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1.  INTRODUCTION

GP-4303A/D,  4185A/D  series  are  regulated  DC  POWER  SULLPY  units  with  voltmeter
and  amperemeter  :    GP-4303A/D  can  supply  the  DC  power  of  0  to  30V/3A
                                                    GP-4185A/D  can  supply  0  to  18V/5A.
                                                    (A  means  Analog  meter,  D  means  Digital  meter)

They  are  provided  with  continuously  variable  coarse  adjustment  and  the  output  voltages
and  with  continuously  variable  current  adjustment  in  a  range  of  10  to  100%.

Current  limiting  and  overload  protection  functions  are  built  in  to  protect  the  over  current.

The  supply  features  anloge  voltmeter  and  amperemeter,  enabling  the  user  to  monitor
the  supply's  operation  at  a  glance.

LEDs  for  Constant  current  (  C.C  )  and  Constant  Voltage  (  C.V  )  enables  monitoring  of  
operation  status.

Main  input  voltage  AC115  or  230V    selectable  and  50/60Hz  are  supported.

2.  FEATURE

  Built  in  output  current  limit  circuit  (Overload  Protection)

  Availability  of  series  and  /  or  parallel  operation

  Constant  Current  and  Constant  Voltage

  Low  Ripple  

  Remote  Control  Operation  (Analog  Control  Option)

  Built  in  Analog  Voltage  meter  and    Amperemeter

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Summary of Contents for GP-4185A

Page 1: ... POWER SUPPLY GP 4303D 3 00 A 30 0 V CURRENT FINE VOLTAGE POWER GND GND C V C C DC POWER SUPPLY GP 4303A R POWER CURRENT FINE VOLTAGE 99 Washington Street Melrose MA 02176 Fax 781 665 0780 TestEquipmentDepot com ...

Page 2: ...e 0 70 Storage Humidity less than 85 2 For quality improvement the exterior design and specifications of the product can be changed without notice 3 Should any further information be required please contact the EZ DIGITAL company or sales outlet WARRANTY Warranty service covers one year the date of original purchase In case of technical failure a year repair service will be provided by EZ DIGITAL ...

Page 3: ...nd overload protection functions are built in to protect the over current The supply features anloge voltmeter and amperemeter enabling the user to monitor the supply s operation at a glance LEDs for Constant current C C and Constant Voltage C V enables monitoring of operation status Main input voltage AC115 or 230V selectable and 50 60Hz are supported 2 FEATURE Built in output current limit circu...

Page 4: ...ch from Table 3 1 Select the arrow mark to the desired position and plug it in 3 Pull out the line fuse holder containing the fuse for overload protection Replace the fuse in the holder with the correct fuse from table3 1 plug it in AC 90 110 AC 108 132 AC 198 242 AC 207 250 For continued protection against fire replace the line fuse only with a fuse of the specified type and rating 3 2 INSTALLATI...

Page 5: ...on near the instrument 10 Do not place this instrument face down on the ground or damage to the knobs may resuit 11 Do not connect other power source to of the output terminal 12 Ground terminal of power code must connect to the ground 13 According to output porarity it solved problem ESD and Floating voltage using the connect ground port to terminal of output 14 To connect the ground be careful a...

Page 6: ... Short circuit Bar Manual Fuse Power source AC 115 230V 50 60Hz Dimension 131 W x 150 H x 273 D Weight Approx 4 5Kg Protection circuit Ambient temperature 5 40 Operating Humidity 50 80 Insulation between Compensation 1 1digit 2 5 F S Ampermete Accuracy Voltmeter Accuracy 1 1digit 2 5 F S Ripple Voltage Less than 2mVp p Line Regulation Load Regulation Less than 0 01 3mV for load variation of 0 to 1...

Page 7: ...VR The fine adjustment knob of the output voltage 8 COARSE VR The coarse adjustment knob of the output voltage 9 OUTPUT TERMINAL The negative side of output terminal 10 OUTPUT TERMINAL GND When the positive polarity or negative polarity is to be connected to the ground either an appropriate output terminal should be connected to the GND by a short circuit bar supplied as accessory When no bar conn...

Page 8: ... and set the current while watching the amperemeter indication At this time set the voltage adjustment knob 5 full counter clockwise and set the white mark of the FINE adjustment knob 4 at middle The minimum current that can be set is as follows GP 4303D A Approx 200mA 3A GP 4185D A Approx 350mA 5A After setting a limiting current remove the short circuit wire Then set the voltage to a required vo...

Page 9: ...peration between other types is not available 2 Notes on series operation When the series connected two units of regulated DC power supplies are overloaded the unit in which the overcurrent protection circuit activated first is applied with the reverse voltage from the output of the unit and so the series control element of the former will be damaged To protect this problem connect two diodes betw...

Page 10: ... knob 3 of the sub unit full clockwise b The voltage and current are variable by the main unit The output current limit can be selected within a range of about 10 to 100 of the double of the maximum rating current In this case as the load current increase the ampere meters of both main and sub units swing and the load current is indicated as the sum of both amperemeters NOTES Other type of regulat...

Page 11: ...ut limit current caan be set in a range from 10 to 100 of the rating current and when the output current reaches the set value the instrument operates in the constant current condition As the output current comes down below the set value the constant voltage condition is automatically resumed 9 TO REPLACE THE FUSE Pull out F1 below with screw driver and get rid of F1 take out spare Fuse in the hol...

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