16
200m / μs. The corresponding value should be entered according
to the actual type of cable. Otherwise, the result will be incorrect.
6. Transmit: Each time pressed, the instrument emits a pulse and
samples.
7. Display scale: Different measurement range corresponds to a
different display scale, that is, the sampling point, according to
different intervals displayed on the screen, the larger of range, the
larger interval, the greater the proportion of display, change the
display scale the waveform can be extended. Adjust the display
scale by pressing the decrease/increase key.
VIII. Instrument use fault test method
1. Fault type detect
Before the test cable fault, first determine the type of fault in order
to determine which test method to use. With the help of a
multi-meter or megger or other tools and on-site experience, you
can prejudge the type of failure.
If the fault type is open, short circuit, poorly contacted, or low
impedance grounded, use low voltage impulse method for
measurement. If it is high resistance fault, you should use high
voltage impulse method. If the fault type is not certain, you can use
the waveform comparison method.
2. Wave velocity calibration
When the measured cable velocity cannot be determined, it must
