EFS-10, 100, 300, 500 – Frankonia Group

Radiated Immunity

Field Strength Meter

The Frankonia EFS field strength meters especially have been designed for field strength measurements / field homogeneity measurements during radiated immunity tests according to IEC/EN 61000-4-3 / -20. But it could also be used to measure the radiation exposure of the environment, for example at workplaces or flats.

The EFS is an isotropic miniature E-field sensor to ensure that the E-field will not be influenced by the size of the sensor itself. It even does not need any metering unit (which could also influence the field strength), because of its direct fibre optic output which allows direct connection of the sensor to the USB-interface of the control PC or laptop. The measuring values may be displayed via the individual IEC/EN 61000-4-3 / -20 control software or via a Windows software included in the delivery.

The EFS-10 / EFS-100 cover the frequency range from 10 kHz up to 9.25 GHz and are able to detect electrical field strength in the range from 0.14 V/m to 500 V/m (depending on type).

The sensors are battery operated by Li-Mn batteries, which allow a maximum operation time of 100 hours before recharging.

Features

Extreme small size

PC connection via fibre optic link

Excellent isotropy (0.3 dB typical)

Frequency range: 10 kHz to 26,5 GHz

Field strength measurements from 0.14 V/m to 500 V/m

Up to 100 hours operating time before recharging

Technical specifications	EFS-10	EFS-100
Frequency range	10 kHz-9.25Ghz	100 kHz – 9.25 GHz
Flatness
With frequency correction OFF	0.1 Mhz-150 MHz: 0.4 dB 0.05 MHz-6000 MHz: 1.6 dB 0.03 MHz-7500 MHz: 3.2 dB	1 Mhz-150 MHz: 0.8 dB 0.5 MHz-6000 MHz: 1.6 dB 0.3 MHz-7500 MHz: 3.2 dB
With frequency correction ON	0.05 MHz-7500MHz: 0.4 dB	0.3 MHz – 7500 MHz: 0.4 dB
Dynamic range (single range)	0.5-500 V/m (60 dB)	0.14 – 140 V/m (60 dB)

Resolution	0.01 V/m
Sensors	6 monopoles
	0.5 dB (0.3 dB typical) (@50 MHz)
Overload	1000 V/m	300 V/m
Measured data X-Y-Z axis	sampling simultaneous on X-Y-Z axis
Sampling rate	22 S/s to 0.03 S/s, depending on filter setting
Digital filter	Low-pass 2.3 Hz to 28 Hz; 80 dB notch 50/60 Hz
Internal battery	3V-5mAh, rechargeable Li-Mn
Operation time	100 hours @ 0.4 S/s, 28 Hz filter
Recharging time	48 for full operation time, Partial charging allowed, e.g.: 8 hrs rech. = 12 hrs operation @ 5 S/s 1 hr rech. = 5 hrs operation @ 0.4 S/s
Internal data memory	serial number, calibration date, calibration factors, firmware version
Communication	bidirectional fiber optic link
Fibre optic connector	HFBR-0500
Fibre optic length	10 m standard (20/40 m) optional
Fibre optic to PC connection	fibre optic to RS232 converter, RS232 to USB converter
PC Software	Displays field, temperature, battery, sampling, filters, averaging, frequency setting, manual data logging as text file
Operating temperature	-10 °C ÷ +50 °C
Temperature reading	0.1 °C resolution
Battery voltage reading	10 mV resolution
Dimensions	53 mm overall, (body: 17 mm diameter, sensor: 17 mm)
Weight	25 g, including 1 m fibre optic pigtail
Probe holder tip	1/4 20 UNC female
Included accessories	10 m fibre optic cable, optical/RS232 adapter + RS232/USB adapter, software, battery charger
Optional accessories	20 m fibre optic cable, order-no.: EFS-OF20 40 m fibre optic cable, order-no.: EFS-OF40

The EFS-300 / EFS-500 cover the frequency range from 300 kHz up to 18 GHz and are able to detect electrical field strength in the range from 0.17 V/m to 800 V/m (depending on type).