The Electro-Metrics ALR-30 is a passive loop antenna designed for magnetic field measurements within the frequency range of 9 kHz to 30 MHz. It is intended for electromagnetic interference (EMI) testing and signal analysis, particularly for radiated emissions. The ALR-30 is designed to be used with a 50-ohm receiver/analyzer, such as the Electro-Metrics EMC-30, and is calibrated to operate within a 50-ohm system.
**Technical Specifications**
* **Model:** ALR-30 (also referred to as ALR-30M)
* **Type:** Passive Magnetic Loop Antenna
* **Frequency Range (Calibrated):** 9 kHz to 30 MHz
* **Magnetic Field Measurement:** Sensitive only to the magnetic component (H-Field) of the electromagnetic field due to electrostatic shielding.
* **Input Impedance:** Matched to 50Ω
* **Connector Type:** TNC
* **Matching Networks:** Features ten passive matching circuits, selectable via a ten-position rotary switch, to optimize performance across the frequency range.
* **Calibration Signal Input:** Equipped with an “Injection In” connector (Type TNC) to allow an external calibration signal to be applied, as required by certain test standards.
* **Mounting:** Includes a 5/8-20 threaded receptacle on the base for mounting to a tripod, such as the Electro-Metrics Model TRI-136.
**Electrical Characteristics**
* The ALR-30 transforms magnetic field components using its internal matching circuits.
* Antenna factor charts are furnished with each antenna, which are necessary for converting receiver readings to field strength values, particularly for broadband signals.
* The antenna can be oriented for maximum sensitivity when perpendicular to the H-Field, with curves valid when oriented for maximum sensitivity in both azimuth and elevation.
**Mechanical Specifications**
* **Loop Diameter (Approximate):** 0.4 meter (17 inches)
* **Outside Diameter:** 432 mm (17 inches)
* **Height:** 508 mm (20 inches)
* **Weight:** 3.5 kg (7.5 lbs)
* **Construction:** Electrostatically shielded loop mounted on a rectangular base containing matching networks.
**Compatibility**
* Designed for use with 50-ohm receivers/analyzers, including the Electro-Metrics EMC-30 or equivalent.
* Can be used with the Electro-Metrics SU-30 Antenna Switching Unit for computer-controlled EMI test systems.
**Why Choose Aumictech for Electro-Metrics ALR-30?**
At Aumictech, we specialize in supplying high-end electromagnetic compatibility (EMC) testing equipment. Whether you need precise magnetic field measurements for EMI compliance, reliable signal analysis in the 9 kHz to 30 MHz range, or robust performance for laboratory and field applications, our team ensures the Electro-Metrics ALR-30 delivers maximum performance for your application.
