3
718 Static Sensor
Instruction Manual
Safety Information
Intended Use
The 3M™ 718 Static Sensor is a portable, handheld instrument designed for measuring voltages associated with electrostatic charge. Its intended use is for measuring the amount of voltage, in a range from 0-20 kilovolts, associated with an electrostatic charge buildup on a surface. Any deviation from this intended use could impair the instrument’s effectiveness and possibly lead to an unsafe operating condition.
The 3M™ 718A Air Ionizer Test Kit is a set of accessories for use in conjunction with the 3M 718 Static Sensor. Their
intended use is for verifying the operation of air ionizers by measuring the neutralization time for a static charge placed on a stationary metal plate. Any deviation
from this intended use could impair the instrument’s effectiveness and possibly lead to an unsafe operating condition.
Caution Statements
•The 718 Static Sensor and 718A Charger use DC 9V power supplied by a 9V alkaline battery. Usage of any other power source may cause damage to the instruments.
•The 718 Static Sensor and 718A Air Ionizer Test Kit have no user-serviceable parts. Do not disassemble the products for
any reason. UNAUTHORIZED SERVICE WILL VOID THE WARRANTY.
•The 718 and 718A are NOT designed for usage in hazardous environments where the possibility of explosion or fire exists.
Read and understand all safety information before installing and operating this equipment.
1.0 Description
The 3M™ 718 Static Sensor is a portable handheld instrument used for locating and measuring electrostatic charges. It can be used to locate ESD trouble-areas, and is a valuable tool for the ESD-control engineer. Used in conjunction with the 3M™ 718A Air Ionizer Test Kit (available separately), it can be used for verification and auditing of air ionizers.
The 718 Static Sensor is battery-powered and has several measurement features: Range: measurements can be taken in a 0- 2 kV or 0-20 kV range.
Automatic Zero: pushbutton feature allows easy adjustment to zero. No screws or dials to turn.
HOLD function: allows the User to "freeze" a displayed measurement, for later evaluation.
Automatic shutoff: conserves battery power by shutting off the instrument after 20 minutes of inactivity.
2.0Power Requirements and Battery Installation
2.1Both the 718 and 718A Charger us DC 9V power supplied by a 9V alkaline battery.
2.2To install the battery on either unit:
2.2.1Remove the battery cover, located in the lower back of the unit. To do this, press down on the cover and slide it downward.
2.2.2Pull the battery connector out of the housing, and align the male/female ends of the connector with the proper terminals on the battery.
2.2.3Connect the two, and place the connected battery into the housing by inserting the connector end first, then following up with the other end of the battery.
2.2.4Replace the cover.
2.3The 718 Static Sensor has a Low Battery indicator. Once the battery is depleted to approximately 6.5 volts, the instrument will show BAT in the display. At this time, the 718 will not produce accurate results and the battery should be replaced. A fresh alkaline battery should last greater than 50 hours, when the instrument is in continuous usage.
2.4The 718A Charger also has a lowbattery indicator. This is an LED located at the left-hand side of the unit. When the battery voltage drops below operating level, the LED will light up. At this time, the user should
replace the battery. Usage of the 3M™ 718A Charger under lowbattery conditions would lead to insufficient voltage levels being generated.
3.0Operation of the 718 Static Sensor
Supplemental notes:
For accurate measurements during usage, it is recommended that the outside housing of the 3M™ 718 Static Sensor be connected to an electrical ground. This can be accomplished by having the user holding the instrument connected to ground through either a static control wrist strap, or while wearing static control footwear. The enclosure of the 718 is made of conductive plastic and is, therefore, electrically connected to whomever is holding the instrument. In addition, ground for the instrument can be provided through the Voltage Monitor Output on the front of the case.
The 718 Static Sensor is a precision electronic instrument. Improper use or rough treatment can damage the unit, and render it incapable of providing accurate measurements.
3.1Turning the unit ON and OFF: To turn on the 718 Static Sensor, momentarily press down on the membrane switch labeled POWER. Determining that the power is on can be verified by seeing that the liquidcrystal display (LCD) is on, and that the red light-emitting diodes in the front of the sensor are lit. To shut off the 718 Static Sensor, 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.
3.2Making 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 20 kV range activated, the static charge on the object cannot be measured with the 718 Static Sensor.
3.3Measurement Range: all measurements are in kilovolts (kV) as stated on the front label of the unit. The 718 has two measurement ranges: 0-2 kV and 0-20 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 0-2 kV range. Two digits following the decimal point indicate that the sensor is in 0-20 kV range. To change between measurement ranges, press the RANGE/HOLD button once, momentarily.
3.4HOLD Function: in the event that the user wishes to freeze the current measurement, the HOLD function of the 718 Static Sensor may be used. Simply press the HOLD switch momentarily and the currently displayed voltage will be frozen.
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