control the pump forward and reverse. 2 Provides a 12 second time base signal to the recorder’s X axis. The work principle of the board and the repair and calibration are summarized as follows: First, the working principle After switching on the transistor Q4, Q5 in the off state, the relay RL1, RL2 coil no current flow, the two relays are disconnected, the drive motor rotation The exchange of 24-V voltage less than the motor line package, the motor is at rest. When the “+” key on the panel of the machine is pressed down, “22-6” of each terminal “22-2” is turned on, and 7 feet of IC3 are dropped from the original + 7.8V to about + 0.75V, IC3 6 feet followed by the original +8.8 V down to 0V or so, the transistor Q5 from the end turned on, the relay RL1