Desco 19443 Operation & Maintenance Manual

Static Field Meter & Ionization Test Kit
Operation and Maintenance
Figure 1. Desco 19442 Digital Static Field Meter
Figure 2. Desco 19443 Air Ionization Test Kit

Description

The Desco 19442 Digital Static Field Meter indicates
surface voltage and polarity on objects. The meter has
a measurement range of 0 to ±19.99 kV at a distance of
1 inch and a measurement accuracy of ±5%. It utilizes
a chopper-stablized sensor for use in both normal
and ionized environments. The meter's enclosure is
dissipative and features a 7 mm snap and ground
cord for bonding to equipment ground. A rotary zero
knob sets the zero-reference point with finely tuned
precision, and a Hold button allows the user to "freeze"
a displayed measurement for evaluation. A LED range
indicator assists with placing the meter at the correct
distance from the object being measured.
TB-3090 Page 1 of 8
September 2021
TECHNICAL BULLETIN TB-3090
The Desco 19443 Air Ionization Test Kit includes and
utilizes the 19442 Digital Static Field Meter to measure
the offset voltage (balance) and charge decay of
ionization equipment. The Air Ionization Test Kit also
includes a charger used to place a ±1000V charge on
the conductive plate, making it possible to also measure
the discharge times of air ionization equipment per ANSI/
ESD SP3.3 Periodic Verification of Air Ionizers.
Although not as accurate, the Desco Air Ionization Test
Kit is designed to make measurements that correspond
to those made by using a charged plate monitor and
ANSI/ESD STM3.1. The Air Ionization Test Kit provides
convenience and portability to test per ANSI/ESD SP3.3
Periodic Verification of Air Ionizers or Compliance
Verification ESD TR53. Desco recommends using the
770004 or 770005 Charged Plate Analyzer if precise
measurements are required.
All Digital Static Field Meters and Air Ionization Test
Kits are calibrated to NIST standards and include a
certificate.
"When any object becomes electrostatically charged,
there is an electrostatic field associated with that charge.
If an ESDS (ESD sensitive) device is placed in that
electrostatic field, a voltage may be induced on the
device. If the device is then momentarily grounded, a
transfer of charge from the device occurs as a CDM
(Charged Device Model) event. If the device is removed
from the region of the electrostatic field and grounded
again, a second CDM event will occur as charge (of
opposite polarity from the first event) is transferred from
the device." (Handbook ESD TR20.20 section 2.7.5 Field
Induced Discharges)
The Digital Static Field Meter, Air Ionization Test Kit,
and its accessories are available as the following item
numbers:
Item Description
19442 Digital Static Field Meter
19443 Air Ionization Test Kit
19440 Conductive Plate and Charger
19441 Conductive Plate
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