© 2016 DESCO INDUSTRIES, INC.
Employee Owned
To shut off the Static Sensor 718, momentarily press
down on the membrane switch labeled POWER.
Determining that the power is off can be verified by
seeing that the liquid-crystal display (LCD) is off.
Making Electrostatic Voltage Measurements: hold
the instrument 1-inch (2.54 cm) away from the object
being measured. The display will update with the voltage
measurement in kilovolts. If the measured voltage is
greater than the measurement range of the instrument,
a -1. Will be displayed. At this time, switch to a greater
range. If over-ranging occurs even with the high range
activated, the static charge on the object cannot be
measured with the Static Sensor 718.
Figure 3. Using 718 Static Sensor to take measurements.
Measurement Range: all measurements are in kilovolts
(kV) as stated on the front label of the unit. The Static
Sensor 718 has two measurement ranges: 0 to ±1.999
kV and 0 to ±19.99 kV. The unit’s current measurement
range mode can be verified by checking the display.
Three digits following the decimal point indicate that the
unit is in 0 to ±1.999 kV range. Two digits following the
decimal point indicate that the sensor is in 0 to ±19.99
kV range. To change between measurement ranges,
press the RANGE/HOLD button once, momentarily.
HOLD Function: in the event that the user wishes to
freeze the current measurement, the HOLD function of
the Static Sensor 718 may be used. Simply press the
HOLD switch momentarily and the currently displayed
voltage will be frozen. A HOLD notice will also be
displayed to alert the user that the instrument is currently
in HOLD status. To unfreeze the display and return to
floating measurement, momentarily press the HOLD
switch once again.
Note: During HOLD condition the distance indicating
LED’s are turned off.
Zero Adjustment: the SCS Static Sensor 718 has a
zero adjustment function, which sets a zero reference
point for all subsequent measurements. This zero
reference can be set by pointing the instrument at a
known zero-voltage surface, and holding down the
RANGE/ZERO button for longer than 3 seconds. After
3 seconds, the display will flash and adjust to zero.
Repeat this step for both the low and the high ranges.
The zero adjustment should be performed every time the
unit is turned on.
Measurement Accuracy: Distance Indicator: the
Static Sensor 718 is factory calibrated to give accurate
measurements when it is placed one inch (2.54 cm)
away from the object to be measured. To assist the
user in gauging this distance, two light-emitting diodes
(LED’s) are present on the front face of the instrument.
These LED’s emit two red, bull’s-eye targets on the
surface of the object being measured. As the instrument
gets closer to the one inch measurement distance, the
bull’s-eyes begin to converge. When they converge
and become one, the instrument is approximately one
inch away, and the measurement can be made. For
more accurate measurements, it is recommended that
the user manually measure the distance between the
front housing of the instrument and the object being
measured.
Accuracy and Size of Object to be Measured: the
minimum surface area on an electrostatically charged
object which can be accurately measured is a 5 square
inch (32.3 cm2) area.
Measurements from Greater than One Inch (2.54 cm)
Away: in the event that a one inch separation between
object-to-be measured and the Static Sensor 718 cannot
be achieved, it is possible to get approximate readings.
Continuous Output: an output jack is provided on
Figure 5. 718 Static Sensor has a continuos output range.
the front of the SCS Static Sensor 718. This output
can be used to feed a continuous signal into a data
storage device for continuous monitoring of measured
voltages. Please use a 3/32 inch (2.5 mm) mono-phone
plug to connect into the output jack. The output signal
is dependent on the measurement range currently
selected. For the low range, the output signal is 1/1000
of the measured electrostatic voltage. For the high
range, the output signal is 1/10,000 of the measured
voltage.
Figure 4. 718 Static Sensor showing hold function and
floating measurement function. SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
