16
SECTION 7
Fault Conditions
(Refer to Figure 3)
Red Wrist Strap Lamp (H) Accompanied by an Audible Alarm
This indicates that a high resistance condition
(greater than 10 Megohms or 35 Megohms)
exists for an operator or wrist strap assembly.
If two operators are connected to the monitor
the high condition is with the operator
whose green lamp has extinguished. Check
the operator for good contact between the
wrist and band. Check the ground cord and
connections for continuity. Some operators
have difficulty in providing sufficient
continuity to the wrist band due to dry skin or
arm hair. They may need to use an approved
skin moisturizer or reposition the wrist band
on the arm.
Yellow Wrist Strap Lamp (L) with no Audible Alarm
Red Work Surface Lamp (M)
This indicates that a high resistance condition (> 3.7 Megohms) exists across the
conductive layer of the work surface and/or the ground connections. Check the
work surface, ground cords, and the connections for continuity. Note the audible
alarm may also sound if selected.
Note: The operators may complain that
the alarm is sounding too often until
they learn to adjust the wrist band to
fit securely or apply an approved skin
moisturizer on a frequent basis. Please
remember that the monitor is informing
you that the operator is exceeding the
established static control requirement
for resistance to ground when wearing
a static protective wrist strap assembly.
These alarms alert the operator when
sensitive electronics are possibly being
exposed to static electricity. Prior to
incorporating the work station monitor
into your static control process, the
operator was unaware of these events.
NOTICE
This indicates that a low resistance condition (less than 1.5 Megohms) exists
between the operator and ground. One or both of the one megohm current-
limiting resistors are being bypassed. A low resistance condition can be
caused by touching a grounded object or by standing on a conductive surface.
