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2.1.2. Check whether the cable is disconnected / shorted
Test cable opens
█
1. Make a short the conductor and shield of the one side of the coax.
2. Take the testing probe and connect its cords to the specific ends of multimeter (red positive into the '+' marked jack
and black negative into the 'COM' jack) and Set the measurement type dial of the multimeter to Ω.
3. Touch one of the leads to the outer metal part of the BNC and the second to the center pin on the another side and
check the value.
4. If the value is significantly high such as Mega Ohm, it means the cable might be open.
5. If the value is lower than the expected loop resistance value, the cable might be shorted. (Normal loop resistance of
the cable in case of RG59 is about 8~10 Ω / 100 meter)
Test for shorted or open
█
1. Make both ends of the coax free by disconnecting it from the device
2. Take the testing probe and connect its cords to the specific ends of multimeter (red positive into the '+' marked
jack and black negative into the 'COM' jack) and Set the measurement type dial of the multimeter to continuity test.
3. Touch one of the leads to the outer metal part of the BNC and the second to the center pin. If you don't hear any
sound, then it means the coax is not shorted.
OFF
DCV
A COM VΩ
OFF
Ω
DCV
DCA
VΩ
A
COM
Pre-field verification — 9
OFF
DCA
A
COM
OFF
Ω
DCV
VΩ
A
COM
DCV
DCA
VΩ
DCA
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