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Bending or moving the phase unstable cable while making a
measurement may cause errors in the measurement. The test
cable used for port extension must be phase stable in the
measurement frequencies.
At the successful completion of each calibration step, a message
is displayed with a beep sound.
4.2.4
DTF Measurement
If a port extension cable is used to interconnect the instrument with the line,
measurement error can happen due to the sum of the port extension cable
length and the distance to the fault. By performing the O-S-L calibration at
the end of the port extension cable, the extension cable length will be
compensated and the fault location can be more accurately measurable.
The maximum allowable input level of the
instrument is +25dBm. Do not connect the RF
In port directly to the system output port.
Exposure to the overpowered input may
degrade the performance of the instrument
and may cause damage in the long run.
Do not connect the instrument to the antenna
when there is a risk of lightning. Electric shock
may cause the malfunction or breakdown of
the instrument.
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