Warranty
We provide12 months limited warranty.
The warranty does not include the battery, mechanical damage or unauthorized opening of the
instrument.
Operating instructions
Operation
•
Press the „function/on“ key “shortly” to switch on the instrument
•
Press the key twice while in measuring mode to switch off the instrument
•
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-Mode app. 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 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 => 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 range is preset 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
ÿ
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 unit 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!