Chapter 5 Service And Maintenance; Safety - IET Labs, Inc. RLC Digibridge 1693 User And Service Manual

1693 RLC Digibridge

5.1 Safety

WARNING
These servicing instructions are
for use by qualified personnel only.
To avoid electrical shock, do not
perform any servicing, other than
that contained in the operating
instructions, unless you are qualified
to do so.
CAUTION
For continued protection against
fire hazard, replace fuse only with
same type and rating as shown on
rear panel and in parts list. Service
personnel, observe the following
precautions whenever you handle a
circuit board or integrated circuit in
this instrument.
Handling Electronic Devices that Might
Get Damaged by Static Electricity
Place instrument or system component to be serviced,
spare parts in conductive (anti-static) envelopes or
carriers, hand tools, etc., on a work surface defined
as follows. The work surface, typically a bench top,
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Chapter 5
SERVICE AND MAINTENANCE
must be conductive and reliably connected to earth
ground through a safety resistance of approximately
250 kilohms to 500 kilohms. Also, for personnel
safety, the surface must NOT be metal. (A resistivity
of 30 to 300 kilohms per square is suggested.) Avoid
placing tools or electrical parts on insulators, such
as books, paper, rubber pads, plastic bags, or trays.
Ground the frame of any line-powered equipment,
test instruments, lamps, drills, soldering iron s, etc.,
directly to earth ground. Accordingly, (to avoid short-
ing out the safety resistance) be sure that grounded
equipment has rubber feet or other means of insulation
from the work surface. The instrument or system com-
ponent being serviced should be similarly insulated
while grounded through the power-cord ground wire,
but must be connected to the work surface before,
during, and after any disassembly or other procedure
in which the line cord is disconnected.
Exclude any hand tools and other items that can gen-
erate a static charge . (Examples of forbidden items
are non-conductive plunger-type solder suckers and
rolls of tape.)
Ground yourself reliably, through a resistance , to the
work surface ; use, for example, a conductive strap or
cable with a wrist cuff . The cuff must make electrical
contact directly with your skin; do NOT wear it over
clothing. (Resistance between skin contact and work
surface through a commercially available personnel
grounding device is typically in the range of 250 kΩ
to 1 MΩ.
Service and Maintenance