User`s manual EFM 51 - Transforming Technologies
Contents
1. Operation e Press the function on key shortly to switch on the instrument e Press the key twice while in measuring mode to switch off the instrument e Remove the protection cap before a measurement e The unit will switch off automatically when the function on key was not pressed for app 4 minutes in CPS Mode app 18 min Hold Function The hold function freezes the display with the actual measured value e Press the function on key shortly while in measuring mode for hold e Press the key while in hold to return to measuring mode Measuring Ranges 1 Measurement of electrostatic voltages The instrument is preset to 2cm distance after switching on To measure it must be positioned at 2 cm distance in front of the object For high voltages or uneven surfaces the measuring distance should be increased 2 E Field meter mode The instrument indicates the field strength in V m for the current position Measuring Distance Measuring mode Press and hold the function on key approximately 2 seconds until change cm will appear The pre selected distance in cm is displayed in the first line Pressing the function on key changes the measuring distance 2cm gt 5cm gt 10cm gt 20cm gt E Field meter gt CPS Mode gt 1cm After selecting the desired distance or mode the instrument switches back to measuring mode if no key is pressed for a certain time Important The measuring range is pres2. 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 gt 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 e Electro Field Meter EFM 51 including the 9V battery and 2 cm distance guides e Storage Bag including grounding cable and clip e User s manual in German and English e Calibration Certificate Rotating chopper LCD Display 2 x 12 alphanumeric Electrostatic Field Mater _ Function on key a _ Grounding Socket 4mm Battery compartment back side Zero adjustment trimmer ems m ra Protection cap BA es Distance guides removable for E Field mode E EFM 5 Electrostatic Field Meter EFM 51 vo805 Small hand held Electrostatic Field Meter with digital display designed to measure electrostatic charges and fields according to the field mill induction principle e The instrument measures the electrostatic voltage potential A microcontroller calculates t
3. et to 2cm distance each time the instrument is switched on The instrument measures the field strength in V m and calculates the voltage using the selected range Display value V Field strength V m x Distance m i e Display value 1000V Distance 10cm 1000V 10000 V m x 0 1m In E Field meter mode the instrument displays the field strength in kV m Distance guides The instrument is supplied with two 2cm distance guides which are fitted on the front plate The alphanumeric Liquid Crystal Display LCD consists of 2 lines of 12 digits each The measured distance in cm or the measuring mode is displayed in the first line while the test result is displayed in the second line An overflow indication requires to increase the distance Battery control The EFM 51 has a permanent battery voltage control If the battery voltage falls below 7 5 V a Low Battery warning appears and the 9V Battery must be replaced In case the battery falls below 7 0 V the instrument switches off with auto off message to avoid total discharge and acid leakage Note Please use Alkaline or Lithium 9V Batteries only If rechargeable batteries are preferred please use a suitable battery charger for charging the battery separately and follow the manufacturer s instructions Grounding The unit must be connected to ground to allow accurate voltage levels and polarity measurements Use the grounding socket 4 for ground connection The u
4. he field strength V m with the pre selected distance 1cm 5cm 10cm and 20cm e 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 x26mm BxLxH Weight 130 g without battery Power Supply 9V Alkaline battery IEC 6F22 or rechargeable NiMH battery Measurement Range distance 1cm gt Oren 8 kV max resolution 1 V Distance 2cm gt 0 16 kV max resolution 2 V Distance 5cm gt 0 40 kV max resolution 10 V Distance 10 cm gt 0 80 kV max resolution 10 V Distance 20 cm gt 0 160 kV max resolution 20 V E Field meter gt 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 Warranty We provide12 months limited warranty The warranty does not include the battery mechanical damage or unauthorized opening of the instrument Operating instructions
5. nit housing is conductive and the instrument may be grounded through the operator if he is at ground potential Zero Adjust in general zero adjustment is not necessary However the trimmer 6 can be used for zero adjust if the instrument does not indicate U 000 or U 00X when the rotating chopper is shielded by the protection cap The last digit can be ignored as it is much lower than the specified tolerance Maintenance It is very important not to touch any parts of the rotating chopper The sensor head must be free of dust and humidity If needed the rotating chopper be cleaned with alcohol and a lint free tissue when switched off Deforming the rotating chopper will damage the instrument
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