TB-3040 Page 1 of 6
© 2009 DESCO INDUSTRIES, INC.
Employee Owned
Made in America
Digital Static Field Meter
Operation and Maintenance
Description
The Desco Digital Static Field Meter is a high quality,
portable non-contacting static eld meter which
consistently produces accurate readings with ease and
provides years of trouble-free operation.
The Digital Static Field Meter indicates surface voltage
and polarity on objects up to ±19.99 kV at a distance of
1 inch with an accuracy of ±5% of the displayed value. It
is chopper-stabilized for use under almost any condition
including ionized environments. The conductive case
and ground snap facilitate grounding for accurate
measurement. Also featured are a zero button and a
display hold function. A unique LED rangender
system provides accurate positioning of the Meter from
the target.
TECHNICAL BULLETIN TB-3040
Its accuracy is dependent upon three factors:
• Grounding of the Meter via a ground cord (not
included) (Meter is also grounded when held by a
grounded operator).
• The instrument must be properly zeroed.
• The distance from the front edge of the case to the
target or surface under examination must be
accurately dened.
Charged insulators in the ESD protected area can
adversely impact quality, productivity, and reliability.
“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)
Compliance verication should include periodic checks
with a static eld meter to determine if high charging
material is present in the ESD protected area. All
packaging and other materials that may be electrostatic
generative to 2,000 volts must be kept a minimum of 12"
from ESD sensitive items at all times. It is proper to rub
an item and measure that it can charge.
“In order to mitigate eld-induced CDM (Charged Device
Model) damage, the ESD program shall include a plan
for the handling of process-required insulators. If the
eld exceeds 2,000 volts/inch, steps shall be taken to
either:
A. Separate the insulator from the ESD-sensitive device
by a distance of 30 cm (12 inches); or
B. Use ionization or other charge mitigating techniques
to neutralize the charge.” (ANSI/ESDS20.20 section
8.3)
Other steps that can be taken are to remove the item
from the ESD protected area or replace with a static
control protective version of the item.
Figure 1. Desco 19492 Digital Static Field Meter
Rev. June 2009
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
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