Overview
Active, shielded Loop Antenna with nearly constant antenna factor over the entire frequency range (9 kHz - 30 MHz), battery driven to minimize disturbance influence from power line. Combined with a CISPR 16 EMI-receiver a convenient fieldstrength measuring system with low noise and pulse measuring capabilities is composed.
The FMZB 1519 can also be used with a spectrum analyser. The shielded aluminium housing is equipped with rubber feet for desktop operation or can be mounted to a tripod using the female camera thread (3/8") at the bottom. A protection circuit against deep discharge provides a long battery lifecycle. The battery must be recharged after an automatic switch off. A full battery charging period using the recommended charger takes around 5 hours.
The PWR-switch must be set to OFF during the recharging period, otherwise no charging takes place! The charging connector is disabled while the PWR switch is set to ON (normal measuring operation), this avoids disturbances generated by the charger having an unwanted influence on the measurement.
Applications
The Active Loop Antenna FMZB 1519 can be used for the frequency selective measurement of magnetic fields (of fictious electric field) in the longwave, midwave and shortwave frequency ranges. It can be used for testing according to CISPR, MIL, FCC, EN, ISO, ANSI, ETSI and many other standards.
Typical Frequency Response
Typical 1-dB-compression-point
Noise Floor
Displayed noise level of the FMZB 1519 in reference to field strength, measured with a CISPR 16-1-1 compliant measuring receiver.
The uncorrected voltage display of an EMI-receiver in dBµV was added with the antenna factor for fic. Efieldstrength (+20 dB/m) to obtain the field strength-related noise-floor of the system. The figures show the measured noise floor related to field strength for the FMZB 1519 at the FCLE 1535 receiver for different detectors and bandwidths.
Add the desired signal-to-noise-ratio to calculate the sensitivity of the antenna.
Noise Floor for Different Detectors and Bandwidths
| Specifications | |
| Nominal Frequency range | 9 kHz - 30 MHz |
| Connector female | 50 ? N |
| Antenna Factor for fict. E - fieldstrength | 20 dB/m |
| Antenna Factor for H - fieldstrength | -31.5 dB/?m |
| Loop Diameter | 0.5 m |
| Fieldstrength Measuring Range QP-Detector / 9 kHz IF-Bandwidth | 30-130 dBµV/m |
| Fieldstrength Measuring Range AV-Detector / 200 Hz IF-Bandwidth | 8-130 dBµV/m |
| Frequency Response | < +/- 1 dB |
| Operation time with full Battery Capacity | >20 h typ. 24 h |
| Battery | 12 V Pb 2.4 Ah |
| Recommended Charger | AL 300pro |
| Operation Indicator Green LED | > 10.2 V |
| Batt. Reserve Indicator LED red and green | 9.8 V - 10.2 V |
| Automatic Switch Off LED red (terminating) | < 9.8 V |
| Mounting Thread | 3/8" |
| Dimensions | 520 x 615 x 160 mm |
| Weight | 4.0 kg |
