TB-9031
Page 2 of 4
© 2015 DESCO INDUSTRIES, INC.
Employee Owned
SCS
- 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:
StaticControl.com
• Connect banana end of the black grounding cable of
the Workstation Monitor Checker into the Reference
Ground jack of the Workstation Monitor Checker and
the alligator clip end of this cable to a ground terminal of
the monitor under test.
• Turn the Workstation Monitor Checker on.
Metal Ground
This test verifies proper operation of your monitor on
metal ground monitoring as well as EMI detection.
Settings – Ground Resistance
Setup switches allow you to set the parameters in
accordance with your specifications. Metal ground
impedance setting is done using dip switches 5-8.
Pressing a “Fail” push-button switch will result in
resistance that is 1 ohm higher than set above; pressing
the “Pass” push-button switch will result in resistance that
is 1 ohm lower. For example, if your factory is using 10
ohms as the specification for ground impedance, then the
monitor set to 10 ohms should pass at 9 ohms and fail at
11 ohms.
EMI
The Workstation Monitor Checker provides high frequency
signal to test EMI detection threshold. EMI level is set
using dip switch 9. The Workstation Monitor Checker
provides two different levels of high frequency signal
-- “elevated” and “normal.” In position 1 the EMI level is
“elevated,” in position 0 the level is “normal.” Pressing
“High” push button switch will result in high signal level
within its range, pressing “Low” push button will result in
low signal within its range.
Note: The internal EMI generator drive may be insufficient
to drive extremely low load, such as 0 or 1 ohm.
Procedure – Metal Grounds
• Plug banana end of red cable of the Workstation
Monitor Checker into the Ground Under Test jack of the
Workstation Monitor Checker.
• Plug the thin tip of red cable into the ground terminal of
your monitor. Make sure that the contact is good.
• Press the “Fail” button on the Workstation Monitor
Checker. Ground monitor shall indicate failure (typically,
red light on the monitor). A momentary “blink” of pass
light on the monitor (typically green) when the button is
pressed is acceptable.
• Press the “Pass” Metal Ground button on the
Workstation Monitor Checker. Ground monitor shall
indicate good ground (typically green light on the
monitor).
• While keeping the “Pass” Metal Ground button pressed,
simultaneously press EMI “High” button. On the Ground
Master Equipment Ground Monitor you should see
green light indicating good ground connection and
blinking red light indicating presence of EMI. On the
WS Aware Dual Workstation Monitor the ground light
should be blinking yellow. Release “High” EMI button
and press “Low” EMI button while keeping “Pass” Metal
Ground button pressed. No EMI indication should be
present on the monitor.
Resistance, Ohms
5
6
7
8
1
1
1
1
1
2
0
1
1
1
3
1
0
1
1
4
0
0
1
1
5
1
1
0
1
6
0
1
0
1
7
1
0
0
1
8
0
0
0
1
9
1
1
1
0
10
0
1
1
0
11
1
0
1
0
12
0
0
1
0
13
1
1
0
0
14
0
1
0
0
15
1
0
0
0
16
0
0
0
0
Switch Position
Figure 3. Metal ground contacts on the CTC061 WS
Aware Monitor