14
Section 7.
Fault Conditions
(Refer to Fig. 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.
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.
Yellow Wrist Strap Lamp (L) with
no Audible Alarm
Caution
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.
Red Work Surface Lamp (M)
This indicates that a high resistance
condition (greater than 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.
