USER GUIDE TB-9013 724 Workstation Monitor Installation, Operation and Maintenance Theory of Operation The SCS Workstation Monitor is designed to monitor the operation of the wrist strap grounding systems of two operators. To accomplish this, it uses a DC current source to measure a loop electrical resistance. The system uses a special wristband and ground cord that contain two independent elements. The Workstation Monitor employs two selectable test voltages (9 and 16 volts) and resistance limits (10 Megohms and 35 Megohms). It also monitors the grounding of up to two SCS work surfaces. The Workstation Monitor contains a current-limiting resistor. Resistance is monitored as the Test Voltage passes through one side of the wristband, through the skin of the wearer under the band, through the second side of the wristband, through the second conductor of the ground cord that contains a current-limiting resistor, and finally back to the monitor. Figure 1. SCS 724 Workstation Monitor NOTE: There is no power switch or LED power indication light. LED lights will illuminate, verifying power Description is on, once a wrist strap cord has been inserted. The SCS 724 Workstation Monitor is intended to monitor the operation of two wrist strap grounding systems and two work surfaces. This product has been designed and tested for use with SCS Dual Conductor Wrist Straps and SCS Work Surfaces Grounding Systems. If the equipment is used in a manner not specified in these instructions, the protection provided by the equipment may be impaired. Use in any other application has not been evaluated by SCS and may lead to an unsafe condition. Meets requirements of ANSI/ESD S20.20 and recommendations of ESD Handbook ESD TR20.20 which includes if the products that are being produced Figure 2. SCS 724 Workstation Monitor with 732 remote are of such value that knowledge of a continuous, (included) and 733 remote (not included) reliable ground is needed, and then continuous monitoring should be considered or even required. Packaging 1 724 Workstation Monitor 1 732 Operator Remote 1 Power Adapter, North America 1 Monitor Ground Cord 1 2380D Mat Monitor Cord 1 Two-Wire Connector 4 Mounting Screws 2 Wire Management Clips 1 Certificate of Calibration SCS - 926 JR Industrial Drive, Sanford, NC 27332 (919) 718-0000 Website: StaticControl.com 2015 DESCO INDUSTRIES, INC. TB-9013 Page 1 of 11 December 2015 Employee OwnedSelection of Test Voltage and Resistance High Operator Resistance Limit Resistance Low Operator Figure 3. Resistance and test voltage switches OK 1 OK 2 Resistance High The SCS Workstation Monitor allows for the selection Operator Operator Work Surface of test voltages (9V or 16V) and resistance limits (10 Megohms or 35 Megohms). The additional ranges have Figure 4. SCS 724 Workstation Monitor features and been added to accommodate global electrical static components discharge requirements. Selection of the operating parameters are left up to the users discretion. If the resistance of the wrist strap loop is higher than the selected range (10 Megohms or 35 Megohms) on the Workstation Monitor, an (OK) wrist strap green Operator Monitoring: Single and Dual lamp (1 or 2) extinguishes, and a high wrist strap red The wrist strap monitoring function is activated by lamp (H) illuminates with an audible alarm. This is an plugging a wrist strap dual conductor ground cord into indication of a high resistance in the wristband, or poor either one of the jacks on the SCS 732 or 733 Operator contact between arm and band. If the resistance in the Remote. If the resistance of the wrist strap loop is loop is under 1.5 Megohms, it is an indication of a low within the limits of the selected range (1.5 Megohms to resistance meaning one or both current-limiting resistors 10 Megohms or 1.5 Megohms to 35 Megohms) on the are bypassed. The low yellow lamp (L) will flash and an Workstation Monitor, the cord, the wristband, and the (OK) green lamp (1 or 2) will remain illuminated. contact to the arm of the wearer, it is considered to be functioning correctly. At this time, one of the (OK) green lamps (1 or 2) will be illuminated on the front of the Voltage on Operator When monitor. Connected to the SCS 724 The wrist strap of the second operator is measured in Workstation Monitor the same way. Operators are identified by the two (OK) There is a concern about the voltage that is applied green lamps (1 & 2). However, the same high wrist strap to an operator while they are connected to a monitor. red lamp (H) and low yellow (L) lamps illuminate when Some of todays electronic components are extremely a fault is detected. The green lamp that extinguishes sensitive to electrostatic discharge from a person (less identifies the operator that is experiencing the fault than 10 volts). The user should determine if these condition. voltages can damage the device being handled. The following chart for the Workstation Monitor illustrates the level of voltage that will appear on the operator under various resistance conditions. A low resistance condition also can be caused by touching a grounded object or by standing on a conductive surface. This may trigger the low resistance alarm on the SCS Workstation Monitor. SCS - 926 JR Industrial Drive, Sanford, NC 27332 (919) 718-0000 Website: StaticControl.com 2015 DESCO INDUSTRIES, INC. TB-9013 Page 2 of 11 Employee Owned