Scientific PSD7303A User manual

Programmable DC Power Supply
PSD7303A/PSD7303B
User Manual

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Copyright © Scientific All rights reserved.
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 supersedes 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.
Rev 1.00/ 1215

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Table of Contents
General Safety Summary ........................................................................4
Safety Terms and Symbols........................................................................... 5
Brief Introduction.......................................................................................... 6
Chapter 1 Start Guide ….............................................................................. 7
General Inspection................................................................................. 8
Safety Considerations .....................................................................................9
The front panel..................................................................................... 10
User interface .................................................................................. 13
The rear panel ................................................................................. 14
Output check .................................................................................... 15
Chapter 2 Control panel operation ............................................................ 16
2.1 Output summary ............................................................................ 17
2.2 CH1/CH2 Independent Output ...................................................... 18
2.3 CH3 Independent mode ................................................................ 19
2.4 CH1/CH2 Series mode ................................................................. 20
2.5 CH1/CH2 Parallel mode ............................................................... 21
2.6 LAN setting ................................................................................... 22
2.7 Save and Recall ............................................................................ 23
2.8 Timer ............................................................................................. 24
2.9 Waveform display ......................................................................... 27
2.10 Version information ..................................................................... 28
2.11 Upgrade firmware ....................................................................... 29
Chapter 3 Remote control .......................................................................... 32
3.1 Syntax Conventions...........................................................33
3.2 Command list................................................................................. 34
3.3 Command description.................................................................... 35
Chapter 4 Service and Support ..............................................................42

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General Safety Summary
Please review the following safety precautions carefully to avoid
personal injury or damage to this product or any product connected to it. To
prevent potential danger, please use the instrument as specified.
Use proper power cord
Only the power cord designed for the instrument and authorized by
local country could be used.
Power supply
AC Input Voltages: 100V/110V/220V/230V ±10%, 50/60Hz.
Use proper fuse
The fuse types: 100V/110V: T6.3A/250V; 220V/230V: T3.15A/250V; Make
sure to use the correct type of fuse before turning on the instrument. Do not
connect the power cord before replacing the fuse. Find out the reason why
the fuse burned out before replacing the fuse.
Ground the instrument
The instrument is grounded through the protective terra conductor of the
power cord. To avoid electric shock, the grounding conductor must be
connected to the earth. Make sure that the instrument is properly grounded
before any inputs or outputs.
Observe all terminal ratings
To avoid fire or electric shock, please observe all ratings and symbols on
the instrument. Read this guide carefully to know more details about the
ratings before connection.
Keep proper ventilation
Inadequate ventilation may cause an increase of temperature, which will
lead to further damage. Please keep proper ventilation and check the
fan and air-vents regularly when using the instrument.
Operate condition
Location: indoor, no strong light, almost no Interfering
pollution; Comparative humidity: <80%
Altitude: <2000m
Temperature: 0℃to 40℃
Do not operate in an explosive atmosphere
To avoid personal injury or damage to instrument, please do not operate in
an explosive atmosphere.Keep surface of the product clean and dry
To avoid dust or moisture in the air influence the performance of
the instrument , please keep surface of the product clean and dry.

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Safety Terms and Symbols
Terms may appear on the product:
DANGER: Indicates direct injury or hazard that may happen.
WARNING: Indicates potential injury or hazard that may happen.
CAUTION: Indicates potential damage to the instrument or other property
that may happen.
Symbols may appear on the product:

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Brief Introduction
PSD7303A/7303B Programmable DC Power Supply is convenient, flexible
and multi-function. It has three independent outputs, two sets of adjustable
voltage value and a fixed set of selectable voltage value of 2.5V, 3.3V, and
5V, and it also provides output short circuit and overload protection at the
same time.
Main features of PSD7303A/7303B
4.3” TFT color LCD display with content of 16M;
Three independent outputs, two of which are adjustable, and the
total power up to 195W;
Four kinds of input voltage values includes 100V, 110V, 220V and 230V
to satisfy different requirements;
Function of storage and call setting parameters;
Function of timing output ;
Function of waveform display, Real-time display of voltage or
current waveforms with digital display of voltage, current and power
values
Start up screen protective procedure every fixed interval(30 minutes)
Perfect PC software to realize the real-time control through USBTMC
and LAN.

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Chapter 1 Start Guide
In this chapter, we mainly introduce the panel and display Interface of
PSD7303A/7303B, as well as the new machine inspection and attentions at
first use. Reading this chapter will give you a quick understanding on
operation.
Brief introduction:
General Inspection
The front panel
The rear panel
User interface
The rear panel
Output check

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General Inspection
Please check the instrument according to the following steps.
1. Inspect the shipping container.
Keep the damaged shipping container or cushioning material until the
contents of the shipment have been completely checked and the instrument
has passed both electrical and mechanical tests.
The consigner or carrier will be responsible for damages to the instrument
resulting from shipment. Scientific would not provide free maintenance or
replacement.
2. Inspect the instrument.
If there are instruments found damaged, defective or failure in electrical and
mechanical tests, please contact Scientific.
3. Check the accessories.
Please check the accessories according to the packing list. If the
accessories are incomplete or damaged, please contact Scientific.

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Safety Considerations
To ensure that the instrument can work normally, please conduct
necessary inspection before using the PSD7303A/7303B
Input Power Requirement
The PSD7303A/7303B allows a 50Hz/60Hz frequency, and four levels of AC
power: 100V/120V/220V/230V. You can select wanted power voltage with
the “DIP Switch” at the rear panel according to the actual demand.
Electrical Check
Please use the power cord provided as accessory and connects the
instrument to AC power. Check the power as the following steps.
1. Connect the power supply
2. Turn on the power switch
Press the button POWER to enter boot interface, and system return to
the default settings after a while.
To switch to the wanted power voltage, please disconnect the
power cord first.
Warning
Warning
To avoid electric shock, please make sure that the instrument is
grounded correctly.

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The front panel
Description
1. Logo
2. Display Area
3. Model
4. System Parameter Configuration Button
5. Multi-function knob
6. Fine Adjust button
7. Right/Left Direction button
8. Channel Control Button
9. CH3 DIP switch
10. Power Switch
11. CH1 output terminal
12. Ground Terminal
13. CH2 Output Terminal
14. CV/CC Indicator Light
15. CH3 Output Terminal

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Buttons for setting parameters
Press the button to turn on/off the waveform display interface;
Press the button to set series mode of CH1/CH2, and the logo
displays at the same time;
Press the button to set parallel mode of CH1/CH2, and the logo
displays at the same time;
Press the button to enter the LAN setting and storage function
interface
Press the button to enter timer setting interface
Press the button longer to turn on/off the keylock function and
shorter to turn to system information interface
Buttons for controlling the channel
Press the button to turn on/off all the channels;
Press the button to select CH1 as the current channel;
Press the button to select CH2 as the current channel;
Press the button to turn on/off the output of current channel
Press the button to turn on/off the CH3 output

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Select the digit position by moving the cursor around
Right/Left Direction button. Press the button to move the cursor
around
The output terminal on front panel
The output terminals of CH1, CH2 and CH3 include positive terminal and
negative terminal, and a common ground for CH1 and CH2 additional.
Each channel has its own logo. The operation details are introduced
in the follow-up ”control panel operation”.

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User interface
1. Parallel/Series logo: The logo will be displayed when the corresponding
mode is on.
2. Channel logo
3. Operating mode logo: The corresponding logo will display when
working in CV or CC mode;
4. LAN logo: It will display when there is a LAN connection
5. USB logo: It will display when there is a USB connection;
6. Voltage value;
7. Current value;
8. Power value;
9. Timer lD: Timer state identification
10. Channel on/off logo;

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The rear panel
○
1 warning message
○
2 The DIP switch of the AC power and its identification.
○
3 The description of the AC input voltage
○
4 AC power socket
○
5 The fan air vents
○
6 CE certification mark
○
7 USB interface and identification
○
8 LAN interface and identification
○
9 TÜV certification mark

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Output Check
The output check includes voltage check in condition of all channels with no
load and current check in condition of short circuit so as to make sure that
the instrument correctly responds to operation of the front panel.
1. Voltage output check
1. Within no load, turn on the power, and make sure the setting current
values of all channels are not zero;
2.Turn on CH1/CH2 and the instrument work in constant voltage
mode.
Check whether the voltage value could be changed from 0V to 32V.
2. Current output check
1. Turn on the power, and make sure the setting current values of all
channels are not zero;
2. Use an insulated wire to connect the positive and negative
t erminal of CH1/CH2;
3. Turn on CH1/CH2 and the instrument work in constant current
mode.
Check whether the current value could be changed from 0A to 3.2A.

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Chapter 2 Control panel operation
In this chapter the function and operation of PSD7303A/7303B control panel
will be introduced in detail to give you an all-around understanding of it,
which will eventually lead to easier work. Brief introduction:
Output summary
CH1/CH2 independent output
CH3 independent output
Series output
Parallel output
LAN setting
Save and recall
Timer
Waveform display
Version information
Upgrade firmware
Keylock

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2.1 Output summary
PSD7303A/7303B have three independent outputs, two of which are
adjustable in voltage value and the other one includes selectable 2.5V, 3.3V
or 5.0V
Independent/Parallel/Series
PSD7303A/7303B have three output modes: independent, parallel and
series, which can be selected through the track switch on the front panel.
In the independent mode, the output current and voltage are controlled
respectively. In the parallel mode, the current value is twice that of the
single channel. In the series mode, the voltage value is twice that of the
single channel.
Constant voltage/current
In the constant current mode (independent or tracking mode), the current
value is rated and controlled through the front panel. The indicator light
displays red and the voltage value is under rating. It will return to constant
voltage mode when the current value is under dating.
In the constant voltage mode, the current value is less than the setting
value, and the voltage value is controlled through the front panel. The
indicator light displays yellow and the current value is maintained at the
set value. It will return to constant current mode when the voltage value is
under dating.

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2.2 CH1/CH2 Independent Output
Instruction
CH1 and CH2 are working in the independent mode, at the same time，they
are insulated from the ground.
Output rating 0~32V/0~3.2A
Operation steps
1. Make sure that parallel/series mode is off.
2. Connect load to the positive and negative terminals of CH1/CH2.
3. Set voltage and current value of CH1/CH2:
a) Press “1”/”2” button to select the wanted channel
b) Move the cursor through direction button to select the
wanted parameter(voltage, current),
c) Press “Fine” to select the digit position and then revolve
the multi-function knob to change the corresponding parameter.
4. Turn on the output ：
Press “on/off” button to turn on the output, the corresponding indicator
light gets lighted immediately and “CC” or “CV” is showed on the
current interface.

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2.3 CH3 Independent mode
Instruction
CH3 is independent from CH1 and CH2, and it works neither in parallel
mode nor in series mode. Its voltage and current ratings are respectively
2.5V, 3.3V, 5V and 3.2A.
Output ratings 2.5V/3.3V/5V, 3.2A
Operation steps:
1. Connect the load to the positive and negative terminals of CH3 on the
front panel.
2. Select the wanted voltage value by moving CH3 “DIP switch”.
3. Turn on the output:
Press “on/off” button to turn on the output, the corresponding indicator
light gets lighted immediately.
When the current value is higher than 3.2A, the overload indicator light
turns red and the working mode turns to CC from CV
Note: “overload” does not mean abnormal operation.

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2.4 CH1/CH2 Series mode
Instruction
In the series mode, CH1 and CH2 are linked internally into one channel
which is controlled by CH1, and the output voltage value is twice compared
with that of single channel.
Output rating 0~64V/0~3.2A
Operation steps：
1. Press the “Ser” button to start the Series mode, the indicator light turns
bright immediately and the logo displays at the top of screen.
2. Connect the load to the positive terminal of CH2 and the negative terminal
of CH1;
3. Set voltage and current value:
a) Press “1” button to select the channel 1
b) Move the cursor through direction button to select the
wanted parameter(voltage, current),
c) Press “Fine” to select the digit position and then revolve
the multi-function knob to change the corresponding parameter.
4. Press “on/off” button corresponding CH1 to turn on the output
Note: You can identify the current working state “CC” or ”CV” by referring to
indicator light of CH1/CH2.(red means CV, yellow means CC)