ELECTRO-METRICS
EM-6992
DESCRIPTIONAND USE OF ELECTRO-METRICS
MODEL EM-6992 NEAR FIELD PROBE SET
1.0 Description
The EM-6992 Near Field Probe Set is intended to serve as a
versatile aid for diagnostic testing
of
radiated emissions over
a broad range offrequencies from below 100 kHz to above 1
GHz. The probe setconsists ofthree (3) magnetic field probes,
two (2) electric field probes, 20 cm extension handle, and
custom carrying case. In addition,
an
optional EM-6990 broad-
band pre-amplifier is also available (Refer
to
Paragraph 4.0
for Description/Specifications).
The three magnetic field probes are electrically small (i.e.
resonant frequency above 1GHz) loops
of
varying sensitivi-
ties. The loops are wound within a balanced Faraday shield
that reduces their response to electric fields to a negligible
factor. Each successively largerloop increases sensitivity (in-
dependent offrequency) by approximately
12
to
15
dB. Probes
of reduced sensitivity may be of assistance in isolating an
emission source more precisely.
A ball probe and a stub probe comprise the two electric field
probes. Each probe responds primarily to the electric field
component and rejects the magnetic field component.
Type BNC (female) connectors are used as the output con-
nector on all the probes plus the probe extension handle.
(EM6992-1)
