1. Introduction
The Desco 19341 Mini Continuous Monitor is designed to provide continuous monitoring of the path-to-ground integrity for one operator and one ESD worksurface. This device utilizes Wave Distortion Technology to ensure reliable and stable monitoring, activating audio and visual alarms within 50 milliseconds if a disconnection or intermittent connection occurs. The illuminated enclosure enhances visibility of the monitor's status for both the operator and supervisor. All Desco Mini Monitors are calibrated to NIST standards, ensuring accuracy and compliance with industry requirements.
2. Safety Information
Please read and understand all safety instructions before operating this device. Failure to follow these instructions may result in product damage or personal injury.
- Power Source: Use only the provided power adapter or a compatible power source as specified in the product documentation.
- Environment: Operate the monitor in a dry environment. Avoid exposure to liquids or excessive humidity.
- Maintenance: Refer to the maintenance section for cleaning and service instructions. Do not attempt to open or repair the unit yourself.
- Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.
3. Package Contents
Verify that all items are present in the package:
- Desco 19341 Mini Continuous Monitor
- AC Power Cord (North American Power Adapter for 19341)
Note: Other accessories such as Ring Magnets (19344) or a Wave Distortion Monitor Verification Tester (98221) are sold separately.
4. Setup Instructions
Follow these steps to set up your Desco 19341 Mini Continuous Monitor:
- Mounting the Monitor: Place the monitor in a convenient location on or near the ESD protected workstation. If mounting in areas without a worksurface, Desco 19344 Ring Magnets (sold separately) can be used.
- Connect Worksurface: Connect the worksurface ground cord to the designated worksurface jack on the monitor. Ensure the worksurface has a path-to-ground of less than 10 megohms.
- Connect Operator Wrist Strap: Plug the operator's single-wire wrist strap into the operator jack on the monitor. The wrist strap should have a 1 megohm resistance.
- Connect Power: Plug the AC power adapter into the monitor's power input, then plug the adapter into a suitable electrical outlet. The monitor will power on automatically.
Figure 1: Desco 19341 Mini Continuous Monitor showing its illuminated enclosure and connection ports for operator and worksurface.
5. Operating Instructions
The Desco 19341 Mini Continuous Monitor operates automatically once powered on and connections are established.
- Continuous Monitoring: The monitor continuously checks the path-to-ground for both the operator's wrist strap and the ESD worksurface.
- Wave Distortion Technology: This technology applies a continuous test voltage (1.2 volts peak-to-peak at 1 to 2 microamperes) to the wrist strap. By analyzing the waveform, it determines if the circuit is complete and if the total equivalent DC resistance is within specifications.
- Visual Indicators: The illuminated enclosure provides clear visual feedback on the status of the operator and worksurface connections. Refer to the monitor's front panel for specific indicator meanings (e.g., green for good, red for alarm).
- Audio Alarms: An audible alarm will sound in conjunction with a visual alarm if a fault is detected (e.g., operator disconnects, wrist strap failure, or worksurface resistance exceeds 10 megohms).
- Alarm Response: If an alarm activates, immediately check the operator's wrist strap connection, the wrist strap itself for damage, and the worksurface connection. Rectify any issues to restore proper ESD protection.
Compliance Note: Per ANSI/ESD S1.1 Annex A.3, daily wrist strap system testing may be omitted if constant monitoring is used. The ESD Handbook ESD TR 20.20 section 5.3.2.4.4 recommends continuous monitoring for high-value product manufacturing where a continuous, reliable ground is critical.
6. Maintenance
Proper maintenance ensures the longevity and accuracy of your Desco Mini Continuous Monitor.
- Cleaning: Clean the exterior of the monitor with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the unit is unplugged before cleaning.
- Calibration: The Mini Monitor is calibrated to NIST standards at the factory. Periodic re-calibration may be required depending on your quality control procedures. Contact Desco for calibration services.
- Verification: To verify the monitor's functionality, use a Desco 98221 Wave Distortion Monitor Verification Tester (sold separately). Follow the instructions provided with the verification tester.
- Inspection: Regularly inspect all cables and connections for signs of wear or damage. Replace any damaged components immediately.
7. Troubleshooting
If you encounter issues with your Desco 19341 Mini Continuous Monitor, refer to the following common problems and solutions:
- Monitor Does Not Power On:
- Ensure the power adapter is securely plugged into both the monitor and a working electrical outlet.
- Check the power cord for any visible damage.
- Test the electrical outlet with another device to confirm it is functional.
- Operator Alarm Activates:
- Verify the operator's wrist strap is properly worn and securely plugged into the monitor.
- Inspect the wrist strap and coil cord for breaks or damage. Replace if necessary.
- Ensure the operator's skin has good contact with the wrist strap.
- Worksurface Alarm Activates:
- Check that the worksurface ground cord is securely connected to both the worksurface and the monitor.
- Verify the worksurface material is ESD protective and has a resistance to ground of less than 10 megohms.
- Clean the worksurface if it is dirty, as contamination can affect conductivity.
If the problem persists after attempting these solutions, contact Desco customer support for further assistance.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | 19341 |
| Product Dimensions | 1 x 1 x 1 inches |
| Item Weight | 9.9 ounces |
| Manufacturer | Desco |
| Monitoring Technology | Wave Distortion Technology |
| Operator Monitoring | Single operator wrist strap (1 MΩ resistance) |
| Worksurface Monitoring | Worksurface path-to-ground (< 10 MΩ) |
| Alarm Response Time | Less than 50 milliseconds |
| Calibration | NIST Standards |
9. Warranty and Support
Warranty Information: Specific warranty details for the Desco 19341 Mini Continuous Monitor are typically provided with the product packaging or can be found on the official Desco website. Please retain your proof of purchase for warranty claims.
Customer Support: For technical assistance, troubleshooting beyond this manual, or to inquire about replacement parts and accessories, please contact Desco customer support. Visit the official Desco website for contact information and additional resources.