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7 Static charge measurements
7.1 Summary
The measuring accuracy depends on the size of the area to be measured. The FMX-004 has
been calibrated for 0
– 30 kV for a flat measuring area of 150 mm x 150 mm and a measuring
distance of 25 mm. Incorrect values will be displayed when measurements are conducted from
a different distance or on a smaller area.
7.2 Measurement
1 Switch the instrument on (press [POWER] button once) when sensor and distance LED's
face an uncharged object.
2 Zero the measuring instrument when the reading is not zero.
3 Hold the measuring instrument 25 mm away from the area t
4
Press the button [HOLD]
(the measured value is retained).
5 Read the measured value.
be measured.
6 If the measuring instrument is in the HOLD mode: Switch HOLD off to measure again.
The buzzer will continuously emit an alarm signal and the graphic display will flash at a
measurement value >33 kV.
+
Hint:
-
For measuring values above 30 kV, keep the instrument at a distance of 80 mm. In that
case, multiply the reading by a factor of 2. Then the maximum measured value
is 60 kV.
Warning:
Attempts to measure too high a charge may damage the sensor.
7.3 Reading the display
The measured values are shown digitally and graphically on the display. The polarity is shown
by [+] or [-]. Graphically [-] negative is shown in blue and [+] positive in red.
−
Measurement values < ±1,49 kV (LO range) are shown with an accuracy of 2 decimals.
−
Measurement values 0 - ±30 V (HI range) are shown with an accuracy of 1 decimal.
−
Measurement values between 1 and 1,5 kV in AUTO mode are within the hysteresis range
and are shown with an accuracy of 1 or 2 decimals, depending on the AUTO LO or AUTO HI
measuring range.
−
The measurement value is shown without decimal during ion balance measurements.
