| Injector |
| |
Measurement | Required? | Description | |
Attenuation | Yes | The Injector generates the frequencies and the Scanner | |
|
| measures the signal to determine the signal loss. | |
Autotest | Yes | The Injector is required for Attenuation, NEXT | |
|
| measurements, Resistance and Wire Map during Autotest. | |
Capacitance | No | If connected, the Injector provides an “OPEN” for the | |
|
| duration of the measurement. | |
Length | No | If connected, the injector provides an “OPEN” for the | |
|
| duration of the measurement. | |
Impedance | No | If connected, the injector provides an “OPEN” for the | |
|
| duration of the measurement. | |
NEXT - Scanner | Yes | The Injector provides a 100 ohm termination while the | |
End |
| Scanner measures NEXT. | |
NEXT - Injector | Yes | The Scanner provides a 100 ohm termination for the | |
End |
| duration of the measurement. | |
|
| ||
Injector only) |
|
| |
Loop Resistance | Yes | If connected, the Injector is used to “SHORT” the wire pair | |
|
| under test and the Scanner measures Loop Resistance. If the | |
|
| ||
|
| “OVR” (Over Range). | |
Wire Map (Find | Yes | The Scanner communicates with the Injector across the link | |
Cable Faults) |
| under test to determine the wire connection from the | |
|
| Scanner end to the Injector end. | |
Noise | No | The Injector is not required to measure impulse noise or | |
|
|
Note: The Injector is not used when testing coaxial cable. See Appendix D: Working with Coaxial Cable for more information.
Using Multiple Injectors
One Scanner can store calibration data for up to five Injectors. To determine which Injector is attached to the Scanner, press the Extended Functions key, then select Injector Info. The Scanner will display the serial number and other information for the attached Injector.
Injector Calibration
Calibration of the Injector’s signal amplitude is required for accurate Attenuation measurements and requires user intervention. To maintain accurate Attenuation measurements, the Injector must
