TB-6590
Page 4 of 5
© 2018 DESCO INDUSTRIES INC
Employee Owned
EMIT
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 664-9980 • Website:
DescoEMIT.com
Neutralization (Discharge) Times
All data was taken with the fan speed set to high. All time measurements are in seconds.
NOTE: Discharge times in seconds are representative only and are not a guarantee. Discharge times are actual
measurements recorded in a factory ambient environment.
Per ANSI/ESD S20.20, the test method for Product Qualification test is ANSI/ESD STM3.1, and for Compliance Verification
is ESD TR53 which advises “Measurements should be made at the location where ESD sensitive items are to be ionized.”
A larger area may require additional ionizers. Per S20.20 the required limit for ionizer discharge time is user defined. Use
Table to determine the number of ionizers to achieve ionization of area to be neutralized to meet your company’s ESD control
plan specified discharge times.
The comparative efficiency of bench top ionizers is determined by a standard test published by the ESD Association: ANSI/
ESD STM 3.1. Typical positive and negative decay times (1000V - 100V) measured using this standard are shown in Figure
5. The performance of the ionizer was measured with the unit positioned as shown, with the fan speed on high and without a
filter.
TP1
+35.3
-32.1
12"
12"
12"
12"
TP4
+15.1
-23.0
TP7
+14.0
-20.9
TP2
+1.6
-2.3
TP5
+2.9
-4.4
TP8
+4.8
-7.4
TP3
+48.2
-60.7
TP6
+14.2
-25.3
TP9
+14.0
-17.3
Mini Zero
Volt Ionizer
Air Flow
Charged Plate
12"
Figure 6. Neutralization (Discharge) Times
Optimal
Coverage
Area
