DESCO WEST
- 3651 Walnut Avenue, Chino, CA 91710 (909) 627-8178 Fax (909) 627-7449
DESCO EAST
- One Colgate Way, Canton, MA 02021-1407 (781) 821-8370 Fax (781) 575-0172 Website: Desco.com TB-3055
Page 1 of 4
2012 DESCO INDUSTRIES, INC.
Employee Owned
Low Resistance Tester
Operation and Maintenance
Description
Desco’s Low Resistance Tester is designed to measures
resistance of grounding paths of banana jacks and other
equipment. Selectable Test Ranges: <1 ohm, <2 ohms and
<20 ohms allow the operator to test grounding conductors
per ANSI/ESD S6.1 – Grounding and ESD TR20.20. The
Tester is equipped with pass/fail (go/no go) audio and
visual indicators that activate to confirm that the grounding
conductor being tested meets the test range. The low
battery indicator lets the operator know when battery needs
to be replaced.
ESD Handbook ESD TR20.20 section 5.5.2.2 Electrical
Hand Tools
“All electrical tools and equipment used to process ESD
sensitive devices require the three prong, grounded-type AC
plug. The metal portions of the tool that touch the device
should have a low resistance (<2 ohms) to the equipment
ground terminal on the plug. In some cases, the user
may wish to verify that the metal portions of the tool have
acceptable voltage levels and leakage current. The tester
defined in ESD STM13.1 provides a means of checking
soldering iron tips while being used. Although the document
was written to make measurements on soldering and
desoldering equipment, the measurement techniques can be
used for other electrical hand tools. The working part of AC
powered tools should be capable of providing a conductive
path to ground. New powered hand tools such as soldering
irons typically should have a tip to ground resistance of less
than 1.0 ohm.
NOTE: This resistance may increase with use but should be
less than 20.0 ohms for verification purposes.”
December 2012
Figure 1. Desco
19245 Low Resistance Tester
ANSI/ESD S6.1 – Grounding
“6.4.1
The resistance of the conductor from the groundable
point ground of any ESD technical element (e.g. worksurface,
floor, chair, wrist strap, etc.) to the common point ground or
common connection point shall not be greater than 1 ohm.
Where a resistor is used in the grounding conductor, the total
resistance shall include the value of the resistor.
6.4.2
The resistance of the conductor from the common point
ground to the AC equipment ground shall not be greater than
1 ohm.”
Packaging
1 Low Resistance Tester
1
Threaded Banana Plug
1 Threaded Needle Point
1 Alligator Clip
1 Banana Jack Outlet Adapter
1 Certificate of Calibration
Features and Components
TECHNICAL BULLETIN TB-3055
A. Selectable Test Ranges:
Select the appropriate range
for required test <1 OHM, <2 OHMs, and <20 OHMs.
B. Test Button:
Press and hold button to activate the tester.
C. Threaded Banana Plug/Needle Point:
Standard Kit
includes a banana plug and needle point adaptor.
D. Audio and Visual Test Indicators:
LED and buzzer Pass
result.
Figure 2. Low Resistance Tester features and
components
A B
C
D E
G
F
Made in the
United States of America
