Desco 19245 Bedienungsanleitung

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

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

Made in the

United States of America

Employee Owned

E. Low Battery LED: LED illuminates when the battery

needs to be replaced.

F. 6 Foot Coiled Cord: Insulation black color PVC

G. Banana Plug: Industrial Standard .175" (4.4 mm) Banana

Plug, fits banana jack ≥ .157".

Operation

USING THE TESTER

1. Use the slide switch to select a test range.

2. Connect the coil cord banana plug end to known ground.

Use adapters where needed. NOTE: The Desco Low

Resistance Tester may be used with an outlet polarity

checker such as the Desco 19219 to determine a known

ground.

3. Connect or touch the tester end to a banana jack or

other equipment that is being tested for resistance to

ground.

4. Press and hold the test button.

5. An audio and visual indication will activate for a PASS

condition.

6. A FAIL condition is indicated when the buzzer does not

sound and the PASS does not illuminate.

Figure 3. Testing ground points with the 19245 tester

Example of Test Range Uses

<1 OHM Range

- ESD Technical element Grounding Conductors:

Banana Jacks, Grounding Blocks, Mat Ground Cords

ANSI/ESD S6.1 Grounding, sections 6.4 Technical

Elements, 6.4.1, 6.4.2 and 6.4.3

- New AC Powered Hand Tools

ESD Handbook ESD TR20.20 section 5.5.2.2 Electrical

Hand Tools

<2 OHM

- Soldering Irons

ESD Handbook ESD TR20.20 section 5.5.2.2 Electrical

Hand Tools

- Other AC Powered Hand Tools

ESD Handbook ESD TR20.20 section 5.5.2.2 Electrical

Hand Tools

<20 OHM

- Soldering iron verification

ESD Handbook ESD TR20.20 section 5.5.2.2 Electrical

Hand Tools

- Auxiliary grounds (ground rods)

ANSI/ESD S20.20*

* ANSI/ESD S20.20 requires <25 ohms from the Auxiliary

Ground to the Equipment Grounding Conductor. Desco’s

Low Resistance Tester only tests to <20 ohms. In cases

of a no pass result with the Low Resistance Tester when

testing an Auxiliary Ground, an Ohm meter should used to

determine the actual resistance from the Auxiliary Ground to

the Equipment Grounding Conductor

Figure 4. Testing a soldering iron with the 19245 tester

Figure 5. Testing auxiliary ground with the 19245 tester

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

TestEquipmentDepot.com

Employee Owned

5. Re-assemble the tester.

Specifications

Output Voltage: 2.5 volts DC @ 10mA

Dimensions: 4.75" x 1.75" x .75" (12cm x 4.5cm x 2cm)

Operating Temperature: 0° - 40°C

Calibration

The Low Resistance Tester is calibrated to standards

traceable to NIST. Frequency of recalibratrion 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, we recommend that

calibration be performed annually.

Calibration is performed by placing various resistors between

the probe tip and the lead wire.

1. Attach the alligator clip to the lead wire.

2. Set the Low Resistance Tester to the 1 ohm test setting.

3. Attach the lead of a 1 ohm resistor to the alligator clip.

4. Firmly place the tester’s probe tip on the opposite resistor

lead.

5. Press and hold the test button. The PASS LED should

illuminate.

6. Repeat the procedure with a 1.2 ohm resistor. The PASS

LED should not illuminate.

7. Repeat this process with the ranges listed in the table

below. If the unit fails calibration, check and replace the

battery.

Test Range Setting PASS FAIL

1 ohm 0 to 1 ohm ≥ 1.2 ohms

2 ohms 0 to 2 ohms ≥ 2.2 ohms

20 ohms 0 to 20 ohms ≥ 22 ohms

Maintenance

BATTERY REPLACEMENT

1. Properly ground yourself using a wrist strap.

2. Remove the 2 screws located at the back of the tester.

Figure 6. Locating the enclosure screws

Figure 7. Removing the back cover

3. Remove and turn over the circuit board.

4. Locate and replace the battery (3 Volt; Model CR2032).

First, place

battery under

prongs

Next, press here to snap

battery in place

Figure 8. Replacing the battery

Employee Owned

Limited Warranty

Desco expressly warrants that for a period of one (1) year from the date of purchase, Desco Low Resistance Testers will be free of

defects in material (parts) and workmanship (labor). Within the warranty period, a credit for purchase of replacement Desco products,

or, at Desco’s option, the product will be repaired or replaced free of charge. If product credit is issued, the amount will be calculated by

multiplying the unused portion of the expected one year life times the original unit purchase price. Call Customer Service at 909-627-

8178 (Chino, CA) or 781-821-8370 (Canton, MA) for Return Material Authorization (RMA) and proper shipping instructions and address.

Include a copy of your original packing slip, invoice, or other proof of date of purchase. Any unit under warranty should be shipped

prepaid to the Desco factory. Warranty replacements will take approximately two weeks.

If your unit is out of warranty, Desco will quote repair charges necessary to bring your unit up to factory standards. Call Customer Service

at 909-627-8178 (Chino, CA) or 781-821-8370 (Canton, MA) for a Return Material Authorization (RMA) and proper shipping instructions

and address.

Warranty Exclusions

THE FOREGOING EXPRESS WARRANTY IS MADE IN LIEU OF ALL OTHER PRODUCT WARRANTIES, EXPRESSED AND IMPLIED,

INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH ARE SPECIFICALLY DISCLAIMED. The

express warranty will not apply to defects or damage due to accidents, neglect, misuse, alterations, operator error, or failure to properly

maintain, clean or repair products.

Limit of Liability

In no event will Desco or any seller be responsible or liable for any injury, loss or damage, direct or consequent, arising out of the use

of or the inability to use the product. Before using, users shall determine the suitability of the product for their intended use, and users

assume all risk and liability whatsoever in connection therewith.

99 Washington Street Melrose,

MA 02176Phone

781-665-1400 Toll Free

1-800-517-8431

Visit us at www.TestEquipmentDepot.com

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