BK Precision 9110, 9111 User Manual
Model: 9110, 9111
Multi Range DC Power Supply
USER MANUAL
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Safety Summary
The following safety precautions apply to both operating and maintenance personnel and must be
followed during all phases of operation, service, and repair of this instrument.
Before applying power to this instrument:
• Read and understand the safety and operational information in this manual.
• Apply all the listed safety precautions.
• Verify that the voltage selector at the line power cord input is set to the correct line
voltage. Operating the instrument at an incorrect line voltage will void the warranty.
• Make all connections to the instrument before applying power.
• Do not operate the instrument in ways not specified by this manual or by B&K Precision.
Failure to comply with these precautions or with warnings elsewhere in this manual violates the safety
standards of design, manufacture, and intended use of the instrument. B&K Precision assumes no
liability for a customer’s failure to comply with these requirements.
Category rating
The IEC 61010 standard defines safety category ratings that specify the amount of electrical energy
available and the voltage impulses that may occur on electrical conductors associated with these
category ratings. The category rating is a Roman numeral of I, II, III, or IV. This rating is also accompanied
by a maximum voltage of the circuit to be tested, which defines the voltage impulses expected and
required insulation clearances. These categories are:
Category I (CAT I): Measurement instruments whose measurement inputs are not intended to be
connected to the mains supply. The voltages in the environment are typically derived from a limitedenergy transformer or a battery.
Category II (CAT II): Measurement instruments whose measurement inputs are meant to be connected
to the mains supply at a standard wall outlet or similar sources. Example measurement environments
are portable tools and household appliances.
Category III (CAT III): Measurement instruments whose measurement inputs are meant to be connected
to the mains installation of a building. Examples are measurements inside a building's circuit breaker
panel or the wiring of permanently-installed motors.
Category IV (CAT IV): Measurement instruments whose measurement inputs are meant to be connected
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to the primary power entering a building or other outdoor wiring.
Do not use this instrument in an electrical environment with a higher category rating than what is
specified in this manual for this instrument.
You must ensure that each accessory you use with this instrument has a category rating equal to or
higher than the instrument's category rating to maintain the instrument's category rating. Failure to do
so will lower the category rating of the measuring system.
Electrical Power
This instrument is intended to be powered from a CATEGORY II mains power environment. The mains
power should be 120 V RMS or 240 V RMS. Use only the power cord supplied with the instrument and
ensure it is appropriate for your country of use.
Ground the Instrument
To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical safety
ground. This instrument is grounded through the ground conductor of the supplied, three-conductor AC
line power cable. The power cable must be plugged into an approved three-conductor electrical outlet.
The power jack and mating plug of the power cable meet IEC safety standards.
Do not alter or defeat the ground connection. Without the safety ground connection, all accessible
conductive parts (including control knobs) may provide an electric shock. Failure to use a properlygrounded approved outlet and the recommended three-conductor AC line power cable may result in
injury or death.
Unless otherwise stated, a ground connection on the instrument's front or rear panel is for a reference
of potential only and is not to be used as a safety ground.
Do not operate in an explosive or flammable atmosphere
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Do not operate the instrument in the presence of flammable gases or vapors, fumes, or finely-divided
particulates.
The instrument is designed to be used in office-type indoor environments. Do not operate the
instrument
• In the presence of noxious, corrosive, or flammable fumes, gases, vapors, chemicals, or
finely-divided particulates.
• In relative humidity conditions outside the instrument's specifications.
• In environments where there is a danger of any liquid being spilled on the instrument or
where any liquid can condense on the instrument.
• In air temperatures exceeding the specified operating temperatures.
• In atmospheric pressures outside the specified altitude limits or where the surrounding
gas is not air.
• In environments with restricted cooling air flow, even if the air temperatures are within
specifications.
• In direct sunlight.
This instrument is intended to be used in an indoor pollution degree 2 environment. The operating
temperature range is 0 °C to 40 °C and the operating humidity range is ≤ 80% relative humidity with no
condensation allowed.
Measurements made by this instrument may be outside specifications if the instrument is used in nonoffice-type environments. Such environments may include rapid temperature or humidity changes,
sunlight, vibration and/or mechanical shocks, acoustic noise, electrical noise, strong electric fields, or
strong magnetic fields.
Do not operate instrument if damaged
If the instrument is damaged, appears to be damaged, or if any liquid, chemical, or other material gets
on or inside the instrument, remove the instrument's power cord, remove the instrument from service,
label it as not to be operated, and return the instrument to B&K Precision for repair. Notify B&K
Precision of the nature of any contamination of the instrument.
Clean the instrument only as instructed
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Do not clean the instrument, its switches, or its terminals with contact cleaners, abrasives, lubricants,
solvents, acids/bases, or other such chemicals. Clean the instrument only with a clean dry lint-free cloth
or as instructed in this manual.
Not for critical applications
This instrument is not authorized for use in contact with the human body or for use as a component in a
life-support device or system.
Do not touch live circuits
Instrument covers must not be removed by operating personnel. Component replacement and internal
adjustments must be made by qualified service-trained maintenance personnel who are aware of the
hazards involved when the instrument's covers and shields are removed. Under certain conditions, even
with the power cord removed, dangerous voltages may exist when the covers are removed. To avoid
injuries, always disconnect the power cord from the instrument, disconnect all other connections (for
example, test leads, computer interface cables, etc.), discharge all circuits, and verify there are no
hazardous voltages present on any conductors by measurements with a properly-operating voltagesensing device before touching any internal parts. Verify the voltage-sensing device is working properly
before and after making the measurements by testing with known-operating voltage sources and test
for both DC and AC voltages. Do not attempt any service or adjustment unless another person capable
of rendering first aid and resuscitation is present.
Do not insert any object into an instrument's ventilation openings or other openings.
Hazardous voltages may be present in unexpected locations in circuitry being tested when a fault
condition in the circuit exists.
Fuse replacement
Fuse replacement must be done by qualified service-trained maintenance personnel who are aware of
the instrument's fuse requirements and safe replacement procedures. Disconnect the instrument from
the power line before replacing fuses. Replace fuses only with new fuses of the fuse types, voltage
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ratings, and current ratings specified in this manual or on the back of the instrument. Failure to do so
may damage the instrument, lead to a safety hazard, or cause a fire. Failure to use the specified fuses
will void the warranty.
Servicing
Do not substitute parts that are not approved by B&K Precision or modify this instrument. Return the
instrument to B&K Precision for service and repair to ensure that safety and performance features are
maintained.
Cooling fans
This instrument contains one or more cooling fans. For continued safe operation of the instrument, the
air inlet and exhaust openings for these fans must not be blocked nor must accumulated dust or other
debris be allowed to reduce air flow. Maintain at least 25 mm clearance around the sides of the
instrument that contain air inlet and exhaust ports. If mounted in a rack, position power devices in the
rack above the instrument to minimize instrument heating while rack mounted. Do not continue to
operate the instrument if you cannot verify the fan is operating (note some fans may have intermittent
duty cycles). Do not insert any object into the fan's inlet or outlet.
Do not short-circuit batteries
When using a DC load to discharge a battery, do not exceed the battery manufacturer's specified
maximum rate of discharge.
Use correctly sized wires
To connect the load to the power supply, use a wire diameter large enough to handle the maximum
continuous output short-circuit current of the power supply without the wire overheating.
For continued safe use of the instrument
• Do not place heavy objects on the instrument.
• Do not obstruct cooling air flow to the instrument.
• Do not place a hot soldering iron on the instrument.
• Do not pull the instrument with the power cord, connected probe, or connected test
lead.
• Do not move the instrument when a probe is connected to a circuit being tested.
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Compliance Statements
This product is subject to Directive 2002/96/EC of the
Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and other
European countries with separate collection systems)
European Parliament and the Council of the European Union
on waste electrical and electronic equipment (WEEE) , and in
jurisdictions adopting that Directive, is marked as being put
on the market after August 13, 2005, and should not be
disposed of as unsorted municipal waste. Please utilize your
local WEEE collection facilities in the disposition of this
product and otherwise observe all applicable requirements.
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