• Handheld magnetic field meter
• 150 kHz - 400 MHz
• Picture Shown short Version

The well-known H-Field-Probes of the FMZBSeries and the direct reading HMDA 1545 cover the frequency range 9 kHz - 30 MHz (80 MHz).

Using a smaller loop and a new loop amplifier with ten times faster transistors, the upper frequency limit was extended to 400 MHz.

So this probe permits the frequency selective measurement of the very low limits for medical implants.

Application

A typical application is frequency selective HField-Measurement outside and inside of buildings and rooms using test receivers or spectrum analyzers.

The wide frequency and dynamic range covers the limits of human protection beginning at approximately 4.5 MHz as well as the very low limits for medical implants (heart pacemaker). Field sources are AM and FM radio- and TV stations. Furthermore, there is a variety of military and civilian radio services, not to forget CB- and amateur radio. The antenna (conversion) factor is constant over nearly the complete frequency range giving a very natural field-strength image when spectrum-analyzers are in use.

In order to eliminate power supply problems and stray coupling, NiMH rechargeable batteries are built in the mounting tube. The state of the battery is monitored by two LEDs. After more than ten hours of continuous operation, charging with the automatic charger takes about 2-4 hours.

The probe contains 6 NiMH-cells with 1.2 V/1000 mAh each resulting in a the voltage of 7.2 V (nom.). The batteries are built in the antenna tube and completely shielded. Any stray coupling or other effects from outside are impossible. The 10 hours of operation time is very conservative considering the current consumption of only 30 mA.

Option:

ACS 410:  ACS 410 charger for HFS 1546