ETS-Lindgren 94606-6 Current Probe - Manual (Page 38)

38 | Assembly and Installation
T O E VALUATE S HIELDING E FFECTIVENESS
When placed over shielding conduit, coaxial cable, or ignition shielding, the
probe measures the current flowing on the external surface of the shield.
Installation Instructions
The window (aperture) of the probe will accommodate cables up to the
following maximum outside diameters.
Current Probe Maximum Outside Diameter
Model 91197 Series 1.25 inches
Model 91550 Series 1.25 inches
Model 93511 Series 1.25 inches
Model 94106 Series 1.25 inches
Model 94111 Series 1.25 inches
Model 94430 Series 0.75 inches
Model 93686 Series 2.62 inches
Model 94606 Series 5.0 inches
For greatest accuracy, the conductor under measurement should be
centered in the window of the current probe.
Place the probe around the conductor(s) to be measured and then carefully lock
the probe jaws. Otherwise, inadequate shielding or incorrect air gap will result
and the measurement will not be accurate.
The connecting cable used between the current probe and the EMI test
equipment must have 50-ohm characteristic impedance and matching cable
connectors. The current probe is calibrated for use only with a 50-ohm load.
Therefore, the EMI test equipment must have a 50-ohm input impedance.
Observe precautions regarding minimum bending radius when installing and
using the cable. For long cables and at high frequencies, cable loss may also be
a factor. Use low loss cables and perform cable loss corrections if necessary.