| 摘要 |
PURPOSE:To perform test without complication and troubles, by performing relay control and so on through the level exchange circuit of electromagnetic electronic by a computer in the tester where outgoing and incoming lines of the exchange unit are connected to perform test of the exchange unit. CONSTITUTION:In case that A and B lines of the tester are made into a loop, relay L1 supervises the current in the B A line direction to confirm the operation state of the tested exchange unit, and relay L2 confirms the current in the A B line direction. Meanwhile, relays TS, TR;PS, PM;MFS, MFR and MD perform connection of transmission and receiving circuits TSD and TRE, transmission and receiving circuit MFSD and MFRE of multifrequency signals, and MODEM (MO) and transmit and receive various AC signals. Control and so on of these relays are performed through level converting circuit LVC of electromagnetic electronic and I/O control circuit I/D of test information by computer CPU. As a result, test without complication and troubles is possible. |
