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Using Test Mode
Use Test Mode to calculate the length of unterminated cables. A termina-
tion with impedance closely matching the characteristic impedance of
the cable can produce inaccurate test results. One of the following error
messages may appear in the LCD display screen:
▪ "Short" icon appears demonstrating the cable is terminated.
▪ "Error" message blinks to indicate that SSTDR reflection was
not detected due to a properly terminated cable or excess
signal loss.
When Test Mode is in use, the connected cable is tested for
the presence of voltage. If detected, a dynamic voltage warning
displays until the unit is disconnected from the voltage source.
1. Connect a cable to the Snap Shot™. Use connection accessories
according to the type of cable you are testing.
Note: Connection to the cable should be as short as possible to
minimize the impedance discontinuity at the cable attachment
point. Otherwise, The Snap Shot™ may see a fault at the
connection point.
2. Press the POWER button to turn the unit ON.
3. Select the memory storage location (M1 or M2) with the desired
NVP value for testing. The NVP value requires adjustment if neither
storage location contains an NVP value matching the type of cable
you are testing.
Note: Refer to the Using Memory Storage section for instructions
on adjusting NVP values.
A listing of common NVPs by cable type is on the backside
of the Snap Shot™. You may also refer to Appendix A for an
extended list of NVP values.
4. Press the TEST button. The LCD display screen shows the following
upon entering Test Mode (See Figure 8):
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