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DC POWER SUPPLY 
 
Users Manual 
 
 
 
 
 
 
 
 
 
 
 
V
C.V.
INE COARSE
VOLTAGE
A
V
OFF+_ ON
VOLTAGE
CURRENT
DC POWER 
SUPPLY
FINCOARSEFINE
CURRENT
C.C.
POWER
OFFON
 
 
Table of Contents 
 
CHAPTER 
1. Introduction ……………………………………………………………… 1-1 
 Unpacking and Inspection ……………………………………………………………… 1-2 
 Safety Precautions ……………………………………………………………… 1-2 
 Safety Information ……………………………………………………………… 1-3 
 Safety Symbols ……………………………………………………………… 1-3 
 Instrument Front Panel ……………………………………………………………… 1-4 
 Instrument Back Panel ……………………………………………………………… 1-6 
2. Operation ……………………………………………………………… 2-1 
 Line Power Supply Setting ……………………………………………………………… 2-1 
 Operation Procedure ……………………………………………………………… 2-3 
3. Specifications ……………………………………………………………… 3-1 
 General Specifications ……………………………………………………………… 3-1 
 Technical Parameters ……………………………………………………………… 3-2 
4. Maintenance ……………………………………………………………… 4-1 
 Replacing the Fuse ……………………………………………………………… 4-1 
 
 
 
 
Chapter 1 
Introduction 
 
This manual contains information and warnings, which must be followed to ensure safe operation and retain the DC power 
supply in safe condition. 
 
 
 WARNING 
READ “SAFETY INFORMATION” BEFORE USING, INSTALLING OR 
MAINTENANCE THE INSTRUMENT. 
 
The DC power supply series are a bench top single output variable DC power supply. Stable regulated DC power supplies 
allowing continuous adjustment of both the output voltage and output current levels. They have been designed according to 
IEC1010–1 concerning safety requirements and comply with. 
There are three display types for the power supply series monitoring output voltage and current. They are LCD, LED and two 
pointer meters. One of them is equipped to the DC power supply. There are different numbers of output voltage and output 
current ranges for the DC power supply series, too. These difference models of the DC power supply are available for choice 
of user. 
The output voltage and current range and equipped display type of the DC power supply series as follows: 
DISPLAY TYPE OUTPUT VOLTAGE 
(regulated) 
OUTPUT CURRENT 
(regulated) LCD LED POINTER METER 
0~2A · · · 
0~15V 
0~3A · · · 
1-1 
Introduction 
DC Power Supply Series 1 
 
DISPLAY TYPE OUTPUT VOLTAGE 
(regulated) 
OUTPUT CURRENT 
(regulated) LCD LED POINTER METER 
0~2A · 
0~18V 
0~3A · 
0~2A · · · 
0~3A · · · 
0~5A · · · 
0~10A · 
0~30V 
0~20A · 
0~2A · 
0~50V 
0~3A · 
These difference models of the DC power supply are available for choice of user. 
 
Unpacking and Inspection 
The packing should include the following items: 
1．DC power supply 
2．Power line cord 
3．Instruction manual 
4．Spare fuse 
Please check to see that all of the above items are included. 
 
 Safety Precautions 
1. Before applying power to your DC power supply, make sure that power select switch is correctly setting for you applicable AC 
 1-2 
DC Power Supply 
Users Manual 
 
 
 Safety Information 
The DC power supply series has been designed according to IEC1010 – 1 concerning safety requirements for electrical 
measuring instruments with an overvoltage category (300V CAT II) and pollution 2. 
 
Safety Symbols 
 Important safety information, refer to the operating manual. 
 DC – Direct current. 
 Earth ground. 
 
1-3 
 
2. 
3. 
4. 
power supply. 
Connect the instrument to an AC power source using the power line core provided. 
Do not connect a voltage that is greater than the current output voltage to the terminals of the instrument. 
Never ground yourself when taking electrical measurements. Keep your body isolated from ground by using dry clothing; 
rubber shoes, rubber mat, or any approved insulating material. 
5. Never touch exposed wiring, connections or any live circuit when attempting to take measurements. 
6. Avoid shorting circuit the output of DC power supply. 
7. Set the voltage and current adjustment knobs as you desire. 
8. The unit should be stored in a dry and well ventilated place and the power cord removed if storing for long periods. 
Introduction 
Safety Precautions 1 
 
 Caution! Hot surface. Avoid contact. 
 Conforms to European Union directives. 
 
Instrument Front panel 
 Figure 1-1 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1-4 
30/50V 2/3/5A15/18V
_ +
5
3
2
910 11 12
13
1
OFF ON
VOLTAGE
CURRENT
DC POWER 
SUPPLY
FINE
1
7
8
4
6
5
3
2
12119 10
ON OFF
POWER
VOLTAGE
C.V.C.C.
COARSE
CURRENT
FINE COARSE
13
DC Power Supply 
Users Manual 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1. OUTPUT VOLTAGE INDICATOR 
This indicator shows output voltage as measured at the output terminals. 
There is LCD or LED or pointer meter display type. They are available for choice of user. 
2. OUTPUT CURRENT INDICATOR 
This indicator shows output current as measured at the output terminals. 
There is LCD or LED or pointer meter display type. They are available for choice of user. 
3. COARSE(MAIN) VOLTAGE REGULATOR 
1-5 
30V 10/20A
12119
8
7
6
5
4
3
2
10
1
FINE COARSE
300V
CATⅡ
VOLTAGE
C.V.
COARSEFINE
CURRENT
C.C.
ON OFF
POWER
Introduction 
Instrument Front Panel 1 
 
 Adjust output voltage of the DC power supply. 
4. FINE VOLTAGE REGULATOR 
This is a fine control. Adjust output voltage of the DC power supply. 
5. COARSE(MAIN) CURRENT REGULATOR 
Adjust output current of the DC power supply and delivered. 
6. FINE CURRENT REGULATOR 
This is a fine control. Adjust output current of the DC power supply and delivered. 
7. C.C. INDICATOR 
Constant current mode indicator 
8. C.V. INDICATOR 
Constant voltage mode indicator 
9. POWER ON/OFF SWITCH 
This is main power switch of the instrument. 
10. NEGATIVE OUTPUT TERMINAL 
11. GROUND OUTPUT TERMINAL 
12. POSITIVE OUTPUT TERMINAL 
13. POINT METER ZERO (only pointer meter display) 
Each pointer meter has a mechanical screw adjustment for setting the zero point. Using a small screwdriver, turn off 
the power and adjust the screw under the meter respectively to read zero. There is only pointer meter model. 
 
Instrument Back Panel (Figure 1-2) 
1. HEAT SINK 
There is an on the heat sink. It indicates "caution! Hot surface avoid contact". 
2. POWER SELECT SWITCH 
1-6 
DC Power Supply 
Users Manual 
 
 Two kinds of power 220VAC and 110VAC 50Hz/60Hz can be supplied to the instrument. According to user’s needs, 
setting it 
3. FUSES 
There are two fuses in the AC power input socket. One is in use and the other is for spare part. 
 
The fuse of The DC power supply series as follows: 
OUTPUT VOLTAGE 
Regulated 
OUTPUT CURRENT 
regulated 
FUSE TYPE 
line 220VAC 
FUSE TYPE 
line 110VAC 
0~2A T 1A L 250V T 2A L 250V 
0~15V 
0~3A T 1A L 250V T 2A L 250V 
0~2A T 1A L 250V T 2A L 250V 
0~18V 0~3A T 1A L 250V T 2A L 250V 
0~2A T 1A L 250V T 2A L 250V 
0~3A T 2A L 250V T 4A L 250V 
0~5A T 3.15A L 250V T 6.3A L 250V 
0~10A T 5A L 250V T 10A L 250V 
0~30V 
0~20A T 8A L 250V T 15A L 250V 
0~2A T 2A L 250V T 4A L 250V 
0~50V 
0~3A T 3.15A L 250V T 6.3A L 250V 
 
4. AC POWER INPUT 
1-7 
Introduction 
Instrument Back Panel 1 
 
Figure 1-2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1-8 
30V 20A
30/50V 2/3/5A15/18V
30V 10A
4
3
1
198TO242V
 50/60Hz
220
!
98TO122V
 50/60Hz
CAUTION
 
~
4
3
~
2
1
 CAUTION!
HOT SURFACE.
AVOID CONTACT.
! FUSE:XXXXXXXX
4
1
3
198 TO 242V
 50/60Hz
98 TO 122V
 50/60Hz
!
220
CAUTION
~ ~
4
3
1
2
DC Power Supply 
Users Manual 
 
 
 
 WARNING 
To avoid user for injury and the instrument for damage, the voltage value of AC power 
must be examined with same the power requirements of instrument before connect power 
cord to live power source. 
 
 
 
 
 
 
 WARNING 
To avoid electrical shock, disconnect power cord from live power source and remove the 
test leads and any input signals before replacing the powerfuses. Replace it only with the 
same type of fuses. 
 
 
 
 
 
 
 
 
1-9 
 
 
 
Chapter 2 
Operation 
 
Introduction 
 
 WARNING 
To avoid electric shock or personal injury, read “Safety Precautions” and “Safety 
Information” before Operation. 
 
Before making any operation always examine the DC power supply and accessories used with it for damage, contamination 
(excessive dirt, grease, etc.) and defects. Examine the test leads for cracked or frayed insulation and make sure the lead plugs 
fit snugly into the output jacks. If any abnormal exist do not attempt to make any operation. 
 
Line Power Supply Setting (Figure 2-1) 
(Only for the instrument with POWER SELECT SWITCH ) 
Two kinds of AC line, 220VAC 50Hz/60Hz or 110VAC 50Hz/60Hz, can be supplied to the instrument. Set it with a screwdriver to 
adapt your AC line. 
Check to be sure that power select switch on back panel is switch to correct line voltage. 
Check to be sure that fuse is correct rating current. 
 
 
 
2-1 
98TO122V
 50/60Hz
220
110
! CAUTION
 
198TO242V
 50/60Hz
~ ~
198TO242V
 50/60Hz
CAUTION
 
!
98TO122V
 50/60Hz
~ ~
DC Power Supply 
Users Manual 
 
 
Figure 2-1 
 
 
 
 
 
 
 
 
 
 
 
 CAUTION 
The applicable AC power supply range is: 
220VAC ± 10% (198 to 242V~) 50Hz/60Hz or 110VAC ± 10% (98 to 122V~) 50Hz/60Hz. 
NOTE: The instrument without POWER SELECT SWITCH is factory pre-set in accordance with your main voltage when your 
local distributor place the order with the factory. 
 
 
2-2 
Operation 
Operating Procedure 2 
 
Operating Procedure 
CONSTANT VOLTAGE MODE 
1. Turn the voltage regulator anti-clockwise to minimum position and the current regulator clockwise to maximum position. 
2. Press the power ON / OFF switch to ON. 
3. Turn the voltage regulator clockwise to that you are desirous of output voltage value. 
4. Connect the positive output terminal and negative output terminal with a load or similar component. 
5. The voltage regulator controls the output voltage indicator. Indicator shows that output voltage of the output terminals. 
 
CONSTANT CURRENT MODE 
1. Turn the voltage regulator clockwise to maximum position and the current regulator anti – clockwise to minimum 
position. 
2. Press the power ON/ OFF switch to ON. 
3. Connect the positive output terminal and negative output terminal with a load or similar component. 
4. Turn the current regulator clockwise to that you are desirous of output current value. 
5. The voltage regulator controls the output voltage indicator. The current regulator controls the output current indicator. 
Indicator show that output voltage and current of the output terminals. 
 
RESTRICTED CURRENT PROTECTION MODE 
1. Press the power ON/ OFF switch to ON. 
2. Turn the current regulator anti-clockwise to minimum position then clockwise a little. 
3. Turn the voltage regulator clockwise to that you are desirous of output voltage level position (approx.1.5V). 
4. Link the positive and negative output terminals with a wire. 
5. Turn the current regulator clockwise to get the current level at which the restricted current protection will be active as 
you desire. 
2-3 
DC Power Supply 
Users Manual 
 
 
6. Remove the wire linked to the positive and negative output terminals. Connect the positive output terminal and negative 
output terminal with a load or similar component. 
7. When the output current achieves the setting value of restricted current protection, and the restricted current protection 
is active. 
NOTE: After setting of the restricted current protection, if the current regulator is turned again, the restricted current protection 
range will be changed. 
 
C.C. AND C.V. INDICATOR (Only for the instrument with C.C. and C.V. INDICATOR ) 
The C.C. indicator is controlled by the constant current mode. Otherwise C.V. indicator is controlled by the constant voltage 
mode. 
 
 CAUTION 
The DC power supply series has perfect restricted current protection, Even so, when the output terminal is short - circuit, the DC 
power supply should be turned off and the short - circuit should be removed before continuing operation because the power 
transistors in the instrument will bear heavy. 
The AC power must be switched off before servicing and servicing should be referred to a qualified person. 
 
 CAUTION 
Using this appliance in an environment with a strong radiated radio - frequency electromagnetic field (approximately 3V/m) may 
influence its measuring accuracy. 
 
 
 
 
2-4 
 
 
 
Chapter 3 
Specifications 
 
General Specifications 
 
Safety: Designed comply with IEC 1010 -1 specifications. CAT.Ⅱ300V 
Temperature: 0℃ to 40℃ for operating, -10℃ to 50℃ for storage 
Under 75% rated output power for continuous, upward of 75% rate output power for one 
hour. 
Relative Humidity: 20% to 80% RH (0℃ to 40℃). 
Protection: constant current and short - circuit protection 
 
Weight & Size 
OUTPUT VOLTAGE (regulated) OUTPUT CURRENT (regulated) WEIGHT SIZE 
0~2A Approx. 3kg 206(L) ´ 110(W)´ 153(H) mm 
0~15V 
0~3A Approx. 4kg 206(L) ´ 110(W)´ 153(H) mm 
0~2A Approx. 4kg 206(L) ´ 110(W)´ 153(H) mm 
0~18V 0~3A Approx. 4.5kg 206(L) ´ 110(W)´ 153(H) mm 
0~2A Approx. 4kg 291(L) ´ 136(W)´ 158(H) mm 
0~30V 
0~3A Approx. 5kg 291(L) ´ 136(W)´ 158(H) mm 
 
 
3-1 
DC Power Supply 
Users Manual 
 
 
OUTPUT VOLTAGE (regulated) OUTPUT CURRENT (regulated) WEIGHT SIZE 
0~5A Approx. 3kg 291(L) ´ 136(W)´ 158(H) mm 
0~10A Approx. 12kg 365(L) ´ 265(W)´ 164(H) mm 0~30V 
0~20A Approx. 15kg 365(L) ´ 265(W)´ 164(H) mm 
0~2A Approx. 5kg 291(L) ´ 136(W)´ 158(H) mm 
0~50V 0~3A Approx. 6kg 291(L) ´ 136(W)´ 158(H) mm 
 
 
Technical Parameters 
Input voltage : 
220V AC ± 10% 50HZ/60HZ ± 2HZ or 110V AC ± 10% 50HZ/60HZ ± 2HZ 
Voltage indication accuracy: 
LED display and LCD display ±1%±2digits, Pointer meter display 2.5% 
Current indication accuracy: 
LED display and LCD display ±2%±2digits, Pointer meter display 2.5% 
 
Output Voltage and Current: 
OUTPUT VOLTAGE (regulated) OUTPUT CURRENT(regulated) 
0~2A 
0~15V 
0~3A 
0~2A 
0~18V 
0~3A 
0~2A 
0~30V 
0~3A 
3-2 
Specifications 
Technical Parameters 3 
 
Output Voltage and Current: 
OUTPUT VOLTAGE (regulated) OUTPUT CURRENT(regulated) 
0~5A 
0~10A 0~30V 
0~20A 
0~2A 
0~50V 
0~3A 
 
Source Effect(Line regulation): CV≤0.01%+1mV CC≤0.2%+1mA 
Loading Effect(Load regulation): CV≤0.01%+3mV CC≤0.2%+3mA 
Ripple and noise: CV≤0.5mVr.m.s CC≤3mAr.m.s 
 
To obtain the stability guarantee of source and loading effect, allow the instrument to warm up for at least 15 minutes. 
 
 
 
 
 
 
 
 
 
 
 
 
3-3 
 
 
 
Chapter 4 
Maintenance 
 
Introduction 
Do not attempt to repair or service your instrument unless you are qualified to do so and have the relevant calibration, 
performance test, and service information. 
 
Replacing the Fuse 
 
 
 WARNING 
Turn off the power switch, remove the power line cord from the power socket and 
disconnect the test leads at output terminals before replacing the fuse. Replace it only with 
same type of fuse. 
 
 
 
 
 
 
 
 
 
4-1 
Maintenance 
Replacing the Fuse 4 
 
Figure 4-1 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4-2 
15/18V FUSE
DC Power Supply 
Users Manual 
 
 
Figure 4-2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4-3 
30/50V FUSE
!
220
198TO242V
 50/60Hz
98TO122V
 50/60Hz
CAUTION
 
~ ~
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 WLS303 
 
设 计
审 核
日 期
日 期 料
日 期
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重 量 比 例批 准
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号
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本
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首次用于深圳华谊仪表公司
共 张 第 张
MASTECH HY3010
电路原理图(1)
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HY3010的电路原理图（2）借用：HY3020的电路原理图（2）