Replacing the Battery
Replace the 9V battery when “Low Battery” appears on the display. Please switch off the unit before
opening the battery compartment. Remove the battery and carefully disconnect the contact-clip.
Plug the contact-clip onto the new battery and put it back into the compartment; then close the
compartment.
Warning
The unit is not approved for usage in explosive areas!
The usage in power plants is not allowed!
This unit cannot measure alternating fields > 1 Hz!
The Instrument must be grounded when high electrostatic charges are present.
Sparking on the modular system can cause damage to the unit and need to be avoided.
The EFM51 includes:
• Electro Field Meter EFM 51 including the 9V battery and 2 cm distance guides
• Storage Bag including grounding cable and clip
• User’s manual in German and English
• Calibration Certificate
Legend
Electrostatic Field Meter - EFM 51 V0805
Small hand-held Electrostatic Field Meter with digital display designed to measure electrostatic
charges and fields according to the field mill induction principle.
• The instrument measures the electrostatic voltage potential. A microcontroller calculates the field
strength (V/m) with the pre-selected distance (1cm, 5cm, 10cm and 20cm).
• In “E-Field meter” mode, the instrument displays the field strength in “kV/m”
Measurement Principle
The induced charge caused by the electrical field, generates a current proportional to the electrical field
strength. The selective, parametric operating-amplifier measures the current without affecting the
averaged time. There are no radioactive components inside the unit.
Technical Data
Dimensions: 70 x 122 x 26 mm ( B x L x H )
Weight: 130 g (without battery)
Power Supply: 9V – Alkaline battery IEC 6F22 or rechargeable NiMH battery
Measurement Range: distance 1 cm ÿ 0..... 8 kV max. resolution 1 V
Distance 2 cm ÿ 0..... 16 kV max. resolution 2 V
Distance 5 cm ÿ 0..... 40 kV max. resolution 10 V
Distance 10 cm ÿ 0... 80 kV max. resolution 10 V
Distance 20 cm ÿ 0... 160 kV max. resolution 20 V
E-Field meter ÿ 0… 800 kV/m max. resolution 0,1 kV/m
Display: 2 lines, 12 digits alphanumeric LCD display
Operating Time: app. 10 hours at continuous operation with an Alkaline battery
Adjustment: Within a plate capacitor’s homogeneous field,
plate size 200 mm x 200 mm, distance between both plates is 20 mm,
the rotating chopper system is centered in the grounded plate.
1. Rotating chopper
2. LCD – Display (2 x 12)
alphanumeric
3. Function/on key
4. Grounding Socket (4mm)
5. Battery compartment (back-side)
6. Zero adjustment trimmer
7. Protection cap
8. Distance guides
(removable for E-Field mode)
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