34405A User’s and Service Guide 3
Safety Information
Do not defeat power cord safety ground fea-
ture. Plug in to a grounded (earthed) outlet. 
Do not use product in any manner not speci-
fied by the manufacturer.
Do not install substitute parts or perform 
any unauthorized modification to the prod-
uct. Return the product to an Agilent Tech-
nologies Sales and Service Office for service 
and repair to ensure that safety features are 
maintained. 
Safety Symbols 
WARNING
Main Power and Test Input Dis-
connect: Unplug instrument from 
wall outlet, remove power cord, 
and remove all probes from all 
terminals before servicing. Only 
qualified, service-trained person-
nel should remove the cover from 
the instrument. 
WARNING
Line and Current Protection 
Fuses: For continued protection 
against fire, replace the line fuse 
and the current-protection fuse 
only with fuses of the specified 
type and rating.
WARNING
IEC Measurement Category II. The 
HI and LO input terminals may be 
connected to mains in IEC Cate-
gory II installations for line volt-
ages up to 300 VAC. To avoid the 
danger of electric shock, do not 
connect the inputs to mains for 
line voltages above 300 VAC. See 
"IEC Measurement Category II 
Overvoltage Protection" on the 
following page for further infor-
mation.
WARNING
Protection Limits: To avoid instru-
ment damage and the risk of elec-
tric shock, do not exceed any of 
the Protection Limits defined in 
the following section.
Earth Ground
Chassis Ground
Risk of electric shock
Refer to manual for addi-
tional safety information
CAT II (300V) IEC Measurement Category II. 
Inputs may be connected to 
mains (up to 300 VAC) under 
Category II overvoltage condi-
tions.
34405A users guide.book  Page 3  Saturday, September 2, 2006 3:38 PM