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Field Strength Meters

Precision Test Systems supplies three types of field strength meters / analyzers.  Also a matching range of field signal generators are available to complement the FSM series to provide a complete propagation measurement system.

FSM Series of Field Strength Meters

The FSM series of field strength meters will measure the strength of a RF signal appearing at its input from +20 dBm to -110 dBm for wide bandwidth models and +10 dBm to -120 dBm for narrow bandwidth models. The RF strength will be displayed on an LCD display to an accuracy of ±3 dB over the entire 130 dB dynamic range. A matching field signal generator is also available to act as a signal source for propagation studies.

Many models to choose from covering  the 20 MHz to 3 GHz frequency range
  • 130 dB dynamic range. Measures from +20 dBm to -110 dBm or +10 dBm to  -120 dBm depending upon what bandwidth is chosen
  • Frequency range and step size can be altered to customer's requirements upon special request
  • Handheld portable units operating on rechargeable batteries. Typically five hours use between charges
  • Fast log detector enables GSM or digital signals to be captured as well as normal CW signals


The FSM series of field strength meters are ideal for the following applications:

  • Propagation study or mapping of radio systems including analog and digital systems.
  • Measurement of antenna performance of a cellular phone or two way radio.
  • Direction finding using a directional antenna.

Three modes of operation, namely CW, PULSE or MAX-HOLD enables the FSM series to measure normal analog CW signals as well as pulse signals such as encountered in GSM cellular systems or avionics systems. The FSM series log amplifier has a fast response enabling short bursts of signals to be captured and displayed to an accuracy of ±3 dB.















Frequency Accuracy

Level measurement Range (Wide Bandwidth Models)

Level measurement Range (Narrow Bandwidth)

Level Measurement Resolution

Level Measurement Accuracy

Measurement bandwidth (FSM100 to FSM 500)

Measurement bandwidth (FSM900)

Measurement bandwidth (All other models)

Selectivity (FSM100 to FSM900)

Selectivity (FSM960)

Selectivity (All other models)

Display Type

Battery Life




Operating Temperature Range

20 MHz to 100 MHz in 12.5 kHz steps

100 MHz to 200 MHz in 12.5 kHz steps

200 MHz to 300 MHz in 12.5 kHz steps

300 MHz to 400 MHz in 12.5 kHz steps

400 MHz to 500 MHz in 12.5 kHz steps

800 MHz to 900 MHz in 5 kHz steps

890 MHz to 960 MHz in 100 kHz steps

1750 MHz to 1850 MHz in 12.5 kHz steps

1710 MHz to 2170 MHz in 100 kHz steps

2100 MHz to 2200 MHz in 12.5 kHz steps

2200 MHz to 2300 MHz in 12.5 kHz steps

2300 MHz to 2400 MHz in 12.5 kHz steps

2400 MHz to 2500 MHz in 12.5 kHz steps

± 3 ppm @ 23ºC

+20 dBm to -110 dBm

+10 dBm to -120 dBm

0.1 db

± 3 dB

± 3.75 kHz

±15 kHz

To be advised

40 dB @ ± 25 kHz

40 dB @ ± 200 kHz

To be advised

Touch Sensitive color screen display

Five hours after full charge

115 VAC or 230 VAC ± 10%

127 mm x 85 mm x 25 mm

0.36 kg

+10 ºC to + 40 ºC