This tester is created by Advance Tech, which is specially utilized to detect Electrostatic Field Meter. It also has the function of ion equilibrium test. A brand-new non-contact surface area possible sensor is used in the tester, which can efficiently detect the fixed electricity lugged by items, such as plastic, chemical fiber, hair and human body.The tester is basic to use and very easy to lug. It is an essential measuring device in the process of anti-static as well as electrostatic treatment.
Generally a Electrostatic Field Meter works by utilizing a ground referenced capacitive sensing unit. When the sensing unit is revealed to an external electrostatic field, fee is induced on the sensor plate and the voltage produced throughout the sensing unit is proportional to the field toughness. When the sensor is adjusted (at a given range, usually one inch for example), we can determine the actual area strength through the gauged generated voltage. This US License (4716371 A) explains the operating concept in a little bit a lot more detail.
Advanced Electrostatic Field Meter sometimes uses the so-called Kelvin vibrating capacitive sensing unit approach. By shaking the picking up plate (usually a sinusoidal function), the distance dependence can be gotten rid of or significantly minimized.
The meter we are mosting likely to check out is an approximately twenty years old Plastic Equipments (currently ESD Solutions) 42721 fixed Electrostatic Field Meter (picture shown listed below). Since the instance needs to be ground referenced, the plastic material made use of to make the case is actually conductive (in GΩ range). During typical use, when a grounded operator holds the meter the meter comes to be grounded too. Additionally, a grounding wire can be linked directly to the tool.
From the picture below, you can see the sensor located towards the middle on the top of the tool. The two LEDs are arranged at an angle and also are at the same time lit in operation. This arrangement aids customers to visually determine the right operating range at which the two light places become one.
After getting rid of the back cover, we can see the rear end of the circuit board. The primary chip used in this Electrostatic Field Meter is a Microchip PIC16C54 8-bit microcontroller. The date code recommends that this unit was made at some point after 1995.
On the flip side of the board, we can see the analog circuitry. The major amplifier for the capacitive sensor is a ICL7621 high input resistance, ultra reduced input current and also low drift operational amplifier. These buildings are critical for magnifying the small DC signal created on the capacitive component. To the right of the picture, there is an LMC6064 accuracy quad micropower functional amplifier.