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2.1.1
Charged Plate Detector
The Charged Plate Detector converts the Model 204 to a charged
plate monitor having the specified 20pf (ESD S3.1) capacitance
with both the 2.5"x1" (161x25mm) detector plate and the optional
6"x6" (152x152mm) standard size plate. When installed, the
detector plate contacts the charging source and the sensitivity of
the measurement system is increased by a factor of 10. After + or
-V is applied, the system automatically converts to a timer when
the voltage on the plate drops to 1000V, within the range of 0-60
seconds with 0.3 seconds resolution. It then measures the time for
the charge on the plate to bleed down to 100V at which time the
DPM switches over from a voltage display to a time display. If the
charging source is not activated then the instrument just measures
the detected voltage generated by ionizer imbalance, static
propensity, or any charged object placed onto the charged plate.
The 6"x6" (152x152mm) square detector plate (included in the
Model 216 Kit) plugs into the Model 205C detector plate to provide
full size charged plate monitor capability. The maximum current
output of the charging source is limited to 1 μAmp.
2.2
Model 216 Charged Plate Monitor Kit
This section describes the other functional components included in the
Model 216 Kit shown in Figure 2-2. The included tripod is used to hold the
Model 204 in either a vertical or horizontal position to facilitate ionizer
(horizontal) and charged plate (vertical) measurements.
Figure 2-2: Model 216 Charged Plate Monitor Kit
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