Model 1747
Dual Range 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
Connect to safety earth ground using the wire recommended in the user
manual.
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 ................................................................ 5
3 Quick Reference .......................................................... 6
3.1 Front Panel ......................................................................................... 6
3.2 Rear Panel .......................................................................................... 7
4 Operating Instructions ................................................. 8
4.1 Instrument Hook-Up .......................................................................... 9
4.2 Typical Constant Voltage Operation ................................................. 11
4.3 Setting Current Limit ........................................................................ 12
4.4 Typical Constant Current Operation ................................................ 12
4.5 Constant Voltage/Constant Current Characteristic .......................... 13
4.6 Saving the Power Supply’s Current State ......................................... 14
4.7 Connecting Two Power Supplies in Series ....................................... 15
4.8 Connecting Two Power Supplies in Parallel ..................................... 15
5 Remote Operation ...................................................... 17
5.1 RS232 Configuration Overview ........................................................ 18
5.2 RS232 Commands ............................................................................ 18
5.3 Application Software ....................................................................... 20
6 Maintenance .............................................................. 21
6.1 Fuse Replacement............................................................................ 21
6.2 Adjustments ..................................................................................... 22
6.3 Calibration ....................................................................................... 22
6.4 Instrument Repair Service ............................................................... 27
7 Error Messages ........................................................... 28
7.1 Self-Test Errors ................................................................................. 28
7.2 Calibration Errors ............................................................................. 28
7.3 Command Errors .............................................................................. 29
8 Specifications ............................................................. 31
9 Service Information .................................................... 33
10 Limited Two-Year Warranty ........................................ 34
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2 Introduction
Description
The B&K Precision model 1747 is a general purpose dual range DC power source.
This power supply can output more voltage at a lower current or more current at
a lower voltage. The 1747 provides 0-60 V DC output, adjustable with both
coarse and fine voltage controls for precise setting. The current output for the
1747 is 0-10 A for the 0-35 V range, and 0-5 A for the 35-60 V range, adjustable
with both coarse and fine current controls .
The 1747 exhibits excellent regulation and low ripple characteristics. Its
mechanical configuration conserves bench space and allows for easy portability.
Additionally, the power supply can be operated locally from the front panel or
remotely through the RS -232 interface.
This power supply is well suited for a wide variety of electrical and electronics
applications in service shops, engineering labs, production facilities, school
laboratories, and home use.
Features
Low ripple and noise
Excellent regulation
Constant voltage (CV) and constant current (CC) mode operation
Two 4-digit LED displays provide good visibility in bright or low light
LED indication for CV and CC modes
Automatic recall of last settings on power up
RS-232 interface
Isolated output
Overload protection
Reverse polarity protection
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
5
3 Quick Reference
5 3 4 8 9
1 2 11
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6
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3.1 Front Panel
Figure 1 - Front Panel
INDICATORS
Either the CC or CV LED indicators will be lit whenever the unit is operating. The unit
automatically changes from CV to CC operation when the preset current limit is
reached.
1) CV (Constant Voltage) Indicator. The green LED is lit in constant voltage mode.
Unit regulates output voltage at the value set by voltage controls.
2) CC (Constant Current) Indicator. The red LED is lit in constant current mode. Unit
regulates output current at the value set by current controls.
3) Green LED Display. 4-digit display continuously monitors voltage.
4) Red LED Display. 4-digit display continuously monitors current.
VOLTAGE CONTROLS
5) Voltage Coarse Control. Coarse adjustment of output voltage. Read value on the
green LED display.
6) Voltage Fine Control. Fine adjustment of output voltage. Read value on the
green LED display.
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CURRENT CONTROL
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15
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7) Current Coarse Control. Coarse adjustment of current limit. Read value on the
red LED display.
8) Current Fine Control. Fine adjustment of current limit. Read value on the red LED
display.
POWER CONTROLS
9) Power ON-OFF Switch.
10) Output ON-OFF Switch.
OUTPUT TERMINALS
11) “-” Terminal (Black). Negative polarity output terminal.
12) GND Terminal. Earth and chassis ground.
13) “+” Terminal (Red). Positive polarity output terminal.
3.2 Rear Panel
Figure 2 - Rear Panel
14) Power Cord
15) Fuse
16) RS-232 Interface Connector
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4 Operating Instructions
Safety Precautions
Use only a polarized 3-wire AC outlet. This assures that the power supply chassis,
case, and ground terminal are connected to a good earth ground and reduces
danger from electrical shock.
There is little danger of electrical shock from the power supply output, which
produces a maximum of 60 volts dc. However, there may be great danger of
electrical shock if the power supply output is connected to an external high
voltage. Some equipment being powered may contain high voltage and present a
shock hazard. Observe caution. If the power supply output is floated (referenced
to a voltage rather than earth ground) turn off the power supply and the
equipment under test when making connections. Never float the power supply to
a potential greater than 100 volts peak with respect to earth ground .
Equipment Precautions
Avoid using the power supply in ambient temperatures above +40° C. Always
allow sufficient air space around the heat sink at the rear of the power supply for
effective radiation to prevent internal heat build-up.
Although the power supply is protected against reverse polarity damage, the
circuit being powered may not include such protection. Always carefully observe
polarity; incorrect polarity may damage the equipment under test.
Do not exceed the voltage rating of the circuit being powered. Many transistors
and integrated circuits will not withstand voltage of 60 volts.
There is no need to worry about voltage spikes or overshoot damaging the
equipment under test. The voltage between the output terminals of the power
supply never exceeds the preset value as the POWER switch is turned on or off.
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4.1 Instrument Hook-Up
1. Turn off the power supply and the equipment to be powered during hook up.
2. Connect the positive polarity of the device being powered to the red (+)
terminal of the power supply.
3. Connect the negative polarity of the device being powered to the black ( -)
terminal of the power supply.
4. Figure 3 illustrates the grounding possibilities.
a. If the negative polarity of the equipment or circuit being powered is also
the chassis or common, it may be grounded to earth by strapping the black
(-) terminal to the green ( ) terminal as shown in Figure 3A.
b. Similarly, the positive polarity can be grounded by strapping the red (+)
terminal to the green ( ) terminal as shown in Figure 3B.
c. If an earth ground reference is not required, the configuration of Figure 3C
may be used. The scheme in Figure 3C should also be used where it is not
known whether the chassis is common with either the positive or negative
polarity.
d. If the chassis or common of the equipment being powered is separate
from both the positive and negative polarity power inputs, use the
connection shown in Figure 3D.
6. Observe proper polarity. If the circuit being powered is not equipped with
reverse polarity protection, damage to the circuit can result from reverse
polarity. Use color coded hook -up leads, for convenience in identifying
polarity, red for (+) and black for (-).
7. Make sure that the hook-up leads offer sufficient current capability and low
resistance between the power supply and the circuits being powered.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
9
Figure 3 (A and B) - Grounding Possibilities
Figure 3 (C and D) - Grounding Possibilities
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