HP 1652B Getting Started Manual page 549

Safety Considerations
General
This is a Safety Class I instrument (provided with terminal for protective earthing). BEFORE
Operation
APPLYING POWERverify that the power transformer primary is matched to the available line
voltage, the correct fuse is installed, and Safety Precautions are taken (see the following warnings).
In addition, note the instrument's external markings which are described under "Safety Symbols."
General
l
Warnings and
Cautions
l
BEFORE SWITCHING ON THE INSTRUMENT, the protective earth terminal of the
instrument must be connected to the protective conductor of the (mains) powercord. The mains
plug shall only be inserted in a socket outlet provided with a protective earth contact. The
protective action must not be negated by the use of an extension cord (power cable) without a
protective conductor (grounding). Grounding one conductor of a two-conductor outlet is not
sufficient protection.
Servicing instructions are for use by service-trained personnel. To avoid dangerous electric shock,
do not perform any servicing unless qualified to do so.
If this instrument is to be energized via an auto-transformer (for voltage reduction) make sure
the common terminal is connected to the earth terminal of the power source.
Any interruption of the protective (grounding) conductor (inside or outside the instrument) or
disconnecting the protective earth terminal will cause a potential shock hazard that could result in
personal injury.
Whenever it is likely that the protection has been impaired, the instrument must be made
inoperative and be secured against any unintended operation.
Only fuses with the required rated current, voltage, and specified type (normal blow, time delay,
etc.) should be used. Do not use repaired fuses or short circuited fuseholders. To do so could
cause a shock or fire hazard.
Do not operate the instrument in the presence of flammable gasses or fumes. Operation of any
electrical instrument in such an environment constitutes a definite safety hazard.
Do not install substitute parts or perform any unauthorized modification to the instrument.
Adjustments described in the manual are performed with power supplied to the instrument while
protective covers are removed. Energy available at many points may, if contacted, result in
personal injury.
Any adjustment, maintenance, and repair of the opened instrument under voltage should be
avoided as much as possible, and when inevitable, should be carried out only by a skilled person
who is aware of the hazard involved.
Capacitors inside the instrument may still be charged even if the instrument has been
disconnected from its source of supply.
Safety Symbols
Instruction manual symbol. The product will be marked with this symbol when it is necessary for the
user to refer to the instruction manual in order to protect against damage to the product.
$
Indicates Hazardous Voltages
Earth terminal (sometimes used in manual to indicate circuit common connected to grounded chassis).
Warning
The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if
not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a
WARNING sign until the indicated conditions are fully understood and met.
Caution
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, practice, or the
like, which, if not correctly performed or adhered to, could result in damage to or destruction of part
or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully
understood or met.
. . .
III