Kleinwächter EFM 115 User manual

Manual
Elektrofeldmeter EFM 115
Small E - Field meter with high sensitivity to measure static DC-fields and electrostatic
charge according the field mill-influenz-principle
with USB – nterface to connect to a PC etc.

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Contents
General information of the principle of electrostatics ........................................................................................ 3
What is the result of electrostatic charge ................................................................................................................ 3
Description ........................................................................................................................................................................... 3
Technical Data ................................................................................................................................................................ 4
Legende ............................................................................................................................................................................. 4
Operating instructions ..................................................................................................................................................... 4
Measurement method ................................................................................................................................................. 4
Field of application ....................................................................................................................................................... 4
Zero adjust ....................................................................................................................................................................... 5
Calibration............................................................................................................................................................................. 5
Connection ............................................................................................................................................................................ 5
Calculating the electric / electrostatic charge ................................................................................................... 5
Voltage measuring with the voltage head MK11 ............................................................................................. 6
EFM115_ReadOut............................................................................................................................................................... 6
nstallation ....................................................................................................................................................................... 6
Grounding.............................................................................................................................................................................. 7
Maintenance ......................................................................................................................................................................... 7
Warranty ................................................................................................................................................................................ 7
Warning - nstructions ..................................................................................................................................................... 7
Parts of delivery .................................................................................................................................................................. 8
Optional accessories ......................................................................................................................................................... 8

3 General information of the principle of electrostatics
General information of the principle of electrostatics
Electrostatic discharging is a today problem on many working places with the use of modern
micro-electronics as e.g. Microchips and their sensibility against it.
There is also a very strong danger for industrial branches as e.g. Telecommunication-, Plastics-, and
manufactures of explosives.
The loss in manufacturing time as well as high financial damage and the affection of the
health of persons may be caused by ESD (electrostatic dischargement).
It is possible that electrical charges of over 10.000 V can build up on human clothes,
materials, and equipment.
Damage on electronic components may already occur with a charge of less as 100 V and
charges of 3.000 V are able to flash and may be the result of explosion in hazardous areas.
What is the result of electrostatic charge
Trough friction and separation of different materials the so called - Tribo Electricity - (it stays for the
Greek word tribeia which means friction) will be generated.
The reason is a transfer of electrons between the two materials.
Since the charge of electrons is negative the material depleting electrons has a positive charge,
compare the material enhances electrons shows a negative charge.
There are different ways to prevent or divert electrical charges. However, to find a useful and
effective way, first the source and the charge of the electrostatic field should be located and
polarity and strength measured.
To do so as well as check any chosen steps against electrostatic charge or to control desire
charge our Electro-Field meter is recommended.
Description
The modulator-system with the complete electronic is integrated in a metal tube-housing.
The metal–tube is connected to ground.
The influenz–measure-electrode is in shape of a star. In front of this electrode rotates a
ground-connected modulation-vane-wheel with the same shape. These parts are hard-gold-
plated to prevent galvanic distortions. An influenz-electrode covers the ring-electrode-system
for mechanical protection.
At the back-side there is a balanced-potentiometer to adjust the offset.
The signal-output to the PC etc. occurs about a Mini - USB – Interface connector.
The USB also powers the unit – Interface.

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Technical Data
Dimension (L x B x H): app. D36mm x 120mm
Weight: app. 180g
Calibration in a plate capacitor: 200mm x 200mm, Distance 25mm
Ranges: 5kV/m, 20kV/m, 50kV/m und 200kV/m
Tolerance: < 5%
Power suppl : 5V max 100mA by USB nterface
Connect to Ground bay a 4mm socket
Operating-time: By 8 hours a day min. 2 years
Interface: Mini – USB - nterface
Warrant : 24 months
Legende
Operating instructions
Measurement method
The E-field meter is a parametric amplifier. The electrical field causes an alternated current
proportional to the field strength. These current can be measured with a selective amplifier,
without taking away energy of the electrical field.
Through using gold-plated influenz-electrodes no galvanic disturbances are induced.
There is no radioactive material in use!
Field of application
Detection and Control of the electrostatic Field and measuring electric or electrostatic charges and
extreme highly resistive voltage supplies.
Before Measure remove the red cap on the modulator system!
1 nickel-plated Housing pipe
2 Modulator system
3 USB Mini nterface
4 Zero Adjust
5 Erdungsbuchse 4mm
6 M6 Threat socket for table tripot

5 Calibration
ero adjust
First put on the red cap onto the modulator system. Then press in the EFM115_Read ut
Software the “Zero Adjust” button.
If an error message appears, you should make a Zero adjust by the potentiometer (4) on
back of the unit. Adjust the measure value < 50mV and press the “ok” button at the
software.
After it start a new “Zero Adjust” until “Zero adjust o.k. appears.
Then disconnect the red cap from the modulator system.
Calibration
We recommend a new calibration every year.
Connection
Use to connect the USB – nterface a standard USB cable with “Mini-USB” plug
Calculating the electric / electrostatic charge
To calculate the charge (V) multiply the field strength (E) with the distance (A).
Example: Measured Field strength (E) = 50 kV/m
Object-distance ==> field plate of the static-field meter = 5 cm (0,05m)
Charge [V] = field strength [E] * distance [A] (in meter)
U = E x A = 50.000 V/m x 0,05 m = 2500 V
By EFM115_ReadOut Software you can select the distance (in cm).
The Software converts measured field strength (E) by the distance to charge (V).

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Voltage measuring with the voltage head MK11
By the optional voltage head MK11 you can measure charges up to 2.500 V with an internal
resistance of Ri >> 10
15
Ohm
By high voltage measurements the directives of the standard EN 10100 are be followed.
For using the MK1 mount it on the modulator system of the EFM 115. At the voltage
head MK11 there is a PTFE isolate field plate in 1cm arranged.
By this you get the following voltage range:
•±50 V
•±250 V
•±500 V
•±2,5 kV (maximaler Messwert)
Select in the EFM115_ReadOut Software the option „Voltmeter “!
The resulted linear volt meter has the following excellent qualities:
Input capacit ca. 5pF
Input resitance >10
16
Ω by clean head
EFM115_ReadOut
With the provided software EFM115_Read ut the EFM 115 can be pursued directly in a PC
etc. with „windows“ operating system.
The USB interface powered the EFM 115.
The USB - interface protocol can be downloaded from our home page under support:
http://www.kleinwaechtergmbh.de
Installation
-Put the CD in a free disk drive
-for 32Bit – Systems start EFM115_setup_x86.exe
-for 64Bit – Systems start EFM115_setup_x64.exe
-following the installation instructions
Connect EFM 115!
The drivers for the unit is in root: c:\drivers !
Start Software EFM_read_out.exe!

7 Grounding
Grounding
The appliance must be grounded to get real measuring results.
You can connect ground by the 4mm socket on the back.
Maintenance
Don´t touch the modulator system!
Time by time the modulator-system needs to be cleaned and a new offset – adjustment with
shielded field-plate is necessary. For cleaning use a lint-free cotton cloth.
Caution! Absolute avoid a deformation of the modulator.
Warranty
By normal use conform to this manual we give you a warranty of 24 moth.
By opening the housing, you lose the warranty.
Damages by hard high voltage estimates, wrong grounding and mechanical damages are
excused from the guarantee,
Warning - Instructions
•This measuring - head is not for measuring in explosive-areas!
•The usage in power-installations is not allowed!
•With this unit, it is not possible to measure alternated fields > 1 Hz.
•The static-field meter must be grounded every time.
•The first measurement must be made in a sufficient distance, so that the maximal
possible surface-potential is detected in a safe distance.
•Sparkle-discharge to the modulator-system can destroy the electronic and is to avoid
absolutely.

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Parts of delivery
The following parts belong to basic equipment:
•Electro – Field - Meter EFM 115
•shield cap
•USB – cable with Mini plug 1,5m
•Spiral ground cable 2 m with alligator clip
•CD with EFM115_ReadOut Software
•Table tripod
•ESD – case with foam
•Manual
•Calibration certification
Optional accessories
Voltage measuring head MK11 mit Banana socket (see picture)
©2017 Kleinwächter GmbH