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4.3 Test of a Single Pair
After setting the mode range and propagation velocity the measurement
can be started by pressing the START/STOP key. The measurement is
running repeatedly until a following START/STOP keystroke.
• In L1and L2 measuring modes the last waveform is displayed. To
save battery life, the measurement is automatically stopped after
one-minute elapsed time.
• In L1 LONG TIME and L2 LONG TIME modes all the obtained
waveforms are displayed together showing the intermittent faults.
In these modes there is no time out.
Balance Adjustment
Adjust the rotary BALANCE control to minimize the transmit pulse at the
start of waveform. (In the XTALK and L1-L2 modes, the balance control
is not effective.)
Gain Adjustment
Because of the attenuation of the cable under test, the amplitude of the
reflected pulse will decrease as the distance to the reflection location
increases. To obtain suitable reflected pulse amplitude, the gain should
be set as follows:
• Press the GAIN (F5) key
• Select the required gain with the ↑↓ keys
The gain can be adjusted between 0 and 90 dB in 6 dB steps
Setting Transmit Pulse Width (optional)
In case of high cable attenuation, a better reading may sometimes be
obtained by using a wider pulse. Therefore, if required, the pulse width
can be changed as follows:
• Press the PULSE (F6) key
• Select the required width by the ↑↓ keys
•
Storage of waveform
The displayed waveforms can be stored with key STO (F1)
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