BK Precision 5105B, Instruction Manual, Page: 6 / 48

6
Subject to change without notice
prior to connecting any signals. It is prohibited to separate
the safety ground connection.
Most electron tubes generate X rays; the ion dose rate of this
instrument remains well below the 36 pA/kg permitted by law.
In case safe operation may not be guaranteed do not use the
instrument any more and lock it away in a secure place.
Safe operation may be endangered if any of the following
was noticed:
– in case of visible damage.
– in case loose parts were noticed
– if it does not function any more.
– after prolonged storage under unfavourable conditions
(e.g. like in the open or in moist atmosphere).
– after any improper transport (e.g. insufficient packing not
conforming to the minimum standards of post, rail or
transport firm)
Proper operation
Please note: This instrument is only destined for use by
personnel well instructed and familiar with the dangers of
electrical measurements.
For safety reasons the oscilloscope may only be operated from
mains outlets with safety ground connector. It is prohibited
to separate the safety ground connection. The plug must be
inserted prior to connecting any signals.
CAT I
This oscilloscope is destined for measurements in circuits not
connected to the mains or only indirectly. Direct
measurements, i.e. with a galvanic connection to circuits
corresponding to the categories II, III, or IV are prohibited!
The measuring circuits are considered not connected to the
mains if a suitable isolation transformer fulfilling safety class
II is used. Measurements on the mains are also possible if
suitable probes like current probes are used which fulfil the
safety class II. The measurement category of such probes must
be checked and observed.
Measurement categories
The measurement categories were derived corresponding to
the distance from the power station and the transients to be
expected hence. Transients are short, very fast voltage or cur-
rent excursions which may be periodic or not.
Measurement cat. IV:
Measurements close to the power station, e.g. on electricity
meters
Measurement cat. III:
Measurements in the interior of buildings (power distribution
installations, mains outlets, motors which are permanently
installed).
Measurement cat. II:
Measurements in circuits directly connected to the mains
(household appliances, power tools etc).
Environment of use.
The oscilloscope is destined for operation in industrial,
business, manufacturing, and living sites.
Important hints
Please check the instrument for mechanical damage or loose
parts immediately after unpacking. In case of damage we
advise to contact the sender. Do not operate.
List of symbols used:
Consult the manual High voltage
Important note Ground
Positioning the instrument
For selection of the optimum position in use the instrument
may be set up in three different positions (see pictures C,D,E).
The handle will remain locked in the carrying position if the
instrument is positioned on its rear feet.
Move the handle to the instrument top if the horizontal
operating position is preferred (See picture C). If a position
corresponding the picture D (10 degrees inclination) is desired
move the handle from the carrying position A towards the
bottom until it engages and locks. In order to reach a position
with still greater inclination (E shows 20 degrees) unlock the
handle by pulling and move it further into the next locking
position. For carrying the instrument in the horizontal position
the handle can be locked horizontally by moving it upwards as
shown in picture B. The instrument must be lifted while doing
this, otherwise the handle will unlock again.
Safety
The instrument fulfils the VDE 0411 part 1 regulations for
electrical measuring, control and laboratory instruments and was
manufactured and tested accordingly. It left the factory in perfect
safe condition. Hence it also corresponds to European Standard
EN 61010-1 resp. International Standard IEC 1010-1. In order to
maintain this condition and to ensure safe operation the user is
required to observe the warnings and other directions for use in
this manual. Housing, chassis as well as all measuring terminals
are connected to safety ground of the mains. All accessible metal
parts were tested against the mains with 2200 V
DC
. The instrument
conforms to safety class I.
The oscilloscope may only be operated from mains outlets
with a safety ground connector. The plug has to be installed
I m p o r t a n t h i n t s
STOP