19
78-8136-3182-3
4. Depress the on/off button to activate the 3M
™
Charge Analyzer 711. The display will briefly indicate
RECEIVED DATA WAIT
.
5. The display will next indicate
EXTERN EFM, A<OFF & ON>B
. Depress the “B” button (ON) to activate
the 3M
™
Remote Field Sensor Probe. Selecting the “A” button (OFF) will deactivate the sensor and return
the Charge Analyzer to an internal measurement mode.
6. When ON is selected the display will indicate
EXT. EFM, D = CM, A<CHANGE, & OK>B
. Select the
desired measurement distance by depressing the “A” button (CHANGE) momentarily until desired distance is
displayed.
Note: This value represents the distance in centimeters between a charged surface and the sensor head.
7. Depress the “B” button (OK) to select. The display will briefly indicate
PARAMETER CHANGED
when
distance value is changed.
8. The display now indicates external field mode, distance, and measured voltage. To change the distance
setting again while in the external field mode, depress the “B” button momentarily and repeat steps 5-7.
9. With red cover on probe, zero the remote field sensor by inserting a small probe or tool into the hole located at
the rear of the sensor. At the bottom of the hole there is a membrane switch. Momentarily apply light pressure
to activate the zeroing feature. The analyzer display will briefly indicate
ZERO ADJUSTMENT
.
Note: When changing to a lower distance setting, re-zeroing is recommended. For higher distances it is not
necessary to re-zero.
This completes the remote field sensor probe setup & zeroing.
Use
1. Remove the red cover from the remote field sensor probe.
2. Position the sensor in front of the charged surface or object to be measured.
Important Note
•
When measuring an unknown voltage on a surface, position the probe at a far distance away and approach
the surface slowly to prevent accidental discharges to the sensor element. If there is a suspected high
charge or if the surface of the object is uneven, the measuring distance should be increased.
3. Observe the measured voltage (U = Volts or Kilovolts) on the analyzer display.
Note: The remote field sensor probe measures the electrical field in V/m. The electrical field is measured
automatically based on the set measurement distance and is then internally calculated and indicated
as volts in the displayed U = V.
Example 1: If the distance between the object and sensor equals 2.5 cm and the “U” value indicates
500 volts, then the strength of the electric field is in this case 500V/inch (Since 1 inch = 2.5 cm
approximately).
To change the measurement into V/m, multiply the indicated U = V value displayed by the appropriate
factor to obtain 100 cm, (1 m) length.
Example 2: If the distance between the object and the sensor equals 10 cm and the “U” value
indicates 500 volts, using chart below, then the V/m is in this case 5000 volts.
Distance (cm)
Factor
1
100
2,5
40
5
20
10
10
20
5
To convert readings into volts/inch or volts/cm use the following two formulas:
R/100 x D (cm) or R/39.4 x D (in.) where:
R = Reading indicated on the analyzer display. D = Distance between object and sensor electrode, measured in
inches or centimeters.
The charge analyzer 711 is now ready to perform measurements through the remote field sensor probe.
