Hameg Instruments HM5011 Serviceanleitung Seite 18

Specifications
Frequency
Frequency range: 0.1MHz to 1000MHz
(lower frequency limit
depends on probe type)
Output impedance: 50 Ω
Output connector: BNC-jack
Input capacitance: 2pF
(high imped. probe)
Max. Input Level: +10dBm
(without destruction)
1dB-compression point: -2dBm
(frequency range dependent)
DC-input voltage: 20V max.
Supply Voltage: 6V DC
4 AA size batteries
Supply-power of HM5010/5011
Near Field Sniffer Probes HZ 530
The HZ530 is the ideal toolkit for the
investigation of RF electromagnetic
fields. It is indispensable for EMI pre-
compliance testing during product
development, prior to third party testing.
The set includes 3 hand-held probes
with a built-in pre-amplifier covering the
frequency range from 100kHz to over 1000
MHz.
The probes - one magnetic field probe,
one electric field probe, and one high
impedance probe - are all matched to the
50Ω inputs of spectrum analyzers or RF-
receivers. The power can be supplied
either from batteries, Ni-Cads or through a
power cord directly connected to an
HM5010/HM5011 series
analyzer.
Signal feed is via a 1.5m BNC-cable.
When used in conjuction with a spectrum
analyzer or a measuring receiver, the
probes can be used to locate and qualify
EMI sources, as well as evaluate EMC
problems at the breadboard
prototype level. They enable the user to
evaluate radiated fields and perform shield
effectiveness comparisons. Mechanical
screening performance and immunity tests
on cables and components are easily
performed.
The H-Field Near-Field Probe
The H-Field probe provides a voltage to
Frequency Response E-Field Probe (typical)
Subject to change without notice
Supply Current:
Probe Dimensions: 40x19x195mm (WxDxL)
Housing:
Package contents: Carrying case
(Batteries or Ni-Cads are not included)
the connected measurement system which
is proportional to the magnetic radio
frequency (RF) field strength existing at the
probe location. With this probe, circuit RF
sources may be localized in close proximity
of each other. The H-field will decrease as
the cube of the distance from the source. A
doubling of the distance will reduce the H-
field by a factor of eight (H = 1/d³); where d
is the distance.
In the actual use of the H-field sensor one
observes therefore a rapid increase of the
probe's output voltage as the interference
source is approached. While investigating a
circuit board, the sources are immediately
obvious. It is easily noticed which component
spectrum (i.e. IC) causes interference and which does
not. In addition, by use of a spectrum analyzer,
the maximum amplitude as a function of
frequency is easily identified. Therefore, one
can eliminate early in the development com-
ponents which are not suitable for EMC
purposes. The effectiveness of countermeas-
and ures can be judged easily. One can inves-
tigate shields for "leaking" areas and cables
or wires for conducted interference.
The High-Impedance Probe
The high-impedance probe (Hi-Z) permits
the determination of the radio frequency
interference (RFI) on individual contacts or
printed circuit traces. It is a direct-contact
probe. The probe is of very high impedance
Frequency Response H-Field Probe (typical)
EMC-MEASUREMENT EQUIPMENT
8mA (H-Field Probe)
15mA (E-FieldProbe)
24mA(High imp.Probe)
Plastic; (electrically
shielded internally)
1 H-Field Probe
1 E-Field Probe
1 High Impedance Probe
1 BNC cable (1.5m)
1 Power Supply Cable
(near the insulation resistance of the printed
circuit material) and is loading the test point
with only 2 pF (80Ω at 1 GHz). Thereby one
can measure directly in a circuit without
significantly influencing the relationships in
the circuit with the probe.
One can, for example, measure the quan-
titative effectiveness of filters or other
blocking measures. Individual pins of ICs can
be identified as RFI sources. On printed
circuit boards, individual problem tracks can
be identified. With this Hi-Z probe individual
test points of a circuit can be connected to
the 50Ω impedance of a spectrum analyzer.
The E-Field Monopole Probe
The E-field monopole probe has the
highest sensitivity of the three probes. It is
sensitive enough to be used as an antenna
for radio or TV reception. With this probe the
entire radiation from a circuit or an equipment
can be measured.
It is used, for example, to determine the
effectiveness of shielding measures. With
this probe, the entire effectiveness of filters
can be measured by measuring the RFI which
is conducted along cables that leave the
equipment and may influence the total
radiation. In addition, the E-field probe may
be used to perform relative measurements
for certification tests. This makes it possible
to apply remedial suppression measures so
that any re-qualification results will be positi-
Subject to change without notice
ve. In addition, pre-testing for certification
tests may be performed so that no surprises
are encountered during the certification tests.
Frequency Response High Impedance Probe
(typical)
17