HZ530 Near Field Sniffer Probes



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 50£[ 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 HM5010/5011/5012/5014 series spectrum 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 and 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 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/d?; 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 (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 components which are not suitable for EMC purposes. The effectiveness of countermeasures can be judged easily. One can investigate 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 (near the insulation resistance of the printed circuit material) and is loading the test point with only 2 pF (80£[ 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 quantitative 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 50£[ 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 verified 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 positive. In addition, pre-testing for certification tests may be performed so that no surprises are encountered during the certification tests.

Frequency Response
E-Field Probe (typical)
Frequency Response
H-Field Probe (typical)
Frequency Response
High Impedance Probe (typical)


Frequency range 0.1MHz to 1000MHz (lower frequency limit depends on probe type)
Output impedance 50 £[
Output connector BNC
Input capacitance 2pF (high impedance probe)
Max. Safe Input Level +10dBm
1dB-compression point: -2dBm (frequency range dependent)
DC-input voltage 20V max
Supply Voltage 6V DC; 4 AA size batteries; Supply power of HM5010/11/12/14
Supply Current 8mA (H-Field Probe); 15mA (E-Field Probe); 24mA (High Impedance Probe)
Probe Dimensions 40x19x195mm (WxDxL)
Housing Plastic (electrically shielded internally)
Package contents

Carrying case, 1 H-Field Probe, 1 E-Field Probe, 1 High Impedance Probe

1 BNC cable (1.5m), 1 Power Supply Cable, Operators Manual

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