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Charged Plate Monitor – Model 156A
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The
Model 156A Charged-Plate Monitor is an important tool for evaluating the
performance of air
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ionizers used to neutralize
static charges. The Model 156A tests the efficiency of an ionizer’s ion
production
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by
timing how long it takes air ions produced to discharge a floating plate that
has been pre-charged
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to either a positive
or negative value. The Model 156A also tests the balance between positive and
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negative
air ions by measuring the offset voltage generated on a floating plate due to
an imbalance of
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positive and negative
air ions impinging on the plate from the ionizer.
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Applications
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§ ESD monitoring of sensitive manufacturing processes
such as semiconductor, disk drive and LCD.
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§ Testing of
all types of ionizers, including room ionization systems, AC and DC blowers,
nuclear ionizers, gun type ionizers, and pulsed DC ionizers.
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§ High temperature applications.
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§ ESD
measurement of de-ionized water.
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§ Dissipative testing applications.
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At a Glance
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Large
Signal Bandwidth:
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DC
to 10 Hz
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Decay
Mode Thresholds:
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User
selectable for 10 V or 100 V, +/-2%.
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Start/Stop Voltages:
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Programmable from 1 to +/-1000 V in 1 V
increments
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Start/Stop Accuracy:
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Within +/-1 V of programmed voltage
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Features
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Mode
Select
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A
three-position toggle switch selects the +Decay, -Decay, or Float mode of
operation. This switch is also used in combination with the Test/Reset Control
switch to program the START and STOP volltages.
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Test/ Reset Control
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A momentary toggle switch used in
conjunction with the Mode Select switch to program the START and STOP
voltages
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+Decay
and –Decay Modes
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Sets
the plate voltage to a value greater than the programmed start voltage and
resets the decay timer to zero
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Float Mode
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Sets the plate voltage to 0 V +/- 2 V
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Plate
Voltage Digital
Panel
Meter
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3.5
digit red LED display
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Range
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0
to +/-1100 V
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Resolution
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1
V
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Accuracy
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Better
than 0.1% of full scale +/-1 count
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Decay Time Digital
Panel Meter
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4-digit red LED display
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Range
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0 to 9999 seconds
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Mechanical Specifications
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Dimensions
(H x W x D)
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83
x 318 x 280 mm (3.25 x 12.5 x 11
in)
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Weight
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2 kg (4.4 lb)
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Connections
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Voltage
Monitor
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BNC
Connector
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Ground
Receptacle
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Banana
Jack
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Cable
156A to Plate
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Coaxial
(3 m length, 4.95 mm diameter)
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Environmental Specifications
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Temperature
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5 to 35°C (41 to 95°F)
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Relative
Humidity
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To
80% RH, noncondensing
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Altitude
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To 2000 m (6561.68 ft.)
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