Desco 19780 Technical Bulletin

Surface Resistance Test Kit
Operation and Maintenance
Figure 1. Item 19780 Surface Resistance Test Kit

Description

The Surface Resistance Test Kit is a portable, accurate, and
versatile instrument designed to measure resistance
between two points (RTT), surface to ground (RTG), and
Surface Resistivity in accordance with ESD Association
Standard S4.1 including:
• Resistance measuring accuracy ± 10%
(E12 & greater ±20%)
• Resistance range <1.0 x 10
• Open circuit voltages of 10 and 100 volts ± 3%
• Electrification period of 15 seconds
• Electrodes (two) 5 pounds ± 2 oz with 50-70 durometer
conductive pads
In addition, the Meter measures ambient temperature and
relative humidity.
The Surface Resistance Test Kit (or its Meter) is referenced
and designed to be used to make measurements in
accordance with the test methods in:
• Worksurfaces - ESD S4.1 Worksurfaces - Resistance
Measurements
• Floors - ANSI/ESD S7.1- Resistive Characterization of
Materials Floor Materials
DESCO EAST - 90 Hudson Road, Canton, MA 02021-1407 • (781) 821-8370 • Fax (781) 575-0172 • Web Site: http://www.desco.com
TB-3014 5/02 Page 1 of 5
TECHNICAL BULLETIN TB-3014
3 12
ohms to >10 ohms
DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178 • Fax (909) 627-7449
• Footwear - ESD S9.1 - Footwear -
Resistive Characterization
• Garments - ESD STM2.1 Garments
• Seating - ESD STM12.1- Seating -
Resistive Measurement
• Floor/Footwear - ESD STM97.1 -
Floor Materials and Footwear-
Resistance Measurement in
Combination with a Person
• Workstations - ESD-ADV53.1 -
ESD Protective Workstations

Versatility:

Measures RTT, RTG or Resistivity
(requires optional Resistivity Attachment,
item 19782)
• Quick Checks - Surface resistance exponent
number illuminates immediately i.e. 8 = 10
100,000,000 ohms
• Periodic Checks of Installed Products - Surface
resistance exponent number illuminates immediately and
displays Temperature and Relative Humidity during 15
second electrification period making numerous measure-
ments and calculations to then display mantissa i.e. if
LED displays 8 and LCD displaying 7.14 as mantissa =
8
7.14 x 10 ohms or 714,000,000 ohms
• Test Lab Evaluation of Product - Display same as
Periodic Check above
ESD protective products should be tested:
A. Prior to installation to qualify for listing in user's ESD
control plan approved ESD protective materials (see
ANSI/ESD S20.20 paragraph 6.1.1.2)
B. During initial installation
C. For periodic checks of installed products as part of ESD
control plan compliance verification plan
Per ANSI/ESD S20.20, test equipment is required to enact
Compliance Verification Plan Requirement - "Test
equipment shall be selected to make measurements of
appropriate properties of the technical requirements that are
incorporated into the ESD program plan."
The Surface Resistance Test Kit is NIST calibrated and
items available are:
Model Description
19780 Surface Resistance Test Kit
19781 Meter (only)
19782 Resistivity Attachment
A pair of 5-pound Electrodes (item 50003), and or a pair of
Test Leads (item 19783) can be bought separately.
Made in America
8
ohms or
Power
2 x AA Batteries
2 x AA Batteries
N/A