The surface potential was measured with an
electrostatic voltmeter (Monroe 244 Model with 1017AE electrostatic voltage probe) immediately after charging.
These companies find necessary the use of more robust process assessment tools, such as an
electrostatic voltmeter and ESD event detectors.
The Model 279L
Electrostatic Voltmeter has a range of [+ or -] 300 V, accuracy of 0.1% or 10 mV, and resolution of 100 mV.
The charge was estimated using a device similar to the Faraday cylinder; the deposited material was shaken down into the inner chamber, which was connected to the
electrostatic voltmeter. From the voltmeter readings U and known capacitance of the measuring circuit C, the charge magnitude was calculated as follows: q = U x C; then, after the sample was weighed, an average mass (total) charge was found: q/m, C/kg.
In addition, the non-contact
electrostatic voltmeters and field meters complement those of Trek, AE's most recent acquisition.
TREK INC, a designer and manufacturer of high-voltage amplifiers and
electrostatic voltmeters, is launching its new Electrostatic Chuck Supply, Trek Model 646, at SVC TechCon 2013.
Two options for mounting instruments inside equipment include static sensors and special
electrostatic voltmeters and electrostatic fieldmeters with small probes.