NOYAFA NF-268 - Manual (Page 8)

Your excellent helper in cable test! 5
3.5 Check breakage location of non-energized wires (as below)
Connect a broken wires with the two clips, push the key to “scan”,
Keep the probe close to wire, it means normal if “beep” emits. Then
move the probe along the wire, the point is breakage when no “beep”
comes out.
Note:
1) clip one core with red clamp, keep the black one free.
2)turn the volume to degree 6-8 when tracing cable.
3)Clip one core to tested.
3.6 Network cable mapping
3.6.1) If the tested cable is in good connection, No.1-8 &G leds will
be on and blink in circulation.
3.6.2) If No. 2 & No.3 cables are broken, the No.2 led of emitter and
receiver won’t be on. The others blink normally.
3.6.3) If No. 2 & No.3 cables are shorted, the No.2 & 3 Leds of receiver
won’t be.
No.1-8 leds of emitter works normally.