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DZ—751型48道磁带地震仪是在DZ—701的基础上扩充记录道数发展起来的。由于它能大大提高工作效率,故颇受野外队的欢迎。其记录流程同701型,结构上的主要特点是有四个“公控”抽屉。每个“公控”控制12道放大器,起始控制量可根据各道能量大小加以调节。由此会带来一定的人为误差影响,主要是由“公控”引起的放大器“桥”衰减电路的相位失真。当“桥控”电压不同时,“桥”内阻发生变化,从而引起信号相位超前量不等,以至超出了误差要求范围。
DZ-751 type 48 tape seismograph is based on the DZ-701 to expand the number of tracks developed. Because it can greatly improve work efficiency, it is popular with the wild team. The recording process with the 701 type, the main structural features are four “public control” drawer. Each “public control” control 12 amplifiers, the initial control volume can be adjusted according to the size of each channel energy. This will bring some human error, mainly due to “public prosecution” caused by the amplifier “bridge” attenuation circuit phase distortion. When the “bridge” voltage is not the same, the “bridge” internal resistance changes, causing the signal phase lead amount ranging from, even beyond the error requirements.