BK Precision 1900B, 1901B, 1902B Instruction Manual
Model 1900B, 1901B, 1902B
Switching DC Power Supply
INSTRUCTION MANUAL
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
1 Safety Summary
The following safety precautions apply to both operating and maintenance personnel and
must be observed during all phases of operation, service, and repair of this instrument. Before
applying power, follow the installation instructions and become familiar with the operating
instructions for this instrument.
GROUND THE INSTRUMENT
To minimize shock hazard, the instrument chassis and cabinet must be connected to
an electrical ground. This instrument is grounded through the ground conductor of
the supplied, three-conductor ac power cable. The power cable must be plugged
into an approved three-conductor electrical outlet. Do not alter the ground
connection. Without the protective ground connection, all accessible conductive
parts (including control knobs) can render an electric shock. The power jack and
mating plug of the power cable meet IEC safety standards.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of flammable gases or fumes.
Operation of any electrical instrument in such an environment constitutes a definite
safety hazard.
KEEP AWAY FROM LIVE CIRCUITS
Instrument covers must not be removed by operating personnel. Component
replacement and internal adjustments must be made by qualified maintenance
personnel. Disconnect the power cord before removing the instrument covers and
replacing components. Under certain conditions, even with the power cable
removed, dangerous voltages may exist. To avoid injuries, always disconnect power
and discharge circuits before touching them.
DO NOT SERVICE OR ADJUST ALONE
Do not attempt any internal service or adjustment unless another person, capable of
rendering first aid and resuscitation, is present.
DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT
Do not install substitute parts or perform any unauthorized modifications to this
instrument. Return the instrument to B&K Precision for service and repair to ensure
that safety features are maintained.
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WARNINGS AND CAUTIONS
WARNING:
Do not alter the ground connection. Without the protective ground
connection, all accessible conductive parts (including control knobs)
can render an electric shock. The power jack and mating plug of the
power cable meet IEC safety standards.
WARNING:
To avoid electrical shock hazard, disconnect power cord before
removing covers. Refer servicing to qualified personnel.
CAUTION:
Before connecting the line cord to the AC mains, check the rear panel
AC line voltage indicator. Applying a line voltage other than the
indicated voltage can destroy the AC line fuses. For continued fire
protection, replace fuses only with those of the specified voltage and
current ratings.
CAUTION:
This product uses components which can be damaged by electrostatic discharge (ESD). To avoid damage, be sure to follow proper
procedures for handling, storing and transporting parts and
subassemblies which contain ESD-sensitive components.
WARNING and CAUTION statements, such as the following examples, denote a
hazard and appear throughout this manual. Follow all instructions contained in
these statements.
A WARNING statement calls attention to an operating procedure, practice, or
condition, which, if not followed correctly, could result in injury or death to
personnel.
A CAUTION statement calls attention to an operating procedure, practice, or
condition, which, if not followed correctly, could result in damage to or destruction
of parts or the entire product.
SAFETY SYMBOLS
This symbol on an instrument indicates that the user should refer to the
operating instructions located in the manual.
Certification
We certify that this product met its published specifications at time of shipment from the
factory.
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Compliance Statements
Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and
other European countries with separate collection systems)
This product is subject to Directive 2002/96/EC of the 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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Contents
1 Safety Summary ........................................................................................ 1
2 Introduction .............................................................................................. 6
3 Controls and Indicators ............................................................................. 7
3.1 Front Panel ........................................................................................ 7
3.2 Rear Panel ......................................................................................... 8
4 Operating Instructions .............................................................................. 9
4.1 Using the Power Supply .................................................................. 10
4.1.1 Connection .............................................................................. 10
4.1.2 Self Test Sequence .................................................................. 10
4.1.3 Control Knobs .......................................................................... 12
4.1.4 Manually Zeroing Current Meter Offset ................................. 13
4.1.5 Using Both Main and Auxiliary Outputs .................................. 14
4.2 Control Modes ................................................................................ 14
4.2.1 Normal Mode .......................................................................... 15
4.2.2 Preset Mode ............................................................................ 15
4.2.3 Analog Remote Control Mode ................................................ 16
4.2.4 Set Mode ................................................................................. 16
4.3 Remote Sense ................................................................................. 18
4.3.1 Connection .............................................................................. 18
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4.3.2 Disconnection .......................................................................... 19
5 Remote Control ....................................................................................... 19
5.1 Analog Remote Control ................................................................... 20
5.1.1 Remote Control Connector Setup ........................................... 20
5.1.2 Using Two External Variable DC Voltage Sources ................... 21
5.1.3 Using Two 5 kΩ Variable Resistors .......................................... 23
5.1.4 Enable and Disable the Output ............................................... 24
5.2 PC Interface Control ........................................................................ 25
6 Faults and Troubleshooting .................................................................... 26
6.1 OVP: Overvoltage Protection ......................................................... 26
6.2 OTP: Overtemperature Protection ................................................. 26
6.3 OLP: Overload Protection ............................................................... 27
6.4 Upper Voltage Limit (UVL) and Upper Current Limit (UCL) ............ 28
6.5 Fuse Replacement ........................................................................... 29
7 Specifications .......................................................................................... 30
8 Certification ............................................................................................ 32
9 Service Information ................................................................................ 33
10 Limited Two-Year Warranty .................................................................... 34
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
5
2 Introduction
B&K Precision models 1900B, 1901B, and 1902B are laboratory grade switching mode
DC power supplies with high current output in a small form factor and lightweight
package. The 1900B Series provide different configurations of high output voltage or
high output current and make setting voltage and current levels fast and precise
through its dual action, course/fine rotary encoder control. In addition to its constant
voltage (CV) and constant current (CC) modes, the high efficiency DC power supply
offers a unique solution with its preset and analog remote control modes. Save up to
three different presets of voltage and current values for quick recall. The analog
remote control function allows the output power, voltage, and current to be adjusted
without touching the front panel of the power supply. A remote sense terminal
(model 1900B only) is also available for use to compensate for voltage drop across
load leads. These features make the 1900B Series suitable for a wide range of
applications including production testing, telecommunications, R&D, service, and
university labs.
Features
Automatic CV/CC crossover operation
Up to 60 A output current
Lightweight and compact
Rotary encoder control for precise voltage and current setting
3 user-defined voltage and current presets
Analog remote control function
Remote sense terminal (model 1900B only)
USB interface
Front panel auxiliary output
Overvoltage, overtemperature, and overload protection
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3 Controls and Indicators
3.1 Front Panel
Figure 1 - Front Panel
(1) LED panel meter display with CV/CC indicator
(2) Rear Control Indicator (lights up when using Preset/Remote Control/Set mode)
(3) Output Voltage Control Knob (control main and auxiliary output voltage)
(4) Output Current Control Knob (control main and auxiliary output current limit)
(5) Power ON/OFF Switch
(6) Auxiliary Output Terminal (max 5 A)
Note: Please see Section 4.1.5 for more details on using both main and
auxiliary output terminals together.
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3.2 Rear Panel
Figure 2 - Rear Panel
(7) Main Output Terminal (max 60 A for 1900B / 30 A for 1901B / 15 A for 1902B)
Note: Please see Section 4.1.5 for more details on using both main and
auxiliary output terminals together.
(8) Remote Sense Terminal (model 1900B only)
(9) Mode Selection Switch (Normal, Preset, Remote Control, Set Modes)
(10) Recall Preset Selection Switch
(11) Analog Remote Control Terminal
(12) Cooling Fan Air Intake Grille
(13) AC Input Plug and Fuse Compartment
(14) USB Port (for PC remote control)
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4 Operating Instructions
Model Number
Output Voltage Range
Total Rated Current
1900B
1 – 16 V
0 – 60 A
1901B
1 – 32 V
0 – 30 A
1902B
1 – 60 V
0 – 15 A
Safety Precautions
● Never short the remote sense terminal.
● This power supply is for indoor use only.
● Do not expose the power supply to sun, high humidity, or dusty
environments.
● Never remove the metal cover of the power supply while AC power is
connected.
● Never touch the unit when your hands are wet.
● Never block the ventilation slots and cooling fan air intake window.
● Never attempt to repair the power supply. Incorrect re-assembly may
result in a risk of electric shock or fire.
● Never use the power supply for a load requiring higher current than the
designed value. Otherwise it may damage the power supply.
● Place the power supply on a flat surface with sufficient clearance and dry,
dust-free surroundings for ventilation.
This series has three models with different output voltage and current ranges. Make
sure you have purchased the correct one.
Table 1 - Model Table
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
9
Front Panel Display
Test
Show software version
4.1 Using the Power Supply
4.1.1 Connection
To connect the equipment to the power supply, follow the steps below.
1. Check the rating label of the power supply and confirm that it complies with
your AC mains voltage.
2. Connect the power supply to the AC mains using the provided power cord
and make sure the Mode Selection Switch is in the Normal position.
3. Hook up the red (+) terminal to the positive polarity input of the equipment
and the black (-) terminal to the negative polarity input of the equipment.
4. Switch on the power supply first. The panel meter and green CV indicator
should light up again.
5. Switch on the equipment. The panel meter and green CV indicator should
still remain green.
6. When an operation is finished, switch off the equipment first and then
switch off the power supply.
4.1.2 Self Test Sequence
The power supply will perform a series of self checks when it is switched on. The
table below shows the self test sequence.
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Front Panel Display
Test
Segment check
Constant Voltage mode
indicator check
Constant Current mode
indicator check
Rear control indicator
check
Return to Constant
Voltage mode
Start power supply checks
Overvoltage protection
check
Overload protection check
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