Tenma 72-2660 User manual

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User Manual
Switch Mode DC Power Supply
Introduction
Thank you for selecting the Tenma Switching DC Power Supply, please read this user guide before the operation.

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User Manual
Safety
This manual contains important safety and operation instructions for correct use of this power supply. Read through the manual
and pay close attention to the labels of this unit to be connected.
Do not install substituted parts or operate the modication without permission, please contact your distributor repair, questions,
or for warranty replacements to guaranty of the stability of the unit.
Pay special attention to the information of WARNINGS or CAUTIONS to avoid the damage to power supply or connected
equipment—which could lead to human injury.
Safety Marks
WARNING:
Failure to observe these warnings may cause injury to users and damage to power supply or connected equipment.
CAUTION:
Failure to observe these warnings may result in damage to equipment and improper functioning of power supply.
Ground
High Voltage
Attention on the Warning or Caution
Specication Compliance
72-2660 Switch Mode DC Power Supply is compliance with the specication described in this manual.
The content or specication of this manual is subject to change, without prior notice.
Product Features
The 72-2660 is the single output switch mode DC power supply with a maximum 30V output voltage, 3.75A output current and
maximum output power of 50W.
72-2660 integrates the AC/DC and DC/DC 2nd level voltage regulator technology, the AC/DC input is adapts to a worldwide
voltage range. The DC/DC uses a buck converter, which is highly efcient and high speed dynamic response performance.
72-2660 can set the voltage and current through the keypad of front panel and save the setting groups for efcient and
functional usage.
72-2660 also features a four-digit voltage and current meter, as well as the compact handheld size. The 72-2660 is perfect for
solving a variety of loading conditions and applications.
The main features of the 72-2660 include:
• Handheld design
• Fanless cooling for silent operation
• Four digit LCD display
• Output short circuit protection
• High speed dynamic response
• Automatic protection under power off status
• Automatic output recognition of USB charging port

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User Manual
1. Quick Start
This chapter describes the basic check points on 72-2660 for proper operation, as well as the functions of 72-2660.
1.1 Front Panel Description
Current Setting Indicator
Voltage Setting Indicator
Measured Value Display
Keypad
USB Charging Ports
DC Output Terminals
Current Setting Indicator
1.2 Pre-Check
Before the operation, please check the included accessories; if any are missing, please contact the local distributor.
Power Cord – 1PC
User Guide – 1PC
Connect the power cord to the unit and to a properly grounded outlet, and switch on 72-2660. The unit starts the self-system
checking, the LCD displays 0.5s, date of manufacturing, production lot, model number version number in turn.
1.3 Quick Start
OUT Button
Press the OUT button to begin outputting the selected voltage and current. The unit will display the voltage or current on the
screen. Press again OUT button to exit output function.
UP Arrow Key + DOWN Arrow Key
Press UP arrow key to activate the LCD backlight
Press DOWN arrow key to exit the LCD backlight
LEFT Arrow Key + RIGHT Arrow Key
Press LEFT arrow key to decrease the contrast of LCD
Press RIGHT arrow key to increase the contrast of LCD

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V/A Key
Press the V/A key to activate voltage measurement and read the voltage value from display.
Push the V/A key again to switch current measurement and read the current value from the display
USB Button
Push the USB button and adjust voltage to 5.2V and the current as 3A to enter USB power mode; then, push the OUT button
to output the selected 5.2V at 3A.
Push the USB button again and USB button lights out to exit USB power charging mode.
SET Button + V/A Button + Direction Arrow Keys
Push the SET button, and press the direction arrow keys to adjust the voltage value setting, Push the V/A button to switch to
the current value setting, and press the direction arrow keys to measured current value.
1.4 Output Check
1.4.1 The output voltage regulation mode check
This is for checking the functions of power supply under non-load voltage stability.
1. Switch on the product, the power is off and the indicators of CC & CV are light off.
2. Push the OUT button, the CV indicator is shown on the LCD display.
3. Setting the voltage of power supply:
Push the V/A button and shift to voltage display mode. Then adjust voltage values, and the voltage value displayed on the
LCD is approaches the settled voltage value and within the tolerance, current value is showed as 0A.
4. Make sure the voltage can be adjusted from 0.3V to max. 30V.
1.4.2 The output constant current mode check
This is for checking the functions of power supply under constant current mode.
1. Switch on the product, the power is off and the indicators of CC & CV are off.
2. Adjust voltage value to 30V.
3. Connect the resistance (3Ω/50W) between output terminals.
4. Push the OUT button, the indicator of CC also displays on the LCD.
5. Setting the current of power supply:
Push V/A button and shift to current display mode. Then adjust current values, and check that the current value displayed
at LCD is approaching the settled current value and within the tolerance.
6. Make sure the current can be adjusted from 0A to the maximum value.
1.4.3 The output short circuit protection check
This is for checking the function of short circuit protection of output.
1. Switch on the product, the power is off and the indicators of CC & CV are light off.
2. Adjust voltage value is over 5V and current value is over 1A.
3. Push the OUT button.
4. Connect the output terminals by wire for short circuit, the light of OUT button is off and output off.
1.4.4 The USB charging function check
This is for checking USB charging function.
1. Switch on the product, the power is off and the indicators of CC & CV are light off.
2. Push the USB button. Adjust the voltage as 5.2V and current as 2.5A.
3. Push the OUT button.
4. Make sure the power supply under CV mode, the CV indicator is light in LCD.
5. Sett the current value and make sure the current value can be adjusted from 0A to the maximum value of measuring range.
You cannot adjust voltage.

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2. Specication
2.1 Primary Specications
Input Voltage 90V AC ~ 265V AC / 43Hz ~ 65Hz ±2Hz
Input Current 1A
Output Rating Max. Voltage 0.3V~30V
Max. Current 0~3.75A
Line Regulation
±% of output + offset
Voltage CV%0.01%+3mV
Current CC%0.01%+3mA
Load Regulation
±% of output + offset
Voltage CV%0.02%+3mV
Current CC%0.02%+3mA
Measurement Accuracy Voltage 10mV
Current 1mA
Measured Value Accuracy @ 25°C
±% of output + offset
Voltage %0.05%+5mV
Current %0.05%+5mA
Measurement Speed Voltage 100ms/ones
Current 100ms/ones
Setting Value Accuracy @ 25°C
±% of output + offset
Voltage %0.05%+5mV
Current %0.05%+5mV
Ripple and Noise
20HZ-20MHz
Voltage %10mVrms/100mVp-p
Current %10mVrms/100mVp-p
Temperature Coefcient @ 0~40°C
±% of output + offset
Voltage %0.05%
Current %0.1%
Dimensions 185mm × 88mm × 38mm
Weight (Net ) 370g
2.2 Supplementary Specications
Build-in EEPROM
Recommended Calibration Time: Annually
AC Input Power: 90-265V AC, 43 to 65Hz
Operating Temperature: 0 to 40° C
Storage Temperature: -20 to 70° C
3. Operation
Check the rating label of the power supply and ensure that it complies with the AC voltage that is to be used.
Connect the power supply to the AC outlet using the provided power cord.
3.1 Keypad Description
OUT Output check
V/A Voltage & Current Shift
USB 5V Charging
SET/ENTER Voltage & Current Setting/Enter
STORE/RECALL Data Saving/Recall
UP DOWN LEFT RIGHT Direction Arrow Keys

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3.2 Front Panel
After powering on, the panel operation and all the functional buttons can be operated.
3.3 Voltage Setting
The voltage setting range is from 0.30V to 30V; follow the setting steps as below:
1. Switch on the power supply
2. Push the OUT button to stop power output
3. Push the SET/ENTER button, the max value ashes in the voltage setting area
4. Push the LEFT or RIGHT arrow keys to move the cursors
5. Push the UP or DOWN arrow keys to change the settings
6. Push SET/ENTER button to exit voltage setting mode
UP ENTER
OUT SET 0 0.0 0 V ------------- >3 0.0 0 V ---------------> OK.
Remark:
I. It is possible to set voltage values once the outputs are valid. However, for protection of the load, it is recommended to turn
off the output before setting the voltage.
II. Due to the total power limit, current settings will be decreased automatically as voltage setting increases.
3.4 Current Setting
The current setting range is from 0.000A to 3.750A, follow the setting steps as below:
1. Switch on the power supply
2. Push the OUT button to stop the output
3. Push and SET/ENTER button, the max value position ashes of voltage setting area.
4. Push the V/A button, the max. value position of current setting ashes and current setting is activated
5. Push the LEFT or RIGHT arrow keys to move the cursors
6. Push the UP or DOWN arrow keys to change the settings
7. Push SET/ENTER button and light off this button to exit current setting mode
UP ENTER
OUT SET V/A 0. 000 A ------------- >2.000 A ---------------> OK.
Remark:
I. It is possible to set current values once the outputs are valid. However, for protection of the load, it is recommended to stop
output before current setting.
3.5 Output Switch
Under the panel operating mode, push OUT button to shift output status. Once OUT button is on and lit up, the measured
values displayed at LCD; push OUT button again to exit output mode.
3.6 Data Saving Operation
1. Under the voltage setting or current setting mode, push the STORE button to save the values of voltage or current into the
memory of power supply for future recall purpose.
2. Refer 3.3 or 3.4 for voltage or current setting mode.
3. Push STORE button to enter data saving mode, the minimum value position ashes and displays STORE icon on LCD.
4. Move UP or DOWN arrow keys to select storage group number.
5. Click ENTER button to conrm data saving, click STORE button to exit data saving mode.
UP
SET STORE 1 2 ENTER -----> OK.

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3.7 Recall Data Operation
Under normal operating mode, push the RECALL button for retrieving the saved data from memory; follow the setting steps
as below:
1. Switch on the power supply
2. Push RECALL button to enter data recall mode, the minimum value position ashes and displays RECALL icon in LCD.
3. Press UP or DOWN arrow keys to recall the stored group number, the default values from voltage or current setting mode
displayed in LCD.
4. Press ENTER button to conrm data recall, or press STORE button to exit data recall mode.
UP
RECALL 1 2 ENTER --------> OK.
3.8 USB Power Charging
Push the USB button, the default setting is voltage @ 5.2V and current @ 2.5A, the LCD will display 5.2V, with current value
as 0A. Connect the mobile phone via USB cable for power charging or to supply USB power to any compatible device.
For battery charging, the USB ports are suitable for mobile phines. With automatic check function, the supply will set the
proper charging current automatically.
1. Push the OUT button to activate output mode.
2. Push the USB button and USB indicator will turn off to exit USB charging mode.
USB OUT OK
4 Calibration
Following the image below, connect a 5 digit displayed volt meter and current meter, please resistance (10Ω/100W) into the
output terminals. To calibrate, start from point of zero voltage - voltage coefcient –and zero current – current coefcient.
Hold the SET button to switch on power supply until “REF” is displayed in LCD to enter calibration mode.
4.1 Voltage Calibration
The power supply displays 2.000A & 05.00V in setting area of LCD and **.**V displayed in main part of LCD. Connect the
output terminal with an external reference voltage meter and shift to CV mode. Hold the LEFT or RIGHT arrow keys to move
the cursors to left or right and push the UP or DOWN arrow keys to adjust the values same as readings of external reference
voltage meter, then click ENTER button to nish the voltage bias calibration.
The power supply displays 2.000A & 30.00V in setting area of LCD, hold the LEFT or RIGHT arrow keys to move the cursors
to left or right and push the UP or DOWN arrow keys to adjust the values same as readings of an external reference voltage
meter, then press ENTER button to nish the voltage gain calibration.

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User Manual
Important Notice : This data sheet and its contents (the “Information”) belong to the members of the Premier Farnell group of companies (the “Group”) or are licensed to it. No licence is granted
for the use of it other than for information purposes in connection with the products to which it relates. No licence of any intellectual property rights is granted. The Information is subject to change
without notice and replaces all data sheets previously supplied. The Information supplied is believed to be accurate but the Group assumes no responsibility for its accuracy or completeness, any
error in or omission from it or for any use made of it. Users of this data sheet should check for themselves the Information and the suitability of the products for their purpose and not make any
assumptions based on information included or omitted. Liability for loss or damage resulting from any reliance on the Information or use of it (including liability resulting from negligence or where the
Group was aware of the possibility of such loss or damage arising) is excluded. This will not operate to limit or restrict the Group’s liability for death or personal injury resulting from its negligence.
Tenma is the registered trademark of the Group. © Premier Farnell Limited 2016.
Part Number
72-2660
4.2 Current Calibration
Push the V/A button and power supply displays 0.500A & 30.00V in setting area of LCD and *.***A displayed in the main part
of LCD. Connect the output terminals with the external reference current meter and the load (5Ω/100W), shift to CC mode. Hold
the LEFT or RIGHT arrow keys to move the cursors to left or right and push the UP or DOWN arrow keys to adjust the values
same as readings of the external reference current meter. Then click the ENTER button to nish the current bias calibration.
While the power supply displays 2.750A & 30.00V in the setting area of LCD, hold the LEFT or RIGHT arrow keys to move the
cursors left or right and push the UP or DOWN arrow keys to adjust the values same as readings of external reference voltage
meter. Then click ENTER button to nish the current gain calibration.
Push OUT button to exit and restart the power supply to complete the calibration function.