30V- 2A Power Supply
ST4073
Operating Manual
Ver.1.1
An ISO 9001 : 2000 company
94-101, Electronic Complex Pardesipura,
Indore- 452010, India
Tel : 91-731- 2570301/02, 4211100
Fax: 91- 731- 2555643
e mail : info@scientech.bz
Website : www.scientech.bz
Toll free : 1800-103-5050
ST4073
Scientech Technologies Pvt. Ltd. 2
ST4073
RoHS Directive concerns with the restrictive use of Hazardous substances (Pb,
It is mandatory that service engineers use lead free solder wire and use the
soldering irons upto (25 W) that reach a temperature of 450°C at the tip as the
30V- 2A Power Supply
ST4073
Table of Contents
1. Introduction 5
2. Technical Specifications 6
3. Front Panel Controls 7
4. Operating Instructions 8
• General Information
• Safety
• Operating Conditions
• Operation
5. Functional Checks 10
6. Warranty 11
7. List of Accessories 11
RoHS Compliance
Scientech Products are RoHS Complied.
Cd, Cr, Hg, Br compounds) in electric and electronic equipments.
Scientech products are “Lead Free” and “Environment Friendly”.
melting temperature of the unleaded solder is higher than the leaded solder.
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ST4073
Safety Instructions
Read the following safety instructions carefully before operating the instrument. To
avoid any personal injury or damage to the instrument or any product connected to it.
Do not operate the instrument if suspect any damage within.
The instrument should be serviced by qualified personnel only.
For your safety :
Use proper Mains cord : Use only the mains cord designed for this instrument.
Ensure that the mains cord is suitable for your
country.
Ground the Instrument : This instrument is grounded through the protective
earth conductor of the mains cord. To avoid electric
shock the grounding conductor must be connected to
the earth ground. Before making connections to the
input terminals, ensure that the instrument is properly
grounded.
Observe Terminal Ratings : To avoid fire or shock hazards, observe all ratings and
marks on the instrument.
Use only the proper Fuse : Use the fuse type and rating specified for this
instrument.
Use in proper Atmosphere : Please refer to operating conditions given in the
manual.
1. Do not operate in wet / damp conditions.
2. Do not operate in an explosive atmosphere.
3. Keep the product dust free, clean and dry.
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ST4073
Introduction
• Floating DC supply voltages
• DC : 0 - 30V; 0-2 Amp
• Constant voltage & constant current operation
• Digital display for voltage and current
• Adjustable current limiter
The ST4073 30V, 2A Power Supply has been designed as a constant current (CC)
and constant voltage (CV) source for laboratories, industries and field testing
applications, featuring low power loss, compact and light weight. It provides floating,
DC output voltages and is ideally suitable for complex analog and digital applications.
The DC output can be continuously adjusted from 0 -30V with coarse and fine
controls. Current limit is also adjustable from 0-2A. Any over loading for adjusted
current limit, is indicated by flashing "CC" LED. When the maximum setting is
crossed or the overheating has occurred, the LED will lit up.
A 3-digit display for voltage and current is used to read the instantaneous values.
These two parameters are switchable for indicating either voltage or current. In
addition to low residual ripple and noise, it has excellent line and load regulation. The
30V- 2A Power Supply is also provided with all protective circuits to ensure trouble
free operation.
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ST4073
Technical Specifications
DC Output : 0-30V, continuously variable by means of
coarse and fine controls
Output Current : 2A (Maximum)
Setting Resolution : Voltage : 10mV
Current : 5mA
Internal Resistance : ≤ 10 mΩ
Stability : ≤ 2.5 mV at 30V/2A
Recovery Time : ≤ 50 µs
Load Regulation : ≤ (0.05% + 10 mV)
Line Regulation : ≤ (0.05% +10 mV)
Temperature Coefficient : ≤ (0.05% + 5 mV/°C)
Ripple & Noise : ≤ 1mVrms
Current Limit : Adjustable between 100mA to 2A
Display : 3 digits for voltage and current
Accuracy : ± (1 % of reading + 1 digit)
Over Range Indication : By flashing 'CC' LED
General Information
Built in over voltage, overload, overheat & short circuit protection. All outputs are
floating.
Insulation
Between chassis and output terminal > 10 MΩ at 100VDC.
Between chassis and AC plug > 50 MΩ at 500V DC
Power Supply : 230 V AC ± 10% 50Hz
Operating Conditions : 0-40°C; 90 % RH
Dimension (mm) : W 196 x H 80 x D 262
Weight : 4 Kgs approximately
(Subject to Change)
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ST4073
Front Panel Control
1 Power : Push switch for supplying power to instrument.
2 V/A (Push button) : For switching the display from voltage to current reading
or vice versa. When the pushbutton is pressed, the current supplied from the
terminals (5) is displayed with a resolution of 10mA. In released position the
voltage across the terminals (5) is displayed with a resolution of 0.1 V.
3 Coarse : (adjusting knob): For the coarse setting of the output voltages.
4 I Max. (adjusting knob) : For current limit setting, adjustment range 2mA -
2A.
5 Output 0 - 30 V : Output terminals for 4mm banana plugs or cable connection.
The output voltages are short circuit protected.
6 Fine (adjusting knob) : For the fine settings of the output voltage, adjustment
range approximately 2.1 V.
7 Digital Display (7-segment LED) : 3-digit readout for output voltage and
current for terminals (5) is indicated.
8 V & A Indicators : Two LEDs indicate the unit of the display.
9 CC (constant current/over range indicator) : LED lights up when the output
current in excess of the set value.
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ST4073
Operating Instructions
General Information :
The logical front panel layout of 30V- 2A Power Supply makes it easy to become
familiar with the operation of the instruments. However, even experienced users
should read the following instructions thoroughly before using the instrument.
After unpacking the instrument, check for any mechanical damage or loose parts
inside. Should there be any transportation damage, inform the supplier immediately
and do not put the instrument into operation.
Safety :
The case chassis and all measuring parts are connected to the protective earth contact
of the inlet. The mains plug shall only be inserted in a socket outlet provided with a
protective earth contact. The protective action must not be negated by the use of an
extension cord without a protective Conductor.
Warning !
Any interruption of the protective conductor inside or outside the instrument or
disconnection of the protective earth terminal is likely to make the instrument
dangerous. Intentional interruption is prohibited. The mains/line plug should be
inserted before connections are made to measuring circuits.
When removing the metal case or replacing, the instrument must be completely
disconnected from the mains supply. If any measurement or calibration procedures are
unavoidable on the opened-up instrument, these must only be carried out by qualified
personnel acquainted with the danger involved.
Operating Conditions :
The ambient temperature range during operation should be between 0°-40°C and
should not exceed - 20°C or + 70°C during transportation or storage. The operational
position should be normal however; the ventilation holes on the 30V, 2A Power
Supply must not be obstructed. Prior to calibration a preheat run of approximately 30
minutes is required.
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ST4073
First Time Operation :
After unpacking the instrument check for any mechanical damages. The instrument
should be plugged in mains-plug of proper mains supply 230V ± 10%. Switch ‘On’
the instrument, the power ‘On’ is indicated by lighting of displays.
Operation :
The Power Supply has an electrically floating output. This permits easy series
connection with other Power Supply units, to increase supply voltage or current
respectively.
The output power of the 30V- 2A Power Supply is not activated by switching on the
instrument. This is for protection of the load, connected to the output. Push button (2)
should be not activated until all settings are made. This push button is also useful for
disconnecting the source from the load for any reason. The digital display always
shows the actual values of voltage and current. The voltage display is active also
when the outputs are disabled, thus permits voltage adjustment prior to connecting
any load.
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ST4073
Functional Checks
The 30V- 2A Power Supply should regularly be tested to assure proper functioning.
The following test checks out the power supplies performance and suggestions for
adjusting specific values. The adjustment will only be meaningful if the below
indicated or equivalent instruments are used. Prior to the functional test or adjustment,
the instrument should be on for at least 30 minutes.
Measuring Instruments required :
1. 4 ½ Digit DMM; 4011 Handheld or equivalent
2. 20 MHz Oscilloscope; Caddo 802 or equivalent
3. Rheostat: 100 Ω- 2A; 17 Ω- 5.5A
Test Procedure :
0-30V DC output
1. Check of maximum DC output voltage : Set the Coarse and Fine knobs to
maximum, the maximum DC output reading should be between 31V and 33 V.
This also can be verified on DMM.
2. Check of minimum DC output voltage : Set the Coarse and Fine knobs to
minimum, the minimum DC output reading should be 00.0 Volts, which when
measured on DMM will be approximately 25mV for load resistor of < 5KΩ.
3. Check of minimum current limit setting : Set DC output to 10V & short circuit
the output terminals. Adjust current limit knob I max to minimum the reading on
the display should be < 100mA.
4. Check of maximum. Output current : Set the DC output voltage to 10V. Short-
circuit the output terminals. Adjust the I max current limit knob to maximum, the
reading on the display, should be between 2.02A and 2.2A.
5. Check of over load Indicators : Set the instrument as in 3. When the output
terminals are short circuited, CC LED should light up.
6. Check of residual ripple and noise : Connect any load on DC output and adjust
the I max, to maximum (maximum to 2000mA), and check the ripple and noise on
oscilloscope, the ripple and noise should not be more than 1mVrms.
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ST4073
Warranty
1. We guarantee the product against all manufacturing defects for 36 months from
the date of sale by us or through our dealers. Consumables like dry cell etc. are
not covered under warranty.
2. The guarantee will become void, if
a) The product is not operated as per the instruction given in the operating
manual.
b) The agreed payment terms and other conditions of sale are not followed.
c) The customer resells the instrument to another party.
d) Any attempt is made to service and modify the instrument.
3. The non-working of the product is to be communicated to us immediately giving
full details of the complaints and defects noticed specifically mentioning the
type, serial number of the product and date of purchase etc.
4. The repair work will be carried out, provided the product is dispatched securely
packed and insured. The transportation charges shall be borne by the customer.
For any Technical Problem Please Contact us at service@scientech.bz
List of Accessories
1. Mains Cord ................................................................................................1 No
2. e-Manual ..................................................................................................1 No.
Scientech Technologies Pvt. Ltd. 11
Updated 15-01-2009
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