TB-9107
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© 2021 DESCO INDUSTRIES INC
Employee Owned
SCS
- 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website:
Calibration
The SCS Ion Pro™ Benchtop Ionizer is factory adjusted to provide optimum performance. Further adjustment in
the field is not possible. However, the following instructions can be followed to determine whether the Ionizer is
performing to specifications. The testing follows the procedure outlined in the standard for Ionization, ANSI/ESD
STM3.1. Please refer to this standard for more complete information.
Frequency of recalibration should be based on the critical nature of those ESD sensitive items handled and the
risk of failure for the ESD protective equipment and materials. In general, SCS recommends that calibration be
performed annually.
Periodically measure the balance and neutralization times of the Bencthop Air Ionizer to verify that it is performing
within specifications. These measurements should be taken using a charged plate monitor. Calibration should
be performed in accordance with the ESD Association ionization standard ANSI/ESD STM3.1. With the ionizer
positioned a distance of 12 inches (30 cm), the neutralization (discharge) time of ±1000V to ±100V should be less
than 1.5 seconds, and the balance should be ±3V or better.
Neutralization (Discharge) Times
The comparative efficiency of bench top ionizers is determined by a standard test published by the ESD
Association: ANSI/ESD STM3.1. Typical positive and negative decay times (±1000V to ±100V) measured using this
standard are shown in the figure below.
NOTE: All discharge times are in seconds and representative only. They are not a guarantee. The discharge times
were recorded in a factory ambient environment.
TP1
+ >60
- >60
12"
12"
12"
12"
12"
TP4
+28.3
-38.9
TP7
+17.9
-21.7
TP10
+25.7
-26.7
TP2
+1.0
-1.2
TP5
+2.9
-3.6
TP8
+5.3
-6.3
TP11
+8.5
-10.6
TP3
+ >60
- >60
TP6
+60.0
-59.4
TP9
+17.8
-32.5
TP12
+21.8
-22.0
Ion Pro™
Benchtop Ionizer
Air Flow
Charged Plate
12"
Figure 7. Neutralization (Discharge) Times at 120VAC / 220VAC, 60Hz input
