SCS CTC334-T User Manual

USER GUIDE TB-9026
Ground Man Plus Ground Monitor
Operation and Maintenance
Figure 1. Ground Man Plus Ground Monitor.
Description

Overview

The SCS Ground Man Plus Ground Monitor can be
used at work areas or locations to monitor the ground
impedance of process tools including, but not limited to
semiconductor, disk drive and flat panel environments.
Ground Impedance Monitoring can be used for up to
three points for metal ground 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 unit incorporates green and red LEDs and audible
alarms.
The Ground Man Plus Ground Monitor is available in two
models:
Item Description
CTC334-WW Ground Man Plus Ground Monitor,
with World Wide Power Adapter
CTC334-T Ground Man Plus Ground Monitor,
without Power Adapter
SCS offers the following accessories for the Ground
Man Plus Ground Monitor:
Item Description
2368 Dual Conductor Fabric Wrist Band,
Adjustable
2360 Dual Conductor Ground Cord, Coiled, 5ft.
2370 Dual Conductor Ground Cord, Coiled, 10ft.
CTE701 Workstation Monitor Checker
CTA251 Replacement Jack PCB, Ground Man Plus
TB-9026 Page 1 of 6
September 2015
SCS - 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:
Packaging
1 Ground Man Plus Ground Monitor
1 Monitor Ground Cord (Green and Yellow)
1 Power Adapter, 12VDC, with interchangeable plugs
(North America, UK/Asia, Europe) (CTC334-WW only)
1 Certificate of Calibration

Ground Impedance Monitor

Continuously monitors for ground impedance on three
separate channels that are connected to three process
tools. The alarm level is set the same for all channels.

Output Signal

An output signal is available for connecting to the tool's
computer or PLC. The 5V signal is either logic 1 or 0 for
indicating the monitored ground resistance/impedance
conditions and for the wrist strap.
Voltage on Person Wrist Strap Monitor
The Ground Man Plus Ground Monitor has a feature
that allows continuous monitoring of voltage on a person
through a dual conductor wrist band assembly.

Performance

Impedance Alarm Level

The alarm level can be preset from 1 to 20 ohms (from
1 to 10 ohms in increments of 1 ohm and from 10 to 20
ohms in increments of 2 ohms) by selecting through a
combination of LED patterns indicated on the front on
the unit. All three monitoring lines are set to the same
selected impedance value.
If the measured impedance on a line is lower than the
setting, a green LED will remain illuminated for that
line(s). If the impedance is higher than the preset level, a
red LED and audible alarm are activated for that line(s).
If the impedance level remains above the preset alarm
level, the red LED and audible sound remains on.
The SCS Ground Man Plus Ground Monitor only
monitors proper connection to ground. The monitored
equipment must be properly ground by itself. A wire must
be attached from the Ground Man Plus Ground Monitor
(GND terminals) to approved ground points to monitor
grounding of process tools correctly.

Output Signal Level

The output connector provides a logic 1 (+5V) when all
grounds are within limits and the unit is powered on. If
any of the monitored grounds fail, a wrist strap fails, or
power to the unit is lost, the output is logic 0 (0V).
Person Voltage And Resistance Monitor
The alarm level is monitored when a person is wearing
a dual conductor wrist strap assembly and plugged into
the front jack. There is a short hold on the body voltage
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