INSTRUCTION
MANUAL
Model 1665/1666/1667
BENCH SWITCHING DC
POWER SUPPLIES
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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TABLE OF CONTENTS
1. SAFETY INSTRUCTIONS AND PRECAUTIONS ..................................................... 3
2. INTRODUCTION .......................................................................................................... 4
3. SPECIFICATIONS ........................................................................................................ 5
4. CONTROLS AND INDICATORS ................................................................................ 6
5. OPERATION PROCEDURES ...................................................................................... 9
1. SAFETY INSTRUCTIONS
WARNING
Model 1667 has maximum output voltage up to 60Vdc. It may be hazardous to touch metal part of the
output terminals. User must avoid touching live metal part of the output terminals.
1. Do not use this apparatus near water.
2. Clean only with dry cloth.
3. Do not block any ventilation openings.
4. Do not install unit near any heat source or heating emitting devices.
5. Prevent the power cord from being walked on or pinched.
6. Unplug this unit during lighting storms or when unused for long periods of time.
PRECAUTIONS
1. The unit must be used within its specified range.
2. The rated input voltages can be found on the rating label at the back the unit.
3. Before plugging into the AC supply, check with the rating label.
4. Refer all servicing to manufacturer.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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2. INTRODUCTION
Model 1665 only: V meter max. display
Above 19.99 output voltage, V meter display
These Laboratory Grade Switching DC Power Supplies were built with coarse and fine output voltage and current
limiting controls.
Current limiting control with automatic crossover of constant voltage (CV) and constant current (CC) indicators make this
series ideal for research and development work in laboratories.
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3. SPECIFICATIONS
Specifications 1665 1666 1667
Output Voltage: 1-19.99VDC 1-40VDC 1-60VDC
Output Voltage Control: Fine & Coarse Fine & Coarse Fine & Coarse
Output Current: 0-10A 0-5A 0-3.3A
Ripple & Noise (P-P): 20mV 20mV 20mV
Load Regulation: 0.5% + 200mV 0.5%+200mV 0.5% +200mV
Line Regulation: 50mV 50mV 50mV
Input Voltage: 100 - 240 VAC, 50Hz / 60Hz
Meter Type: Digital LED
Voltmeter Range: 10 mV 100 mV 100 mV
Ammeter Range: 10 mA 10 mA 10 mA
Voltmeter Accuracy: 1% + 2 counts
Ammeter Accuracy: 0.5% + 2 counts
Indicators: CC & CV
Cooling System: Thermostatic control fan
Protection Devices: Approvals: CE
Dimension (WxHxD): 8" x 4.5" x 11" (205 x 115 x 275 mm )
Weight: 6.6lbs (3 Kg)
NOTE: Specifications and information are subject to change without notice.
4. CONTROLS AND INDICATORS
FRONT PANEL
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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REAR PANEL
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Front Panel
1. Power Switch -- Turns the power supply ON/OFF.
2. DC Voltmeter (LED Display)* -- Indicated the present output voltage with auto range.
3. DC Ammeter (LED display) -- Indicates the present output current with auto range.
4. Constant Current Mode (C.C.) -- Indicator Indicates the power supply is operating in constant current mode.
5. Constant Voltage Mode (C.V.) -- Indicator Indicates the power supply is operating in voltage mode.
6.
Current Fine Adjust --
7. Current Coarse Adjust -- Coarse adjust knob for current limiting point and current value in constant current mode.
8. Voltage Fine Adjust -- Fine adjust knob for the output voltage in voltage mode.
9. Voltage Coarse Adjust -- Coarse adjust knob for the output voltage in voltage mode.
10. Output Terminal Positive ( + ) -- Terminal for tapping of positive (-}-) output.
11. Output Terminal Negative (-) -- Terminal for tapping of negative (-) output.
12. GND Terminal -- Chassis ground terminal. Normally, this is connected to either the + or - terminal depending on the
application.
Fine adjust knob for current limiting point and current value in constant current mode.
Rear Panel
13. Fan -- Allow at least 80 mm space from wall.
14. Input Socket with fuse.
5. OPERATING PROCDURES
Output Voltage Control - It is a dual control consisting of a coarse and fine potentiometer. The final DC voltage output is the sum of both
adjustments.
Current Limiter Control - It is a dual control (coarse/fine) that changes the DC current over the rated current range.
Ground Connections - For operating with negative or positive output terminal, grounded or without grounding. Connections (+ or -) are made by
using the shorting plate at the terminal.
REMARKS: When operating this supply without being grounded, high impedance leakage can exist between the power supply
circuitry and the chassis ground.
Basic Mode of Operation - This power supply is designed to operate as a constant voltage source or as a constant current source. Automatic
crossover to either mode of operation occurs when load conditions change as follows:
Constant Voltage - The power supply will function as a constant voltage source as long as the load current is less than the current limiting
value set by the current limit operation. When the load current is equal to or greater than the current limit set, the power supply will automatically
crossover and operate as a constant source.
Constant Voltage Automatic Crossover - The power supply will function as a constant source when the load voltage does not equal to the
voltage value set by the output voltage control. When the load voltage equals to the value set by the output voltage control the power supply will
automatically cross over and operate as a constant voltage source.
Presetting Current Limiting Value - There are occasions when you will not want your load to draw too much current or want to prevent
any damage, you can preset the current limiting value as follows : Short circuit the output terminals and adjust the current limit control to your
desired value.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
10
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
Printed in China PN# 481-441-9-001
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