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Ring Detect VAC / VDC when on-hook *
1.
Make the connections between the Test circuit and the LT51 as in Fig. 3.1.
2.
Turn the LT51 ON. [after Reset: Ztx = 600, Zrtx = HiZ 600, TX Source =
OFF, TX Freq =10 kHz, Mode = TX-RX (4W)]
Press the [f2] soft-key to select the 'Voltage DC/AC' measurement.
3.
4.
The DC voltage of the line is displayed.
5.
Apply ring signal to the RTXab terminals of the LT51.
6.
You will hear an audible tone indicating the presence of the ring signal.
When the ring signal is present, the AC (rms) voltage of the signal is
displayed.
*Ring voltage cannot be measured when the protection voltage is 60V. See
specifications.
LT51 User Manual
Testing VF-PCM Multiplexers
17
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