Safety Precautions
The following safety precautions should be observed before using
[his product and any associated instrumeniarion. Although some in-
stmmen~s and accessories would normally be used with non-haz-
ardous voltages. rhere are situations where hazardous conditions
may be present.
This product is intended for use by qualified personnel who recog-
nize shock hazards and are familiar with the safety precaurions re-
quired to avoid possible injury Read the operating information
carefully before using the product.
The types of product users are:
Responsible body is Ihe individual or group responsible for the use
and maintenance of equipment, for ensuring rhat the equipment IS
operared within its specifications and operating limits. and for en-
surin~ rhat operators are adequately trained.
Operators use the product for its intended function. They must be
trained in electrical safety procedures and proper use of the instill-
n,ent. They must be protected from electric shock and contact with
hazardous live circuits.
Maintenance personnel perform routine procedures on the product
to keep it operating, for example, setting the line voltage or replac-
ing consumable materials. Maintenance procedures are described in
the manual. The procedures explicitly state if the operator may Peru
form them. Otherwise, they should be performed only by service
personnel.
Service personnel are trained to work on live circuits, and perform
safe installations and repairs of products. Only properly trained ser-
vice personnel may perform installation and service procedures.
Exercise extreme caution when a shock hazard is present. Lethal
voltage may be present on cable connector jacks or test fixtures. The
Am&an Xational Standards Institute (ANSI) states that a shock
hazard exists when vo,,age levels grearer than 30V RMS. 42.4V
peak, or 60VDC are present. A good safety practice is to expect
that hazardous voltage is present in any unknown circuit before
measuring.
Users of this product must be pnxecred from e,cc,ric shock at all
times. The responsible body must ensure lhar users are prevenred
access and/or insulated from every connection point. In some cases.
connections musk be exposed 10 polenrial human contacI. Producl
users in these circumsmnces must be rained IO protect themselves
irom the risk of electric shock. If the circuit is capable of operatins
BI or above 1000 VOIIS. no conductive part of the circuit may be
exposed.
As described in rhe International Eleclrotechnical Commission
(IEC) Standard IEC 664. digital multimeter measuting circuits
(e.g.. Keithley Models I75A, 199. 2000,200l. 2002, and 2010) are
Inslallation Category II. A,, orher i”strume”,s’ s;gnaI lerminals are
Installation Category I and must nor be connected to mains.
Do not connect switching cards direcdy 10unlimited power circuits~
They are intended to be used with impedance limited sources.
NEVER connect swiiching cards directly 10AC mains. When con-
necting sources to switching cards. install protective devices 10lim-
it fault currem and voltage to rhe card.
Before operating an ins,rumen,. make sure rhe line cord is conncct-
ed to a properly grounded power receptacle. lnrpcct the connccim~
cables, test leads. and jumpers for possible wear. cracks. or breaks
before each use.
For maximum safety, do not touch the product, test cables. or an)
orher instruments while power is applied IO the circuil under :es,.
ALWAYS remove power from ihe entire lest system and discharge
any capacitors before: connccring or disconnecting cables or jump-
ers, installing or removing switching cards. or making imemal
changes, such as installing or removmg]umpers.
Do not louch any objea rhat could provide a currcm path to the
common side of the circuit under rest or power line (earth) sround.
Always make measurements wirh dry hands while rrandinp on a
dry. insulated surface capable of wirhstanding [he voltage being
measured.
