DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Website:
TB-3041
Page 3 of 6
© 2009 DESCO INDUSTRIES, INC.
Employee Owned
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 offset 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 specifications or user requirements.
It
is extremely important that ionizers be checked
regularly for offset 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 difference
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
grounded or that the rear panel ground snap connection
is utilized to achieve 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 4).
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 2 kV (3 decimal places) range. Point the top of the
Meter approximately 1 inch 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
Locate the Test Kit in an ionized environment at the
appropriate distance from the device under test. The
static field displayed is the actual balance of the ionizer
or voltage offset. The display will indicate “1” or “-1”
when the Meter is over-ranged. Change the range of the
unit if necessary. (see Figure 3).
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 4. Installing the
Conductive Plate
12"
18"
Figure 5. Auditing ionization equipment with the Digital
Static Field Meter and Conductive Plate (Ref: ANSI/ESD
SP3.3)