Desco 19239, 19242 Installation, Operation And Maintenance Manual

Page 1

TECHNICAL BULLETIN TB-3072

Mini Monitor Installation, Operation and Maintenance

Wave Distortion Technology is the Most Reliable Technology for the Continuous Monitoring of Single-Wire (Conductor) Wrist Straps

“Wave Distortion” or vector impedance works by applying a continuous test voltage of 1.2 volts peak-to-peak at 1 to 2 microamperes (0.000002 amperes) to the wrist strap that is connected to the continuous or constant monitor. The test voltage creates a sine wave that the monitor circuit compares to established patterns. By monitoring the “distortions”, or shape of the sine wave, Wave Distortion Technology determines if the monitored circuit is complete - the operator is in the circuit and the total equivalent DC resistance is within specifications. Wave Distortion Technology produces a very fast alarm time (<50 milliseconds) and minimal false alarms.

ANSI/ESD S20.20 section 7.3 states “Compliance verification records shall be established and maintained to provide evidence of conformity to the technical

Figure 1. Desco Mini Monitor

Description

The Desco Mini Monitor is a single workstation continuous monitor. It continuously monitors the path-to-ground integrity of one operator and one ESD worksurface. The Mini Monitor eliminates the need for periodic testing and record keeping of wrist straps.

requirements.” Per ANSI/ESD S1.1 Annex A.3 Daily (wrist strap system) testing may be omitted if constant monitoring used.” Per ESD Handbook ESD TR 20.20 section 5.3.2.4.4 “Typical Test programs recommend that wrist straps that are used daily should be tested daily. However, if the products that are being produced are of such value that knowledge of a continuous, reliable ground is needed, and then continuous monitoring should be considered or even required.”

Made in the

United States of America

The Mini Monitor is designed with Wave Distortion Technology which provides stable continuous monitoring of the path-to-ground and presence of 1 megohm resistance of an operator’s wrist strap. Audio and visual alarms activate (in less than 50 milliseconds) when the operator unintentionally disconnects from the monitor or the wrist strap connection points are intermittent. The Mini Monitor also serves as a ground point for an ESD worksurface and monitors for a path-to-ground of less than 500 megohms. All Mini Monitors are calibrated to NIST standards and include a certificate.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Website: Desco.com

The Mini Monitor and its accessories are available as the following item numbers:

Item Description

19239 Mini Monitor, Black, North America

19242 Mini Monitor, Blue, with Jewel® Wrist Strap,

North America

19243 Mini Monitor, Black, Universal Power Adapter

19258 Power Adapter, 100-240VAC Input, 24VDC

150mA Output, IEC Inlet

19260 Power Adapter, 100-240VAC Input, 24VDC

150mA Output, North America Plug

98220 Calibration Unit, for Wave Distortion Monitors

Packaging

1 Mini Monitor 1 09100 Jewel® Elastic Wrist Strap (19242 only) 2 Push and Clinch Snaps 1 Power Adapter, 24VDC 1 Certificate of Calibration

TB-3072 Page 1 of 4

April 2017

Employee Owned

Page 2

Features and Components

A. Power Jack: Connect the included 24VDC power

adapter here.

B. Operator LEDs: Illuminates green when the operator is properly grounded. Illuminates solid red and audible alarm sounds when the operator is not properly

grounded.

C. Worksurface LEDs: Illuminates green when the worksurface is properly grounded. Illuminates red and audible alarm sounds when the worksurface is not properly grounded.

D. Park Snap: Allows the operator to disconnect (and park) a wrist strap when leaving the workstation, without creating a false alarm. Touch the park snap and the monitor's audible alarm will disable for 6 seconds. Use

this time to disconnect the wrist cord from the wristband, and attach it to the park snap or remove the banana plug from the jack. Upon returning to the workstation and disconnecting the wrist cord from the park snap, the operator has 6 seconds to reconnect the wrist cord to a worn wristband before activating the alarm.

E. Monitored Operator Jack: Insert the single-wire

wrist cord here to monitor the operator's connection to ground.

F. 10mm Ground Snap: Connects the worksurface mat

to electrical ground.

G. 10mm Worksurface Monitor Snap: Verifies that the worksurface's path-to-ground is <500 megohms.

Installation

1. Remove the Mini Monitor from the carton, and inspect for damage.

2. Determine the mounting location of the Mini Monitor. It is normally installed toward the front edge of a workstation where its LEDs can be visible to the operator. Install the two included push and clinch snaps to the worksurface mat.

Worksurface Mat

Push and Clinch Snaps

Figure 2. Mini Monitor features and components

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Website: Desco.com

TB-3072 Page 2 of 4

1-5/16"

Figure 3. Installing the push and clinch snaps to the front edge of a worksurface mat

Employee Owned

Page 3

3. Align the two snaps underneath the Mini Monitor to the two snaps on the worksurface mat. Apply downward force on the monitor once aligned to snap the Mini Monitor into place.

6. Connect the power adapter to the power jack located on the top-side of the Mini Monitor. Route the wire from the supply to a nearby AC outlet and plug it into the outlet. Make sure the voltage and frequency match those listed on the power supply. The Mini Monitor is now powered, and the Micastat® laminate is now grounded.

Operation

1. Fit the wristband snugly onto the wrist.

2. Snap the wrist cord to the wristband.

Push and

Clinch Snaps

Worksurface Mat

Figure 4. Connecting the Mini Monitor to the push and clinch snaps on a worksurface mat

4. Locate an appropriate AC outlet nearby the Mini Monitor, and test it for proper wiring and grounding prior to use. The Desco AC Outlet Analyzer or similar test equipment may be used to verify the outlet’s functionality. Use item number 98132 for 120VAC North American outlets and item number

98131 for 220VAC UK outlets.

5. Connect the power adapter to the power jack located on the top-side of the Mini Monitor. Route the wire from the supply to the tested AC outlet, and plug it into the outlet.

Installation onto Micastat® Laminate

Materials Needed: 2 14244 Micastat® Flush Mount Ground Inserts 1 14242 Micastat® Flush Mount Insert Tool 1 09857 10mm Socket and Rivet (100 per pack) 2 8-32 Button Cap Screws

3. Plug the wrist cord into the operator jack. The green operator LED will illuminate. This indicates that the operator is properly grounded.

4. If this does not happen, examine the wrist cord for continuity or damage and the wristband to ensure that it fits securely. If you have dry skin, apply an approved dissipative hand lotion such as Menda

Reztore™ ESD Hand Lotion.

5. When leaving the workstation, first touch the monitor's park snap. The monitor's audible alarm will disable for 6 seconds. Use this time to disconnect the wrist cord from the wristband and attach it to the park snap without sounding a false alarm.

6. Upon returning to the workstation and disconnecting the wrist cord from the park snap, the monitor will provide 6 seconds for the operator to reconnect the wrist cord to a worn wristband before sounding the monitor's alarm.

1. Install the two flush mount ground inserts into the Micastat® laminate. Space the inserts as shown in Figure 3.

2. Once the ground inserts are installed, remove the 8-32 screws that were supplied with the kits.

3. Place 10mm snap sockets on top of the installed brass ground inserts.

4. Screw the 10mm snap sockets into place on the ground inserts using the 8-32 button cap screws.

5. Align the two snaps underneath the Mini Monitor to the two snaps on the Micastat® laminate. Apply downward force on the monitor once aligned to snap the Mini Monitor into place.

DESCO WEST - 3651 Walnut Avenue, Chino, CA 91710 • (909) 627-8178

DESCO EAST - One Colgate Way, Canton, MA 02021-1407 • (781) 821-8370 • Website: Desco.com

TB-3072 Page 3 of 4

Figure 5. Using the Mini Monitor

Employee Owned

Page 4

Calibration

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, Desco recommends that calibration be performed annually.

Use the Desco 98220 Calibration Unit for Wave Distortion Monitors to perform periodic verification (once every 6-12 months) of the Mini Monitor. The Calibration Unit can be used to check the test limits of the Mini Monitor without removing it from the workstation.

See TB-2082 for more information.

Figure 6. Desco 98220 Calibration Unit for Wave Distortion Monitors

Specifications

Input Voltage and Frequency (External Adapter)

Operating Temperature 50 to 95°F (10 to 35°C)

Environmental Requirements

Dimensions 2.77" L x 2.08" W x .90" H

Weight 0.1 lbs. (0.05 kg)

Operator Test Range* 500 kilohms to 10 megohms

Worksurface Test Limit**

Operator Test Voltage 1.2V peak-to-peak @ 1.2µA,

Worksurface Test Voltage

Alarm Response Time <50 ms

Country of Origin United States of America

AC/DC Power Adapter

Power Input: 100-240VAC, 50/60 Hz

Power Output: 24VDC @ 150mA

Cable Length: 5 ft. (1.5 m)

Indoor use only at altitudes less than 6500 ft. (2 km)

Maximum relative humidity of 80% up to 85°F (30°C) decreasing linearly to 50% @ 85°F (30°C)

(70 mm x 53 mm x 23 mm)

impedance

500 megohms (±20%)

open circuit

5 to 7.5V, open circuit

*This cannot be verified with standard DC test equipment. The continuous monitor is an impedance sensing device, and the limits are determined by the magnitude and angle of the impedance.

**The worksurface mat must have a conductive layer such as Dual Layer Rubber or Dissipative 3-Layer Vinyl with conductive buried layers. Desco workstation monitors are not recommended for use with homogeneous matting.

TB-3072 Page 4 of 4

Employee Owned