Warmbier Germany, Electrostatic Field Meter EFM51
Warmbier P/N: 7100.EFM51
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Use anywhere to check personnel ESD grounding quickly
Checks contact resistance between Wrist Strap and skin
Power Supply: 9V Battery Grounding Wire: 2.5 meter
Simply touch circular surface on Tester with your hand and
connect ground wire. In case of a safe ground, LED will be
'Green'. Opposite Table summarizes test indications.
Power Low (Red)
< 750 KΩ
OFF
Good (Green)
750KΩ ~ 10MΩ
ON
High (Red)
>10MΩ
OFF
LED Indication Resistance Buzzer
Operation
Grounding Wire
of Wrist Strap Tester
Grounding Wire
of Wrist Strap
Wrist Strap
Wrist Strap Tester
Inde P/N: ISM-498
Warmbier ESD Field Meter, Wrist Strap Tester
ESD Safe
reliable & caring since 1976
While the information contained herein in, has been carefully compiled to the best of our knowledge, nothing is intended as representation and warranty on our part; and no statement shall be construed as recommendation to infringe any of existing
patents. We accept no liability of whatsoever for any faults and errors in the information contained herein. Contents of this catalogue and specifications of the products, are subject to change without notice due to continuous improvements.
shown trademarks are property of their respective owners.
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Cell: 09316134502 Fax: 0172-4640415
Email: headoffice@indeonline.in
• Handheld, portable, digital electrostatic field meter with rotating chopper
• Detects and accurately measures electrostatic fields
• Measures: fields, potentials and discharge time
• Automatic field to voltage conversion according to selected distance
• Very stable zero adjust
Supplied with:
9V battery
Grounding cable
Carrying bag
User Manual
Calibration certificate
Distance: Range: Max. resolution
1 cm 0 - 8 kV 1 volt
2 cm 0 - 16 kV 2 volts
5 cm 0 - 40 kV 10 volts
10 cm 0 - 80 kV 10 volts
20 cm 0 - 160 kV 20 volts
E-Field mode 0 - 800 kV/m 100V/m
CPS mode
1.000 to 100 volts
0,1 sec.
Technical data:
• Power supply: 9V battery IEC6F22
or rechargeable battery
• Range: 0 - 160 kV / 0 - 800 kV/m
• Display: 2 row LCD-display
• Dimension: 70 x 122 x 26 mm (W x L x H)
• Weight: 130 g (without battery)
Replacingthe Battery
Replace the 9V batterywhen“Low Battery” appears on thedisplay.Please switch off the unit before
openingthe batterycompartment.Removethebatteryandcarefullydisconnect the contact-clip.
Plug the contact-clip ontothenew batteryand put it back into the comp artment; then closethe
compartment.
Warning
The unit is not approved for usage in explosive areas!
The usage inpowerplants is not allowed!
This unitcannot measure alternating fields > 1 Hz!
The Instrumentmust be grounde dwhenhigh electrostatic chargesare present.
Sparking on themodularsystem can causedamageto the unit andneed to be avoided.
The EFM51 includes:
• Electro Field MeterEFM 51 including the 9V batteryand2 cm distance guides
• Storage Bag includinggrounding cable and clip
• User’s manualin 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.
• Theinstrument measures the electrostatic voltage potential. A microcontroller calculates the field
strength (V/m) with the pre-selecteddistance (1cm, 5cm, 10cmand 20cm).
• In “E-Fieldmeter” mode, the instrumentdisplays the fieldstrength in “kV/m”
Measurement Principle
The induced chargecaused by the electricalfield, generates a current proportionalto the electrical field
strength. Theselective,parametric operating-amplifier measures the currentwithout affecting the
averaged time. There are no radioactive components inside the unit.
Technical Data
Dimensions: 70 x122 x 26 mm ( Bx L xH )
Weight: 130 g(without battery)
Power Supply: 9V – Alkalinebattery IEC 6F22 or rechargeable NiMH ba ttery
Measurement Range: distance 1 cm ÿ 0..... 8kV max.resolution1 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... 80kV max.resolution10 V
Distance 20 cm ÿ 0... 160 kV max.resolution20 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 aplatecapacitor’s homogeneousfield,
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/onkey
4. GroundingSocket (4mm)
5. Battery compartment (back-side)
6. Zero adjustmenttrimmer
7. Protection cap
8. Distanceguides
(removable for E-Field mode)
Warranty
Weprovide12 months limited warranty.
The warranty does no tinclude the battery, mechanical dama georunauthorizedopeningof the
instrument.
Operating instructions
Operation
• Press the „function/on“key“shortly” to switch onthe instrument
• Press thekeytwice while in measuring mode to switch off theinstrument
• Remove the protection cap before a measurement
• The unit will switch off automatically when the „function/on“ key was not pressed for app. 4 minutes
(in CPS-Modeapp.18 min.)
Hold Function
The hold-function freezes the display with the actual measured value.
• Press the „function/on“ key “shortly” while in measuring mode for “hold”.
• Press the key while in “hold” to return to measuring mode.
Measuring Ranges
1. Measurement of electrostatic voltages:
The instrumentis preset to2cm distance afterswitching on.To measure, it must be positioned a t2
cm distancein front of the object. Forhigh voltages or uneven surfacesthe measuring distance
should be increased.
2. E-Field meter mode
The instrumentindicates the fieldstrength in V/m for thecurrent position.
Measuring Distance / Measuring mode
Press a ndholdthe „function/on“-ke y(approximately 2 seconds)until „changecm“ will appear. Thepreselected distance in cm is displayedin the first line. Pressing the „function/on“-keychangesthe
measuring distance.
2cm => 5cm => 10cm => 20cm =>E-Field meter => CPS-Mode => 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 rangeis preset to2cm distance each timethe 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 ÿ 1000V = 10000V/m x 0,1m
In “E-Fieldmeter” mode the instrumentdisplays the fieldstrength in “kV/m”.
Distance guides
The instrumentis supplied withtwo 2cm distanceguides which arefitted on thefront plate.
The alphanumeric Liquid Crystal Display (LCD) consists of 2 linesof 12 digits each. Themeasured
distance in cm or the measuring modeis displayed in thefirst line,whilethe test result is displayed in the
second line. An„overflow!“ indicationrequires to increa sethedistance.
Battery control
The EFM 51has a permanent battery-voltage-control. If thebatteryvoltage falls below7,5 V a
„Low Battery“ warning appears andthe 9V Batte rymust be replaced!
In case thebatteryfalls below 7,0 V theinstrument switches off with „auto off“message to avoid total
discharge and acid leakage.
Note: Pleaseuse Alkaline or Lithium 9V Batteries only!
If rechargeable batteries are preferred, please use a suitabl ebattery charger forcharging the battery
separatelyandfollow the manufacturer’s instructions.
Grounding
The unit must be conne ctedtoground to allow accuratevoltage levels and pola ritymeasurements. Use
the grounding socket(4) for ground connection. The unit housing is conductive, and the instrument may
be grounded through theoperator 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 notindicate U=000 o rU=00X when the rota tingchopper is shieldedbythe protection
cap. The last digit canbe ignored, as itis muchlower 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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