Desco 19493 Installation guide

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3041 Page 1 of 6 © 2018 DESCO INDUSTRIES, INC.
Employee Owned
Ionization Test Kit
Operation and Maintenance
Description
The Desco Ionization Test Kit allows the 19492 Digital
Static Field Meter to be used to measure the o󰀨set
voltage (balance) and charge decay of ionization
equipment. The Test Kit also includes a Charger used to
place a ±1000V charge on the 19441 Conductive Plate,
making it possible to also measure the discharge times
of air ionization equipment per ANSI/ESD SP3.3 Periodic
Verication of Air Ionizers. The 19493 Ionization Test Kit
includes the 19492 Digital Static Field Meter, providing a
highly portable and cost e󰀨ective means of verifying the
performance of a wide variety of ionization equipment.
Note: The Digital Static Field Meter is designed to
operate only with the 19493 Ionization Test Kit. It is not
compatible with other brands.
Although not as accurate, the Desco Ionization Test Kit
has been designed to make measurements that
correspond to those made by using a charged plate
analyzer and ANSI/ESD S3.1. The Ionization Test Kit
provides convenience and portability to test per ANSI/
ESD SP3.3 Periodic Verication of Air Ionizers or
Compliance Verication ESD TR53. We recommend
the EMIT 50571 Charged Plate Analyzer if precise
measurements are required.
The Ionization Test Kit includes a slide-on isolated
Conductive Plate, a ±1000 volt Charger and a durable
thermoplastic carrying case with custom cut-outs for all
of the above components along with the Digital Static
Field Meter.
“When any object becomes electrostatically charged,
there is an electrostatic eld associated with that charge.
If an ESDS (ESD sensitive) device is placed in that
electrostatic eld, 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 eld and grounded
again, a second CDM event will occur as charge (of
opposite polarity from the rst event) is transferred from
the device.” (Handbook ESD TR20.20 section 2.7.5 Field
Induced Discharges)
“All nonessential insulators such as coffee cups, food
wrappers and personal items shall be removed from the
EPA.
The ESD program shall include a plan for handling
process-required insulators in order to mitigate
field-induced CDM damage.
If the field measured on the process required insulator
is greater than 2000 volts/inch and the process required
insulator is less than 30 cm (12 inches) from the ESDS
item, steps shall be taken to either:
A) Separate the required insulator from the ESDS item
by a distance of greater than 30 cm (12 inches); or
B) Use ionization or other charge mitigating techniques
to neutralize the charge.
If the field measured on the process required insulator
is greater than 125 volts/inch and the process required
insulator is less than 2.5 cm (1 inch) from the ESDS
item, steps shall be taken to either:
A) Separate the required insulator from the ESDS item
by a distance of greater than 2.5 cm (1 inch); or
B) Use ionization or other charge mitigating techniques
to neutralize the charge.
NOTE: The accurate measurement of electrostatic fields
requires that the person making the measurement is
familiar with the operation of the measuring equipment.
Most hand held meters require that the reading be taken
at a fixed distance from the object. They also normally
specify that the object has a minimum dimension of
fixed size in order to obtain an accurate reading.” (ANSI/
ESD S20.20-2014 section 8.3.1 Insulators)
Figure 1. Desco 19493 Ionization Test Kit
April 2018
TECHNICAL BULLETIN TB-3041
Made in the
United States of America

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3041 Page 2 of 6 © 2018 DESCO INDUSTRIES, INC.
Employee Owned
Packaging
1 Digital Static Field Meter
1 Conductive Plate
1 Charger
2 9V Alkaline Batteries
1 Carrying Case
1 Certicate of Calibration
Features and Components
DIGITAL STATIC FIELD METER
See technical bulletin TB-3040 for information on the
Digital Static Field Meter that is included in the 19493
Ionization Test Kit.
CHARGER
A. Output Contact: The output contact is connected to
an internal power source. When the touch plate located
underneath the unit is connected to ground, the output
contact will provide a charge of the indicated polarity.
The charger is designed so that an operator can press
the rocker switch and touch the plate simultaneously
with the ngers of the same hand.
B. Rocker Switch: Press and hold to select the polarity
that will be provided at the Output Contact.
C. Touch Plate: Make contact with the touch plate while
pressing down the rocker switch to provide voltage to the
Output Contact. The operator must be properly
grounded during use.
D. Battery Compartment: Slide the cover down to open
the 9V battery compartment.
Operation
TAKING OFFSET VOLTAGE (BALANCE)
MEASUREMENTS
The Ionization Test Kit has been designed to match the
compact size and hand held convenience of the Digital
Static Field Meter. Use the following procedure to verify
the o󰀨set voltage (balance) of air ionization equipment.
This quick and easy procedure will help determine if
the piece of ionization equipment is working within the
manufacturer’s specications or user requirements.
It is extremely important that ionizers be checked
regularly for o󰀨set voltage (balance) and discharge
times. An ionizer operating in an out-of-balance
state can place a charge on sensitive electronic
components or assemblies.
Note: The Digital Static Field Meter is built in a
conductive case. The instrument senses the di󰀨erence in
potential between the case (and the person holding the
case / ground connection) and the surface under test.
Ensure that the person using the instrument is wearing
a wrist strap and grounded to achieve more accurate
measurements.
INSTALLING THE ISOLATED PLATE ASSEMBLY
The Digital Static Field Meter’s case has two slots along
its sides. The top slot is closest to the face of the
instrument. Slide down the tabs of the Conductive Plate
plate into the top slot of the Meter’s case as far as they
go (see Figure 3).
FRONT VIEW
BACK VIEW
A
B
C
D
Figure 2. Charger features and components

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3041 Page 3 of 6 © 2018 DESCO INDUSTRIES, INC.
Employee Owned
ZERO THE METER
Turn the Meter on by pressing the POWER button. Press
the RANGE / ZERO button to set the Meter to the 2 kV
(3 decimal places) range. Make contact between the top
of the Conductive Plate and a grounded surface. Press
and hold the RANGE / ZERO button until the Meter
displays “.000”.
MAKING A MEASUREMENT
Locate the Test Kit in an ionized environment at the
appropriate distance from the device under test. The
static eld displayed is the actual balance of the ionizer
or voltage o󰀨set. The display will indicate “1” or “-1”
when the Meter is over-ranged. Change the range of the
unit if necessary.
Note: When testing pulsed ionizer systems, the voltage
displayed is constantly changing. This pulse rate may be
faster than the display update rate of the Field Meter,
therefore the displayed voltage is an average of the
actual voltage. The output of the Field Meter is useful in
this situation for more accurate measurements.
Figure 3. Installing the 19441 Conductive Plate
Figure 4. Reading the Digital Static Field Meter while in
the ±20 kV range
Thousands
Hundreds
Tens
Figure 5. Reading the Digital Static Field Meter while in
the ±2 kV range
Hundreds
Tens
Ones

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3041 Page 4 of 6 © 2018 DESCO INDUSTRIES, INC.
Employee Owned
POLARITY SELECTION
The top of the rocker switch is labeled “+”, and the
bottom is labeled “-”. To provide a POSITIVE voltage
output, touch the plate located underneath the charger,
and press the switch forward at the same time. To
provide a NEGATIVE voltage output, touch the plate
located underneath the charger, and press the switch
downward at the same time.
Note: For the Charger to work correctly, the operator
and Field Meter must be properly grounded. A ground
path to the touch plate must exist.
IONIZER DISCHARGE TIME MEASUREMENTS
Use the Field Meter with the conductive plate in the
appropriate location for measurements.
POSITIVE DISCHARGE TIME MEASUREMENTS
To provide a POSITIVE voltage output, touch the plate
located underneath the Charger, and press the switch
forward at the same time. Momentarily touch the
Charger’s output terminal to the conductive plate
attached to the Field Meter. The meter reads
approximately +1.10 kV. By using a stop watch or other
timing device, determine the time needed for the
voltages to decrease from +1.10 kV to +0.10 kV. This is
the positive discharge time.
12"
18"
Figure 6. Auditing ionization equipment with the Digital
Static Field Meter and Conductive Plate (Ref: ANSI/ ESD
SP3.3)
HOLDING THE LAST READING
With the meter positioned 1 inch from the object being
measured, press the HOLD button. This will freeze the
reading from the object on the display and the analog
output signal. This feature allows the operator to move
the meter where it may be more easily read or saved for
later reference.
Note: The red ranging lights will be o󰀨 while the meter is
in HOLD mode. It is advised to do this between
measurements to prolong battery life.
ANALOG OUTPUT
The analog output jack labeled “OUT” on the face of the
meter accepts a standard 2.5 mm monaural phone plug
and is provided so the output of the Digital Static Field
Meter may be connected to an oscilloscope, strip chart
recorder, external meter or other device. The voltage at
this output is 1/1000th (±2 kV range) or 1/10,000 (±20
kV range) of the measured voltage. Contact Customer
Service for more information.
TAKING DISCHARGE TIME MEASUREMENTS
In order to verify that an ionizer is operating properly it is
also important that its ability to neutralize or discharge
static electricity is measured. The following procedure
will measure an ionizer’s discharge time:
OPERATING THE CHARGER
The Charger has a momentary rocker-switch that powers
the unit. Holding the switch forward / backward supplies
power to the output terminals.
Figure 7. Charging the Conductive Plate on the Digital
Static Field Meter
NEGATIVE DISCHARGE TIME MEASUREMENTS
To provide a NEGATIVE voltage output, touch the plate
located underneath the Charger, and press the switch
downward at the same time. Momentarily touch the
Charger’s output terminal to the conductive plate
attached to the Field Meter. The meter reads
approximately -1.10 kV. By using a stop watch or other
timing device, determine the time needed for the
voltages to decrease from -1.10 kV to -0.10 kV. This is
the negative discharge time.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3041 Page 5 of 6 © 2018 DESCO INDUSTRIES, INC.
Employee Owned
IMPORTANT: A ground path must be provided between
the touch plate of the Charger and the ground reference
of the Field Meter. This is normally provided by holding
the Charger in one hand and the Field Meter with
Conductive Plate in the other.
Maintenance
The Digital Static Field Meter is factory calibrated and no
maintenance is required. If for any reason you believe
the Meter is not working correctly, please contact Desco
Customer Service. CAUTION - There are no user
serviceable parts. Any unauthorized service will void the
warranty and result in additional repair charges.
Note: This Meter is a precision instrument and should
not be subjected to dropping as that would void the
warranty.
BATTERY CHECK
The battery should be replaced when “BAT” is indicated
on the display. Always replace the battery with a 9V
alkaline or equivalent battery in order to remain CE
compliant.
BATTERY REPLACEMENT
The Digital Static Field Meter operates from a standard 9
VDC alkaline battery. Battery life is in excess of 50 hours
under normal use. When the battery voltage drops below
6.5 V, “BAT” will appear on the display. To change the
battery, slide the battery cover down at the back of the
Meter and remove the battery from the
battery clip. Replace the battery with a fresh one and
reinstall the battery cover. The battery should be
removed from the Meter if its is to be stored for an
extended period of time.
The battery in the Charger should be replaced annually
or when it is unable to provide approximately ±1100V.
CLEANING
It is important to keep the insulators on the adapter plate
clean and free of contaminates that may cause surface
leakage. To test the performance of the adapter plate,
charge the plate and note the discharge rate in a
nonionized area. The self discharge rate to 10% of
original voltage should not be less than ve minutes.
The area around the aperture of the Digital Static Field
Meter must be kept clean to ensure accurate, drift-free
readings. Never touch the aperture with anything. To
remove dust or other particulate matter, use low-
pressure instrument-grade air. To remove more severe
contamination, spray or ush with the smallest practical
amount of clean technical-grade of isopropyl alcohol.
Then allow the instrument to air dry for several hours.
Specications
STATIC FIELD METER
Performance
Measurement Range (switch selectable)
Low Range 0 to ±2kV / inch
High Range 0 to ±20 kV / inch
Measurement Accuracy
Voltage Monitor Output Better than ±5% of reading,
10mV
Voltage Display Better than ±5% of reading,
±2 counts
Measurement Stability ±10 counts
Voltage Monitor
Output 2 volts output at full scale
Ratio
Low Range 1/1000 of the measured
electrostatic eld
High Range 1/10000 of the measured
electrostatic eld
Front Panel Meter
Voltage Display 3-1/2 digit LED display
Range
Low 0 to ±1.999 kV / inch
High 0 to ±19.99 kV / inch
Display Resolution
Low Range 1 V / inch
High Range 10 V / inch
Sampling Rate 3 readings per second
Features
Automatic Shuto󰀨 Unit will shut o󰀨 after 20
minutes from last activity
Ranging System LED distance indicator;
aligned targets indicate one
(1) inch
Range / Zero Switch LED distance indicator.
Resets the instrument to zero
and selects the measurement
range.
Low Battery Indicator An LCD display message
indicates when the battery is
low
Hold Switch Retains the LCD display
reading when depressed

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • [phone]
DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • [phone] • Website: Desco.com
TB-3041 Page 6 of 6 © 2018 DESCO INDUSTRIES, INC.
Employee Owned
General
Dimensions 0.9" H x 2.8" W x 4.9"L
(24 mm x 70 mm x 126 mm)
Weight 4.9 oz. (140 g) with battery
Voltage Monitor
Connection
2.5 mm jack (3/32")
monophone
Tip Signal
Sleeve Ground
Operating Conditions
Temperature 50 to 86ºF (10 to 30ºC)
Relative Humidity To 80%, non-condensing
Altitude To 2000 m
Certications CE
Power Requirements
Power One (1) 9-volt alkaline battery
Operating Time Greater than 50 hours,
with a new battery at 21ºC
continuous
Power Switch A membrane switch that
is designed to prevent
accidental turn on. Powers
the instrument on and o󰀨.
IONIZATION TEST KIT
Charge Plate Assembly Aluminum bracket, bare
aluminum plate and teon
spacers isolate plate from
bracket
Voltage Output 1/1,000 of measured voltage
@ low range
1/10,000 of measured
voltage @ high range
Charge Plate Area 2.95" W x 1.18" L
(7.5 x 3.0 cm)
Charge Plate Assembly
Weight
2.4 oz. (68 g)
Charger Dimensions 1.1" H x 2.6" W x 4.5" L
(2.8 x 6.6 x 11.4 cm)
Charger Weight 5 oz. (140 g) with battery
Charger Power
Requirements
One 9-volt alkaline battery
Charger Output (using
Static Field Meter with
charge plate)
1.1 kV minimum for ± voltage
Certications CE
Limited Warranty, Warranty Exclusions, Limit
of Liability and RMA Request Instructions
See the Desco Warranty -
Desco.com/Limited-Warranty.aspx