SN388地震电缆数传测试器研制

Development of SN388 seismic cable tester

利用多级移位寄存器构成m序列伪随机信号发生器 ,产生伪随机数字信号 ,作为测试信号源 ,将信号通过接口电路转换为RS -4 85信号 ,使之与SN3 88地震电缆中传送的信号相仿 ,送入测试电缆中传输 ,然后将电缆发送端和接收端的信号进行位对位的比较 ,获得测试电缆的传输误码数 ,以此来判断地震电缆的数传性能的好坏。使用证明该测试器可有效检测SN3 88地震电缆的数传性能。

The tester of SN388 seismic cable uses multi-shift-register forming a m-sequence generator to generate pseudo random digital signal,which is used as a signal source of the tester. The signal transforms into RS-485 signal through interface circuit,which makes the signal is similar to the acquisition signal in SN388 cable,then passes through the test cable. The transmission missing code is obtained by bit to bit comparison of signals from transmitting port and receiving port,and the result can show the transmission capability of SN388 seismic cable. The practice proves the tester is effective.