Desco 19492 Installation guide

DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: [phone] • E-mail: [email protected], Website: DescoEurope.com
TB-3040.E Page 1 of 5 © 2018 DESCO INDUSTRIES INC
Employee Owned
Digital Static Field Meter
Operation and Maintenance
Description
The Desco Digital Static Field Meter indicates surface
voltage and polarity on objects. The meter can measure
ranges of 0 to ±1.999kV or 0 to ±19.99kV at a distance
of 25mm with an accuracy of ±5% of the displayed
value. The automatic zero button allows adjustment to
zero with no screws or dials to turn. The hold button
allows the user to “freeze” a displayed measurement
for evaluation. A LED range finder helps the operator to
place the meter at the correct distance from the surface
being measured. The meter will automatically turn off
after 20 minutes to conserve battery power (9V). The
Digital Static Field Meter is calibrated with accepted
procedures and standards traceable to the National
Institute of Standards and Technology.
“All non-essential insulators and items (plastics and
paper), such as coffee cups, food wrappers and
personal items shall be removed from the workstation or
any operation where unprotected ESDS are handled.
The ESD threat associated with process essential
insulators or electrostatic field sources shall be
evaluated to ensure that:
• the electrostatic field at the position where the
ESDS are handled shall not exceed 5 000 V/m;
or
• if the electrostatic potential measured at the surface
of the process required insulator exceeds 2 000 V,
the item shall be kept a minimum of 30 cm from the
ESDS; and
• if the electrostatic potential measured at the surface
of the process required insulator exceeds 125 V,
the item shall be kept a minimum of 2,5 cm from the
ESDS.
If the measured electrostatic field or surface potential
exceeds the stated limits, ionization or other charge
mitigating techniques shall be used.” [IEC 61340-5-1
Clause 5.3.4.2 Insulators]
Packaging
1 Digital Static Field Meter
1 9V Alkaline Battery
1 CerticateofCalibration
Figure 1. Desco 19492 Digital Static Field Meter
March 2018
Made in the
United States of America
TECHNICAL BULLETIN TB-3040.E

DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: [phone] • E-mail: [email protected], Website: DescoEurope.com
TB-3040.E Page 2 of 5 © 2018 DESCO INDUSTRIES INC
Employee Owned
Operation
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.
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.
ZERO THE METER
Turn the meter on by pressing the POWER button.
Press the RANGE / ZERO button to set the meter to
the 2kV (3 decimal places) range. Point the top of the
Meter approximately 25mm away from a grounded metal
surface. Use the red LED range guide. The Meter is
properly positioned when the projected red bullseyes
are centered on top of each other. Press and hold the
RANGE / ZERO button until the meter displays “.000”.
MAKING A MEASUREMENT
Place the meter 25mm from the object to be measured.
This distance is measured from the front edge of the
meter case to the surface of the object. The meter now
displays a reading (from 0 to ±.200 or ±2.00) of the
electrostaticeldinkilovoltsperinch.
Note: The red ranging lights are provided to help place
the meter at the correct distance from the object. The
lights are set to produce a concentric red bullseye
patternonaatopaquesurface25mmfromthefront
edge of the meter. This can be practiced by aiming the
meter at a sheet of white paper.
The display will indicate “1” or “-1” when the meter is
over-ranged. Change the range of the unit if necessary.
If the measurement exceeds 20kV, move the meter
farther away from the object and multiply the reading
by the distance (in inches) away from the object being
measured. The measurement accuracy is dependent on
a stable ground reference and the 25mm measuring
distance. It is also dependent on the “aspect ratio”,
relating the size of the object to be measured to the
measurement distance.
Features and Components
Figure 2. Digital Static Field Meter features and
components
A
B
C
D
FRONT VIEW
BACK VIEW
E
A. POWER Button: Press to turn the unit ON and OFF.
B. RANGE / ZERO Button: Press to select the
measurement range. Press and hold to zero the meter.
C. Analogue Output Jack: A low-voltage signal of the
measured voltage is provided at this output. The voltage
is 1/1000th (±2kV range) or 1/10,000 (±20kV range) of the
measured voltage.
D. HOLD Button: Press to freeze the reading on the
display. Press again to return to normal measurement
operation.
E. Battery Cover: Slide the cover down to open the 9V
battery compartment.

DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: [phone] • E-mail: [email protected], Website: DescoEurope.com
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Figure 3. Reading the Digital Static Field Meter while in
the ±20kV range
Thousands
Hundreds
Tens
HOLDING THE LAST READING
With the meter positioned 25mm from the object being
measured, press the HOLD button. This will freeze the
reading from the object on the display and the analogue
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.
ANALOGUE OUTPUT
The analogue output jack labelled “OUT” on the face of
the meter accepts a standard 2.5mm 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 (±2kV range)
or 1/10,000 (±20kV range) of the measured voltage.
Contact Customer Service for more information.
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 6.5V, “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.
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
Europe Customer Service. CAUTION - There are no
user serviceable parts. Any unauthorised 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 damage would not be
covered by the limited warranty.
Figure 4. Reading the Digital Static Field Meter while in
the ±2kV range
Hundreds
Tens
Ones
Note: This aspect ratio should be at least 3 for best
accuracy, i.e. the object should be at least a 3 inch
(75mm) square when measuring at a 1 inch (25mm)
distance. Accurate measurements may be made at other
measurement distances by scaling the meter range and
observing the proper aspect ratio. For example, at a
measurement distance of 3 inch (75mm), multiply the
meter reading by 3 to give a range of 0 to 60 kilovolts.
For accuracy, the object being measured at this distance
should be at least a 9 inch (230mm) square.

DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: [phone] • E-mail: [email protected], Website: DescoEurope.com
TB-3040.E Page 4 of 5 © 2018 DESCO INDUSTRIES INC
Employee Owned
Specications
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 ±1.999kV / inch
High 0 to ±19.99kV / inch
Display Resolution
Low Range 1V / inch
High Range 10V / inch
Sampling Rate 3 readings per second
Features
AutomaticShut-O󰀨 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
General
Dimensions 0.9" H x 2.8" W x 4.9"L
(24mm x 70mm x 126mm)
Weight 4.9oz. (140g) with battery
Voltage Monitor
Connection
2.5mm 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 2000m
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󰀨.

DESCO EUROPE - 2A DUNHAMS LANE, LETCHWORTH, HERTFORDSHIRE, SG6 1BE, UK
Phone: [phone] • E-mail: [email protected], Website: DescoEurope.com
TB-3040.E Page 5 of 5 © 2018 DESCO INDUSTRIES INC
Employee Owned
Figure 5. Installing the 19441 Conductive Plate
30.5cm
45.7cm
Figure 6. Auditing ionisation equipment with the Digital
Static Field Meter and Conductive Plate
(Ref: IEC 61340-4-7)
Limited Warranty, Warranty Exclusions, Limit
of Liability and RMA Request Instructions
See the Desco Europe Warranty -
DescoEurope.com/Limited-Warranty.aspx
Ionisation Test Kit Accessories
DescoEuropeo󰀨ersaccessoriesfortheDigitalStatic
Field Meter designed to facilitate routine auditing and
periodic testing of ionisation equipment
(Ref: IEC 61340-4-7). The Meter and accessories
combination can be used to test an ioniser’s overall
performance. This highly portable test kit allows the
usertomakequickandaccurateo󰀨setvoltagebalance
level and neutralisation discharge time measurements
(counting or using a stopwatch). These accessories are
available as Desco item 19440 Test Kit Upgrade which
includes the Conductive Plate and Charger.