Scientific PSA3200 User manual

User Manual
Programmable Switch
Mode Power Supplies
PSA3200

Copyright © Scientific All rights reserved.
Disclaimer
This instrument contains proprietary information, no part of this manual may be photocopied, reproduced or
translated without any prior written consent.
Information in this manual supercede all corresponding previous released material.
Scientific continues to improve products and reserves rights to amend part or all of the specifications,
procedures, equipment at any time without notice. Scientific shall not be liable errors contained in this
document or if for incidental or consequential damages in connection with the furnishing, performance or use
of this material.
Rev 1.00/ 0721
2
Scientific Mes-Technik Pvt. Ltd.,
B-14 Industrial Estate, Pologround,
Indore- 452015,
India
Tel : [phone]/33
Fax : [phone],561641
Email : [e-mail]
Website: www.scientificindia.com
User Manual PSA3200

Programmable Switch Mode Power Supplies
PSA3200
Table of Contents
Introduction 5
Safety instructions 6
Safety symbols 7
Chapter 1 Technical specifications 8
1.1 Specifications 8
1.2 Power supply outline drawings - dimension 11
Chapter 2 Panel controls 13
2.1 Front panel controls 13
2.2 Rear panel controls 14
2.3 Sockets, connector description used on rear panel 15
Chapter 3 Installation 17
3.1 AC Input mains connections 17
3.2 Cooling 17
3.3 Use of instrument on table top 17
3.4 Use of instrument in 19” Rack mounting cabinet 18
3.5 First time operation power ON 19
3.5.1 AC mains input 19
3.5.2 Connecting to AC mains 19
3.5.3 DC output check 20
3.5.4 DC constant current check 20
Chapter 4 Descriptions 21
4.1 Safety first - grounding 21
4.2 Input Voltage 21
4.3 Operating conditions 21
4.3.1 Temperature & humidity 21
4.3.2 Storage 21
4.4 Thermal protection 21
4.5 Cooling 22
4.6 Output 22
4.7 Connecting the load 22
4.8 Local & remote Sensing 23
4.9 Constant voltage and constant current mode 24
4.10 Hold up time 24
4.11 Over voltage protection 24
3 User Manual PSA3200

4.12 AC fail 24
4.13 Analog programming 24
4.14 Description of analog connector pins and application 25
4.15 Safe start - auto start mode 28
4.16 Connecting load 28
4.17 Connecting power supplies in series and parallel 29
4.18 Power supply as battery charger 29
Chapter 5 Maintenance 30
5.1 Troubleshooting 30
Chapter 6 Dispatch procedure for service & Warranty 32
6.1 Dispatch procedure for service 32
6.2 Warranty 32
4 User Manual PSA3200

5
User Manual PSA3200
Programmable Switch Mode Power Supplies
PSA3200 Series
Compact 2 U size
Fast transient response
High slew Rate
Analog Programming
Models with Output Voltage 16V to 1000 V, 3200 W Power
The PSA Series power supplies is designed for compact 2 U size with user friendly operation and higher
efficiency.
Transient response better than 100 us, ensures that the output of the power supply recovers much faster and
remains constant and oscillation free for dynamic loads. Power supplies can be remotely controlled
programmed through analog programming.
With various protection features, over voltage protection, short circuit protection, protects expensive loads
circuits in testing.
All the PSA series models can be operated from line voltage 207 to 270 V, 47 Hz ~ 63 Hz. Power factor
correction also provides to ensure low harmonic content.

Safety instructions
The general safety instructions and symbols must be observed during all phases of operation of this
instrument. Failure to comply with these precautions or with specific warnings or instructions givens in this
manual violates safety standards of design, manufacture, and intended use of the instrument. Scientific
assumes no liability for the customer's failure to comply with these requirements.
- Before applying power, verify all the safety precautions are taken, make all the connections firm.
- Make sure the protective ground of the unit is connected with system ground.
- Always operate the instrument only in prescribed operating conditions.
- Do not modify the instrument, This instrument is designed to meet all the safety and operating
conditions. Any modification done may not be complying to the safety requirement and instrument ma
y
be damaged , causing hazardous conditions.
Environmental conditions
Please do not operate the instrument in the place that vibrates, dusty, under direct sunlight or where there is
corrosive air. The Scientific Power supplies are designed for safety, applies to following conditions.
- Indoor use.
- Ambient temperature 0 ~ 50°C non condensing 75% RH , 0~40°C non condensing 95% RH
- Altitude up to 3000 meters
- Pollution degree 2
Installation category
These instruments are designed for installation category II, Over voltage category II.
Grounding
The instrument ground must be well connected to instrument chassis of AC power mains input supply.
The instrument must be connected through three conductor power cable, with the ground wire firmly
connected to the electrical safety ground of power outlet. Any interruption in protective ground
conductor , or disconnection will cause potential hazard that might cause personal injury.
Mains Input rating
This power supply unit is designed for specific mains input connections, as specified in the Technical
specifications. Do not use AC supply exceeding the limits. For safety reasons the mains AC may
should not fluctuate more than 10 % of nominal voltage.+
Fuse
Fuses must be changed by authorized Scientific service personal only for continued
protection against risk and safety.
Live circuits
There are no serviceable part or alignment required by Operating personnel. Operating must not
remove the instrument cover. No internal adjustment or component replacement is allowed by non-
Scientific authorised qualified personnel. Never replace components with power cable connected. To
avoid injuries, always disconnect power, discharge circuits and remove external voltage source before
touching components.
6 User Manual PSA3200

Safety symbols
Caution !
Caution ! : Denotes a hazard. Failure to follow instructions could result in minor personal injury and/or property
damage. Follow the instructions for proper procedures.
Warning !
Warning ! : Denotes a hazard. Failure to follow instructions could result in personal injury and/or SEVERE
property damage. Follow the instructions for proper procedures.
Symbols marked on instruments
Attention refer to the manual.
Caution ! Hazardous voltage exists, Electric shock.
Indicates Protective Ground Terminal
Indicates Ground Terminal
Off ( Supply )
On ( Supply )
7 User Manual PSA3200
Information on electrical and electronic equipment recycling
Our Equipment contain high quality components and material and are designated to facilitate recycling.
After appropriate use of this equipment , when this is to be discarded , the equipment must not be treated
as municipal waste. This must be disposed of separately via the appropriate return and collection system
available. By following these instructions, you ensure that the product is treated correctly and help to
reduce potential impacts on the environment and human health, which otherwise result from
inappropriate handling. Recycling helps to conserve natural resources and protect environment.
For more information on collection and return, please contact dealer / from where you have purchased / to
us giving full details.

8 User Manual PSA3200
Chapter 1 Technical specifications
1.1 Specifications (Unless otherwise stated these specifications are defined over the temperature range of
0 to 40° C.)
A. DC Voltage, Current Specifications & Display : Models PSA16-200, PSA20-160, PSA32-100,
PSA40-80, PSA60-52, PSA80-40, & PSA100-32
PSA16-200PSA20- 160 PSA32-100 PSA40-80 PSA60-52 PSA80-40 PSA100-32
DC Outputs Voltage V 16 20 32 40 60 80 100
DC Output Current A 200 160 100 80 52 40 32
Power 3200 Watts
Efficiency at 230V full load 80% 80% 83% 83% 83% 85% 85%
Constant Voltage Mode
Load regulation 0 ~ 100% mV 3 3 5 5 5 5 5
Line Regulation mV 2 2 2 2 2 2 2
Ripple BW=300 kHz mVrms 8 8 8 8 8 10 12
Ripple 5Hz~1MHz mVrms 12 12 12 12 12 15 18
Ripple 20 MHz mVpp 40 40 40 50 50 55 60
Constant Current Mode
Load regulation 0 ~ 100 % mA 10 10 10 8 8 7 7
Line Regulation mA 2 2 2 2 2 2 2
Ripple BW=300 kHz mArms 25 25 20 20 20 20 18
Ripple BW=5 Hz ~1MHz mArms 3 3 3 3 3 3 3
Ripple 20 MHz mApp 200 150 150 120 110 100 90
Remote sense drop 1 V 1 V 2 V 2 V 2 V 2 V 2 V
Programming Speed
Rise time ( 10% to 90% ) into resistive load
Time 100% load ms 20 25 30 35 40 45 50
Time 10% load ms 18 22 25 30 35 40 45
Fall time ( 90% to 10% ) into resistive load
Time 100% load ms 20 20 22 22 25 35 50
Time 10% load ms 200 210 225 240 250 350 400
Time No load s 1.2 1.2 1.5 2.0 2.5 3.0 3.5
Display
Accuracy Voltage : ± (0.5% + 2D), Current : ± (0.5% + 2D)
Scale Voltage (V) 0-16.0 0-20.0 0-32.0 0-40.0 0-60.0 0-80.0 0-100
Current (A) 0-200 0-160 0-100 0-40.0 0-53.3 0-40.0 0-32.0
Resolution Voltage 100 mV 100 mV 100 mV 100 mV 100 mV 100 mV 1 V
Current 1 A 1 A 1 A 0.1 A 0.1 A 0.1 A 0.1 A

9 User Manual PSA3200
B. DC Voltage, Current Specifications & Display : Models PSA120-26, PSA160-20, PSA300-10,
PSA600-5, PSA800-4 & PSA1000-3
PSA120-26 PSA160-20 PSA300-10 PSA600-5 PSA800-4 PSA1000-3
DC Outputs Voltage V 120 160 300 600 800 1000
DC Output Current A 26 20 10.6 5.3 4 3.2
Power 3200 Watts
Efficiency at 230V full load 85% 85% 85% 87% 87% 87%
Constant Voltage Mode
Load regulation 0 ~ 100% mV 5 8 8 15 15 15
Line Regulation mV 3 3 3 5 5 5
Ripple BW=300 kHz mVrms 12 15 18 25 35 60
Ripple 5Hz~1MHz mVrms 18 20 25 30 45 70
Ripple 20 MHz mVpp 60 70 80 100 120 150
Constant Current Mode
Load regulation 0 ~ 100 % mA 7 6 5 5 5 5
Line Regulation mA 2 2 2 2 2 2
Ripple BW=300 kHz mArms 18 15 15 15 15 15
Ripple BW=5 Hz ~1MHz mArms 3 3 3 3 3 3
Ripple 20 MHz mApp 85 70 60 50 35 30
Remote sense drop 2 V 2 V 2 V 5 V 5 V 5 V
Programming Speed
Rise time ( 10% to 90% ) into resistive load
Time 100% load ms 70 100 150 175 200 275
Time 10% load ms 63 95 140 165 240 260
Fall time ( 90% to 10% ) into resistive load
Time 100% load ms 80 100 180 200 220 250
Time 10% load ms 600 800 850 1000 1200 1500
Time No load s 4.5 6 8 10 12 15
Display
Accuracy Voltage : ± (0.5% + 2D), Current : ± (0.5% + 2D)
Scale Voltage (V) 0-120 0-160 0-300 0-600 0-800 0-1000
Current (A) 0-26.7 0-20.0 0-10.7 0-5.33 0-4.00 0-3.20
Resolution Voltage 1 V 1 V 1 V 1 V 1 V 1 V
Current 0.1 A 0.1 A 0.1 A 0.01 A 0.01 A 0.01 A
C. Analog Programming and other specifications
Temperature Coefficients CV : 100 ppm/°C CC : 100 ppm after warm up of 30 min
Output Stability CV : 100 ppm/°C CC : 100 ppm after warm up of 30 min and during 8 hrs
Analog Programing (Rear panel 25 pin D connector)
Programing V : 0 ~ 5 V, Accuracy : 0.5 % of Vout rated, Input impedance : 1M+ Ω
I : 0 ~ 5 V, Accuracy : 1 % of Iout rated Input impedance : 1 M+ Ω

User Manual PSA3200 10
Monitoring V out : 0 ~ 5 V, Accuracy : 1 % of Vout rated+
Output impedance : 150 / 4 mA maxΩ
I out : 0 ~ 5 V, Accuracy : 1 % of Iout rated+
Output impedance : 150 / 4 mA maxΩ
V reference 5.1 V 15 mV+
Status outputs Power Supply OK Logic 1 (High); AC Fail – Logic 0 (Low)
DC Fail – Logic 0 (Low), for DC fails by 5 % set value+
CV / CC Status : CV :Logic 0 / CC Logic 1
Interlock : Short = Power Supply enabled , Open = Power Supply disabled
DC ON status : ON = Logic 1 , OFF = Logic 0
OVP status Fault : Logic 0, else OK =Logic 1
OTP status Fault : Logic 0, else OK =Logic 1
Remote shutdown +5 V
Front Panel Controls
Indicators
Mains ON/ OFF, Voltage and Current setting with multi-turn potentiometer
(Coarse and fine), OVP Setting
LEDs for : Voltage, Current, CV, CC, Output ON, OVP, ACF, OTP
Protections Over voltage , Over current, Short Circuit, Fold back, Over temperature
Output Terminals Bus bar with M5 bolts
Mains Input AC input, Single phase, 207 to 270 V, 50 / 60 Hz ( 47 ~ 63Hz)
Input connector : IEC320/C14 , EN 60320/14
Internal Fuse L : 20 A, 6.3 x 32 mm ceramic fuse.
Power Factor 0.99 @ full load / 0.98 @ 50% load
Turn On delay 600 ms after mains switched ON
Inrush current <50A
Hold up Time 20 ms
Environment Conditions
Operating Temperature 0 ~ +50°C; with 100% load; derated 75% at 60°C
Storage -40 ~ + 85°C
Humidity max. 95% non condensing at 40°C, max. 75% non condensing at 50°C
Safety Insulation : Input to Output : 3750 V for 1 min
Input to case : 2500 Vrms Output to case : 600 V
Insulation resistance : 100 M at 25°C, 70% RH, 500 Vdc
Dimension W x D x H : 443 x 557 x 87 mm (2U, 19” Rack size) excluding connectors,
terminals, switches, front and back panel controls, handles etc.
Weight 13.5 kg approx.
Cooling Forced variable fan speed
Interfaces
Standard Analog Programing
Accessories Supplied User Manual, Mains Connector
Notes:
1. Subject to change without notice.
2. Sensing at the rear panel of the power supply unit at sense terminals.
3. Unit warm up time is 30 min.
4. Minimum output voltage guaranteed to maximum of 0.2% rated.
5. Minimum output current guaranteed to maximum of 0.4% rated.

User Manual PSA3200 11
1.2 Power supply outline drawings - Dimension
Note : Height excluding instrument feet
Note : When the power supply unit is mounted in 19” rack cabinet, instrument feet are removed and
side rack mounting handle assemblies are fitted on both side.
Front panel when unit is mounted in 19” rack cabinet :
Rear panel when unit is used on table top :
Side view when unit is used on table top :
Front panel when unit is used on table top :
482.5 mm
432.0 mm
557 mm
27.0 mm25.0 mm
432.0 mm

User Manual PSA3200 12
Top view :
Output bus dimension :
432.0 mm
27.0
in mm

User Manual PSA3200 13
Chapter 2 Panel controls
The logical arrangement of the controls allows anyone to familiar with the operation of the equipment after a
short time, however, even experienced users are also advised to read through these instructions so that all
functions and the safety are understood. if the equipment is not used as described in this manual, the
protection provided by the equipment may be impaired.
2.1 Front panel controls
The front panel controls are arranged erogonimically to ease in operation with indicators. Before using the
power supply unit, please read the following explanation to each control and connectors.
11 1312
1
6
2345
7 8 9 10
1 AC Power Switch : Mains AC power ON/Off control, when switched to ON, supplies main AC power
to unit.
2 Voltage control : Voltage potentiometer control for setting the voltage. This is a 10 turn mul
ti-turn
potentiometer, which gives fine adjustment control.
3 Display Voltage : Display for setting and measured of output voltage.
4 Display Current : Display for setting and measured of output current.
5 Current control : Current potentiometer control for setting the current. This is a 10 turn mul
ti-turn
potentiometer, which gives fine adjustment control.
6 CV LED indicator : LED indicator for CV , lights when power supply is in constant voltage mode.
7 Set : Push button control for selecting setting for voltage and current. Keep Set pressed
and adjust the voltage potentiometer to set the output voltage. Similarly current can
be set. Set LED gets ON when Set push button is pressed.
8 OVP : Push button control for selecting setting for over voltage protection. Keep pressed
and adjust the OV potentiometer with the help of screw driver to desired value of over
voltage protection. Set LED gets ON when Set push button is pressed.
9 Out : Push button to control DC output ON / Off. Associated LED above lights when the
output is ON.
10 CC LED indicator : LED indicator for CC , lights when power supply is in constant current mode.
11 Instrument Feet : Instrument feet, to be fixed when power supply unit is to be used on table. E
lse not
needed when mounted in 19” rack cabinet.
12 Instrument handel : Mounted on either side of the power supply unit for lifting the unit while mounting in
19” rack cabinet.
13 Mounting holes : Mounting holes used in fixing the unit in 19” rack cabinet.

User Manual PSA3200 14
1 PE : Terminal provided to make connection to protective earth.
2 – DC Output + : DC Output Bus bars, to connect the load.
3 Sense Terminals : Remote sense terminals. Mating connector is provided with the instrument.
4 Analog Programming: 25 pin (F) D type connector for remote analog programming. Refer Analog
programming description details.
5 V / M - P : Switch selection for external voltage programming. To select external
programming slide the switch to P. M is for manual programming from front panel.
6 I / M - P : Switch selection for external current programming. To select external
programming, slide the switch to P. M is for manual programming from front panel.
7 Out / On-Off : Switch selection for auto output ON for when mains switch is powered ON. If
kept at Off, the output will be Off , when power switch is made On.
8 INTLK/ En-Dis : Switch selection for Interlock function enable / disable.
9 AC Input : AC mains inlet socket to power the instrument.
2.2 Rear panel controls
The rear panel is arranged with mains inlet connector, output terminals and analog programming ports
etc. .
123 4 6

User Manual PSA3200
Sense Terminal
Pin 1 L – Local sense –
Pin 2 S – Remote sense –
Pin 3 NC Not connected
Pin 4 S + Remote sense +
Pin 5 L + Local sense +
Programming Switch settings :
There are four slide switch on rear panel, the settings are ;
Voltage Programming : When the switch is on M the voltage is
set from the front panel, when set to P, the voltage is set f r o m
the analog connector.
Current Programming : When the switch is on M the current is
set from the front panel, when set to P , the current is set
from the analog connector.
Output ON/OFF on mains switched ON : When the switch is at
Off, the output of the power supply will be in OFF condition, when
the mains switch is switched ON. If the switch is set to On, the
output will be ON with mains switched ON.
Interlock selection : When the switch is set to Dis (disable), the
power supply operates in normal condition. When the switch is
set to En (enable), the interlock function is enabled. See details
further for operation.
Default connections
for Local
2.3 Sockets, connector description used on rear panel
The rear panel has different types off connections to other equipments for controlling, monitoring etc. ,
followings are connections for quick understanding. Detailed description on each is in specific inside the
manual.
15

User Manual PSA3200
Analog programming connector
Pin 1 Interlock +
Pin 2 Ground Analog Programming
Pin 3 Ground Analog Programming
Pin 4 Reserved, Please do not connected any circuit to this pin !
Pin 5 Over Voltage Status
Pin 6 Over Temperature Status
Pin 7 Reference Voltage output 5.1 V
Pin 8 Not Connected
Pin 9 Voltage Programming input
Pin 10 Current Programming input
Pin 11 Voltage Monitoring Output
Pin 12 Ground Analog Programming
Pin 13 CV / CC Status
Pin 14 Interlock –
Pin 15 Remote Shut Down input
Pin 16 Power Supply status
Pin 17 DC Output ON status
Pin 18 Reserved, Please do not connected any circuit to this pin !
Pin 19 AC Fail status output
Pin 20 DC Fail status output
Pin 21 Not connected
Pin 22 Ground Analog Programming
Pin 23 Ground Analog Programming
Pin 24 Current Monitoring Output
Pin 25 Not connected
16

Chapter 3 Installation
Your instrument is thoughtfully designed, manufactured, tested and inspected, found free of mechanical and
electrical defects. When you receive the instrument, some inspections are necessary, and the condition must
be understood and available before installing the instrument. Inspect the shipping container for damage if any
after unpacking it. It is not recommended to use the instrument in the case of a damaged container. Keep all
packing material until the inspection has been completed. If damage is detected, file a claim with carrier
immediately and inform the Dealer ,sales or authorized service facility nearest to you or Scientific.
If the contents in the container do not conform to the packing list, notify us or your dealer. Before putting this
instrument in operation, make sure you go through the manual, safety and Cautions guidelines.
Ensure that the environmental conditions are fulfilled. Ensure that the instrument is not be used in place with
vibrations, heating or exposed to sky , direct sunlight, for proper functioning and extensive life of service.
3.1 AC input mains connections
The mains AC socket ( IEC compatible ) is provided on the rear panel. Use the mains cord provided with the
instrument , alternative ensure appropriate rating cable is used for connections as per the standard mains cord
used in your country. This power supply unit is operated from 207 to 270 V , 47 Hz to 63 Hz.
3.2 Cooling
The power supply unit is forced air cooled, it has two
internal fans, the speed of the fans depends on the
temperature of internal heat sinks. The air movement is
from front to rear. Allow approximately 10 cms of free
space on front and rear of the instrument, for free air
movement. This allows stacking power supplies one
above other and in 19” rack cabinets. For prolonged life
of the power supply, the inlet temperature of air should
be below 35°C. The instrument control circuit senses
heat sink temperature and adjust the fan speed
accordingly. Thus the speed is controlled in pulsating
mode, during this period , high pitch sound may
produced, this is normal.
3.3 Use of instrument on table top
The power supply does not need any additional fitting /
assembly of part. Ensure that the instrument feet are
mounted on bottom side of the power supply unit. If not
using appropriate screw driver, fix the instrument feet ( 4
nos. ) provided with unit.
User Manual PSA3200
Power Supply
Top View
Air Inlet
Air Outlet
Install 4 nos. of
Instrument feets supplied
with the instrument
17

3.4 Use of instrument in 19” rack mounting cabinet
This power supply unit is designed to fit in standard 19” rack mount cabinet. it requires few parts to be
installed before placing it in cabinet.
1. Use the front panel rack mount brackets and fix it on left and right side of the instrument as shown
below. Figure below shows mounting of screws on right side, repeat the same for left side.
2. Use the rear panel support plate , if available , fix it on rear sides of the instrument, shown below.
Else order the Rear Panel Support Plates optional available.
Caution !
Ensure that the supplied screws used for mounting only, else use appropriate screws of
size M3x 6 mm. Ensure that they do not penetrate more than 6 mm inside.
User Manual PSA3200 18

3.5 First time operation power ON
Prior to power ON , ensure the followings,
- POWER On/Off switch on front panel is in Off position.
- There is no condensation on the unit, if any, allow some time to get it dry.
- Slide switches on the rear panel are set to default (front panel control) positions as shown below.
- Remote sense wires are connected as shown below, if not, make the connection as shown.
Pin 1 L – Local sense –
Pin 2 S – Remote sense –
Pin 3 NC Not connected
Pin 4 S + Remote sense +
Pin 5 L + Local sense +
The five pin sense plug can be pulled out from the socket, place the wires and re-insert the plug in
sense terminal socket.
3.5.1 AC mains input
This power supply unit is designed for 207 to 270 V, 50 Hz / 60 Hz.
Caution !
1. The Power Supply Unit must be connected to mains inlet having earth connection.
2. For safety the chassis of this unit is connected to protective earth potential.
3. Do not interrupt earth connection, else chassis will be floated and unsafe. Personal touching
in this case liable to get electric shock.
4. Do not touch lead-wire connected with output terminal when the output is ON. Do not touch
such parts immediately after output is cutoff. Failure to do so could result in serious injuries or
could be fatal.
5. When the mains cord is connected , even in power off conditions, few components in power
supply unit is still connected to the AC mains. To avoid any electrical shock, first remove the
mains cord, wait for two to three minutes, before opening the instrument cover.
3.5.2 Connecting to AC mains
- Connect the AC mains inlet cable, after ensuring correct
AC mains availability. Use mains plug given in standard
accessories. Connect appropriate cable rating, to
connect ac mains.
- Switch the POWER switch to ON position.
- The display will lit, this means the power supply is
connected to AC mains and power supply is ready to use.
- Switch the POWER switch to Off position.
User Manual PSA3200 19

User Manual PSA3200
3.5.3 DC output check
- Connect the DVM/DMM in appropriate voltage range depending on power supply output voltage.
- Press the push button “Output”, the associated output LED will light, indicating the output is available
on bus bar at the rear panel.
- Rotate the Voltage control potentiometer, the displayed voltage will vary with potentiometer variation.
- Observe the DMM reading and check with power supply display reading, the DMM reading should be
within the stated accuracies of the output voltage.
- The minimum voltage reading is close to zero to maximum voltage as per specification of the model.
- Press the push button “Output”, the DC output will be switched off and output LED will be off.
- Switch Off the AC power switch.
3.5.4 DC constant current check
- Connect the DC shunt across the power supply output terminals with appropriate cables of current
capacity. Ensure that the shunt and wire capacities are more than the power supply power.
- Connect the DMM in mV range across the DC shunt .
- Switch the POWER to ON position.
- Press and hold the “Set” push button, the associated output LED will light, indicating that voltage and
or current now can be set , before the output is switched ON.
- Rotate the Voltage control potentiometer, such that the voltage set is approx. 1.00 Volts
- Rotate the Current control potentiometer, such that the current set is approx. 1.00 A.
- Press the “Output” push button, the associated output LED will light, indicating the output is available
on bus bar at the rear panel.
- Observe the DMM reading and compare it with the current displayed reading, it should be in specified
accuracy.
- The minimum to maximum constant current can be checked with connecting the appropriate DC
shunts.
- Press the push button “Output” , the DC output will be switched off and output LED will be off.
- Switch off the AC power switch.
These two simple tests, ensure that the power supply is largely working and further can be checked and tested
for the other modes and features after going through manual.
In Description chapter, all the features and modes are explained in details. Request to go through each for
better understanding and use.
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