| Title |
A Study on the Improvement of Test and Diagnosis Device for Audio Frequency Track Circuit |
| Authors |
Jang-Kyu Kim ; Jae-Chul Kim |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2010.24.12.147 |
| Keywords |
Jointless Audio Frequency track circuit ; TTM(TI21 Test Meter) ; AD-TTM(Advanced TI21 Test Meter) |
| Abstract |
We studied on performance improvement of TTM(TI21 Test Meter) that is test and diagnosis devices for jointless audio frequency track circuit on Korean electric railway TI21 standard. Upgraded devices is AD-TTM(Advanced TI21 Test Meter). This can measure alternating frequency USB(Upper signal band) and LSB(Lower signal band). In the audio frequency track circuit, ±17[㎐] of nominal frequency are demodulated and supplied to track relay through AND gate. It is important that measurement function which is error between USB and LSB. Need of AD-TTM will stand out in the electric railway system because this is simple and accurate rather than the former device. |