B+K precision 1672 User manual

Model 1672 Triple Output Power Supply
Instruction Manual
99 Washington Street
Melrose, MA 02176
Fax [phone]
TestEquipmentDepot.com

Contents
Section Description Page No.
CONTENTS 1
1TEST INSTRUMENT SAFETY 2
2INTRODUCTION 3
2.1 INTRODUCTION 3
2.2 FEATURES 3
3Installation 4
3.1 INTRODUCTION 4
3.2 UNPACKING 4
3.3 INPUT POWER REQUIREMENTS 4
3.4 SYSTEM CONFIGURATION 5
3.5 INSTALLATION 5
3.6 OPERATING INSTRUCTIONS 5
4Setting the Output Voltage and Current 6
5Tracking Mode Operation 7
6Connecting Multiple Units and Fixed Output 8
7TECHNICAL SPECIFICATIONS 9
8CONTROLLS AND INDOCATORS 10
8.1 INTRODUCTION 10
8.2 UNPACKING 10
8.3 INPUT POWER REQUIREMENTS 11
8.4 PANEL LAYOUT 12
9MAINTENANCE 13
9.1 INTRODUCTION 13
9.2 PREVENTIVE MAINTENANCE 13
9.3 SERVICE INFORMATION 14
9.4 TEST EQUIPMENT REQUIRMENTS 15
10 CUSTOMER SUPPORT 16
11 WARRANTY INFORMATION 17
12 SERVICE INFORMATION 18
Manual de usuario 19-36
1

Section 1 - Test Instrument Safety
WARNING - Normal use of test equipment exposes you to a certain amount of danger
from electrical shock because testing must sometimes be performed where exposed
voltage is present. An electrical shock causing 10 milliamps of current to pass through
the heart will stop most human heartbeats. A Voltage as low as 35 volts dc or ac (rms.)
should be considered dangerous and hazardous since it can produce a lethal current
under certain conditions. Higher voltages pose an even greater threat because such
voltage can more easily produce a lethal current. Your normal work habits should in-
clude all accepted practices to prevent contact with exposed high voltage and to steer
current away from your heart in case of accidental contact with high voltage. You will
significantly reduce the risk factor if you know and observe the following safety precau-
tion.
1. Don’t expose high voltage needlessly. Remove housings and covers only when necessary.
Turn off equipment while making test connections in high voltage circuits. Discharge high volt-
age capacitors after removing power.
2. If possible, familiarize yourself with the equipment being tested and the location of its high
voltage points. However, remember that high voltage may appear at unexpected points in de-
fective equipment.
3. Use an insulated floor material or a large, insulated floor to stand on and an insulated work
surface on which to place equipment and make certain such surfaces are not damp or wet.
4. Use the time proven “one hand in the pocket” technique while handling an instrument probe. Be
particularly careful to avoid contacting a nearby metal object that could provide a good ground
return path.
5. When testing ac powered equipment, remember that ac line voltage is usually present on some
power input circuits such as the on-off switch, fuses, power transformer etc. any time the
equipment is connected to an ac outlet, even if the equipment is turned off.
6. Some equipment with a two-wire ac power cord, including some with polarized power plugs, is
the “hot chassis” type. This includes most recent television receivers and audio equipment. A
plastic wooden cabinet insulates the chassis to protect the customer. When the cabinet is
removed for servicing, a serious shock hazard exists if the chassis is touched. Not only does
this present a dangerous shock hazard, but damage to test equipment. Always connect an
isolation transformer between the ac outlet and the equipment under test. The B&K Precision
Model TR-110 or 1604A Isolation Transformer or Model 1653A or 1655A AC Power Supply is
suitable for most applications. To be on the safe side, treat all two-wire ac equipment as “hot
chassis” unless you are sure it is isolated chassis or an earth ground chassis.
7. On test instruments or any equipment with a 3-wire ac power plug, use only a 3-wire outlet.
This is a safety feature to keep the housing or other exposed elements at earth ground.
8. B&K Precision products are not authorized for use in any application involving direct contact
between our product and the human body or for use as a critical component in a life support
device or system. Here “direct contact” refers to any connection from or to our equipment via
any cabling or switching means. A “critical component” is any component of a life support
device or system whose failure to perform can be reasonably expected to cause failure of that
device or system or to affect its safety or effectiveness.
Never work all alone. Someone should be nearby to render aid if necessary. Training in CPR
(cardio-pulmonary resuscitation) first aid is highly recommended.
2

Section 2
Introduction
2.1 INTRODUCTION
2.2 FEATURES
2.1 INTRODUCTION
The Model 1672 is a Triple Output Regulated DC Power Supply that provides one
fixed output (5V/ 3A) and two variable outputs (0 – 32V/ 0 – 3A) ratings. The
variable outputs can work independently, or in series tracking, or parallel mode.
2.2 FEATURES
§Independent control of Voltage and Current controls for variable output.
§CV/CC operation.
§Separate 3 digit displays for voltage (Green) and current (Red) for both variable
outputs.
§LED indication for CV (Green)/ CC (Red) mode.
§Overload indication LED for Fixed output.
§Series tracking and parallel mode operation.
§Power On/Off switch on front panel.
§Input voltage selection on rear side (115 Vac/ 230Vac).
3

Section 3
Installation
3.1 INTRODUCTION
3.2 UNPACKING
3.3 INPUT POWER REQUIREMENTS
3.4 SYSTEM CONFIGURATION
3.5 INSTALLATION
3.6 OPERATING INSTRUCTIONS
3.1 INTRODUCTION
This unit is tested prior to shipment. It is therefore ready for immediate use
uponreceipt.Theinitialphysicalinspectionsshouldbemadetoensurethat
no damage has been sustained during shipment.
3.2 UNPACKING
Inspect the packing box on receipt for any external damage. If any external
damage is evident, remove the instrument and visually inspect it’s case and
parts for any damage. If damage to the instrument is evident, a description
of the damage should be noted on the carrier’s receipt and signed by the
driver or carrier agent. Save all shipping packaging for inspection. Forward
a report of any damage to the agent through which the unit is procured.
Retain the original packing in case subsequent repackaging for return is
required. Use of the original packing is essential.
3.3 INPUT POWER REQUIREMENTS
The instrument can operate on 115V or 230V 50 or 60Hz Line selector plug
on the rear panel allows you to select the line voltage. Before connecting
the power plug to an AC line outlet, be sure to check that voltage Selector
plug is set in the correct position corresponding to the line voltage in your
location and the fuse rating is as shown in the table.
4

3.4 SYSTEM CONFIGURATION
The Model 1672 works in independent mode, series tracking mode or paral-
lel mode. User can select the desired mode by following the user instruc-
tions.
3.5 INSTALLATION
3.5.1 AC Input Power Connection
Before connecting line ensure the following:
a) That correct line voltage tap is selected as described above.
b) That the input fuse rating is as specified.
SELECTOR LINEVOLTAGE FUSE
115V 100 ~ 125V 50/60 Hz 3.0A 6A
230V 220 ~ 240V 50/60 Hz 1.5A 3A
3.5.2 Load Connections
Connect the appropriate load between+ve (Red) and –ve (black)terminal.
For model 1672 the load connection is same as above while using indepen-
dent output.
In serial tracking mode of operation, connect the appropriate load between
+ve (Red) terminal ofmaster and –ve (black) terminal ofslave.
In parallel mode of operation, connect the appropriate load between +ve
(Red) terminal and –ve (black) terminal ofslave OR between +ve (Red) ter-
minal ofmaster and –ve (black) terminal ofslave.
5
3.6 OPERATING INSTRUCTIONS
Before applying power to unit, make sure that input voltage setting is cor-
rect and the ventilation holes are not blocked. Ensure that Ventilation Fan
(26) is working well (it should turn on at power on condition). Do not load
the output if FAN is not working otherwise it may cause the overheating.

6
Model 1672 has two variable outputs, which can work independently
or in series tracking or parallel mode with pull and push switch ar-
rangements provided with master voltage and current control knobs.
Independent Mode
Ensure the master voltage and current control knobs are inPUSHcondition to operate
the variable outputs independently.
Section 4
SETTING THE OUTPUT VOLTAGE AND OUTPUT CURRENT
1. As per load requirement calculate the voltage and maximum current
limit to be set on Output. Note: V=IxR
2. Disconnect the load from output terminals.
3. For current limit adjustment, turn the current adjustment knob (11)
counter-clockwise to get minimum current output.
4Short the circuit between the (7) and (5) output terminals by
the accessory leads.
5. Varythecurrentadjustment knob clockwise untilthe1672current(Red)
displays the required current limit. The C.C. LED will be lighted while
adjusting the current limit. Remove the accessory lead after current
limit adjustment.
6. The voltage will be displayed again and C.V. LED (Green) will be
lighted.
7. Vary the voltage adjustment knob (10) to get the desired output
voltage on the (Green) display.
Depending on Load condition power supply will work either in C.V. or in C.C. mode. The
automatic changeover is indicated by the C.V. / C.C. LED’s.
⊕θ

7
Section 5
Serial Tracking Mode
In this mode negative output terminal of the Master gets connected inter-
nally to positive output terminal of the Slave.
The output is available across Positive output terminal of the Master and
Negative output terminal of the Slave.
1. PULL the Voltage adjustment knob of Master (10). The green LED
(14) will light up to indicate serial tracking mode.
2. Turn the Current adjustment knob of Slave (19) clockwise to maxi
mum.
Set output voltage with the Voltage adjustment knob of Master. The display of Master
shows half voltage of the actual output available across Positive output terminal of the
Master and Negative output terminal of the Slave.
Parallel tracking Mode
InthismodePositiveoutputterminalofMastergetsconnectedinternallytoPositive
output terminal of Slave and Negative output terminal of Master gets connected
to Negative output terminal of Slave. The output voltage will be same as the
Master set value and current and the output current is twice the set master
output current.
1. PULL the Current adjustment knob of Master (11). The red LED (15)
and the red (23) CC LED of the slave output will light up to indicate
parallel tracking mode.
2. Turnbothofthevoltageadjustmentknob (18)andcurrentadjustment
knob (19) of the slave output clockwise to maximum.
3. Set output voltage with the Voltage adjustment knob of Master. The
output current shall be twice of the set master output current.
Multiple units in serial mode
For achieving the higher voltage, two or more units can be connected in
series (Max 240V). The output voltage will be the SUM of twice of set volt-
age of the Master.
1. Set all the 1672, which would be connected in serial operation under
serial tracking mode as described in serial tracking mode and adjusts
to the same output.
2. Connect the Negative of Slave output terminal of the unit 1 to the
Positive of Master output terminal of the unit 2.
3. The output shall be available across Positive of Master terminal of
unit 1 and Negative of Slave terminal of unit 2.

Section 6
Multiple units in parallel mode
The power supply 1672 can be connected two or more units in parallel to
obtain a higher current output (Max. 24A only).
1. Set all the 1672 which will be connected in parallel operation under
parallel tracking mode as described in parallel tracking mode and ad-
just all units to the same output voltage.
2. Make the parallel connection of Positive and Negative terminals of
Master and Slave outputs of all units.
The output voltage of the system will be the same for all the units. The output current
of the system will be the sum of each unit.
FIXED 5V/3A OUTPUT
This is the standard 5V/ 3A power output provided for supplying the power to TTL
logic circuits. When the load exceeds 3A. The red OVER LOAD LED (4) will light up.
The output voltage will lower and the power supply will be under C.C. Mode.
8

Section 7
Technical Specifications
Output Parameters
Number of Outputs Three ( One fixed and Two variable)
Range 0 to 32 Vdc/ 0 to 3A ( variable) and 5V/ 3A (fixed)
Max. output power 195VA
Constant Voltage Mode
Line regulation <0.01% + 5mV
Load regulation <0.2% + 10mV
Ripple & Noise <1mVrms
Temp. coefficient <300PPM/ C
Constant Current Mode
Line regulation <0.2% + 5mA
Load regulation <0.2% + 8mA
Ripple & Noise <1mArms
Tracking Operation
Slave tracking error < 0.5%+3 digital of the master Series Single Supply Reg.
5V Fixed Output
Line Regulation not specified
Load Regulation not specified
Ripple & Noise <1mVrms
Voltage Accuracy 5V 0.85V
Display
Voltage 3 digits 0.56” Green LED
Current 3 digits 0.56” Red LED
Accuracy <0.1% + 3 digits
Input Parameters
Input voltage range 115/230 10%
Input frequency 50/ 60Hz
Operating Environment
Temperature 50 F to 104 F (10 C to 40 C)
Humidity 90 % R.H.
All specifications apply to the unit after a temperature stabilization time of 15 minutes
Mechanical Specifications
Dimensions 9x6.7x12.2lbs. (230X170X310mm) (WXHXD)
Weight 12.6lbs. (5.7kg)
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° °° °
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±
°

Section 8
CONTROLS AND INDICATORS
8.1 INTRODUCTION
8.2 FRONT PANEL DESCRIPTION
8.3 REAR PANEL DESCRIPTION
8.4 PANEL LAYOUT
8.1 INTRODUCTION
This chapter explains the operating procedure of the unit. The operation is
made very simple by providing front panel Potentiometer control.
The Front and rear panel description of the instrument is provided first.
Then the operating procedure is explained in detail.
8.2 FRONT PANEL DESCRIPTION
Refer to the Front panel drawings and the numbers assigned to various
objects on the front panel. (see page 12)
1. POWER SWITCH: Pushing the switch “ON” will light the LED display to indicate
power “ON”.
2. Negative output terminal of the Fixed5V/3A output (black).
3. Positive output terminal of the Fixed5V/3A output (red).
4. Over load indicator LED (Red) for Fixed5V/3A output.
5. Negative output terminal of the Master 0-32V/0-3A Output (black).
6. Ground terminal of the Master output (green).
7. Positive output terminal of the Master 0-32V/0-3A Output (Red).
8. C.C. Mode LED (Red) for the Master to indicate constant current.
9. C.V. Mode LED (Green) for the Master to indicate constant voltage.
10. Master voltage adjustment knob with pull and push switch mechanism for series
tracking mode operation and parallel mode operation along with pull switch of
current adjustment knob.
11. Master current adjustment knob with pull and push switch mechanism for parallel
mode operation.
12. Master Voltage Indicator Display in full 3-digits Green 0.56” LED.
13. Master Current Indicator Display in full 3-digits Red 0.56” LED.
14. Series Mode Indicator LED (Green).
15. Parallel Mode Indicator LED (Red).
10

11
16. Slave Voltage Indicator Display in full 3-digits Green 0.56” LED.
17. Slave Current Indicator Display in full 3-digits Red 0.56” LED.
18. Voltage Adjustment knob for adjustingSlave output voltage when master power is at
C.V. Mode.
19. Current Adjustment knob for adjustingSlave output current when master power is at
C.C. Mode.
20. Negative output terminal of the Slave 0-32V/0-3A Output (black).
21. Ground terminal of the Slave output (green).
22. Positive output terminal of the Slave 0-32V/0-3A Output (Red).
23. C.C. Mode LED (Red) for the Slave to indicate constant current.
24. C.V. Mode LED (Green) for the Master to indicate constant voltage.
8.3 REAR PANEL DESCRIPTION
Refer to the Rear panel drawings and the numbers assigned to various
objects on the front panel. (see page 12)
25. Heat sink for dissipating the heat of power devices.
26. Fan Ventilation (80mm 12V DC Fan).
27. Power input socket
28. Fuse holder and input line selector.
29. The input Line voltage indicator. (Refer to mark)
∇

8.4 PANEL LAYOUT
12
FRONT PANEL OF 1672
REAR PANEL OF 1672

Section 9
Maintenance
9.1 INTRODUCTION
9.2 PREVENTIVE MAINTENANCE
9.3 SERVICE INFORMATION
9.4 TEST EQUIPMENT REQUIREMENTS
9.1 INTRODUCTION
Thischaptergivesinformationaboutpreventivemaintenanceandser-
vice information of the unit.
9.2 PREVENTIVE MAINTENANCE
Please follow the following preventive steps to ensure the proper op-
eration of your instrument.
lNever place heavy objects on the instrument.
lNever place a hot soldering iron on or near the instrument.
lNever insert wires, pins or other metal object into ventilation fan.
lNever move or pull the instrument with power cord or output lead. Especially never
move instrument when power cord or output lead is connected.
lDo not obstruct the ventilation holes in the rear panel. As this will increase the
internal temperature.
lDo not operate the instrument with the cover removed unless you are a qualified
service technician.
lClean and recalibrate the instrument on a regular basis to keep the instrument looking
nice and working well.
Remove any dirt, dust and grime whenever they become noticeable on the Outside
cover with a soft cloth moistened with a mild cleaning solution.
13

9.3 SERVICE INFORMATION
WHEN THE UNIT IS NOT TURNING ON.
Check if the power ON/OFF switch is turned ON. If not, then check the
power cord. Please make sure that the power cord is properly connected to
the unit. Please also check the main switch. And ensure that the AC supply
at your site is the same as the one mentioned at the rear chassis of the unit.
FUSE REPLACEMENT
If the fuse blows, the LED will not light and the instrument will not operate.
Replace only with the correct value fuse. The fuse is located on the rear
panel adjacent to the power cord receptacle.
Remove the fuse holder assembly as follows:
1. Unplug the power cord from rear of the instrument.
2. Insert a small screwdriver in fuse holder slot (located between fuse holder and recep-
tacle).
When reinstalling fuse holder, be sure that the fuse is installed so that the correct line
voltage is selected.
14

9.4 TEST EQUIPMENT REQUIREMENTS
(only required when doing a performance verification test)
The following instruments will be required to test the complete installa-
tion of the unit.
1). A 4½ Digit Multimeter for verifying the output voltage and current.
2). A 20 MHz dual channel oscilloscope for verifying the Ripple in the DC
Output/s.
3). A Resistive load to suit the maximum output current from the unit de-
pending on the model and capacity.
4). A Standard calibrated current shunt to measure the output current.
15

Limited One-Year Warranty
B&K Precision Corp. warrants to the original purchaser that its product and the
component parts thereof, will be free from defects in workmanship and materials
for a period of one year from the data of purchase.
B&K Precision Corp. will, without charge, repair or replace, at its’ option, defec-
tive product or component parts. Returned product must be accompanied by
proof of the purchase date in the form a sales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by
completing and mailing the enclosed warranty card to B&K Precision Corp.,
22820 Savi Ranch Parkway, Yorba Linda, CA 92887 within fifteen (15) days from
proof of purchase.
Exclusions: This warranty does not apply in the event of misuse or abuse
of the product or as a result of unauthorized alternations or repairs. It is
void if the serial number is alternated, defaced or removed.
B&K Precision Corp. shall not be liable for any consequential damages, including
without limitation damages resulting from loss of use. Some states do not allow
limitation of incidental or consequential damages, so the above limitation or
exclusion may not apply to you.
This warranty gives you specific rights and you may have other rights, which vary
from state-to-state.
Model Number: __________ Date Purchased: _____________
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
www.bkprecision.com
17