SCS CTC334-T User Manual Download Page 4

TB-9026 

Page 4 of 6

© 2015 DESCO INDUSTRIES, INC.

Employee Owned

SCS 

- 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website: 

StaticControl.com

Operations

Ground Impedance Monitor

Connect the ground wire to an electrical known good 

ground point.
Connect the output wire to the tool, if you intend to use 

it; otherwise leave it open.
Connect the ground monitor inputs to identified locations 

in a process tool or several pieces of other equipment. 

Make sure to connect the monitoring inputs to different 

physical locations than those points used for their 

grounding.

Person Voltage and Resistance Monitor

This is a feature of the Ground Man Plus Ground 

Monitor. Plug the dual conductor ground cord of the 

wrist strap into the jack on the front of the unit. If the 

wrist strap is worn properly, a green LED will come on; 

otherwise the red LED will be on. In order to provide 

good ground connection, the wrist strap must be worn 

tightly and the green light on the Ground Man Plus 

Ground Monitor is an indication of that.

If, for some reason, while properly connected, the 

operator develops excessive body voltage (in excess of 

± 2.5V in any polarity), the green LED may still be on, 

but the red LED will blink and the alarm sound will be 

on. No LED is on if a dual conductor ground cord is not 

plugged into the jack.

Maintenance

Procedures for Cleaning and Decontamination

Unplug power from the device. Clean using a dry brush 

or lint free cloth around the device. In case of contact 

malfunction, clean contacts using a contact cleaner or a 

brush and tighten all connections. Plug in the power.

Repairs and Servicing

Do not attempt to repair the product yourself. Contact a 

SCS sales representative or authorized dealer to request 

inspection and repair. Replace power supply if damaged 

using only SCS supplied parts. Other than replacement 

of remote jacks, do not attempt to service the device. 

There are no user-serviceable parts.

Device Calibration

Contact a SCS sales representative or authorized dealer 

to request for product calibration if needed.

Safety Information

Read, understand, and follow all safety information 

contained in these instructions prior to the use of this 

device. Retain these instructions for future reference.

Intended Use

The SCS Ground Man Plus Ground Monitor is intended 

for use by electrical assembly personnel to monitor 

ground impedance for process and equipment tools.
The Ground Man Plus Ground Monitor is both a wrist 

strap monitor and a ground monitor. It provides operator 

grounding, and can be used at work areas or locations 

to monitor the ground impedance of process tools in 

semiconductors, disk drives, flat panels, and EMS and 

other environments. Ground impedance monitoring can 

be used for up to three points for metal grounds within 

a tool. The Ground Man Plus Ground Monitor can also 

be used to monitor the resistance to ground and voltage 

level on a person. The units incorporate green and red 

LEDs and audible alarms.
The systems must be installed as specified in the user’s 

guide in an indoor commercial/industrial environment, 

and have not been evaluated for other uses or locations. 

If the equipment is used in a manner not specified by the 

manufacturer, the protection provided by the equipment 

may be impaired.

Warning:

 To reduce the risks associated with hazardous 

voltage and fire:

•  Do not use the power supply if damaged. Do not 

modify or attempt to service the power supply. Contact 

SCS authorized service center for replacement.

•  Replace power supply if damaged using only SCS 

supplied parts.

•  Do not attempt to service the SCS Ground Man Plus 

Ground Monitor, there are no user serviceable parts; 

Return to SCS for service.

•  Do not position the CTC334 Ground Man Plus Ground 

Monitor accessories or other equipment where 

unplugging the power supply is  

difficult.

•  Always locate the power source (socket or outlet) near 

the equipment. The power supply plug serves as the 

disconnect device.

•  Do not use the Ground Man Plus Ground Monitor  or 

its power supply outdoors or wet/humid environments.

•  Do not use the Ground Man Plus Ground Monitor or its 

power supply outside of the operating conditions listed 

in this user guide.

• Use only a dry cloth when cleaning.

Figure 4. Installing the Ground Man Plus Ground 

Monitor. 

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