B+K precision 1688B User manual
Model 1685B, 1687B, 1688B
Switching DC Power Supply
INSTRUCTION MANUAL
1
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.
2
WARNINGS AND CAUTIONS
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.
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 electro-
static discharge (ESD). To avoid damage, be sure to follow proper
procedures for handling, storing and transporting parts and
subassemblies which contain ESD-sensitive components.
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.
4
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
5 Remote Control....................................................................................... 18
5.1 Analog Remote Control................................................................... 18
5
5.1.1 Using Two External Variable DC Voltage Sources................... 20
5.1.2 Using Two 5 kΩ Variable Resistors.......................................... 21
5.1.3 Enable and Disable the Output ............................................... 23
5.2 PC Interface Control........................................................................ 23
6 Faults and Troubleshooting .................................................................... 24
6.1 OVP: Overvoltage Protection......................................................... 24
6.2 OTP: Overtemperature Protection................................................. 24
6.3 OLP: Overload Protection............................................................... 25
6.4 Upper Voltage Limit (UVL) and Upper Current Limit (UCL) ............ 26
6.5 Fuse Replacement........................................................................... 27
7 Specifications.......................................................................................... 28
8 Certification ............................................................................................ 30
9 Service Information ................................................................................ 31
10 Limited Two-Year Warranty.................................................................... 32
6
2 Introduction
B&K Precision models 1685B, 1687B, and 1688B are laboratory grade switching mode
DC power supplies with high current output in a small form factor and lightweight
package. The 1685B Series provides various configurations of output voltage and
current, and makes setting voltage and current levels fast and precise through its
dual action, coarse/fine rotary encoder control knobs. 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. These features make the
1685B Series suitable for a wide range of applications including production testing,
telecommunications, R&D, service, and university labs.
Features
Automatic CV/CC crossover operation
Lightweight and compact
Rotary encoder control for precise voltage and current setting
Save up to 3 user-defined voltage and current presets for quick recall
PC software for remote control and external timed programming
Analog remote control function
USB interface
Front panel auxiliary output
Overvoltage, over temperature, and overload protection
7
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 more details on using both main and
auxiliary output terminals together.
8
3.2 Rear Panel
Figure 2 - Rear Panel
(7) Main Output Terminal (max 5 A for 1685B / 10 A for 1687B / 20 A for 1688B)
Note: Please see Section 4.1.5 for more details on using both main and
auxiliary output terminals together.
(8) Mode Selection Switch (Normal, Preset, Remote Control, Set Modes)
(9) Recall Preset Selection Switch
(10) Analog Remote Control Terminal
(11) Cooling Fan Air Intake Grille
(12) AC Input Plug and Fuse Compartment
(13) USB Port (for PC remote control)
This manual suits for next models
5
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