Kleinwächter EFM 113B User manual

Manual
Electro field meter EFM 113B
Small stationary static-field meter with high sensitivity to measure static DC-fields and
electrostatic charge according the field mill-influenz- rinci le.
Out ut: analogue current-signal ± 1mA
System Prof. Dr.-Ing. Hans Kleinwächter

2 Manual EFM 3B
Contents
General information of the principle of electrostatics ........................................................................................ 3
What is the result of electrostatic charge ................................................................................................................ 3
Description ........................................................................................................................................................................... 3
Technical Data ..................................................................................................................................................................... 4
Legend .................................................................................................................................................................................... 4
Operating instructions ..................................................................................................................................................... 5
Measurement method ................................................................................................................................................. 5
Field of application ....................................................................................................................................................... 5
Zero adjust ....................................................................................................................................................................... 5
Calculating the charge ................................................................................................................................................. 5
Pinning .................................................................................................................................................................................... 6
Optional accessories ......................................................................................................................................................... 6
Aluminum-clamp with thread .................................................................................................................................. 6
Table tripod ..................................................................................................................................................................... 6
Grounding.............................................................................................................................................................................. 7
Maintenance ......................................................................................................................................................................... 7
Warranty ................................................................................................................................................................................ 7
Warning - Instructions ..................................................................................................................................................... 7
Parts of delivery .................................................................................................................................................................. 7
Calibration............................................................................................................................................................................. 8
Cable assignment ............................................................................................................................................................... 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 there 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 has to 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 electronic is an interference resistant ±1mA current-interface.
The maximal cable-length (0,14qmm) is 50m.

4 Manual EFM 3B
Technical Data
Dimension (L x B x H): a . D36mm x 120mm
Weight: a . 180g
Calibration in a plate capacitor: 200mm x 200mm, Distance 25mm
Ranges: 5kV/m, 20kV/m, 50kV/m und 200kV/m
Tolerance: < 5%
ower supply: 9-15V DC / ca. 60mA
Operating-time : By 8 hours a day min. 2 years
Interface: Analogue ±1mA Current Interface (Ri< 2kΩ)
Warranty: 24 months
Legend
1 nickel-plated housing pipe
2 Modulator system
3 connector 5 pins
4 Zero Adjust

5 Operating instructions
Operating instructions
Measurement method
The static-field meter has 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 checking of the electrostatic Field and Charges, and measuring electric and
electrostatic charges and extreme highly resistive voltage su lies.
Before Measure remove the red cap on the modulator system
Zero adjust
First ut on the red ca on the modulator system. Then select the 5kV/m range.
Adjust zero (0mA) with the otentiometer trough the hole on the back side.
After changing the range adjust zero again.
Calculating the charge
The measured field-strength (E) is calculated by measurement-range multi lying with the
out ut-current in mA.
To calculate the charge (V) multi ly the field strength (E) with the distance (A).
Example: Range (R) 50 kV/m output-current (I): 0,4mA
E = R x I = 50kV/m x 0,4 = 20kV/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 = 20.000 V/m x 0,05 m = 1000 V

6 Manual EFM 3B
inning
Pin 1 = Range select B
Pin 2 = Power su ly + 9-15V DC
Pin 3 = Ground (GND)
Pin 4 = Range select A
Pin 5 = Current out ut ±1mA
The maximum cable length (0,14 mm²) is 50m.
Range selection
Pin 1(4) o en = H
Pin 1(4) connect to ground = L
Optional accessories
Aluminum-clamp with thread
Aluminum-clamp with thread
To mount the measuring head on each position
Table tripod
Small table tri od for the aluminum clam .
Pin 1(B) Pin 4(A) Range
L L 5 kV/m
L H 20 kV/m
H L 50 kV/m
H H 200 kV/m

7 Grounding
Grounding
The a liance must be grounded to get real measuring results.
You can connect ground by the access line ( in3) or over the o tional aluminum clam
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 o ening the housing you lose the warranty.
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 has to 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.
arts of delivery
•Electro field meter
•shield cap
•access line 3m
•Manual
•Calibration certification

8 Manual EFM 3B
Calibration
We recommend a new calibration every year.
Cable assignment
(Standard cable)
Pin color Function
1 white Range select B
2 brown Power supply + 9-15V DC
3 black Ground (GND)
4 blue Range select A
5 grey Output current ± 1mA
© Kleinwaechter GmbH 20