Manual for Dual Output Bench Power Supply
Contents
1. Meter A 6 Voltage Control 7 Current Control 8 Voltage Control 9 Current Control 10 CV amp CC Indicator 11 CV amp CC Indicator 12 Output Indicator ON OFF the power input Indicated the CH1 output voltage Indicates the CH1 output current Indicates the CH2 output voltage Indicates the CH2 output current Adjust the output voltage of the CH1 supply and as the adjustment control for the maximum output voltage of the CH2 supply when either parallel or series tracking operation Adjust the output current of the CHI supply and as the adjustment control for the maximum output current of the CH2 supply when either parallel or series tracking operation Adjust the output voltage of the CH2 supply when in independent operation Adjust the output current of the CH2 supply The CV light green light is on when the CHI supply is in the constant voltage operation or when both the CHI and CH2 supplies are in the constant voltage operation in either series or parallel tracking mode The CC light red light is on when the CHI supply is in the constant current operation The CV light green light is on when the CH2 supply is in the constant voltage operation The CC light red light is on when the CH2 supply is in the constant current operation or in parallel tracking mode Switch the light on USER MANUAL 13 output terminal 14 output terminal 15 GND terminal2. 16 output terminal 17 output terminal 18 Output switches 19 TRACKING amp Mode Switch 20 Positive polarity output terminal for th CHI supply Negative polarity output terminal for the CHI supply Earth and chassis ground Positive polarity output terminal for the CH2 supply Negative polarity output terminal for the CH2 supply ON OFF the output Two push button switches that select Independent mode series tracking mode or parallel tracking mode as follows a When both switches are disengaged out the unit is in the Independent mode and the CH1 and CH2 power supplies are completely independent from each other b When the left switch is engaged in and the right switch is disengaged out the unit is in the Tracking series mode maximum voltage of both supplies is set using the VOLTAGE controls voltage at output terminals of the CH2 supply tracks the voltage at the output terminals of the CH1 SUPPLY Also in this mode of operation the positive terminal Red of the CH2 supply is connected to the negative terminal Black of the CHI supply to allow the two supplies to be used as a0 to double rating voltage supply When both switches are engaged in the unit is in the Tracking Parallel mode the CHI and CH2 supplies are wired together in parallel and both the maximum current and voltage are set using the CHI controls The CHI and CH2 output can be used as two individual but tracking powe
3. Black The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red If in doubt consult the instructions provided with the equipment or contact the supplier This cable appliance should be protected by a suitably rated and approved HBC mains fuse refer to the rating information on the equipment and or user instructions for details As a guide cable of 0 75mm should be protected by a 3Aor 5A fuse Larger conductors would normally require 13A types depending on the connection method used Any moulded mains connector that requires removal replacement must be destroyed by removal of any fuse amp fuse carrier and disposed of immediately as a plug with bared wires is hazardous if a engaged in live socket Any re wiring must be carried out in accordance with the information detailed on this label WET EEE ORE ee ee Be USER MANUAL 1 INTRODUCTION The regulated DC power supply series is designed to be used in applications such as powering operational amplifier push pull stages logic circuit and definition systems where plus and minus voltages are required to track with an insignificant error To represent an operation convenience 72 7245 is two independent power supplies housed in a single package 72 7245 consists of two identical independent adjustable DC power supplies A front panel switch selects one of three operation modes of independent series
4. LED display 3 digits panel meter x 2 0 5 Green LED display OUT ON 0 5 of rdg 2 digits 99 9V of full scale 9 99A of full scale Between chassis and output terminal 20M 0 or above DC 500V Between chassis and AC cord 30M Q or above DC 500V USER MANUAL 3 THEORY OF OPERATION The power supply consists of an AC input circuit and transformer a bias supply consisting of an rectifier filter pre regulator and reference voltage source a main regulator circuit consisting of the main rectifier and filter a series regulator a current comparator a voltage comparator a reference voltage amplifier and a relay control circuit The circuit element consists of integrated circuit U101 U102 U103 U104 U105 U108 The circuit arrangement is shown as block diagram in Fig 3 1 The circuitry is discussed with reference to the block diagram function description Single phase input power is applied to transformer through the input circuit Auxiliary rectifier D1021 1024 provides a bias voltage filtered by capacitor C103 C104 for the preregulator U101 U108 that provides a regulator voltage for elements of action The main rectifier a full wave bridge rectifier provides the power which is filtered by capacitor C1021 and then regulated via a series regulator and delivers to the output 1105 acts as a current limiter When current is over predetermined rating it is activated and decreases the current U102 provide
5. and parallel In the independent mode the output voltage and current of each supply are controlled separately and each supply is isolated up to 300V from output to chassis or output to output In the tracking mode both outputs are automatically connected in series or parallel and the controls of the left supply adjust the magnitudes of both the positive and negative output voltages Because the outputs are connected in a tracking configuration any internal disturbance in the master supply such as drift or ripple will cause an equal percentage change in the outputs of both the supplies Both power supplies are completely transistorized well regulated constant voltage constant current supplies that will provide full rated output voltage at the maximum output current or can be continuously adjusted throughout the output range The front panel current controls can be used to establish the output current limit overload or short circuit when the supply is used as a constant voltage source independent or tracking modes and the voltage controls can be used to establish the voltage limit ceiling when the supply is used as a constant current source independent mode only The supply will automatically cross over from constant voltage to constant current operation current limited operation in the tracking mode Each power supply CH1 CH2 has its own front panel meter that can measure output voltage or current One power supply may be used as
6. where the present current limit is reached At that point the output current becomes constant and the output voltage drops in proportion to further increases in load The point is indicated by the front panel LED indicators The crossover point is reached when the CV indicator goes off and the CC indicator comes on CONSTANT CURRENT vo mx RANGE 10 MAX CROSSOVER OUTPUT VOLTAGE OUTOUT CURRENT Fig 5 1 Constant Voltage Constant Current Characteristic Similarly crossover from the constant current to the constant voltage mode automatically occurs from a decrease in load A good example of this would be seen when charging a 12 volt battery Initially the open circuit voltage of the power supply may be preset for 13 8 volts A low battery will place a heavy load on the supply and it will operate in the constant current mode which may be adjusted for a 1 amp charging rate As the battery becomes charged and its voltage approaches 13 8 volts its load decreases to the point where it no longer demands the full 1 amp charging rate This is the USER MAN L crossover point where the power supply goes into the constant voltage mode 5 4 Operation Mode 1 Independent Operation The CH1 and CH2 supplies each provide a 0 to rating volts output at up to rating amps This procedure covers the use of the CH1 and CH2 supplies only when they are used independently from each other When used in the inde
7. 2 Line Voltage Conversion eee nene nn II 18 6 3 Adjustment 6 4 Cleaning 6 5 Service Repair and Calibr USER MANUAL SAFETY TERMS AND SYMBOLS Please take a moment to review these safety terms and symbols which may appear in this manual or on Equipment to prevent damage to the Function Generators ro gt WARNING Warning statements identify condition or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property DANGER High Voltage ATTENTION refer to Manual Protective Conductor Terminal ground Earth Terminal Frame or Chassis Terminal USER MANUAL FOR UNITED KINGDOM ONLY NOTE This lead appliance must only be wired by competent persons WARNING THIS APPLIANCE MUST BE EARTHED IMPORTANT The wires in this lead are coloured in accordance with the following code Green Yellow Earth Blue Neutral Brown Live Phase As the colours of the wires in main leads may not correspond with the colours marking identified in your plug appliance proceed as follows The wire which is coloured Green amp Yellow must be connected to the Earth terminal marked with the letter E or by the earth symbol or coloured Green or Green amp Yellow The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or
8. Because current through the two supplies must be equal when they are being used in series the lowest CURRENT control setting will set the maximum output current C Adjust the output voltage to the desired level by using the CHI VOLTAGE controls D Turn off the power supply and the equipment to be powered during hook up E If single supply operation is desired this allows the power supply to be used as twice the voltage and rating current simply by using the negative black terminal of the CH2 supply and the positive red terminal of the CHI supply the configuration as shown in Fig 5 3 LOAD Fig 5 3 Single Supply F If the chassis or common of the equipment being powered is separated from both the positive and negative polarity power inputs the output of the CH2 negative supply tracking the output of the CHI positive supply the configuration as shown in Fig 5 4 Power Supply Fig 5 4 Positive and Negative Supply 12 1242 MULLI UU LPUL POWER SUPPLY USER MANUAL 3 Parallel Tracking Operation In the parallel tracking mode of operation both supplies are strapped together in parallel This allows for a rating voltage supply with a double rating current capability Only the CHI output terminals are used for parallel tracking operation In the parallel tracking mode the CH2 supply output voltage and current track the CHI supply output voltage and current A Set the po
9. DC POWER SUPPLY 72 7245 MULTI OUTPUT User Manual 8272 72450M0 USER MANUAL mama Declaration of Conformity EMC EN 61326 1 Electrical equipment for measurement control and laboratory use EMC requirements 1997 A 1 1998 iducted and Radiated Emissions Electrostatic Discharge EN 61000 4 2 1995 1 1998 J5 A T 1998 A2 1998 A 14 2000 Radiated Immunity EN 61000 4 3 1996 Voltage Fluctuation EN 61000 Electrical Fast Transients EN 61000 4 4 1995 Surge Immunity EN 61000 4 5 1995 Conducted Susceptibility EN 61000 4 6 1996 Voltage Dips Interrupts EN 61000 4 11 1994 Safety Low Voltage Equipment Directive 73 23 EEC amp amended by 93 68 EEC EN 61010 1 2001 TEC 61010 1 2001 USER MANUAL SECTION PAGE 1 INTRODUCTION 1 2 SPECIFICATIONS 2 2 1 Genera 2 2 2 Operation Mode 2 2 3 Constant Voltage Operation eere H2 2 4 Constant Current Operation 3 2 5 Tracking Mode 3 2 6 Meter 3 2 7 Insulation 3 3 THEORY OF OPERATION 4 4 PANEL CONTROLS AND INDICATOR 6 4 1 Front Panel 8 4 2 Rear Panel 10 5 OPERATION INSTRUC 11 5 1 Precaution 11 5 2 Setting Cu 11 5 3 Constant Voltage Constant Current Characteristic 12 5 4 Operation Mode 6 MAINTENANC 18 6 1 Fuse Replacement 18 6
10. N Please refer to Fig 6 1 Adjustment Location B For other application and testing Safety or CE etc must set the wafer at OFF position 5 Output ON OFF Action The output ON OFF action is controlled with a single control the output switch is pushed on a high single output is on and output LED is on while the output switch is pushed off or tracking switch is pressed output will disable B CAUTION The output terminals are for use only with the A equipment which has no accessible live parts The output terminals should not be connected to any hazardous live parts 6 Fan Control 1 The fan of the power supply will not work upon power on until the temperature of the heat sink rises up to 3245 after adding load to output terminal The more the temperature of the heat sink rises the more the rolling speed of the fan gets fast The fastest rolling speed is when the temperature reaches to 70 C 2 To avoid damaging the power supply if the fan fails to work when the temperature reached to the appropriate value turn off the instrument and check the cause ER MANUAL 6 MAINTENANCE WARNING The following instructions are for use by qualified personnel only To avoid electrical shock do no perform any servicing other than the operation instruction of the manual unless you are qualified to do so 6 1 Fuse Replacement If the fuse blows the CV or CC indicators will not light and the power supply will no
11. a CHI supply controlling and CH2 may be used for furnishing various voltages or currents for a system When operated with the front panel mode switch in the tracking position the instrument is automatically internally connected in auto tracking configuration For audio production line the continuous or dynamic load can be internally selected When the connector 311141309 is connected to ON position the unit is suitable for audio power Amplifier application Normal setting to OFF position 72 7245 MULTI OUTPUT POWER SUPPLY USER MANUAL 2 SPECIFICATIONS 2 1 General Main Supply switch selectable Operation Environment Storage Temperature amp Humidity Accessories Table 2 100V 120V 220V 10 230V 10 6 50 60Hz Indoor use s Altitude up to 2000m Ambient temperature 0 C to 40 C Relative humidity 80 maximum Installation category II Pollution degree 2 10 C to 70 C 70 maximum Operation Manual x1 MODEL TRACKING REPLACED FUSE TYPE RATES INPUT TESTLEAD Independent Series Para 100v 120V 220V 230V WATTS VA GTL 104 GTL 105 0 0 60V 30V 727245 oma a 250v zo AMEN Has T Dimensions 255 W x145 H x265 D m m Weight kg 2 2 Operation Mode 1 Independent 2 Series 3 Parallel 2 3 Constant Voltage Operation 1 Output voltage range 2 Regulation 3 Reco
12. d at the left of the lower front panel circuit board VOLTAGE CURRENT CONTROL potentiometer board until the voltage read from the multimeter is the same as it was across the CHI output terminals Return the multimeter to the CH1 output terminals and verify that the output voltage is identical If not repeat this step 3 Parallel Tracking Adjustment A Disengage both Tracking mode switches both switches out so that the power supply is in the independent operating mode B Set the CHI supply VOLTAGE and CURRENT controls to minimum fully counterclockwise C Connect the multimeter across the CHI supply output terminals and measure the output current D Set the CHI supply VOLTAGE control to midrange and adjust the CURRENT control to obtain an current of rating amne read an USER MANUAL Engaged both Tracking mode switches both switches so that the power supply is in the parallel operating mode F Set the CH2 supply CURRENT control to maximum fully clockwise and set the VOLTAGE control to midrange Set output on by adjusting the trimmer potentiometer VR502 on circuit board located on the right side of the supply to obtain an output current of double rating amps on the multimeter 6 4 Cleaning A To clean the power supply use a soft cloth dampened in a solution of mild detergent and water Do not spray cleaner directly onto the instrument since it may leak into the cabinet and cause da
13. ds rating amps H Rotate the CH1 CH2 current control fully clockwise maximum Adjust VR103 on the VR303 CH2 supply circuit board located on the right side of the supply to obtain an output current of rating amps x1 05 read on the meter or LED display 2 Series Tracking Adjustment A Set the supply to Tracking series mode by engaging the left Tracking switch and releasing the right tracking switch B Set the CH2 CURRENT control to midrange and set the CHI supply voltage controls to minimum fully counterclockwise 72 7245 MULTI OUTPUT POWER SUPPLY USER MANUAL C Connect the multimeter to the CHI SUPPLY outputs and measure the voltage D Disconnect the multimeter from the CHI supply outputs and connect it across the CH2 supply outputs E Adjust trimmer potentiometer VR306 on the circuit board located on the right side of the supply to obtain the exact same reading for the CH2 Supply output as was preset at the CHI supply output e g if the minimum CHI supply output voltage is 10 00mV adjust VR306 to obtain an output voltage as close to 10 00mV at the CH2 supply as possible Set the CH2 CURRENT control to midrange and set the CHI supply voltage controls to maximum fully clockwise G Connect the multimeter to the CHlsupply outputs and measure the voltage H Disconnect the multimeter from the CHlsupply outputs and connect it across the CH2 supply outputs 1 Set output on by adjusting VR501 locate
14. it affecting adjustment accuracy or if you have a reason to believe the unit is out of adjustment The recommended calibration device is a multimeter with an accuracy of 0 1 DCV or better If readjustment is required use the following procedure The Tucson of the adjustments is shown in Fig 6 1 1 Independent Adjustment A Disengage both Tracking mode switches both switches out so that the power supply is in the independent operating mode B Connect a 4 1 2 digital multimeter with an accuracy of 40 196 DCV to measure the DC voltage at the output terminals of the CHI CH2 supply C Set the CHI CH2 VOLTAGE control to maximum fully clockwise D Adjust trimmer potentiometer VR101 CH1 VR301 CH2 on the circuit board located on the right side of the supply for a reading as close to rating voltage x1 05 on the multimeter as possible E Set output on by adjusting the trimmer potentiometer VR801 CH2 VR201 CHI from the CHI CH2 voltage indicator circuit board located on the meter or A D converter board for a reading of rate voltage x1 05 on the CH1 CH2 F Connect the external multimeter across the CH1 CH2 SUPPLY output terminals to read the output current so that the meter causes a short circuit across the terminals and adjust the CH1 CH2 CURRENT control so that rating amps is read on the multimeter Set output on by adjusting the trimmer potentiometer VR901 CH2 VR701 CHI so that the CH1 CH2 meter also rea
15. mage Do not use chemicals containing benzine benzene toluene xylene acetone or similar solvents Do not use abrasive cleaners on any portion of the instrument 6 5 Service Repair and Calibration For Service Repair and calibration please contact your local Tenma distributor or go to http www tenma com uoneao yuaunsnfpy 1 9 Croce IVINVW YASNA
16. ock hazard to the user Be careful when connecting power supplies in series to achieve voltages higher than 60V DC total or 60V DC between any connection and earth ground Note Simultane ly metering of both current and voltage can be obtained in the mode of operation setting one of the displays for current metering and one for voltage metering In this case the output voltage across the two supplies is actually double the displayed value For example if the CHI display is set for voltage metering and the CH2 display for current metering the output voltage across the CHI positive red terminal and the CH2 negative black terminal would be double the reading on the CHI LED Display since both supplies are putting out the same voltage The actual output current would be the value read from the CH2 LED Display since the two supplies are wired in series current flowing through each supply must be equal B Set the CH2 CURRENT control to the full clockwise position The maximum current is set by using the CURREN control Follow the instructions for Setting current Limit select CH1 or CH2 supply independently by using the CHI CURRENT control Note Because the supplies are being used in series either CURRENT control can be used to set maximum current If desired the CH1 CURRENT control can be rotated fully clockwise and the CH2 CURRENT control can be used to USER MANUAL adjust the maximum current value
17. pendent operating mode the operation controls of the two power supplies are completely independent and either supply can be used individually or both can be used simultaneously A Disengage both Tracking mode switches both switches out so that the power supply is in the independent operating mode B Adjust Voltage control and Current control to the desired output voltage and current P C Turn off the power supply and the equipment to be powered during hook up D Connect the positive polarity of the device being powered to the red 4 terminal of the power supply E Connect the negative polarity of the device being powered to the black terminal of the power supply F Fig 5 2 illustrates the connection procedure Fig 5 2 Independent Operation JSER MANUAL 2 Series Tracking Operation When the series tracking mode of operation is selected the position Red terminal of the CH2 supply output is internally connected to the negative black terminal of the CHI supply In the series tracking mode the maximum output voltage of both CHI and CH2 supplies can be simultaneously varied with one control The maximum CH2 supply voltage is automatically set to the same as the CHI supply by using the CHI VOLTAGE controls Set the power supplies to the Tracking series mode by engaging the left Tracking switch and release the right Tracking switch WARNING Voltage more than 60V DC has a lethal sh
18. r supplies or just the CHI output can be used as a 0 to rating voltage supply with a 0 to double rating current capability te 1279 MULIDUUIEUI EUWER OUIELE USER MANUAL 4 2 Rear Panel 21 Fuse holder 22 Power socket 23 AC selects switch 24 HI LO switch 25 Cooling Fan Selects to permit operation from 100 120 220 or 230VAC 50 60Hz line voltage by using 24 HI LO switch HI position selects high voltage range 120 230V AC inputs LO position selects low voltage range 100 220V AC inputs Ventilates the hot air out to prevent output stage from thermo shock and improves the temperature coefficient MULILVUIEUIEUWERDUIELI USER MANUAL 5 OPERATION INSTRUCTION 2 5 1 Precaution 1 AC input AC input should be within the range of line voltage 10 230V 10 6 50 60Hz x WANING To avoid electrical shock the power cord protective grounding conductor must be connected to ground AVERTISS Pour viter les chocs lectriques le fil de terre du cordon secteur doit imp rativement tre reli la terre 2 Installation Avoid using the supply in a place where ambient temperature exceeds 40 C The heat sink located at the rear of the supply must have sufficient air space for radiation CAUTION To avoid damaging the power supply don t use it in a place where ambient temperature exceeds 40 C 3 Output voltage overshoot Voltage between output terminals never e
19. s a reference voltage for 0103 U105 U103 is a inverter amplifier U104 is a comparator amplifier which compares reference voltage and feedback voltage and then delivers to Q103 Q104 which then calibrates the output voltage Q113 is activated when the unit is overload It controls Q103 current magnitude which limits the output current The relay control circuit provides limited power dissipation in series USER MANUAL Y XE 3 lt So 5 679 ae c cePm S25 S22 2373 31 5555 2g mR as 885 2 8 g 8 8 Fan Sc 55 3 283 UP S ER 758 8 Sm 2 Ry 23 zoo wR ost2o on E 555 pom Ep 5 0 m 3 B 5 g gt ET 2g li rA Ghz 582 248560 2 m 53955 MN 555 2 lt Sen 237 S Figure 3 1 Block Diagram ee 72 7245 MULTI OUTPUT POWER SUPPLY USER MANUAL USER MANUAL 4 PANEL CONTROLS AND INDICATORS o o 9X5 1 18 4 0 3 7 40 2 6 gt senno ovis UAR CORREA 5 a me A x imm E 2 imi E sve TRACKING CRE ow A Fig 4 2 Rear Panel USER MANUAL 1 1 Front Panel Power switch a 2 Meter V 3 Meter A 4 Meter V
20. t operate The fuse should not normally open unless a problem has developed in the unit Try to determine and correct the cause of the blown fuse then replace only with a fuse of the correct rating and type The fuse is located on the rear panel see Fig 4 2 amp Table 2 1 WARNING For continued fire protection replace fuse only N with 250V fuse of the specified type and rating and disconnect power cord before replacing fuse AVERTISS Pour une protection contre les risques d incendie T remplacer le fusible exclusivement par un modele aux caract ristiques quivalentes 6 2 Line Voltage Conversion The primary winding of the power transformer is tapped to permit operation from 100 120 220 or 230V AC 50 60Hz line voltage Conversion from one line voltage to another is done by change AC selects switch as shown in Fig 42 The rear panel identifies the line voltage to which the unit was factory set To convert to a different line voltage perform the following procedure 1 Make sure the power cord is unplugged 2 Change the AC selects switch to the desired line voltage position 3 A change in line voltage may also require a corresponding change of fuse value Install the correct fuse value as listed on rear panel 72 1243 MULII OUIFUI POWER SUPPLY USER MANUAL 6 3 Adjustments This unit was accurately adjusted at the factory before shipment Readjustment is recommended only if repairs have been made in a circu
21. very time 4 Ripple amp Noise 5 Temperature coefficient 2 4 Constant Current Operation 1 Output current range 2 Regulation 3 Ripple current Two independent outputs and Output from 0 to rating volts and 0 to rating amperes Output from 0 to rating volts at rating amperes each Output from 0 to double rating volts at rating amperes Output from 0 to double rating amperes at rating volts 0 to rating voltage continuously adjustable Line regulation 0 01 3mV Load regulation S0 01 3mV rating current Load regulation lt 0 02 5mV rating current gt 3A 15 100 50 load change minimum load 0 5A ImVrms 5Hz 1MHBz 300ppm C 0 to rating current continuously adjustable Line regulation 0 2 3mA Load regulation 0 2 3mA Z3mArms 72 7245 MULTI OUTPUT POWER SUPPLY USER MANUAL 2 5 Tracing Operation 1 Parallel Operation 2 Series Operation 2 6 2 7 Regulation Regulation Line regulation lt 0 01 3mV Load regulation lt 0 019 3mV rating current 3A 0 02 5mV rating current gt 3A Line regulation lt 0 01 5mV Load regulation lt 300mV A Positive and Negative supply Fig 5 4 CH2 tracking error S0 5 10mV of t CHI No load with load add load regulation 5 300mV B Single supply Fig 5 3 Meter A Display A Display V B Accuracy C Voltmeter D Ammeter Insulation 3 digits panel meterx2 0 5 Red
22. wer supplies to the Tracking Parallel mode by engaging both Tracking switches B Output voltage will now be read from the CHI VOLTAGE display Output current is exactly double the value read from the CHI CURRENT display because each supply is providing the same amount of current C Because both voltage and current of the CH2 supply track the CH1 supply the maximum current and voltage are set by using the CHI controls Using the CHI supply output jacks follow the instructions for Setting Current Limit 5 2 Section Remember that the actual current output at the CHI supply output jack is double the reading on the CH2 indicator meter D Adjust the output voltage to the desired level by using the CHI VOLTAGE controls E Turn off the power supply and the equipment to be powered during hook up F Connect the positive polarity of the device being powered to the red terminal of the CHI power supply G Connect the negative polarity of the device being powered to the black terminal of the CHI power supply The configuration is shown as Fig 5 5 Power Supply Fig 5 5 Parallel Tracking Operation USER MANUAL 4 Dynamic Load Operation amp Application A When select to dynamic load position Ihe max peak current is at 1 7 times rating current The features are only applied for audio circuit of amplifier and audio production lines Change the position of wafer Ji 11 of CHI and J309 of CH2 from OFF to O
23. xceeds the preset value when the power is turned on or off 5 2 Setting Current Limit 1 Determine the maximum safe current for the device to be powered 2 Temporarily short the and terminals of the power supply together with a test lead 3 Rotate the VOLTAGE control away from zero sufficiently for the CC indicator to light 4 Set the meter selection switch to A position to select the current metering mode 5 Adjust the CURRENT control for the desired current limit Read the current value on the Ammeter 6 The current limit overload protection has now been preset Do not change the CURRENT control setting after this step 7 Remove the short between the and terminals and hook up for constant voltage operation USER MANUAL 5 3 Constant Voltage Constant Current Characteristics The working characteristic of these series Power Supplies is called a constant voltage constant current automatic crossover type This permits continuous transition from constant current to constant voltage modes in response to the load change The intersection of constant voltage and constant current modes is called the crossover point Fig 5 1 shows the relationship between this crossover point and the load For example if the load is such that the power supply is operating in the constant voltage mode a regulated output voltage is provided The output voltage remains constant as the load increases up until the point
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