Installation, Equipment setup, Archived 6/1/10 – ETS-Lindgren 94456 Current Probe (Archived) User Manual

Page 9

MODEL 94456 CURRENT PROBES

Installation

REV B – PN 399265

INSTALLATION

This section describes methods for setting up the current

probe and associated measuring equipment. Operating

procedures are contained in the Operation section.

EQUIPMENT SETUP

In measuring the RF current in a single conductor, the

probe jaws are placed around the conductor so that the

conductor passes through the center opening and then the

jaws are locked together. In the case of a two-conductor

cable, the probe can be used to evaluate the common mode

component of the noise current (the net effect of the

currents leaving and returning) by placing the probe over

both conductors at the same time, or the interference

current in either conductor can be measured separately by

placing the probe over each wire individually.

In a more complex case of multi-conductor cables, the

probe will measure the net external effects of all the

currents in the conductors that pass through the center of

the probe.

When placed over shielding conduit, coaxial cable, or

ignition shielding, the probe measures the current flowing

on the external surface of the shield. The probe can thus be

used to evaluate the shielding effectiveness.

NOTE: Standing waves can exist on the test conductor

under test at or near its resonant frequency. Under these

Archived 6/1/10