DESCO 19350 Touch Tester Instruction Manual

: June 12, 2024
: DESCO

Table of Contents

DESCO 19350 Touch Tester
Product Information
Product Usage Instructions
Description
Installation
Operation
Specifications
References
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DESCO 19350 Touch Tester

DESCO-19350-Touch-Tester-product

Pass Range: 750 kilohms to 10 megohms

Product Information

Technical Bulletin	TB-2004
Product Name	Touch Tester
Operation, Installation, and Calibration Instructions	Yes
Pass Range	750 kilohms to 10 megohms
Country of Origin	United States of America
Model Number	19350
Equipment Rating	AC Adapter: 120 Vac, 60 Hz, 6 W

Ground Touch Tester: 6.5 Vdc, 50 mA
Environmental Conditions| CAUTION: If this equipment is used in a manner not specified by
the manufacturer, the protection provided by the equipment may be
impaired.

Product Usage Instructions

Installation

The Touch Tester can be easily attached at the workstation using the following methods:

Attach the unit to a mat using the snap stud provided on the back of the unit. This configuration provides a common-point ground for both the mat and the wrist strap.
Use the adhesive-backed hook and loop fastener to mount the tester on a smooth surface such as a workstation leg or an upright support for shelving or lights. The snap does not have to be connected for proper grounding.

Testing a Wrist Strap

The wrist strap being tested can be plugged directly into the Touch Tester or any convenient common ground point. Follow these steps:

Ensure that both the Touch Tester and the wrist strap are connected to a common ground.
If multiple wrist strap wearers need to use the Touch Tester, make sure they can conveniently reach it.
When the Touch Tester and a Desco item 09740 (provides two banana jacks for grounding wrist straps) are tied to a common ground (utility ground), wrist straps plugged into the Desco item 09740 can also be tested.

Operation

Follow these steps to operate the Touch Tester:

Plug the Touch Tester’s power supply into a grounded outlet. The red LED will indicate that the unit is powered.
The utility ground is internally connected to the .395 (10mm)snap stud on the back of the unit and to the 2 banana jacks at the bottom edge of the tester.

Audible Option

If desired, the Touch Tester can provide an audible signal in addition to the visual test good indicator. To enable or disable the audible signal, follow these steps:

Unplug the power supply.
Locate the slide switch accessible through the hole on the back of the unit.
Use a small probing tool to actuate the switch, being careful to avoid internal damage.

Description

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 Touch Tester is an “on demand” wrist strap tester that also functions as a common-point ground for two wrist straps and a mat. When the wearer of a wrist strap touches the metallic surface of the Touch Tester, a path for current flow is completed from the wearer’s skin, through the wrist strap, to the metallic surface to ground. This action will cause the green “test good” LED to light (and the optional audible signal to sound) as long as the resistance of the circuit path is between 750k ohms and 10 megohms.

The wrist strap being tested may be plugged directly to the tester or any convenient common ground point. The wrist strap will test properly as long as both the Touch Tester and the wrist strap are connected to a common ground. Therefore, any number of wrist strap wearers may use the Touch Tester if they can conveniently reach it. Desco item 09740 provides two banana jacks for grounding wrist straps. When the Touch Tester and a 09740 are tied to a common ground (utility ground) wrist straps plugged into the 09740 can also be tested.

Installation

The Touch Tester is easily attached at the workstation. A snap stud at ground reference is provided on the back of the unit, allowing it to be snapped directly to a mat. In this configuration, the unit provides a common-point ground for both the mat and the wrist strap, and is easily accessible for frequent testing. A piece of adhesive-backed hook and loop fastener is provided for the user as an alternative mounting method preventing the tester from rotating.

The hook-and-loop type fastener also allows fast mounting to smooth surfaces. This method is convenient for mounting the tester on a workstation leg or on an upright support for shelving or lights. (Note – the snap does not have to be connected for proper grounding).

Equipment Rating

AC Adapter rated 120 Vac, 60 Hz, 6 W.
Ground Touch Tester rated 6.5 Vdc, 50 mA.

Environmental Conditions

Suitable for indoor use only at altitudes not exceeding 6500 ft. (2Km)
Temperature range of 41°F (5°C) to 104°F (40°C)
Maximum relative humidity of 80% up to 88°F (31°C) decreasing linearly to 50% @ 104°F (40°C)
Pollution degree 2 per IEC 664
Installation Category II

CAUTION: If this equipment is used in a manner not specified by the manufacturer, the protection provide by the equipment may be impaired.

Operation

When the Touch Tester’s power supply is plugged into a grounded outlet the red LED will be on, indicating that the unit is powered. The utility ground is internally connected to the .395” (10mm) snap stud on the back of the unit and to the 2 banana jacks at the bottom edge of the tester.

A wrist strap is plugged into one of the banana jacks or into any common grounding point. When the wearer of a wrist strap touches the metallic test surface, the green “test good” LED will light if the operator-to-ground resistance is between 750k ohms and 10 megohms.

Proper Ground

The integrity of the utility ground must be tested before the Touch Tester is plugged in. The Touch Tester utilizes the “green wire” ground as the static ground. Each outlet must be tested for proper grounding prior to use. Outlets can become ungrounded over time due to corrosion, wear, or vibration.
Desco recommends the 98132 AC Outlet Analyzer & Wrist Strap Tester when testing electrical outlets for proper grounding and wiring. See Technical Bulletin TB-2099 for more information.

Audible Option

If desired, the Touch Tester will augment the visual “test good” indicator with an audible signal. In the “on” position, the tester will beep when the green “test good” LED is on, thereby allowing the operator to frequently test the wristband and cord without having to look at the tester.
To enable/disable the signal, a slide switch is accessible through the hole on the back of the unit. First, unplug the power supply. Actuate the switch with a small probing tool, being careful to avoid internal damage.

Calibration

We recommend annual calibration of our testers. The model 19350 is calibrated to NIST traceable standards. Calibration may be performed to ensure that the tester is operating within limits. Desco offers a calibration unit that is specifically designed to simplify the calibration procedure. This unit is sold as item 07010. The 07010 comes calibrated to NIST traceable standards. Ask for Technical Bulletin TB-2039 for detailed procedure to calibrate the 19350.