AH Systems is a US based manufacturer of EMC test equipment, antennas and probes. The EMC Shop stocks AH Systems test equipment for rental or sale.
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AH Systems manufacturers a good quality, broaband current probe for monitoring RF and conducted immunity setups during compliance testing. The EMC Shop can help integrate the AH Systems broandband current probes with field intensity meters, spectrum analyzers, and other 50 ohm impedance instruments to measure quantitative magnitudes of current. The EMC Shop stocks most of these RF broadband current probes for rental or sale.
A.H. Systems offers 16 models of portable antenna kits. Each kit provides all the reliable antennas, current probes and accessories needed to satisfy a wide array of customer requirements. Each component has a specific storage compartment in the carrying case therefore, loss and breakage are virtually eliminated. Cables, a tripod with azimuth and elevation head and a tripod carrying case accompany each antenna kit. Click on a model below to learn more about it's characteristics and included antennas.
AH Systems Current Probes are devices used in a wide variety of industrial and scientific applications, and designed to be used in the process of generating and measuring high levels of RF current. Conducted currents can be measured without making direct contact with the source conductor or metallic surface by means of clamp-on broadband current probes. These EMC Current Probes are designed to permit field intensity meters, spectrum analyzers, and other 50 ohm impedance instruments to measure quantitative magnitudes of current. Measurements can be made on single and multi-conductor cables, ground and bonding straps, shielded conduits and on coaxial cables.
For many years most standards called for the use of a half-wave dipole antenna set for frequencies above 80 MHz. However, to reduce test time, broadband antennas such as the biconical antenna and log periodic antennas began to be accepted. Broadband antennas, compared to half wave dipoles, reduce test time because the technician did not have to stop the test to adjust the dipole antenna for each frequency. A.H. Systems' 7 models of Biconical Antennas operate efficiently over the frequency range of 20 MHz to 18 GHz. Suitable for FCC, MIL-STD, VDE, TEMPEST, and immunity testing, each Biconical antenna will provide reliable, repeatable measurements.
For rapid deployment along with the mobility of small package, AH Systems Bilogical Antenna Kits provides an inexpensive solution to broadband applications. Each Bilogical Antenna Kit comes with a Folding Bilogical Antenna, tripod extension rod, cable, screwdriver and a rugged carrying case with an optional preamplifier cutout. Suitable for FCC, MIL-STD, VDE, TEMPEST, and immunity testing, each Bilogical antenna will provide reliable, repeatable measurements. The ability to sweep in one trace makes the Bilogical antenna a versatile performer.
These half wavelength resonant dipole antennas are the foundation of every compliance testing lab. Initial designed by Willmar K. Roberts, these precision made half wavelength dipole antennas are the ideal solution for site attenuation measurements. Each antenna is manufactured with a balun loss of less than 0.5 dB and a VSWR of less than 1.5:1 The half wavelength resonant dipole antenna is the simplest antenna from a theoretical point of view, and are commonly used as a gain reference.
A.H. Systems' Preamplifier line is an excellent choice with a rugged design, no hassles with soldering your own power leads and they improve overall system sensitivity by at least 20 dB. All of A.H. Systems' Preamplifiers come with a 12-volt (or 15-volt) DC regulated power source. A low voltage indicator confidently allows you to power the amplifier with your own external 12-volt DC battery. This makes it a convenient choice for field measurements. See table below for amplifier specifications.
A.H. Systems manufactures a wide variety of EMI loop antennas in the frequency range of 20 Hz to 30 MHz. Loop antennas are primarily used to measure the magnetic field strength at lower frequencies. The small size of these loop antennas has the advantage of convenience in handling, availability of a zero- response orientation, and a simple expression for the voltage produced by a given field strength. At higher frequencies, about above 100 MHz, a loop of practical size may no longer be electrically small and has a significant response to the electric field as well as the magnetic field.
Whether used in a set to measure shielding effectiveness per MIL-STD 285 and NSA 65-6 or individually to satisfy specific requirements, the Loop Antenna is an efficient, low cost solution.
Broadband EMC horn antennas, compared to half wave dipoles, reduce test time because the EMC technician did not have to stop the test to adjust the dipole antenna for each frequency. Most compliance standards now require the use of such antennas. The latest version of Mil-Std 461G states the used of broadband double ridge guide horn antenna as the antenna of choice for frequencies above 200 MHz.
Log periodic antennas are our specialty here at A.H. Systems, and on this page you will find a great selection of log periodic antennas, ranging from standard frequency coverage to broadband and folding antennas. These antennas are excellent for shielding effectiveness, site-survey, pre-compliance testing, or full compliance applications.
