ScienTECH 4075 User manual
Scientech 4075 30V- 2A Dual Power Supply
2
30V- 2A Dual Power Supply
Scientech 4075
Table of Contents
1. Safety Instructions 4
2. Introduction 5
3. Technical Specifications 6
4. Front Panel Controls 7
5. Operating Instructions 8
General Information
Safety
Operating Conditions
Operation
6. Functional Checks 9
7. Warranty 10
8. List of Accessories 10
Scientech 4075 30V- 2A Dual Power Supply
3
Safety Instructions
Read the following safety instructions carefully before operating the product.
To avoid any personal injury, or damage to the product, or any products connected to
it;
Do not operate the instrument if you 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 product.
Ensure that the mains cord is suitable for your
country.
Ground the Instrument : This product 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 product.
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.
Scientech 4075 30V- 2A Dual Power Supply
4
Introduction
The 30V, 2A Dual Power Supply Scientech 4075 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 "ORA" and "ORB" LEDs. When the maximum
setting is crossed or the overheating has occurred, the LED will lit up. A special
automatic overload (current) protection circuit limits the maximum current to 2A.
Two displays (one 3-digit display for voltage & other 3-digit for current) are used to
read the instantaneous values. These two can be switched simultaneously for either of
the DC outputs. In addition to low residual ripple and noise, it has excellent line and
load regulation. The 30V, 2A Dual Power Supply is also provided with all protective
circuits to ensure trouble free operation.
Scientech 4075 30V- 2A Dual Power Supply
5
Features
Floating DC Supply Voltages
DC: 2 x 0 - 30V; 0-2 A
Automatic Overload (Current Protection)
Constant Voltage & Constant Current Operation
Digital Display for Voltage and Current
Adjustable Current Limiter
Scientech 4075 30V- 2A Dual Power Supply
6
Technical Specifications
DC Output : Dual output 0-30V, continuously variable by means of
coarse and fine controls
Output Current : 2A (maximum) each
Setting Resolution : Voltage: 10mV
Current: 5mA
Internal Resistance : ≤ 15mΩ
Stability : ≤ 2.5mV
Recovery Time : ≤ 50 s
Load Regulation :≤ (0.05% +10 mV)
Line Regulation : ≤ (0.05% +10mV)
Temp. Coefficient : ≤ (0.05% + 5 mV/C)
Ripple & Noise : ≤ 1 mVrms
Current Limit : Adjustable between 100 mA to 2A
Display : 3 digits for voltage 3 digits for current
Accuracy : ± (1 % of reading +1 digit)
Over Range Indication : By flashing 'ORA' and 'ORB' LED
General Information:
Built in over voltage, overload, overheat & short circuit protection.
All outputs are floating.
Insulation:
Between chassis and :> 10 MΩ at 100V DC
output terminal.
Between chassis and :> 50 MΩ at 500V DC
AC plug
Power Supply : 230 V AC ±10%, 50 Hz
Operating Conditions : 0-400C; 90% RH
Dimension (mm) :W 285 x H75 x D 385
Weight :5 Kgs. approximately
(Subject to Change)
Scientech 4075 30V- 2A Dual Power Supply
7
Front Panel Control
1Power: Push switch for supplying power to instrument.
2A: 0-30V & B: 0-30 (4mm banana terminals): Output terminals for
4mm banana plugs or cable connection. The output voltages are short
circuit protected.
3 & 13 Coarse (Adjusting Knob): For the coarse setting of the output voltages at
A & B respectively.
Adjustment range: 0-30V.
4 & 14 Fine (Adjusting Knob): For the fine settings of the output voltage for A
& B output terminals. Adjustment range approximately 2.1 V.
5 & 12 I max (Adjusting Knob): For current limit setting of the outputs A & B
respectively. Adjustment range 100mA - 2A each.
6 & 10 Digital Display (7-Segment LED): 3-digits readout for output voltage &
3 digit readout for output current.
7 & 11 A & V Indicators: Two LEDS indicates the unit of the display.
8Select Display (Push Buttons): Two push buttons can be pressed one at a
time. When pressed each button select displays (Voltage & Current)
simultaneously for the respective voltage source i.e. A or B to show the
instantaneous values.
9 ORA & ORB (Overload Indicators): LEDs for overload indication for
respective DC outputs are provided. Fixed DC output. In case of
overheating or output current in excess of set limit corresponding OR LED
lits up.
Scientech 4075 30V- 2A Dual Power Supply
8
Operating Instructions
General Information:
The logical front panel layout of 30V- 2A Dual 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° to 50°C and
should not exceed -20°C to +70°C during transportation or storage. The operational
position should be normal however; the ventilation holes on the 30V, 2A Dual Power
Supply must not be obstructed. Prior to calibration a preheat run of approximately 30
minutes is required.
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.
Scientech 4075 30V- 2A Dual Power Supply
9
Functional Checks
The 30V, 2A Dual 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 Handheld 4011or equivalent
2. Scientech Oscilloscope 801/831 or equivalent
3. Rheostat: 100Ω- 2A and 17 Ω- 5.5A.
Test Procedure:
0- 30V DC output (common for both outputs)
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
which 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 0.00V which when
measured on DMM will be approximately 25mV. for load resistor of < 5 KΩ.
3. Check of minimum current limit setting:Set DC output to 10V & connect 5Ω
load to the output terminals. Adjust current limit knob I maximum to minimum
the reading on the display should be < 100mA.
4. Check of maximum output current: Set the DC output voltage to 10V, connect
5Ω load to the output terminals. Adjust the I max current limit knob to maximum,
the reading on the display, should be between 2.02 A and 2.2A
5. Check of over load indicators: Set the instrument as in 3. When the output
terminals are short circuited, 'ORA' or 'ORB' LED should lit up.
6. Check of residual ripple and noise: Connect any load to DC output and adjust
the Imax, to maximum of 2A and check the ripple and noise on oscilloscope, the
ripple and noise should not be more than 1mVrms.
Scientech 4075 30V- 2A Dual Power Supply
10
Warranty
1. We guarantee this product against all manufacturing defects for 12 months from
the date of sale by us or through our dealers.
2. The guarantee will become void, if
a. The product is not operated as per the instruction given in the Learning
Material.
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.
Hope you enjoyed the Scientech Experience.
List of Accessories
1. Mains Cord ....................................................................................................1 No
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