DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Website:
Desco.com
TB-2016
Page 4 of 6
© 2015 DESCO INDUSTRIES, INC.
Employee Owned
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 the figures below. The performance of the ionizer was measured with the unit positioned as
shown, with the fan speed on high and without a filter.
TP1
>60(+)
>60(-)
12"
12"
12"
12"
12"
TP4
>60(+)
>60(-)
TP7
28.0(+)
32.0(-)
TP10
18.0(+)
20.0(-)
TP2
1.2(+)
1.4(-)
TP5
1.5(+)
2.0(-)
TP8
2.3(+)
3.0(-)
TP11
3.1(+)
4.0(-)
TP3
>60(+)
>60(-)
TP6
>60(+)
>60(-)
TP9
20.0(+)
23.0(-)
TP12
15.0(+)
20.0(-)
Bench Top
Blower Ionizer
Air Flow
Charged Plate
12"
Figure 7. Neutralization (Discharge) Times of item
19500
at 120VAC, 60Hz input
