NF HVA4321 Instruction Manual

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HVA4321

10kV AC/DC AMPLIFIER

HVA4321

INSTRUCTION MANUAL

NF Corporation

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10kV AC/DC AMPLIFIER

HVA4321

Instruction Manual

DA00012063-001

This unit generates high voltage. Incorrect operation may result in death

or injury. To prevent death or injury, please read this manual carefully.

Keep this manual near the unit so that operators may read at any time.

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HVA4321

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⎯ Preface ⎯

Thank you for purchasing the 10 kV AC/DC amplifier.

To ensure safe and proper use of this electric equipment, please read first INSTRUCTIONS FOR SAFE

USE on the following pages.

 Caution Symbols Used in This Manual

The following caution symbols are used in this manual. Be sure to observe these caution symbols and their contents to ensure the safety of the user and avoid damage to the equipment.

This mark indicates information for the avoidance of a hazard such as electric shock that may endanger

human life or cause injury during handling of the equipment.

This mark indicates information for the avoidance of damage to the equipment during handling.

 This manual has the following chapter organization.

If reading this manual for the first time, start from Chapter 1.

1. OVERVIEW

Describes various items that must be checked prior to using this product.

2. PREPARATIONS BEFORE USE

Describes various cautions regarding preparations to be made before installation or operation.

3. PART NAMES AND FUNCTIONS

Describes functions, movements and basic operations for knobs on the panel. Read this manual while operating the unit.

4. OPERATION

Describes operation of this product.

5. REPRESENTATIVE CHARACTERISTICS

Describes representative characteristic of this product.

6. TROUBLESHOOTING

Describes corrective actions when problems occur.

7. MAINTENANCE

Describes basic operation tests and daily maintenance procedures.

8. SPECIFICATIONS

Lists the specifications (functions and performance).

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CAUTION

WARNING

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HVA4321

⎯ Safety Precautions ⎯

To ensure safe use, be sure to observe the following warnings and cautions. NF Corporation shall not be held liable for damages that arise from a failure to observe these warnings and cautions. This product is a Class 1 product (with protective conductor terminal) that conforms to the JIS and IEC insulation standards.

 Be sure to observe the contents of this instruction manual.

This instruction manual contains information for the safe operation and use of this product. Be sure to read this information first before using this product. All the warnings in the instruction manual must be heeded to prevent hazards that may cause major accidents.

 Be sure to ground the product.

This product uses a line filter and must be grounded to avoid the risk of electric shock. To prevent electric shock, be sure to safely implement grounding according to Japanese Standard for Electrical Equipment Technology D (Type 3) or higher. When the 3-pin power plug is connected to the 3-pin power outlet with protective ground contact, this product is automatically grounded. To use 3-pin 2-pin conversion adapter, be sure to connect the ground line (green) of the conversion adapter to the ground terminal near the outlet. If the ground terminal is available at the back panel, the terminal may be grounded with a wire equivalent to or larger than the thickness of the power cable.

 Check the power supply voltage.

This product operates on the power supply voltage indicated in Grounding and Power Supply Connection in this instruction manual. Prior to connecting the power supply, check that the voltage of the power supply matches the rated power supply of the product.

 Observe the fuse rating.

Fire may occur. Use the rated fuse specified in Grounding and Power Supply Connection in the instruction manual. When the fuse is replaced, be sure to disconnect the power cable from the outlet.

 In case of suspected anomaly

If this product emits smoke, an abnormal smell, or abnormal noise, immediately disconnect the power cable and stop operation. If such an anomaly occurs, do not use this product until it has been repaired, and immediately report the problem to the location of purchase (either NF Corporation or your distributor).

 Do not use this product when gas is present.

Otherwise, it may cause an explosion.

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 Do not remove the cover.

This product contains high-voltage parts. Absolutely never remove its cover. Even when the inside of this product needs to be inspected, do not touch the inside. All such inspections are to be performed by service technicians designated by NF Corporation.

 Do not modify this product.

Absolutely never modify this product, as this may cause new hazards and may disqualify this product from repair in case of failure.

 Safety-related symbols

The general definitions of the safety-related symbols used on this product and in the instruction manual are provided below.

Instruction manual reference symbol

This symbol is displayed to alert the user to potential danger and refer him/her to the instruction manual.

Electric shock danger symbol

This symbol indicates locations that present a risk of electric shock under specific conditions.

Protective terminal grounding symbol

This symbol indicates terminals that require grounding to prevent electric shock. Before operation of the unit, be sure to connect this terminal to the ground of type 3 or higher. (When the 3-pin power cable is connected to the 3-pin outlet, it is not necessary to connect this ground terminal.)

Warning Symbol

This symbol indicates information for avoiding danger to human life or bodily injury such as electric shock while handling this product.

Caution Symbol

This symbol indicates information for preventing damage to the product when handling it.

 Other symbols

This symbol indicates the "ON" position of the power switch.

This symbol indicates the "OFF" position of the power switch.

This symbol indicates that the external conductor of the connector is connected to the

case.

This symbol indicates that the external conductor of the connector is connected to the

signal ground.

CAUTION

WARNING

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Contents

Page

1. Overview

1.1 Features................................................................................................................. 1-1

1.2 Function description and block diagram ............................................................ 1-3

1.2.1 Function description .................................................................................................... 1-3

1.2.2 Block diagram ............................................................................................................... 1-4

Preparations before use

2.1 Before using the HVA4321.................................................................................... 2-1

2.2 Installation............................................................................................................. 2-2

2.3 Grounding and power supply connection........................................................... 2-3

3. Nomenclature and functions

3.1 Signal system........................................................................................................ 3-1

3.1.1 Internal DC bias signal source..................................................................................... 3-1

3.1.2 External bias signal input ............................................................................................ 3-1

3.1.3 External signal input .................................................................................................... 3-2

3.1.4 Input signal ON/OFF ..................................................................................................... 3-2

3.2 Amplifier ................................................................................................................ 3-4

3.2.1 Amplifier operation mode ............................................................................................ 3-4

3.2.2 Amplifier control........................................................................................................... 3-6

3.2.3 Output ........................................................................................................................... 3-9

3.3 Monitor and control signal system .................................................................... 3-11

3.3.1 Monitor .........................................................................................................................3-11

3.3.2 Control signal system ................................................................................................ 3-12

3.4 Power supply items ............................................................................................ 3-17

3.5 Panel drawing ..................................................................................................... 3-18

3.5.1 Front panel.................................................................................................................. 3-18

3.5.2 Rear panel................................................................................................................... 3-19

4. Operation method

4.1 Operation example in constant voltage mode ....................................................4-1

4.1.1 Panel setting ................................................................................................................. 4-3

4.1.2 Connection of signal source and connection of load................................................. 4-6

4.1.3 Power supply and internal high voltage DC power supply......................................... 4-9

4.1.4 Signal output and adjustment.....................................................................................4-11

4.1.5 Signal OFF .................................................................................................................. 4-13

4.2 Operation example in constant current mode (total) ....................................... 4-14

4.2.1 Panel setting ............................................................................................................... 4-16

4.2.2 Connection of signal source and connection of load............................................... 4-19

4.2.3 Power supply and internal high voltage DC power supply....................................... 4-22

4.2.4 Signal output and adjustment.................................................................................... 4-24

4.2.5 Signal OFF .................................................................................................................. 4-26

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4.3 Operation example in constant current mode (load)........................................ 4-27

4.3.1 Panel setting ............................................................................................................... 4-29

4.3.2 Connection of signal source and connection of load............................................... 4-32

4.3.3 Power supply and internal high voltage DC power supply....................................... 4-35

4.3.4 Signal output and adjustment.................................................................................... 4-37

4.3.5 Signal OFF .................................................................................................................. 4-39

4.4 Operation example in constant current + constant voltage mode .................. 4-40

4.4.1 Panel setting ............................................................................................................... 4-42

4.4.2 Connection of signal source and connection of load............................................... 4-45

4.4.3 Power supply and internal high voltage DC power supply....................................... 4-48

4.4.4 Signal output and adjustment.................................................................................... 4-50

4.4.5 Signal OFF .................................................................................................................. 4-52

4.5 Change of load and power OFF ......................................................................... 4-53

4.5.1 Change of load ........................................................................................................... 4-53

4.5.2 Power supply OFF ...................................................................................................... 4-56

4.6 Remote control.................................................................................................... 4-57

4.6.1 Remote control ........................................................................................................... 4-57

4.6.2 Panel setting for use of remote control..................................................................... 4-58

5. Representative characteristics

5.1 Measuring method ................................................................................................ 5-1

5.2 Characteristics in constant voltage mode .......................................................... 5-3

5.2.1 Frequency characteristics ........................................................................................... 5-3

5.2.2 Step response............................................................................................................... 5-4

5.3 Characteristics in constant current mode .......................................................... 5-5

5.3.1 Frequency characteristics ........................................................................................... 5-5

5.3.2 Step response............................................................................................................... 5-6

5.4 Characteristics in constant current and constant voltage mode ...................... 5-7

5.4.1 Frequency characteristics ........................................................................................... 5-7

5.5 Characteristics of voltage monitor and current monitor ................................... 5-8

5.5.1 Frequency characteristics ........................................................................................... 5-8

5.6 Others .................................................................................................................... 5-9

5.6.1 Delay of output signal for input signal........................................................................ 5-9

5.6.2 Step response due to difference of amplitude .......................................................... 5-10

6. Troubleshooting

6.1 When suspecting a fault....................................................................................... 6-1

7. Maintenance

7.1 Daily maintenance ................................................................................................ 7-1

7.2 Inspection .............................................................................................................. 7-2

7.3 When the unit is not used for a long time........................................................... 7-2

7.4 Performance test................................................................................................... 7-3

7.4.1 Test of constant voltage mode..................................................................................... 7-3

7.4.2 Test of constant current mode..................................................................................... 7-4

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8. Specification

8.1 Signal area ............................................................................................................ 8-1

8.2 Amplifier ................................................................................................................ 8-2

8.2.1 Characteristics of constant voltage mode .................................................................. 8-2

8.2.2 Characteristics of constant current mode................................................................... 8-4

8.3 Output area............................................................................................................ 8-5

8.4 Monitor output ...................................................................................................... 8-5

8.5 Other input/output signal ..................................................................................... 8-6

8.6 Protection circuit .................................................................................................. 8-7

8.7 Others .................................................................................................................... 8-7

8.8 General items ........................................................................................................ 8-8

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Figures

Page

Figure1-1. HVA4321 Block diagram................................................................................................. 1-4

Figure2-1. Check of power OFF ...................................................................................................... 2-3

Figure2-2. Check of internal high voltage DC power OFF ............................................................. 2-3

Figure2-3. Inserting power cable connector................................................................................... 2-4

Figure2-4. Using conversion connector .........................................................................................2-4

Figure2-5. Casing ground terminal ................................................................................................. 2-5

Figure3-1. Internal DC bias signal source ...................................................................................... 3-4

Figure3-2. External DC bias input ................................................................................................... 3-1

Figure3-3. External signal input ...................................................................................................... 3-2

Figure3-4. Signal ON/OFF switch .................................................................................................... 3-2

Figure3-5. Operation mode switch .................................................................................................. 3-4

Figure3-6. Limiter and response..................................................................................................... 3-6

Figure3-7. Operation of voltage limiter (1) ..................................................................................... 3-6

Figure3-8. Operation of voltage limiter (2) ..................................................................................... 3-6

Figure3-9. Operation of current limiter ........................................................................................... 3-7

Figure3-10. Response function in constant voltage mode .............................................................. 3-8

Figure3-11. Response function in constant current mode .............................................................. 3-8

Figure3-12. Output area..................................................................................................................... 3-9

Figure3-13. Power supply and internal high voltage DC power ...................................................... 3-9

Figure3-14. Return terminal ............................................................................................................ 3-10

Figure3-15. Monitor output...............................................................................................................3-11

Figure3-16. Status signal output ......................................................................................................3-11

Figure3-17. Remote/local settings .................................................................................................. 3-12

Figure3-18. Remote control input ................................................................................................... 3-12

Figure3-19. Remote control input circuit........................................................................................ 3-13

Figure3-20. Remote control of HIGH VOLTAGE POWER SUPPLY ON/OFF ................................... 3-14

Figure3-21. Remote control of signal system ON/OFF .................................................................. 3-14

Figure3-22. Remote control of signal ON/OFF ............................................................................... 3-15

Figure3-23. Example of status contact output ............................................................................... 3-16

Figure4-1. Constant voltage mode (total mode) ............................................................................. 4-1

Figure4-2. Constant voltage mode (load mode) ............................................................................. 4-2

Figure4-3. Internal high voltage DC power OFF ............................................................................. 4-3

Figure4-4. Switch settings............................................................................................................... 4-3

Figure4-5. Output mode settings .................................................................................................... 4-4

Figure4-6. Local settings................................................................................................................. 4-4

Figure4-7. Limiter settings .............................................................................................................. 4-5

Figure4-8. Current monitor mode settings ..................................................................................... 4-5

Figure4-9. Response settings ......................................................................................................... 4-6

Figure4-10. Connection of external signal source signal ................................................................ 4-6

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Figures

HVA4321

Figure4-11. Connection of monitor ................................................................................................... 4-7

Figure4-12. Connection of output cable ........................................................................................... 4-7

Figure4-13. Power supply.................................................................................................................. 4-9

Figure4-14. Internal high voltage DC power ON............................................................................. 4-10

Figure4-15. Using internal DC bias signal .......................................................................................4-11

Figure4-16. Using external oscillator.............................................................................................. 4-12

Figure4-17. Using external DC bias signal ..................................................................................... 4-12

Figure4-18. Total mode .................................................................................................................... 4-15

Figure4-19. Internal high voltage DC power OFF ........................................................................... 4-16

Figure4-20. Switch settings............................................................................................................. 4-16

Figure4-21. Output mode settings .................................................................................................. 4-17

Figure4-22. Local settings............................................................................................................... 4-17

Figure4-23. Limiter settings ............................................................................................................ 4-18

Figure4-24. Current monitor mode settings ................................................................................... 4-18

Figure4-25. Response settings ....................................................................................................... 4-19

Figure4-26. Connection of external signal source signal .............................................................. 4-19

Figure4-27. Connection of monitor ................................................................................................. 4-20

Figure4-28. Connection of output cable ......................................................................................... 4-20

Figure4-29. Power supply................................................................................................................ 4-22

Figure4-30. Internal high voltage DC power ON............................................................................. 4-23

Figure4-31. Using internal DC bias signal ...................................................................................... 4-24

Figure4-32. Using external oscillator.............................................................................................. 4-25

Figure4-33. Using external DC bias signal ..................................................................................... 4-25

Figure4-34. Load mode.................................................................................................................... 4-28

Figure4-35. Internal high voltage DC power OFF ........................................................................... 4-29

Figure4-36. Switch settings............................................................................................................. 4-29

Figure4-37. Output mode settings .................................................................................................. 4-30

Figure4-38. Local settings............................................................................................................... 4-30

Figure4-39. Limiter settings ............................................................................................................ 4-31

Figure4-40. Current monitor mode settings ................................................................................... 4-31

Figure4-41. Response settings ................................................................................................

....... 4-32

Figure4-42. Connection of external signal source signal .............................................................. 4-32

Figure4-43. Connection of monitor ................................................................................................. 4-33

Figure4-44. Connection of output cable ......................................................................................... 4-33

Figure4-45. Power supply................................................................................................................ 4-35

Figure4-46. Internal high voltage DC power ON............................................................................. 4-36

Figure4-47. Using internal DC bias signal ...................................................................................... 4-37

Figure4-48. Using external oscillator.............................................................................................. 4-38

Figure4-49. Using external DC bias signal ..................................................................................... 4-38

Figure4-50. Constant current constant voltage mode (total mode)............................................... 4-41

Figure4-51. Constant current constant voltage mode (load mode) ............................................... 4-41

Figure4-52. Internal high voltage DC power OFF ........................................................................... 4-42

Figure4-53. Switch settings............................................................................................................. 4-42

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Figures

HVA4321

Figure4-54. Output mode settings .................................................................................................. 4-43

Figure4-55. Local settings............................................................................................................... 4-43

Figure4-56. Limiter settings ............................................................................................................ 4-44

Figure4-57. Current monitor mode settings ................................................................................... 4-44

Figure4-58. Response settings ....................................................................................................... 4-45

Figure4-59. Connection of external signal source signal .............................................................. 4-45

Figure4-60. Connection of monitor ................................................................................................. 4-46

Figure4-61. Connection of output cable ......................................................................................... 4-47

Figure4-62. Power supply................................................................................................................ 4-48

Figure4-63. Internal high voltage DC power ON............................................................................. 4-49

Figure4-64. Using internal DC bias signal ...................................................................................... 4-50

Figure4-65. Using external oscillator.............................................................................................. 4-51

Figure4-66. Using external DC bias signal ..................................................................................... 4-51

Figure4-67. Input signal OFF........................................................................................................... 4-53

Figure4-68. Internal high voltage power supply OFF ..................................................................... 4-53

Figure4-69. Checking items before power OFF .............................................................................. 4-54

Figure4-70. POWER OFF ................................................................................................................. 4-54

Figure4-71. Removing high voltage cable ...................................................................................... 4-55

Figure4-72. Remote control............................................................................................................. 4-57

Figure4-73. Remote control switch................................................................................................. 4-58

Figure5-1. Compensation of probe ................................................................................................. 5-1

Figure5-2. Measuring method of output voltage ............................................................................ 5-1

Figure5-3. Measuring method of output current ............................................................................ 5-2

Figure5-4. Frequency characteristics in constant voltage mode without load ............................. 5-3

Figure5-5. Frequency characteristics in constant voltage mode with capacity load ................... 5-3

Figure5-6. Step response in constant voltage mode without load ................................................ 5-4

Figure5-7. Step response in constant voltage mode with 35 pF load ........................................... 5-4

Figure5-8. Frequency characteristics in constant current (TOTAL) mode.................................... 5-5

Figure5-9. Frequency characteristics in constant current (LOAD) mode ..................................... 5-5

Figure5-10. Step response in constant current mode with 1 MΩload ............................................. 5-6

Figure5-11. Frequency characteristics in constant current (TOTAL) + constant voltage mode .... 5-7

Figure5-12. Frequency characteristics in constant current (LOAD) + constant voltage mode ...... 5-7

Figure5-13. Frequency characteristics of voltage monitor.............................................................. 5-8

Figure5-14. Frequency characteristics of current monitor .............................................................. 5-8

Figure5-15. Delay of input/output signal .......................................................................................... 5-9

Figure5-16. Step response in constant voltage mode.................................................................... 5-10

Figure7-1. How to remove fan cover ............................................................................................... 7-1

Figure7-2. Check method of constant voltage mode ..................................................................... 7-3

Figure7-3. Check method of constant current mode...................................................................... 7-4

Figure8-1. Output current................................................................................................................ 8-2

Figure8-2. Voltage and current range allowed for output .............................................................. 8-3

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HVA4321

Tables

Page

Table2-1. Accessories.................................................................................................................... 2-3

Table3-1. Logic of HIGH VOLTAGE POWER SUPPLY ON/OFF ...................................................... 3-3

Table3-2. Logic of signal system ON/OFF signal ......................................................................... 3-3

Table3-3. Logic of SIGNAL ON/OFF signal.................................................................................... 3-3

Table3-4. Status contact output signal ......................................................................................... 3-3

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Figures

HVA4321

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1. Overview

1.1 Features

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1-1

1.2 Function description and block diagram

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1-3

1.2.1 Function description

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1-3

1.2.2 Block diagram

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1-4

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HVA4321

1-2

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1.1 Features

HVA4321

1-1

1.1 Features

The HVA4321 10 kV AC/DC amplifier is a constant voltage/constant current amplifier capable of ±10 kVpk and ±10 mApk.

Since the unit has a DC bias signal source, it can be used as a DC power supply that is individually

capable of high voltage output. Since external AC signal and DC signal input are allowed, it can

also be used as an amplifier capable of high voltage output.

 Constant voltage/constant current amplifier

The unit can be used as a constant voltage amplifier or a constant current amplifier.

The unit can also be set as a constant voltage amplifier for DC signal and a constant

current amplifier for AC signal.

 Built-in DC signal source

The unit has a built-in DC bias signal source.

 With external signal input terminals

The unit can be connected to the external signal source for two systems.

 Excellent characteristics with large amplitude

In constant voltage mode, 10 kVpk output up to 7 kHz is available.

In constant current mode, 10 kVpk output up to 4 kHz is available.

(with resistance load for both modes)

 With output limiter function

Output voltage limiter and output current limiter functions are available.

 High slew rate

In the constant voltage amplifier, the slew rate of 500 V/Ω is achieved.

 Two types of current mode

In the constant current amplifier, two types of modes are available; the total mode that gives the

set current output from the amplifier and the load mode that gives correct current set to the load

by compensating the current leaking from stray capacitance of a wire along the path.

 Step response waveform adjusting function

For a step signal, fine adjustment of the response waveform can be made.

 Correct monitor output

Output voltage and output current can be correctly monitored. (Voltage monitor gain: 1/1000, Current monitor gain: 1 V/10 mA)

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1.1 Features

HVA4321

1-2

 Visual display of high voltage output

During high voltage output, the LED around the output connector lights and the revolution

changes depending on the output voltage level.

 Remote control is capable.

Signals can be turned ON/OFF with an external control signal.

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1.2 Function description and block diagram

HVA4321

1-3

1.2 Function description and block diagram

1.2.1 Function description

Major functions of this unit are classified into the following:

・Signal system ・Amplifier stage ・Detection system ・High voltage power supply ・External control system

 Signal system

The following three types of signals can be used as the signal sources:

・Signal source built into the unit that gives the DC output (DC BIAS) ・Signal from external oscillator (OSC INPUT) ・Signal from external DC signal source (EXT DC BIAS INPUT)

These signals can be used simultaneously. Signal is internally added and the input is given to the

amplifier stage.

 Amplifier stage

Input signals are separated into positive and negative signals, and each signal is transmitted to

the high voltage amplifier stage through an optical fiber.

 Detection system

Output voltage and output current are correctly detected by independently detecting and

combining DC and AC components.

 High voltage power supply

The unit is using ±12 kV power supply to obtain the output of 10 kVpk. This power supply can

be individually turned ON/OFF for safety.

 External control system

The signal source can be turned ON/OFF with an external contact signal or TTL level signal.

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1.2 Function description and block diagram

HVA4321

1-4

Fig. 1-1

HVA4321 Block diagram

Driver

Protection

circui

Driver

High voltage amplifier

Current sensor

Optical fiber

DC detection

circuit

Driver

Voltage

detection

circuit

External

control

circuit

Control signal for

remote control

Power

supply

Power

supply

Power

supply

Power

supply

Line

filter

Control power

supply

FAN

High voltage

power supply

control circuit

Power

supply

Display

circuit

LED indicator

ON/OFF

control circuit

1.2.2 Block diagram

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2. Preparations before use

2.1 Before using the HVA4321

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2-1

2.2 Installation

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2-2

2.3 Grounding and power supply connection

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2-3

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2.1 Before using the HVA4321

HVA4321

2-1

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2.1 Before using the HVA4321

 Safety check

Before using the HVA4321, read the following items in the instruction manual:

 [INSTRUCTIONS FOR SAFE USE] (Described at the beginning of this instruction manual.)  [2.3 Grounding and connection of power supply]

 Appearance and accessories check

 Removal of product

Remove the product out of the box. If unusual statues (damage or dent) are observed

on the cardboard box, make sure that the product is not adversely affected.

 Check of appearance

Make sure that there is no damage or dent on the panel surface, knob or connector.

 Check of accessories

Accessories of this product are as shown below. Make sure that the quantity is

sufficient or that there is no faulty part.

Table2-1. Accessories

・Instruction manual (HVA4321 instruction manual) ・Power cable (10A, 125V, 2 m, 3 poles) ・Fuse (time lag, 10 A/250V,φ2 x 20 mm) ・High voltage cable A600B80 (approx. 2 m by ALDEN) ・Ground cable (0.75 mm2 with M6 crimp terminal, approx. 4 m, black) ・Ground cable (0.75 mm2 with M6 crimp terminal, approx. 4 m, white)

If appearance of the product shows unusual damage or if accessories are insufficient,

This product contains high-voltage parts. Absolutely never remove its cover.

Otherwise, touching the internal circuit may result in death by electric shock.

WARNING

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2.2 Installation

HVA4321

2-2

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2.2 Installation

 Before installation

This product has a positive air conditioning system with back intake and side exhaust

fans to cool the inner parts. To allow ventilation of air, install this product with

the side and the back by 30 cm or more apart from walls.

The range of ambient temperature and humidity for this product is as follows:

Performance assurance :Temperature 5℃to 35℃ Humidity 45% to 85% (no condensation) Operation assurance : Temperature 0℃to 40℃ Humidity 10% to 85% (no condensation) Storage condition : Temperature -10℃to 50℃ Humidity 10% to 80% (no condensation)

 Installation environment

Do not install or use the product in the following environments:

 Place where there is much corrosive gas, moisture, dirt, dust or conductive particles.

Failure such corrosion or deteriorated insulation may occur.

 Place where there is flammable gas.

Explosion may occur.

 Place where an object may fall

Failure may occur.

 Outdoor or place where the product is exposed to direct sunlight, or place near fire or heat

Performance may not be satisfied or failure may occur.

 Place near electromagnetic field source, high voltage device, power line, radio transmitter, cell

phone, etc.

Unintended high voltage output may be given or noise may enter.

 Place where frequent vibration occurs.

Malfunction or failure may occur.

 Installation

 Make sure that four legs at the bottom are on a flat place such as a desk.  Never place the unit vertically with the back facing down, horizontally with the side facing down or

up side down with the top facing down.

 Do not put an object on the unit.

Do not use a radio transmitter or a cell phone around this unit. Unintended high

voltage output may be given due to radio.

WARNING

Page 27

2.3 Grounding and power supply connection

HVA4321

2-3

2.3 Grounding and power supply connection

The power supply requirements for this product are as follows:

 Power supply voltage range: Single phase AC100V ±10%  Frequency range: 50/60 Hz±2 Hz

 Power consumption: 800VA or less

a) Check items before connection of the power cable

Make sure that the power switch on the front panel is OFF.

Figure2-1. Check of power OFF

Make sure that the HIGH VOLTAGE POWER SUPPLY switch on the front panel is pressed.

Figure2-2. Check of internal high voltage DC power OFF

POWER

DC BIAS

0-10

オフであることを確認

Make sure that this is OFF.

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

PULL ON

OFF

押し込まれている状態

This must be pressed.

Page 28

2.3 Grounding and power supply connection

HVA4321

2-4

b) Connection of power cable

Insert the connector of the power cable accompanying the unit into the inlet of the back panel.

Figure2-3. Inserting power cable connector

c) Inserting the power outlet

This unit operates with the power of AC100V±10%. Insert the power cable plug into the power outlet

with the protective ground. Use the accompanying power cable and insert it into the power outlet with the

ground. The casing of the unit is then grounded.

 Using 3-pin 2-pin adapter

When 3-pin 2-pin conversion adapter is sued, be sure to connect the ground wire of the conversion

adapter to the ground terminal near the outlet.

Figure2-4. Using conversion connector

～

LI NE

100V

50Hz／60Hz 800 VA MAX

コネクタを差し込む

Insert the connector.

Ground

3-pin 2-pin adapter

Page 29

2.3 Grounding and power supply connection

HVA4321

2-5

！

 If the ground pole is not available in the adjacent area

If the power cable cannot be grounded because the ground pole is not available at

the power outlet, be sure to ground the casing ground terminal at the back with a

wire of 2 mm

or more.

Figure2-5. Casing ground terminal

Be sure to ground this unit for safety. Otherwise, a serious accident such as electric shock may occur.

The standard power cable accompanied has rated voltage of AC125V and rated current of 10A. When a power cable not accompanied is used, be careful for the rated voltage and current.

When a fuse is replaced, be sure to disconnect the power cable from the outlet. Replace it with the same

standard one. For this product, the time lag type fuse with the rating of 10A/250V and φ2 x 20 mm is used.

！

CAUTION

WARNING

筐体接地端子

Casing ground terminal

Page 30

2.3 Grounding and power supply connection

HVA4321

2-6

Page 31

3. Nomenclature and functions

3.1 Signal system

････････････････････････････････････

3-1

3.1.1 Internal DC bias signal source

･･････････････････

3-1

3.1.2 External bias signal input

･･････････････････････

3-1

3.1.3 External signal input

･･･････････････････････････

3-2

3.1.4 Input signal ON/OFF

･･････････････････････････

3-2

3.2 Amplifier

･････････････････････････････････････････

3-4

3.2.1 Amplifier operation mode

･･････････････････････

3-4

3.2.2 Amplifier control

･･････････････････････････････

3-6

3.2.3 Output

･･･････････････････････････････････････

3-9

3.3 Monitor and control signal system

･･････････････････

3-11

3.3.1 Monitor

･････････････････････････････････････

3-11

3.3.2 Control signal system

･･･････････････････････

3-12

3.4 Power supply items

･････････････････････････････

3-17

3.5 Panel drawing

･･････････････････････････････････

3-18

3.5.1 Front panel

･････････････････････････････････

3-18

3.5.2 Rear panel

･････････････････････････････････

3-19

Page 32

Page 33

3.1 Signal system

HVA4321

3-1

DC BIAS

0-10

OFF

Rotary lock knob

Figure3-1.

Internal DC bias signal source

3.1 Signal system

3.1.1 Internal DC bias signal source

 DC BIAS

This sets the output level of the internal DC bias signal

source.

With combination of the pin switch, settings are

available in the range of:

・In constant voltage mode

0 to ±10 kV

・In current mode

0 to ±10 mA

・In constant current and constant voltage mode

0 to ±10 kV

To prevent inadvertent rotation of the dial, use the rotation lock function of the dial.

When the rotary lock knob is pressed clockwise, the dial is locked.

 ＋／－

Polarity of the internal DC bias signal source is set. With "+", the output is positive and with "-", the

output is negative.

 ON/OFF

It is the ON/OFF switch for the internal DC bias signal source. When it is ON, the internal DC bias

signal is effective.

3.1.2 External bias signal input

 EXT DC BIAS INPUT

It is the BNC connector to give external input of the DC bias signal.

・Rated input voltage ±10 Vpk ・Input impedance 10kΩ±10%

AC signal input can also be given. But the input is only for DC. Frequency

characteristic and slew rate are inferior to the OSC input.

 ON/OFF

Valid or invalid external DC bias signal is set.

When it is ON, the external DC bias signal input is valid.

Figure3-2.

External DC bias input

OFF

EXT DC BIAS

INPUT

10V MAX

Zi n 1 0 k

Page 34

3.1 Signal system

HVA4321

3-2

3.1.3 External signal input

 OSC INPUT

It is the BNC connector to give amplified input on this unit with an external

oscillator.

・Rated input voltage ±10 Vpk ・Input impedance 10 kΩ±10%

 GAIN

The signal gain given to OSC INPUT can be fine adjusted in the range of approx. ±3%.

It is turned with a flat tip screwdriver.

 NORMAL/INVERT

The signal polarity in OSC INPUT is set.

In NORMAL, the input signal polarity is the same as the output

signal polarity.

In INVERT, the input signal polarity is reverse to the output

signal polarity.

Figure3-3. External signal input

 ON/OFF

Valid or invalid signal in OSC INPUT is set. When it is ON, the signal in OSC INPUT is valid.

The input voltage range to OSC INPUT and EXT DC BIAS INPUT terminals is ±10V.

3.1.4 Input signal ON/OFF

 SIGNAL ON/OFF

Input to the amplifier area for INT DC BIAS, EXT

DC BIAS and OSC INPUT is switched ON/OFF.

When it is ON, each input signal is given to the high

voltage amplifier.

Figure3-4. Signal ON/OFF switch

！

CAUTION

OFF

INVERT

NORMAL

GAIN

OSC

INPUT

10V MAX

Zi n 1 0 k

SI G N A L

OFF

Page 35

3.1 Signal system

HVA4321

3-3

！

This signal ON/OFF switch has the function to set whether or not the input signal is transmitted to the high

voltage amplifier. It does not switch ON/OFF the connection between the high voltage amplifying output

and the output terminal of this unit.

The output from the high voltage amplifier is always connected tot the output terminal.

 When the following operations are made in SIGNAL ON, SIGNAL OFF occurs forcibly.

・When operation mode CV/CC of the amplifier is changed ・When remote/local settings are changed

 In SIGNAL OFF, the OFF LED lights. For the following cases, the OFF LED blinks:

・The HIGH VOLTAGE POWER SUPPLY switch is OFF.

(When the internal high voltage DC power supply is OFF)

 When the following operations are made in SIGNAL ON, SIGNAL OFF occurs forcibly and the

LED changes from lighting to blinking.

An error during OFF turns the OFF LED from lighting to blinking.

・The fan revolution stopped. ・Temperature in the casing became high. ・Voltage of the internal control power supply became low. ・When the LIMIT/TRIP is set to TRIP, the current limiter circuit was activated.

In the cases above, SIGNAL ON cannot be recovered unless the cause is removed.

WARNING

Page 36

3.2 Amplifier

HVA4321

3-4

3.2 Amplifier

3.2.1 Amplifier operation mode

 CV/CC

It is the switch to set the operation mode of the unit.

CV: Constant voltage mode

CC: Constant current mode

The gain of the high voltage amplifier is:

・Constant voltage mode: 1000V/1V ・Constant current mode: 1 mA/1V

 DC BIAS CV/CC

It is the switch to set the DC signal operation mode in constant current mode.

CV: The DC signal is constant voltage mode. The AC signal is constant current mode.

CC: Both the DC signal and the AC signal are constant current mode.

For example, if a capacity load is connected in constant current mode, the capacity load has infinite

impedance for DC. DC cannot be applied in constant current.

To apply DC to a capacity load, set this switch to CV so that DC output may be given in constant

voltage mode. Then, constant DC bias can be applied to the capacity load.

In constant voltage mode, this function is invalid for either setting.

Figure3-5. Operation mode switch

OVERLOAD

1kV/1V

1mA/1V

DC BIAS

Page 37

3.2 Amplifier

HVA4321

3-5

The frequency at the boundary of constant voltage mode and constant current mode may vary

depending on the load type and value.

 For resistance load

・For 250 kΩ Approx. 5 mHz or more ・For 1 MΩ Approx. 0.2 Hz or more

 For capacity load

・For 16 pF Approx. 100 Hz or more ・For 100 pF Approx. 50 Hz or more ・For 1000 pF Approx. 5 Hz or more

 OVERLOAD

It is the LED that lights if the unit amplifier has a fault. It lights if the unit is overloaded or the limiter

is activated.

Page 38

3.2 Amplifier

HVA4321

3-6

3.2.2 Amplifier control

Figure3-6. Limiter and response

 VOLTAGE (kV)

The limit value of the output voltage can be set in the range from ±5 kV to ±10 kV at the resolution

of 1 kV. For example, when the limit values of +8 kV for positive side and -6 kV for negative side are

satisfactory, make settings to +8 kV and -6 kV. Set the value with a flat tip screwdriver.

When MAX is set, the limit is invalid. The amplifier can give the maximum voltage output available.

 In constant voltage mode

In constant voltage mode, the voltage of the internal high voltage DC power supply is limited and the

amplitude of the input signal is limited to limit the output voltage.

Use the unit paying attention to the following:

・The limit voltage for setting is only a guideline. There is approx. 0 to 100V error for the set value. ・If the output voltage is not proportional to the input voltage due to load, the value may be larger by

about 1 kV than the set value.

Figure3-7. Operation of voltage limiter (1)

Figure3-8. Operation of voltage limiter (2)

TRIP

VOLTAGE(k V)

-5

-10

MAX

LI MIT

DC CURRENT( mA)

RESPONSE

CV CC

LI MITER

+8k V

で制限される。

-6kV

で制限される。

Limited to +8 kV

Limited to -6 kV

リミッタレベル

入力電圧

出力電圧

リミッタレベルを越える。

Exceeding limiter level

Limiter level

Input voltage

Output voltage

Page 39

3.2 Amplifier

HVA4321

3-7

 In constant current mode

In constant current mode, the voltage of the internal high voltage DC power supply is limited to limit

the output voltage. Use the unit paying attention to the following: ・Since the limit is made by current voltage, there is approx. 0 to 1 kV error for the set value.

 DC CURRENT (mA)

The output current limit value is set. The limit value is common for both positive and negative and the

average current can be set in the rage from 0 mA to 10 mA.

For example, the value is set to 3 mA, the limit is +3 mA or -3 mA for DC. For AC, the average current

for positive side is 3 mA and the average current for negative side is -3 mA.

Figure3-9. Operation of current limiter

Use this current limiter paying attention to the following:

・The limit current set here is only a guideline. The setting accuracy is not high. ・It is limited not by peak current, but by average current. ・The voltage waveform of a load capacity may be non-linear due to limitation by average current,

resulting in increase of peak current.

 LIMIT/TRIP

In LIMIT, the output current is limited with the setting value.

In TRIP, if the output current exceeds the set value, SIGNAL is switched OFF and the output is 0V.

平均電流

±3 mA

で制限される。

本来の出力電流レベル

直流のとき

平均電流

±3 mA

で制限される。

交流のとき

Limited by average current of ±3 m

For AC

Original output current level

For DC

Page 40

3.2 Amplifier

HVA4321

3-8

 RESPONSE CV

In constant voltage mode, the step response waveform such as square wave is adjusted. As the dial is

turned toward the right, the response approaches the peak. Make adjustment for the desired response

waveform.

Figure3-10. Response function in constant voltage mode

 RESPONSE CC

In constant current mode, the step response waveform such as square wave is adjusted.

As the dial is turned toward the right, the response approaches the peak. Make adjustment for the

desired response waveform.

Figure3-11. Response function in constant current mode

The step response using RESPONSE may not be sufficiently adjusted depending on setting conditions or load conditions. In a case, oscillation may occur.

！

CAUTION

Response rightmost

Response leftmost

Response rightmost

Page 41

3.2 Amplifier

HVA4321

3-9

！

3.2.3 Output

 HIGH VOLTAGE POWER SUPPLY ON/OFF

Turn ON/OFF the internal high voltage DC power supply.

Press the switch until it "clicks". It is then locked and the

internal high voltage DC power supplies is OFF.

To turn it ON, turn the knob to the right. It is unlocked and the

internal high voltage DC power supply is ON.

Figure3-12. Output area

When wiring for load or output is changed, be sure to turn OFF (push) this switch. Make sure that the OFF

lamp at the left of the switch lights before work.

Do not touch load or the output cable with the internal high voltage DC power supply ON. Otherwise,

electric shock may occur.

When the power is supplied, the internal high voltage DC power supply is always OFF regardless of

ON/OFF status of this switch. If this switch is ON, turn it OFF once and turn it ON again.

Figure3-13. Power supply and internal high voltage DC power

WARNING

！

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

DANGER

OUTPUT Hi

PULL ON

危険防止のため、出力中は出力ケーブルに絶対に触れないでください。

10kV MAX

10mA MAX

Be sure to press the above switch to turn OFF the H

power for safety when the output wi ring is changed.

Never touch the output cable during output for safety.

Power switch

HIGH VOLTAGE POWER SUPPLY switch

Internal high voltage power supply

Not ON

ON now

ON again

Page 42

3.2 Amplifier

HVA4321

3-10

 ON/OFF

Indicates the output status of the internal high voltage DC power supply. When the high voltage DC

power supply gives high voltage output, the ON LED lights.

 OUTPUT HI

It is the high voltage output terminal of the unit. Connect the accompanying special cable for use.

 Output display warning lamp

When high voltage output is given, the LED around OUTPUT HI rotates and lights. The color is

yellow up to about 4.9 kV and red over this value. The rotation speed varies depending on the output

voltage level. The higher the voltage is, the faster the rotation speed is.

 OUTPUT Lo TOTAL CURRENT

It is the return terminal of the high voltage output used in constant voltage mode or constant current

total mode.

 OUTPUT Lo LOAD CURRENT

It is the return terminal of the high voltage output used in constant current load mode.

 CURRENT SELECT

Total/load mode is set. When the unit is used in total mode, set it to TOTAL. When it is used in load

mode, set it to LOAD.

For details, refer to "4.2 Operation example in constant current mode (total)" and "4.3 Operation

example in constant current mode (load)".

Figure3-14. Return terminal

1mA/1V

DC BIAS

CURRENT

SELECT

LOAD

TOTAL

MONITOR

1V/ 1kV

Zout 50

VOLTAGE

CURRENT

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT Lo

1V/ 10mA

Zout 50

Page 43

3.3 Monitor and control signal system

HVA4321

3-11

3.3 Monitor and control signal system

3.3.1 Monitor

 MONITOR VOLTAGE

It is the BNC connector for the monitor signal of output voltage.

・Gain: 1V/1kV ・Output impedance: 50Ω±10%

 MONITOR CURRENT

It is the BNC connector for the monitor signal of output current. In constant current mode, current

selected by TOTAL/LOAD is monitored.

・Gain: 1V/10 mA ・Output impedance: 50Ω±10%

Figure3-15. Monitor output

 SIGNAL ON/OFF STSTUS

It is the total level signal output that indicates SIGNAL ON/OFF status. When the signal is ON, the

level is low (approx. 0.1V or less). When the signal is OFF, the level is high (approx. 4.5V or more).

1/ Signal switch

Figure3-16. Status signal output

SIGNAL ON/OFFSTATUS

OUTPUT

MONITOR

VOLTAGE

CURRENT

TTL( Lo: ON) Zout 10k

1V/1kV

Zout 50

1V/10mA

Zout 5 0

SI G N AL

スイッチ

SI GN AL ON/OFF

STATUS

ONOF F

LOWHIGH

HIGH

OF F

SIGNAL SWITCH

SIGNAL ON/OFF

Page 44

3.3 Monitor and control signal system

HVA4321

3-12

3.3.2 Control signal system

 ON/OFF CONTROL

It is the remote/local setting switch. In LOCAL, the unit can be turned ON/OFF with the panel switch.

In REMOTE, the unit can be turned ON/OFF with an external signal. In REMOTE, the operation of

HIGH VOLTAGE POWER SUPPLY ON/OFF can be made with the panel.

HIGH VOLTAGE POWER SUPPLY ON/OFF Internal DC high voltage ON/OFF

SIGNAL ON/OFF High voltage amplifier input ON/OFF

OSC INPUT ON/OFF External oscillator signal ON/OFF

INT DC BIAS ON/OFF Internal DC bias signal ON/OFF

EXT DC BIAS ON/OFF External DC bias signal ON/OFF

Figure3-17. Remote/local settings

Change REMOTE/LOCAL when the signal is OFF. If REMOTE/LOCAL is changed with the signal

ON, the signal is forcibly turned OFF.

 REMOTE CONTROL INPUT

It is the BNC connector to give ON/OFF control signal input when ON/OFF CONTROL is set to

REMOTE.

Figure3-18. Remote control input

INT DCBIAS ON/OFFSI GNAL ON/OFF

OSC I NP UT O N/OFF EXTDC BIASON/OFF

HIGHVOLTAGE

POWER SUPPL Y ON/OFF

TTL(Lo: ON)TTL(Lo: ON)

TTL(Lo: ON)TTL(Lo:ON)

TTL(Hi:OFF)

REMOTE CONTROL I NPUT

ON/OFF

CONTROL

REMOTE

LOCAL

Page 45

3.3 Monitor and control signal system

HVA4321

3-13

The delay time from input of the SIGNAL ON/OFF signal to actual ON/OFF is approximately 5 ㎲ or less. The delay time from input of other ON/OFF signals to actual ON/OFF is approximately 15 ㎲ or less.

The input circuit of the remote control terminal is as follows:

Figure3-19. Remote control input circuit

 HIGH VOLTAGE POWER SUPPLY ON/OFF

HIGH VOLTAGE POWER SUPPLY ON/OFF controls ON/OFF of the internal DC high voltage

power supply.

When the HIGH VOLTAGE POWER SUPPLY ON/OFF switch on the front panel is ON and the

HIGH VOLTAGE POWER SUPPLY ON/OFF signal on the back panel is ON, the internal high

voltage DC power supply is ON.

Table3-1. Logic of HIGH VOLTAGE POWER SUPPLY ON/OFF

HIGH VOLTAGE POWER SUPPLY ON/OFF signal in remote control operation

Front panel switch OFF ON

TTL

High

(Approx. 5 V)

Low

(Approx. 0V)

High

(Approx. 5 V)

Low

(Approx. 0 V)

Back panel control

signal

Contact Open Close Open Close

Status of internal high voltage

DC power supply

OFF ON

For HIGH VOLTAGE POWER SUPPLY ON/OFF, the control with external signal is always effective

regardless of "REMOTE" or "LOCAL" settings on the front panel switch.

Therefore, when external control is not used, be sure to short-circuit the control input terminal at the

back with an accompanying shorting plug.

If shorting is not performed, the internal high voltage DC power supply is not ON although HIGH

VOLTAGE POWER SUPPLY ON/OFF switch on the panel is "ON".

+5 V +5 V

0. 0047µF

470

10k

74 HC14

470

Page 46

3.3 Monitor and control signal system

HVA4321

3-14

Figure3-20. Remote control of HIGH VOLTAGE POWER SUPPLY ON/OFF

 ON/OFF of signal system

Each signal of INT DC BIAS ON/OFF, EXT DC BIAS ON/OFF and OSC INPUT ON/OFF can be

individually controlled for ON/OFF. To give a signal output from the output terminal, both the desired

signal ON/OFF and SIGNAL ON/OFF must be ON.

Figure3-21. Remote control of signal system ON/OFF

Table3-2. Logic of signal system ON/OFF signal

ON/OFF signal of signal system in remote control operation

TTL High(Approx. 5V) Low(Approx. 0V)

Back panel control

signal

Contact Open Close

Signal status OFF ON

OFF

Lo wHigh Low High

オフ状態オン状態オフ状態

High

ロックされている状態

ロックが解除されている状態

正面パネル

HI G H VOLT A GE

ON/OFF

スイッチ

背面パネル

ON/OFF

信号

内部高電圧

POWER SUPPLY

HI G H VOLT A GE POWER SUPPLY

直流電源の状態

Front panel HIGH VOLTAGE POWER SUPPLY ON/OFF switch

Back panel HIGH VOLTAGE POWER SUPPLY ON/OFF signal

Internal high voltage DC power

supply

status

Locked status Unlocked status

OFF status

ON status

OFF status

オフ状態

オン状態

正面パネル

RE MOTE／LOCAL

スイッチ

背面パネル

SI GNAL ON/OFF

信号

LOCAL REMOTE

ONOF F

OF F

非出力

出力

信号の出力

各信号の

ON/OFF

信号

OFF

Front panel REMOTE/LOCAL switch

ON/OFF signal of each signal

Back panel SIGNAL ON/OFF signal

No output

Output

Signal output

OFF

Page 47

3.3 Monitor and control signal system

HVA4321

3-15

 SIGNAL ON/OFF

SIGNAL ON/OFF controls a batch ON/OFF operation for input signals with external signal.

When SIGNAL is ON and ON becomes OFF for some reason, turn the control signal OFF once and

turn it ON again. Otherwise, SIGNAL is not ON.

Figure3-22. Remote control of signal ON/OFF

Table3-3. Logic of SIGNAL ON/OFF signal

SIGNAL ON/OFF signal in remote control operation

TTL High(Positive logic) Low(Positive logic)

Back panel control

signal

Contact Open Close

Signal status OFF ON

オフ状態

オン状態

オフ状態

正面パネル

RE MOTE／LOCAL

スイッチ

背面パネル

SI GNAL ON/OFF

信号

出力の状態

LOCAL REMOTE

ONOFF

OF F

オン状態

ONOFF

(1)

過電流などで出力がオフすると、

(2)

出力オン指令中でも

一度オフにしないと再度オンしない。

Front panel REMOTE/LOCAL switch

Back panel SIGNAL ON/OFF signal

Output status

OFF status

ON status

OFF status

ON status ON status

(2) It must be turned OFF once and ON again

when the output ON command is given

(1)

When the output is OFF due to over-current

Page 48

3.3 Monitor and control signal system

HVA4321

3-16

 SIGNAL ON/OFF STATUS

It is the terminal to give contact signal output linked to SIGNAL ON/OFF status.

Table3-4. Status contact output signal

Terminal signal Signal name Explanation

－－－－－－

Terminal for fixing. Do not use it.

2 Not connected Not connected to any line. It can used as a relay

terminal.

3 COM Common terminal for contact output.

4 NC When SIGNAL is OFF, it is connected to the COM

terminal.

5 NO When SIGNAL is ON, it is connected to the COM

terminal.

－－－－－－

Terminal for fixing. Do not use it.

Figure3-23. Example of status contact output

SIGNALON/OFF STATUS

AC 250V 3A MAX DC 30V 3A MAX

２３４５

番端子は中継端子として使用可能

SI GNAL ON

に点灯する表示灯など

AC1000 V

へ

No. 2 terminal can be used as a relay terminal.

Indicators that light for SIGNAL ON

(

Activated with AC100V

)

To AC100V

Page 49

3.4 Power supply items

HVA4321

3-17

！

3.4 Power supply items

 POWER

It is the power switch of the unit.

 LINE

It is connected to single phase AC100V.

Be sure to connect it to the outlet with ground with an accompanying 3 pin power cable.



It is terminal for grounding of casing. If grounding is not available with a power cable, ground this

terminal with a wire of 2 mm

or more.

Be sure to ground this unit for safety. Otherwise, a serious accident such as electric shock may occur.

 FUSE

Use a 10A/250V fuse with time lag.

When a fuse is replaced, be sure to disconnect the power cable from the outlet. Replace it with the same

standard one. For this product, the time lag type fuse with the rating of 10A/250V and φ2 x 20 mm is used.

WARNING

Page 50

Page 51

3.5 Nomenclature

HVA4321

3-18

3.5 Nomenclature

3.5.1 Front panel

Page number of detailed explanation is shown after

●

ON/OFF

外部発振器からの信号を使用するときオンにします。

（３．１．３）

TRIP

POWER

DC BIAS

0-10

OFF

SIGNAL

OFF

VOLTAGE(kV)

-5

-10

MAX

LI MIT

DC CURRENT(mA)

RESPONSE

CV CC

HIGHVOLTAGE

POWER SUPPL Y

PUSHOFF

OFF

OVERLOAD

1kV/1V

1mA/1V

DC BIAS

CURRENT

SELECT

LOAD

TOTAL

ON/OFF

CONTROL

REMOTE

LOCAL

OFF

INVERT

NORMAL

GAIN

OSC

INPUT

10V MAX

Zi n 1 0k

EXT DC BIAS

OUTPUT

TTL(Lo:ON) Zout 10k

SIGNAL ON/ OFF STAT US

OUTPUT

MONITOR

1V/1kV

Zout 5 0

VOLTAGE

CURRENT

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT Lo

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

DAN GE R

OUTPUT Hi

PULL ON

危険防止のため、出力中は出力ケーブルに絶対に触れないでください。

10kV MAX

10mA MAX

10V MAX

Zin 10k

1V/10mA Zout 5 0

LI MITER

！

●

ON/OFF

内部直流バイアス信号を使用するときオンにします。

（３．１．１）

●

SIGNAL ON/OFF

増幅部に入力される信号のオン・オフスイッチです。

（３．１．４）

●

ON/OFF CONTROL

SIGNAL ON/OFF や各信号のON/OFFを

LOCAL パネル操作 REMOTE 外部信号操作

に切り替えるスイッチです。

（３．３．２）

●

SI G NA L O N/ OFF STAT US OUTP UT

SIGNALのオンオフ状態を示す信号を出力します

（３．３．２）

●

MONITORVOLTAGE

出力電圧モニタ用の BNC接栓です。

（３．３．１）

●

MONITOR CURRENT

出力電流モニタ用の BNC接栓です。

（３．３．１）

●

OUTPUT L o

本器の高圧出力の帰還側の端子です。

TOTAL

この端子を使用した場合、浮遊容量などへの漏れ電流と負荷に流れる電流を制御します。

LOAD

この端子を使用した場合、浮遊容量への漏れ電流を無視して負荷に流れる電流を制御します。

（３．２．３）

●出力警告表示灯高電圧出力中は表示灯が点灯しながら回転します。出力電圧が約

4. 9

kV以下で橙色、約

4. 9

kV以上で赤色に点灯します。また電圧レベルにより回転速度が変化し、高電圧ほど高速に回転します。

（３．２．３）

●

DC CURRENT LI MITER

最大出力電流の設定を行います。 LIMIT 制限のみ TRIP 設定値を超えると停止

（３．２．２）

●

VOLTAGE LIMITER

最大出力電圧の設定を行います。

（３．２．２）

●

POWER

本器の電源スイッチです。

（３．４）

●

N/OFF

外部からの直流バイアスを使用するときオンにします。

（３．１．２）

●

EXT DC BIASINPUT

直流バイアスを外部から入力する

BNC

接栓です。

（３．１．２）

●

GAIN

SIGNAL INPUTに入力された信号の利得を調整します。

（３．１．３）

●

NORMAL／INVERT

入出力間の極性を設定します。

NORMAL：入出力同相 INVERT ：入出力逆相

（３．１．３）

●

DC BIAS

つまみ内部直流バイアス用内部信号源のレベルを設定します。

（３．１．１）

●＋／－

内部直流バイアス用信号源の極性を設定します。

（３．１．１）

●

SI G NA L I NP UT

外部発振器からの信号を入力する

BNC

接栓です。

（３．１．３）

●

CURRENT SELECT

OUTPUT Lo端子の接続先に合わせて切り替えます。

（３．２．３）

●

OUTPUT Hi

高圧側の出力端子です。附属の専用高圧ケーブルを繋ぎます。

（３．２．３）

●

RESPONSE

ステップ応答波形の微調を行います。 CV 定電圧モードで使用します。 CC 定電流モードで使用します。

（３．２．２）

●

HI GH VOLTAGEOUTPUT ON/OFF

内部高電圧直流電源のオン・オフスイッチです。

（３．２．３）

●

ON/OFF

内部高電圧直流電源のオンオフ状態を表示します。

（３．２．３）

●

CV/CC DC BI AS CV/CC

動作モードの設定を行います。

CV 定電圧モード CC 定電流モード

CV：直流はCVモード CC：直流もCCモード

（３．２．１）

●

OVERLOAD

過負荷状態やリミッタが動作しているときに点灯します。

（３．２．１）

●ON/OFF

ON when the internal DC bias signal is used.

(3.1.1

)

●+/-

Sets polarity of the internal DC bias signal source.

(3.1.1)

●DC bias knob

Sets the level of the internal signal for the internal DC bias.

(3.1.1)

●POWER

Power switch of this unit.

(3.1.4)

●NORMAL/INVERT

Sets polarity of input/output. NORMAL: Same phase for input/output INVERT: Inverted phase for input/output

(3.1.3)

●ON/OFF

ON when the signal from an external oscillator is used.

(3.1.3)

●GAIN

Adjusts gain of the signal to SIGNAL INPUT.

(3.1.3)

●SIGNAL INPUT

BNC connector to give signal input from an external oscillator.

(3.1.3)

●ON/OFF

ON when the external DC bias is used.

(3.1.2)

●EXT DC BIAS INPUT

BNC connector to give external DC bias input.

(3.1.2)

●

SIGNAL ON/OFF STATUS OUTPUT Gives signal that indicates SIGNAL ON/OFF status.

(3.3.2)

●MONITOR VOLTAGE

BNC connector for output voltage monitor.

(

3.3.1

)

●CURRENT SELECT

Selects current to the OUTPUT Lo terminal connection.

(3.2.3

)

●

MONITOR CURRENT BNC connector for output current monitor.

(

3.3.1

)

●CV/CC DC BIAS CV/CC

Sets the operation mode. CV: Constant voltage mode CC: Constant current mode CV: CV mode for DC CC: CC mode for DC

(3.2.1)

●

Output Lo Return terminal for high voltage output of this unit.

TOTAL

When this terminal is used, total current of the leak current to stray capacitance and the current to load is controlled.

LOAD

When this terminal is used, the current to load is controlled ignoring the leak current to stray capacitance.

(3.2.3)

●Output warning indicator

The indicator lights and rotates during high voltage output. It lights in orange when the output voltage is approx. 4.9 kV or less and red when the voltage is approx. 4.9 kV or more. The rotation speed changes depending on the voltage level. The higher the voltage is, the faster the rotation is.

(3.2.3)

●OUTPUT Hi

Output terminal for high voltage. Connect the accompanying special high voltage cable.

(3.2.3)

●

HIGH VOLTAGE OUTPUT ON/OFF ON/OFF switch of the internal high voltage DC power supply.

(3.2.3)

●ON/OFF

Indicates ON/OFF status of the internal high voltage DC power supply.

(3.2.3)

●OVERLOAD

Lights for overload status or when the limiter is activated.

(3.2.1)

●RESPONSE

Makes fine adjustment of step response waveform. CV: Used in constant voltage mode. CC: Used in constant current mode.

(

3.2.2

)

●DC CURRENT LIMITER

Sets the maximum output current. LIMIT: Only limiting. TRIP: Stops operation when

exceeding the set value.

(3.2.2)

●SIGNAL ON/OFF

ON/OFF switch for input signal to the amplifier.

(

3.1.4

)

●VOLTAGE LIMITER

Sets the maximum output voltage.

(

3.2.2

)

●ON/OFF CONTROL

Switch to change SIGNAL ON/OFF or ON/OFF of each signal to: LOCAL: Panel operation REMOTE: External signal operation

(3.3.2)

Page 52

Page 53

3.5 Nomenclature

HVA4321

3-19

3.5.2 Rear panel

INTDC BIASON/OFFSIGNAL ON/OFF

OSCI NPUT ON/OFF EXTDCBIASON/OFF

HIGHVOLTAGE

POWERSUPPLYON/OFF

TTL(Lo:ON)TTL(Lo:ON)

TTL(Hi:OFF)

REMOTE CONTROL I NPUT

SIGNAL ON/ OFF STATUS

AC250V 3A MAX DC 30V 3 A MAX

～

LI NE

100V

10A／

250V

50Hz／60Hz 800VA MAX

●

SI G NA L O N/OFF

リモート操作時に増幅部へ入力する信号のオン・オフ制御信号を入力します。

（３．３．２

）

●

HIGHVOLTGAEPOWERSUPPLYON/OFF

内部高電圧直流電源のオン・オフを外部信号で制御するときのオン・オフ信号を入力します。外部信号で制御しないときは附属のショートプラグにて短絡しておきます。

（３．３．２）

●

INT DCBIASON/OFF

リモート操作時に内部直流バイアス信号のオン・オフ制御信号を入力します。

（３．３．２）

●

EXT DC BIASON/OFF

リモート操作時に外部直流バイアス信号のオン・オフ制御信号を入力します。

（３．３．２）

●

SIGNALON/ OFFST ATUS

SIGNALオン・オフの状態に連動した接点信号を出力します。

（３．３．２）

●

FUSEHOLDER

ヒューズホルダです。本器ではAC250V 10Aのヒューズを使用します。

（３．４）

●

LI NE

電源ラインを接続するためのインレットです。安全のため必ず附属の3pin電源コードで接地付きコンセントに接続してください。

（３．４）

●

OSC I NP UT ON/OFF

リモート操作時に外部発振器の入力信号のオン・オフ制御信号を入力します。

（３．３．２）

● 電源コードで接地が取れないときに使用する筐体接地端子です。

（３．４）

345

●SIGNAL ON/OFF

Gives ON/OFF control signal input to the amplifier for remote control operation.

(3.3.2)

●INT DC BIAS ON/OFF

Gives ON/OFF control signal of the internal DC bias signal for remote control operation.

(3.3.2)

●FUSE HOLDER

Fuse holder. This unit uses a AC250V 10A fuse.

(3.4)

●LINE

Inlet to connect the power cable. Be sure to connect the accompanying 3 pin power cable to the outlet with ground for safety.

(3.4)

●

Casing ground terminal when grounding is not available with a power cable.

(3.4)

●EXT DC BIAS ON/OFF

Gives ON/OFF control signal of external DC bias signal for remote control operation.

(

3.3.2

)

●SIGNAL ON/OFF STATUS

Gives contact signal output linked to SIGNAL ON/OFF status.

(3.3.2)

●OSC INPUT ON/OFF

Gives ON/OFF control signal input of the external oscillator for remote control operation.

(3.3.2)

●HIGH VOLTAGE POWER SUPPLY ON/OFF

Gives the ON/OFF signal for control of the internal high voltage DC power supply ON/OFF with an external signal. Use the accompanying shorting plug for short-circuit when it is not controlled with an external signal.

(3.3.2)

Page 54

Page 55

4. Operation method

4.1 Operation example in constant voltage mode

･････････

4-1

4.1.1 Panel setting

･････････････････････････････････

4-3

4.1.2 Connection of signal source and connection of load

････････････････････････････

4-6

4.1.3 Power supply and internal high voltage DC power supply

･････････････････････････････

4-9

4.1.4 Signal output and adjustment

･･････････････････

4-11

4.1.5 Signal OFF

･････････････････････････････････

4-13

4.2 Operation example in constant current mode (total)･4-14

4.2.1 Panel setting

･･･････････････････････････････

4-16

4.2.2 Connection of signal source and connection of load

･･････････････････････････

4-19

4.2.3 Power supply and internal high voltage DC power supply

･･･････････････････････････

4-22

4.2.4 Signal output and adjustment

･････････････････

4-24

4.2.5 Signal OFF

･････････････････････････････････

4-26

4.3 Operation example in constant current mode (load)･4-27

4.3.1 Panel setting

･･･････････････････････････････

4-29

4.3.2 Connection of signal source and connection of load

･･････････････････････････

4-32

4.3.3 Power supply and internal high voltage DC power supply

･･･････････････････････････

4-35

4.3.4 Signal output and adjustment

･････････････････

4-37

4.3.5 Signal OFF

･････････････････････････････････

4-39

4.4 Operation example in constant current + constant voltage mode

･･･････････････････････････････････

4-40

4.4.1 Panel setting

･･･････････････････････････････

4-42

4.4.2 Connection of signal source and connection of load

･････････････････････････････････････

4-45

4.4.3 Power supply and internal high voltage DC power supply

･･･････････････････････････････

4-48

4.4.4 Signal output and adjustment

･････････････････

4-50

4.4.5 Signal OFF

･････････････････････････････････

4-52

4.5 Change of load and power OFF

･･･････････････････

4-53

4.5.1 Change of load

･････････････････････････････

4-53

4.5.2 Power supply OFF

･･････････････････････････

4-56

4.6 Remote control

･････････････････････････････････

4-57

4.6.1 Remote control

･････････････････････････････

4-57

4.6.2 Panel setting for use of remote control

･････････

4-58

Page 56

Page 57

4.1 Operation example in constant voltage mode

HVA4321

4-1

4.1 Operation example in constant voltage mode

This section describes operation example for use of this unit in constant voltage mode.

In constant voltage mode, the output voltage changes according to the input signal.

Figure4-1. Constant voltage mode (total mode)

lamp :Output current of high voltage amplifier lint :Leak current with internal capacity lout :Output current lstr :Leak current with wire capacity lload :Load current lac, ldc :DC and AC of detected current

In total mode, from output current lout, DC is detected with current detection resistance and AC is

detected with current transformer CT. Total output of leak current lstr with wire capacity and load current

lload is given to the current monitor.

(Leak current lint (AC) with stray capacity in the amplifier runs through the current detection resistance,

but only DC is detected here. The monitor is hardly affected.)

Effect of stray capacitance of the cable is found only for AC signal output. Effect of stray signal is not found for DC signal. Therefore, use the DC signal in total mode.

！

CAUTION

内部容量

出力端子

配線の容量

負荷抵抗

電流検出抵抗

（トータル用）

（ロード用）

電流モニタ

OUTPUT Hi

OUTPUT Lo

TOTAL

LOAD

Iout

Ii nt

Istr

Il oad

Iamp

Iac

Idc

電圧モニタ

Output terminal

Load

resistance

Wire capacit

Internal capacit

Current detection

resistance

(

for total

)

Current monitor

Voltage monitor

Current detection resistance (for load)

Page 58

4.1 Operation example in constant voltage mode

HVA4321

4-2

Figure4-2. Constant voltage mode (load mode)

lamp : Output current of high voltage amplifier lint : Leak current with internal capacity lout : Output current lstr : Leak current with wire capacity lload : Load current lac, ldc : DC and AC of detected current

In load mode, only load current is directly detected. The current monitor can monitor load current only.

In load mode of constant voltage mode:

○Advantage

・Only load current can be monitored.

○Disadvantage

・One end of load cannot be directly grounded. There is a current detection resistance

(33Ω) between load end and ground.

・The voltage of output current x current detection resistance (33Ω) for set output voltage is an

error in load. (When the load current is 10 mA, the error is 330 mV.)

内部容量

出力端子

配線の容量

負荷抵抗

電流検出抵抗

（トータル用）

（ロード用）

電流モニタ

OUTPUT Hi

OUTPUT Lo

TOTAL

LOAD

Iout

Ii nt

Istr

Il oad

Iamp

Idc+Iac

電圧モニタ

Output terminal

Load

resistance

Wire capacit

Internal capacit

Current detection

resistance

(

for total

)

Current monitor

Voltage monitor

Current detection resistance (for load)

Page 59

4.1 Operation example in constant voltage mode

HVA4321

4-3

4.1.1 Panel setting

a) Internal high voltage DC power OFF

When the HIGH VOLTAGE POWER SUPPLY switch is not OFF, press the button until a "click" sound is

heard. When a click sound is heard, the switch is locked in OFF status. The internal high voltage DC

power supply is always OFF.

Figure4-3. Internal high voltage DC power OFF

b) Signal system OFF

Turn the internal DC bias knob to the leftmost position to minimize the value. Turn OFF the switches of

DC BIAS, OSC INPUT and EXT DC BIAS INPUT.

Figure4-4. Switch settings

DC BIAS

0-10

OFF

INVERT

NORMAL

GAIN

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

PULL ON

カチッと音がするまで押します。

ロックされた状態

オフ

オン

側面より

From side

OFF Locked status

Press the switch until a click sound is heard.

Page 60

4.1 Operation example in constant voltage mode

HVA4321

4-4

c) Output mode settings

Set the output mode switch to CV. In constant voltage mode, the DC bias setting is invalid.

Figure4-5. Output mode settings

d) Remote/local settings

To operate this unit from the panel, set the ON/OFF CONTROL switch to LOCAL.Refer to "4.6 Remote

control operation" for remote control operation.

Figure4-6. Local settings

OVERLOAD

1kV/1V

1mA/1V

DC BIAS

1kV/1V

1mA/1V

CURRENT

SELECT

LOAD

TOTAL

ON/OFF

CONTROL

REMOTE

LOCAL

OFF

EXT DC BIAS

OUTPUT

TTL(Lo: ON) Zout 10k

SIGNAL ON/ OFF STAT US

OUTPUT

MONITOR

1V/1kV

Zout 50

VOLTAGE

CURRENT

10V MAX

Zi n 10 k

1V/1mA

Zout 50

Page 61

4.1 Operation example in constant voltage mode

HVA4321

4-5

e) Output limiter settings

To limit the output voltage and output current, set the limiter level as required.

Figure4-7. Limiter settings

 Voltage limiter

The voltage limiter function can limit the maximum value of the output voltage independently for

positive and negative values in the range from ±5 kV to ±10 kV. For example, the output is sufficient

up to ±8 kV, set the VOLTAGE LIMITER to 8 kV and -8 kV.

When voltage limitation is not required, set it to MAX.

 Current limiter

The current limiter function can limit the average value of the output current in the range from 0 mA to ±10 mA. For example, to limit the output current up to 5 mA, set it to 5 mA.

When current limitation is not required, set it to 10 mA which is turned to the rightmost position.

 LIMIT/TRIP

Set the protection mode for activation of the current limiter. When LIMIT is selected, current is limited

to the set current. When TRIP is selected, the input signal is immediately OFF for activation of the

current limiter circuit and the output is 0V.

Select either one as required.

f) Current monitor mode settings

In total mode, set it to TOTAL CURRENT and in load mode, set it to LOAD CURRENT.

Figure4-8. Current monitor mode settings

TRIP

VOLTAGE(kV)

-5

-10

MAX

LI MIT

DC CURRENT( mA)

LI MITER

CURRENT

SELECT

LOAD

TOTAL

Page 62

4.1 Operation example in constant voltage mode

HVA4321

4-6

g) RESPONSE knob settings

Set the CV RESPONSE knob to TOP.

Figure4-9. Response settings

4.1.2 Connection of signal source and connection of load

a) Connection of input signal source

Give the signal generator (e.g. oscillator) output to OSC INPUT. When applying the external DC bias,

give the DC signal source output to EXT DC BIAS INPUT.

The input voltage of the OSC INPUT terminal and the EXT DC BIAS INPUT terminal is maximum ±10V.

Figure4-10. Connection of external signal source signal

信号発生器

直流基準電源

OFF

GAIN

OSC

INPUT

10V MAX

Zi n 1 0 k

EXT DC BIAS

OUTPUT

10V MAX

Zi n 1 0 k

Signal generator

DC standard power supply

RESPONSE

CV CC

真上にします。

Set it to TOP.

Page 63

4.1 Operation example in constant voltage mode

HVA4321

4-7

b) Monitor signal output

Connect a measuring instrument such as oscilloscope or voltmeter to VOLTAGE MONITOR or

CURRENT MONITOR as required.

Figure4-11. Connection of monitor

c) Connection of load

Be sure to use the accompanying cable for the cable connected to Hi. To minimize effect from stray

capacitance, shorten the cable length as much as possible and keep it away from the floor or other devices.

Connect the output return wire to TOTAL CURRENT terminal in total mode.

Connect it to LOAD CURRENT in load mode.

Figure4-12. Connection of output cable

電圧計

SIGNAL ON/ OFF STATUS

OUTPUT

MONITOR

VOLTAGE

CURRENT

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT Lo

オシロスコープ

Voltmeter

Oscilloscope

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT Lo

10kV MAX

10 mA MAX

OUTPUT Hi

緩まないようにしっかりと締めてください。

負荷

附属の高圧ケーブル

附属のリターンケーブル

Tighten it securely

Accompanying high

volta

e cable

ccompanying return cable

Load

Page 64

4.1 Operation example in constant voltage mode

HVA4321

4-8

！

Match the setting of the return terminal with that of the CURRENT SELECT switch. If it is different, current cannot be monitored. The TOTAL CURRENT terminal is connected to the casing.

Tighten the binding post terminal of OUTPUT Lo securely. If it is loose, electric shock may occur when

touching the load grounding or the return cable.

Check sometimes if it is not loose when the power is OFF and it is safe.

WARNING

！

CAUTION

Page 65

4.1 Operation example in constant voltage mode

HVA4321

4-9

4.1.3 Power supply and internal high voltage DC power supply

a) Power supply

Before supply of power, check again if the HIGH VOLTAGE POWER SUPPLY switch is OFF (button is

pressed). After checking connection to load, connection to the signal source and if the panel settings are

correct, turn ON the POWER switch of the unit.

When the power is ON, the fan at the back starts operation.

On the panel surface:

・The OFF lamp of the signal switch blinks. ・The OFF LED of the internal high voltage DC power supply lights.

Figure4-13. Power supply

b) Supply of high voltage DC power

Turn the HIGH VOLTAGE POWER SUPPLY switch to the right and unlock it. Turn ON the internal high

voltage power supply. The ON LED of the internal high voltage power supply lights. In several seconds,

the SIGNAL switch OFF lamp changes from blinking to lighting.

When the power is supplied, the internal high voltage DC power supply is always OFF regardless of

ON/OFF status of the HIGH VOLTAGE POWER SUPPLY switch. If this switch is ON, turn OFF once

and turn it ON again.

POWER

DC BIAS

0-10

オンにします。

Turn ON.

Page 66

4.1 Operation example in constant voltage mode

HVA4321

4-10

！

Figure4-14. Internal high voltage DC power ON

After this operation, the internal high voltage DC power supply is ON. High voltage is generated inside the

unit.

Be careful not to touch the area like an output terminal to which high voltage is applied.

○When the SIGNAL OFF switch remains blinking.

When the SIGNAL OFF switch remains blinking after unlocking the HIGH VOLTAGE POWER

SUPPLY switch, check the following:

1) Is the shorting plug inserted into the HIGH VOLTAGE POWER SUPPLY ON/OFF terminal at the

back?

Action

Insert the shorting plug for operation in LOCAL mode.

2) Is the DC CURRENT value the minimum and is TRIP selected?

Action

Increase the current limit or select LIMIT.

3) Is temperature of exhaust air extremely high?

Action

Temperature in the casing may be too high. Leave the unit at a cool environment for dozens of

minutes. Then, turn ON the HIGH VOLTAGE POWER SUPPLY switch again.

4) Are all fans at the back operating?

Action

Check if there is any object that blocks rotation of a fan. If a fan does not rotate without any

blocking, the fan may be faulty. It must be repaired.

WARNING

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

PULL ON

右に回して、ロックを解除します。

ONのLEDが点灯します。

Turn to the right for unlocking.

ON LED lights.

Be sure to press the above switch to turn OFF the HV power for safety when the output wiring is changed.

Page 67

4.1 Operation example in constant voltage mode

HVA4321

4-11

When either of the above is not applicable, the internal high voltage DC power supply may be faulty.

In this case, it must be repaired.

4.1.4 Signal output and adjustment

a) Using internal DC bias signal source

Make sure that the internal DC signal source dial is 0. Set the polarity switch to the desired polarity. Turn

ON the internal DC bias signal source ON/OFF switch and press ON of the SIGNAL switch. While

reading the value on the voltmeter or oscilloscope connected to the voltage monitor, turn the dial

gradually to the right. Set it to the desired voltage.

Figure4-15. Using internal DC bias signal

b) Using external oscillator

Connect the external oscillator to OSC INPUT and make sure that the oscillator output level is 0V. Set the

GAIN knob to TOP. Turn ON the external oscillator ON/OFF switch and press ON of the SIGNAL switch.

While reading the value on the voltmeter or oscilloscope connected to the voltage monitor, increase the

output level of the oscillator gradually.

If fine adjustment of the output level is required, adjust it at the oscillator or adjust it with GAIN of the

unit. Turn GAIN to the left, the gain is decreased. Turn GAIN to the right, the gain is increased. The gain

can be adjusted in the range of approximately ±3%.

DC BIAS

0-10

OFF

SIGNAL

OFF

0にする。

極性を選ぶ。

ONにする。

希望のレベルに調整する。

DC BIAS

0-10

Set to 0

Select polarity

Turn ON

Press ON

Adjust it to the

desired level.

Page 68

4.1 Operation example in constant voltage mode

HVA4321

4-12

Figure4-16. Using external oscillator

c) Using external DC bias signal source

Connect the DC standard power supply to EXT DC BIAS INPUT and make sure that the output of the

standard power supply is 0V. Turn ON the external DC bias ON/OFF switch and press ON of the SIGNAL

switch. While reading the value on the voltmeter or oscilloscope connected to the voltage monitor,

increase the output level of the DC standard power supply gradually and set the desired voltage.

Figure4-17. Using external DC bias signal

 High voltage display

When the output voltage exceeds ±130V to ±150V, the high voltage output LED lights and starts

rotation slowly. The higher the output voltage is, the faster the rotation is.

When the voltage exceeds ±4.9 kV, the color changes from orange to red.

 Gain adjustment with RESPONSE

The gain of 1 kHz band or more may vary depending on the RESPONSE knob position. Refer to "5.2

Characteristics in constant voltage mode, Chapter 5".

When the frequency is used at 1 kHz or more, measure the output voltage of the voltage monitor and

adjust RESPONSE so that the desired amplitude may be obtained.

OFF

SIGNAL

OFF

0にする。

極性を選ぶ。

ONにする。

希望のレベルに調整する。

NORMAL

INVER

GAI N

真上にする。

GAI N

微調整する。

Set to 0

Select polarity Turn ON

Press ON

Adjust it to the

desired level.

Make fine

adjustment

Set to TOP

Oscillator

OFF

SIGNAL

OFF

0にする。

ONにする。

希望のレベルに調整する。

Set to 0

Turn ON

Press ON

Adjust it to the

desired level.

DC standard power supply

Page 69

4.1 Operation example in constant voltage mode

HVA4321

4-13

！

It is very dangerous during output of high voltage. Never touch the output cable or the high voltage area.

If you find a dangerous status due to a unit error or load error, turn OFF the POWER switch immediately.

4.1.5 Signal OFF

a) Input signal OFF

To set the output signal to 0V temporarily, press OFF of the SIGNAL switch.

When SIGNAL is OFF, the output voltage is 0V, but the internal high voltage DC power supply is ON. It

continuously gives high voltage output.

In this status, never touch the output cable or the high voltage area for safety.

b) Internal high voltage DC power supply OFF

When the HIGH VOLTAGE POWER SUPPLY switch is turned OFF, the output of the internal high

voltage DC power supply is 0V and the amplifier cannot give high voltage output.

WARNING

Page 70

4.2 Operation example in constant current mode (total)

HVA4321

4-14

！

4.2 Operation example in constant current mode (total)

This section describes operation example of this unit in total mode of constant current mode.

In constant current mode, the output current varies according to the input signal. If high frequency AC

signal is given at high voltage, leak current runs with stray capacitance between the cable and the ground.

Therefore, not all current from the output terminal of the unit goes to load.

In total mode, current including leak current due to cable capacity is controlled.

Set current = Leak current + Load current

Effect of stray capacitance of the cable is found only for AC signal output. Effect of stray signal is not found for DC signal.

The TOTAL terminal of OUTPUT Lo is connected to the casing (= ground). Therefore, the total mode can be used for grounded load or load that can be grounded.

When the internal high voltage DC power supply is ON and SIGNAL is ON with the output open,

maximum ±12 kV output is given to the OUTPUT Hi terminal. It is very dangerous.

Do not turn ON SIGNAL when the output is open.

In constant current mode, be sure to connect load or short-circuit the output.

When the internal high voltage DC power supply is ON and SIGNAL is OFF with the output open, ±100V

voltage output may be given to the OUTPUT Hi terminal depending on the voltage limiter settings.

In constant current mode, DC cannot be run for capacity load. At this time, the output for DC signal is the

same as that in open status. When SIGNAL is ON, maximum ±12 kV output is given to the OUTPUT Hi

terminal.

Never apply DC to capacity load in constant current mode.

WARNING

Page 71

4.2 Operation example in constant current mode (total)

HVA4321

4-15

Figure4-18. Total mode

lamp : Output current of amplifier lint : Leak current with internal capacity lout : Output current lstr : Leak current with wire capacity lload : Load current lac, ldc : DC and AC of detected current

Not all current lout from the output terminal is supplied to load. There is leak of lstr with wire capacity.

Actual current to load is lload = lout - lstr.

In total mode, control is made to satisfy set current = lout = lload + lstr.

In total mode, from output current lout, DC is detected with current detection resistance and AC is

detected with current transformer CT. Total output of leak current lstr with wire capacity and load current

lload is given to the current monitor.

(Leak current lint (AC) with stray capacity in the amplifier runs through the current detection resistance,

but only DC is detected here. The monitor is hardly affected.)

内部容量

出力端子

配線の容量

負荷抵抗

電流検出抵抗

（トータル用）

（ロード用）

電流モニタ

OUTPUT Hi

OUTPUT Lo

TOTAL

LOAD

Iout

Ii nt

Istr

Il oad

Iamp

Iac

Idc

電圧モニタ

Output terminal

Load

resistance

Wire capacit

Internal capacit

Current detection

resistance

(

for total

)

Current monitor

Voltage monitor

Current detection resistance (for load)

Page 72

4.2 Operation example in constant current mode (total)

HVA4321

4-16

4.2.1 Panel setting

a) Internal high voltage DC power supply OFF

When HIGH VOLTAGE POWER SUPPLY is not OFF, press the button until a "click" sound is heard.

When a click sound is heard, the switch is locked in OFF status. The internal high voltage DC power

supply is always OFF.

Figure4-19. Internal high voltage DC power OFF

b) Signal system OFF

Turn the internal DC bias knob to the leftmost position to minimize the value. Turn OFF the switches of

DC BIAS, OSC INPUT and EXT DC BIAS INPUT.

Figure4-20. Switch settings

DC BIAS

0-10

OFF

INVERT

NORMAL

GAIN

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

PULL ON

カチッと音がするまで押します。

ロックされた状態

オフ

オン

側面より

From side

OFF Locked status

Press the switch until a click sound is heard.

Page 73

4.2 Operation example in constant current mode (total)

HVA4321

4-17

c) Output mode settings

Set the output mode switch to CC. Set the DC BIAS to CC.

Figure4-21. Output mode settings

d) Remote/local settings

To operate this unit from the panel, set the ON/OFF CONTROL switch to LOCAL.

Refer to "4.6 Remote control operation" for remote control operation.

Figure4-22. Local settings

OVERL OA D

1kV/1V

1mA/1V

DC BI AS

1kV/1V

1mA/1V

CURRENT

SELECT

LOAD

TOTAL

ON/OFF

CONTROL

REMOTE

LOCAL

OFF

EXT DC BI AS

OUTPUT

TTL(Lo:ON) Zout 10k

SI GNAL ON/OFF STATUS

OUTPUT

MONITOR

1V/1kV

Zout 50

VOLTAGE

CURRENT

10V MAX

Zi n 1 0 k

1V/ 1mA

Zout 50

Page 74

4.2 Operation example in constant current mode (total)

HVA4321

4-18

e) Output limiter settings

To limit the output voltage and output current, set the limiter level as required.

Figure4-23. Limiter settings

 Voltage limiter

The voltage limiter function can limit the maximum value of the output voltage independently for

positive and negative values in the range from ±5 kV to ±10 kV.

For example, the output is sufficient up to ±8 kV, set the VOLTAGE LIMITER to 8 kV and -8 kV.

When voltage limitation is not required, set it to MAX.

 Current limiter

The current limiter function can limit the average value of the output current in the range from 0 mA to

±10 mA.

For example, to limit the output current up to 5 mA, set it to 5 mA.

When current limitation is not required, set it to 10 mA which is turned to the rightmost position.

 LIMIT/TRIP

Set the protection mode for activation of the current limiter. When LIMIT is selected, current is limited

to the set current. When TRIP is selected, the input signal is immediately OFF for activation of the

current limiter circuit and the output is 0V.

Select either one as required.

f) Current monitor mode settings

In total mode of constant current mode, set it to TOTAL CURRENT

Figure4-24. Current monitor mode settings

TRIP

VOLTAGE(kV)

-5

-10

MAX

LI MIT

DC CURRENT( mA)

LI MITER

CURRENT

SELECT

LOAD

TOTAL

Page 75

4.2 Operation example in constant current mode (total)

HVA4321

4-19

g) RESPONSE knob settings

Set the CC RESPONSE knob to the rightmost position.

Figure4-25. Response settings

4.2.2 Connection of signal source and connection of load

a) Connection of input signal source

Give the signal generator (e.g. oscillator) output to OSC INPUT. When applying the external DC bias,

give the DC signal source output to EXT DC BIAS INPUT.

The input voltage of the OSC INPUT terminal and the EXT DC BIAS INPUT terminal is maximum ±10V.

Figure4-26. Connection of external signal source signal

RESPONSE

CV CC

右に回しきります。

Turn to the rightmost

信号発生器

直流基準電源

OFF

GAIN

OSC

INPUT

10V MAX

Zin 10k

EXT DC BI AS

OUTPUT

10V MAX

Zi n 1 0 k

Signal generator

DC standard power supply

Page 76

4.2 Operation example in constant current mode (total)

HVA4321

4-20

b) Monitor signal output

Connect a measuring instrument such as oscilloscope or voltmeter to VOLTAGE MONITOR or

CURRENT MONITOR as required.

Figure4-27. Connection of monitor

c) Connection of load

Be sure to use the accompanying cable for the cable connected to Hi.

To minimize effect from stray capacitance, shorten the cable length as much as possible and keep it away

from the floor or other devices.

Connect the return wire to the TOTAL CURRENT terminal.

Figure4-28. Connection of output cable

電圧計

SIGNAL ON/ OFF STAT US

OUTPUT

MONITOR

VOLTAGE

CURRENT

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT L o

オシロスコープ

Voltmeter

Oscilloscope

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT Lo

10kV MAX

10mA MAX

OUTPUT Hi

緩まないようにしっかりと締めてください。

負荷

附属の高圧ケーブル

附属のリターンケーブル

Tighten it securely

Accompanying high

volta

e cable

ccompanying return cable

Load

Page 77

4.2 Operation example in constant current mode (total)

HVA4321

4-21

！

In total mode, be sure to use the TOTAL CURRENT terminal. If the LOAD CURRENT terminal is used, the operation may be faulty. The TOTAL CURRENT terminal is connected to the casing.

Tighten the binding post terminal of OUTPUT Lo securely. If it is loose, electric shock may occur when

touching the load grounding or the return cable.

Check sometimes if it is not loose when it is safe with the power OFF.

WARNING

！

CAUTION

Page 78

4.2 Operation example in constant current mode (total)

HVA4321

4-22

4.2.3 Power supply and internal high voltage DC power supply

a) Power supply

Before supply of power, check again if the HIGH VOLTAGE POWER SUPPLY switch is OFF (button is

pressed). After checking connection to load, connection to the signal source and if the panel settings are

correct, turn ON the POWER switch of the unit.

When the power is ON, the fan at the back starts operation.

On the panel surface:

・The OFF lamp of the signal switch blinks. ・The OFF LED of the internal high voltage DC power supply lights.

Figure4-29. Power supply

b) Supply of high voltage DC power

Turn the HIGH VOLTAGE POWER SUPPLY switch to the right and unlock it. Turn ON the internal high

voltage power supply. The ON LED of the internal high voltage power supply lights. In several seconds,

the SIGNAL switch OFF lamp changes from blinking to lighting.

When the power is supplied, the internal high voltage DC power supply is always OFF regardless of

ON/OFF status of the HIGH VOLTAGE POWER SUPPLY switch. If this switch is ON, turn OFF once

and turn it ON again.

POWER

DC BIAS

0-10

オンにします。

Turn ON.

Page 79

4.2 Operation example in constant current mode (total)

HVA4321

4-23

！

Figure4-30. Internal high voltage DC power ON

After this operation, the internal high voltage DC power supply is ON. High voltage is generated inside the

unit.

Be careful not to touch the area like an output terminal to which high voltage is applied.

○When the SIGNAL OFF switch remains blinking.

When the SIGNAL OFF switch remains blinking after unlocking the HIGH VOLTAGE POWER

SUPPLY switch, check the following:

1) Is the shorting plug inserted into the HIGH VOLTAGE POWER SUPPLY ON/OFF terminal at the

back?

Action

Insert the shorting plug for operation in LOCAL mode.

2) Is the DC CURRENT value the minimum and is TRIP selected?

Action

Increase the current limit or select LIMIT.

3) Is temperature of exhaust air extremely high?

Action

Temperature in the casing may be too high. Leave the unit at a cool environment for dozens of

minutes. Then, turn ON the HIGH VOLTAGE POWER SUPPLY switch again.

4) Are all fans at the back operating?

Action

Check if there is any object that blocks rotation of a fan. If a fan does not rotate without any

blocking, the fan may be faulty. It must be repaired.

WARNING

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

PULL ON

右に回して、ロックを解除します。

ONのLEDが点灯します。

Turn to the right for unlocking.

ON LED lights.

Be sure to press the above switch to turn OFF the HV power for safety when the output wiring is changed.

Page 80

4.2 Operation example in constant current mode (total)

HVA4321

4-24

When either of the above is not applicable, the internal high voltage DC power supply may be faulty.

In this case, it must be repaired.

4.2.4 Signal output and adjustment

a) Using internal DC bias signal source

Make sure that the internal DC signal source dial is 0. Set the polarity switch to the desired polarity. Turn

ON the internal DC bias signal source ON/OFF switch and press ON of the SIGNAL switch. While

reading the value on the voltmeter or oscilloscope connected to the voltage monitor, turn the dial

gradually to the right. Set it to the desired voltage.

Figure4-31. Using internal DC bias signal

b) Using external oscillator

Connect the external oscillator to OSC INPUT and make sure that the oscillator output level is 0V. Set the

GAIN knob to TOP. Turn ON the external oscillator ON/OFF switch and press ON of the SIGNAL switch.

While reading the value on the voltmeter or oscilloscope connected to the voltage monitor, increase the

output level of the oscillator gradually.

If fine adjustment of the output level is required, adjust it at the oscillator or adjust it with GAIN of the

unit. Turn GAIN to the left, the gain is decreased. Turn GAIN to the right, the gain is increased. The gain

can be adjusted in the range of approximately ±3%.

DC BIAS

0-10

OFF

SIGNAL

OFF

0にする。

極性を選ぶ。

ONにする。

希望のレベルに調整する。

DC BIAS

0-10

Set to 0

Select polarity

Turn ON

Press ON

Adjust it to the

desired level.

Page 81

4.2 Operation example in constant current mode (total)

HVA4321

4-25

Figure4-32. Using external oscillator

c) Using external DC bias signal source

Connect the DC standard power supply to EXT DC BIAS INPUT and make sure that the output of the

standard power supply is 0V. Turn ON the external DC bias ON/OFF switch and press ON of the SIGNAL

switch.

While reading the value on the voltmeter or oscilloscope connected to the voltage monitor, increase the

output level of the DC standard power supply gradually and set the desired voltage.

Figure4-33. Using external DC bias signal

 High voltage display

When the output voltage exceeds ±130V to ±150V, the high voltage output LED lights and starts

rotation slowly. The higher the output voltage is, the faster the rotation is.

When the voltage exceeds ±4.9 kV, the color changes from orange to red.

 Gain adjustment with RESPONSE

The gain of 200 kHz band or more may vary depending on the RESPONSE knob position. Refer to

"5.3 Characteristics in constant voltage mode, Chapter 5".

When the frequency is used at 200 Hz or more, measure the output voltage of the voltage monitor and

adjust RESPONSE so that the desired amplitude may be obtained.

OFF

SIGNAL

OFF

0にする。

極性を選ぶ。

ONにする。

希望のレベルに調整する。

NORMAL

INVER

GAI N

真上にする。

GAI N

微調整する。

Set to 0

Select polarity Turn ON

Press ON

Adjust it to the

desired level.

Make fine

adjustment

Set to TOP

Oscillator

OFF

SIGNAL

OFF

0にする。

ONにする。

希望のレベルに調整する。

Set to 0

Turn ON

Press ON

Adjust it to the

desired level.

DC standard power supply

Page 82

4.2 Operation example in constant current mode (total)

HVA4321

4-26

！

It is very dangerous during output of high voltage. Never touch the output cable or the high voltage area.

If you find a dangerous status due to a unit error or load error, turn OFF the POWER switch immediately.

4.2.5 Signal OFF

a) Input signal OFF

To set the output signal to 0V temporarily, press OFF of the SIGNAL switch.

When SIGNAL is OFF, the output voltage is 0V, but the internal high voltage DC power supply is ON. It

continuously gives high voltage output.

In this status, never touch the output cable or the high voltage area for safety.

b) Internal high voltage DC power supply OFF

When the HIGH VOLTAGE POWER SUPPLY switch is turned OFF, the output of the internal high

voltage DC power supply is 0V and the amplifier cannot give high voltage output.

WARNING

Page 83

4.3 Operation example in constant current mode (load)

HVA4321

4-27

！

4.3 Operation example in constant current mode (load)

This section describes operation example of this unit in load mode of constant current mode.

In constant current mode, the output current varies according to the input signal.

In load mode, load current is correctly controlled ignoring effect due to leak current with cable capacity.

Effect of stray capacitance of the cable is found only for AC signal output. Effect of stray signal is not found for DC signal. Therefore, use the unit in total mode for DC signal.

In load mode, leak current with stray capacitance and load current are detected from different routes. Therefore, load mode cannot be used for load which is grounded.

When the internal high voltage DC power supply is ON and SIGNAL is ON with the output open,

maximum ±12 kV output is given to the OUTPUT Hi terminal. It is very dangerous. Do not turn ON

SIGNAL when the output is open.

In constant current mode, be sure to connect load or short-circuit the output.

When the internal high voltage DC power supply is ON and SIGNAL is OFF with the output open, ±100V

voltage output may be given to the OUTPUT Hi terminal depending on the voltage limiter settings.

In constant current mode, DC cannot be run for capacity load. At this time, the output for DC signal is the

same as that in open status. When SIGNAL is ON, maximum ±12 kV output is given to the OUTPUT Hi

terminal.

Never apply DC to capacity load in constant current mode.

WARNING

Page 84

4.3 Operation example in constant current mode (load)

HVA4321

4-28

Figure4-34. Load mode

Not all current lout from the output terminal is supplied to load. There is leak of lstr with wire capacity.

Actual current to load is lload = lout - lstr.

In load mode, lload and lstr are returned through different routes and only lload is detected to control

output current.

Therefore, Set current = lload

lout = lload + lstr

Current lout from the output terminal cannot exceed the maximum current of this unit.

In load mode, load current is directly detected. Only load current can be monitored with the current

monitor.

内部容量

出力端子

配線の容量

負荷抵抗

電流検出抵抗

（トータル用）

（ロード用）

電流モニタ

OUTPUT Hi

OUTPUT Lo

TOTAL

LOAD

Iout

Ii nt

Istr

Il oad

Iamp

Idc+Iac

電圧モニタ

Output terminal

Load

resistance

Wire capacit

Internal capacit

Current detection

resistance

(

for total

)

Current monitor

Voltage monitor

Current detection resistance (for load)

！

CAUTION

Page 85

4.3 Operation example in constant current mode (load)

HVA4321

4-29

4.3.1 Panel setting

a) Internal high voltage DC power supply OFF

When HIGH VOLTAGE POWER SUPPLY is not OFF, press the button until a "click" sound is heard.

When a click sound is heard, the switch is locked in OFF status. The internal high voltage DC power

supply is always OFF.

Figure4-35. Internal high voltage DC power OFF

b) Signal system OFF

Turn the internal DC bias knob to the leftmost position to minimize the value. Turn OFF the switches of

DC BIAS, OSC INPUT and EXT DC BIAS INPUT.

Figure4-36. Switch settings

DC BIAS

0-10

OFF

INVERT

NORMAL

GAIN

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

PULL ON

カチッと音がするまで押します。

ロックされた状態

オフ

オン

側面より

From side

OFF Locked status

Press the switch until a click sound is heard.

Page 86

4.3 Operation example in constant current mode (load)

HVA4321

4-30

c) Output mode settings

Set the output mode switch to CC. Set the DC BIAS to CC.

Figure4-37. Output mode settings

d) Remote/local settings

To operate this unit from the panel, set the ON/OFF CONTROL switch to LOCAL.

Refer to "4.6 Remote control operation" for remote control operation.

Figure4-38. Local settings

OVERL OA D

1kV/1V

1mA/1V

DC BI AS

1kV/1V

1mA/1V

CURRENT

SELECT

LOAD

TOTAL

ON/OFF

CONTROL

REMOTE

LOCAL

OFF

EXT DC BIAS

OUTPUT

TTL(Lo: ON) Zout 10k

SIGNAL ON/ OFF STAT US

OUTPUT

MONITOR

1V/1kV

Zout 50

VOLTAGE

CURRENT

10V MAX

Zi n 10 k

1V/1mA

Zout 50

Page 87

4.3 Operation example in constant current mode (load)

HVA4321

4-31

e) Output limiter settings

To limit the output voltage and output current, set the limiter level as required.

Figure4-39. Limiter settings

 Voltage limiter

The voltage limiter function can limit the maximum value of the output voltage independently for

positive and negative values in the range from ±5 kV to ±10 kV. For example, the output is sufficient

up to ±8 kV, set the VOLTAGE LIMITER to 8 kV and -8 kV.

When voltage limitation is not required, set it to MAX.

 Current limiter

The current limiter function can limit the average value of the output current in the range from 0 mA to

±10 mA. For example, to limit the output current up to 5 mA, set it to 5 mA.

When current limitation is not required, set it to 10 mA which is turned to the rightmost position.

 LIMIT/TRIP

Set the protection mode for activation of the current limiter. When LIMIT is selected, current is limited

to the set current. When TRIP is selected, the input signal is immediately OFF for activation of the

current limiter circuit and the output is 0V.

Select either one as required.

f) Current monitor mode settings

In load mode of constant current mode, set it to LOAD CURRENT.

Figure4-40. Current monitor mode settings

TRIP

VOLTAGE(kV)

-5

-10

MAX

LI MIT

DC CURRENT( mA)

LI MITER

CURRENT

SELECT

LOAD

TOTAL

Page 88

4.3 Operation example in constant current mode (load)

HVA4321

4-32

g) RESPONSE knob settings

Set the CC RESPONSE knob to the rightmost position.

Figure4-41. Response settings

4.3.2 Connection of signal source and connection of load

a) Connection of input signal source

Give the signal generator (e.g. oscillator) output to OSC INPUT. When applying the external DC bias,

give the DC signal source output to EXT DC BIAS INPUT.

The input voltage of the OSC INPUT terminal and the EXT DC BIAS INPUT terminal is maximum ±10V.

Figure4-42. Connection of external signal source signal

RESPONSE

CV CC

右に回しきります。

Turn to the rightmost

信号発生器

直流基準電源

OFF

GAIN

OSC

INPUT

10V MAX

Zin 10k

EXT DC BI AS

OUTPUT

10V MAX

Zi n 1 0 k

Signal generator

DC standard power supply

Page 89

4.3 Operation example in constant current mode (load)

HVA4321

4-33

b) Monitor signal output

Connect a measuring instrument such as oscilloscope or voltmeter to VOLTAGE MONITOR or

CURRENT MONITOR as required.

Figure4-43. Connection of monitor

c) Connection of load

Be sure to use the accompanying cable for the cable connected to Hi.

To minimize effect from stray capacitance, shorten the cable length as much as possible and keep it away

from the floor or other devices.

Connect the return wire from load to the LOAD CURRENT terminal. Connect the ground line where leak

current runs with stray capacitance to the TOTAL CURRENT terminal.

Figure4-44. Connection of output cable

電圧計

SIGNAL ON/ OFF STAT US

OUTPUT

MONITOR

VOLTAGE

CURRENT

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT L o

オシロスコープ

Voltmeter

Oscilloscope

LOAD

CURRENT

TOTAL

CURRENT

OUTPUT Lo

10kV MAX

10mA MAX

OUTPUT Hi

緩まないようにしっかりと締めてください。

負荷

附属の高圧ケーブル

附属のリターンケーブル

グランドプレーンなど

浮遊容量

Tighten it securely

Accompanying high

voltage cable

ccompanying return cable

Load

Ground plane, etc.

Stray ca

acitance

Page 90

4.3 Operation example in constant current mode (load)

HVA4321

4-34

！

In load mode, be sure to use the LOAD CURRENT terminal for the return terminal of load current. Use the TOTAL CURRENT terminal for the return terminal of leak current.

Tighten the binding post terminal of OUTPUT Lo securely. If it is loose, electric shock may occur when

touching the load grounding or the return cable.

Check sometimes if it is not loose when it is safe with the power OFF.

WARNING

！

CAUTION

Page 91

4.3 Operation example in constant current mode (load)

HVA4321

4-35

4.3.3 Power supply and internal high voltage DC power supply

a) Power supply

Before supply of power, check again if the HIGH VOLTAGE POWER SUPPLY switch is OFF (button is

pressed). After checking connection to load, connection to the signal source and if the panel settings are

correct, turn ON the POWER switch of the unit.

When the power is ON, the fan at the back starts operation.

On the panel surface:

・The OFF lamp of the signal switch blinks. ・The OFF LED of the internal high voltage DC power supply lights.

Figure4-45. Power supply

b) Supply of high voltage DC power

Turn the HIGH VOLTAGE POWER SUPPLY switch to the right and unlock it. Turn ON the internal high

voltage power supply. The ON LED of the internal high voltage power supply lights. In several seconds,

the SIGNAL switch OFF lamp changes from blinking to lighting.

When the power is supplied, the internal high voltage DC power supply is always OFF regardless of

ON/OFF status of the HIGH VOLTAGE POWER SUPPLY switch. If this switch is ON, turn OFF once

and turn it ON again.

POWER

DC BIAS

0-10

オンにします。

Turn ON.

Page 92

4.3 Operation example in constant current mode (load)

HVA4321

4-36

！

Figure4-46. Internal high voltage DC power ON

After this operation, the internal high voltage DC power supply is ON. High voltage is generated inside the

unit.

Be careful not to touch the area like an output terminal to which high voltage is applied.

○When the SIGNAL OFF switch remains blinking.

When the SIGNAL OFF switch remains blinking after unlocking the HIGH VOLTAGE POWER

SUPPLY switch, check the following:

1) Is the shorting plug inserted into the HIGH VOLTAGE POWER SUPPLY ON/OFF terminal at the

back?

Action

Insert the shorting plug for operation in LOCAL mode.

2) Is the DC CURRENT value the minimum and is TRIP selected?

Action

Increase the current limit or select LIMIT.

3) Is temperature of exhaust air extremely high?

Action

Temperature in the casing may be too high. Leave the unit at a cool environment for dozens of

minutes. Then, turn ON the HIGH VOLTAGE POWER SUPPLY switch again.

4) Are all fans at the back operating?

Action

Check if there is any object that blocks rotation of a fan. If a fan does not rotate without any

blocking, the fan may be faulty. It must be repaired.

WARNING

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

PULL ON

右に回して、ロックを解除します。

ONのLEDが点灯します。

Turn to the right for unlocking.

ON LED lights.

Be sure to press the above switch to turn OFF the HV power for safety when the output wiring is changed.

Page 93

4.3 Operation example in constant current mode (load)

HVA4321

4-37

When either of the above is not applicable, the internal high voltage DC power supply may be faulty.

In this case, it must be repaired.

4.3.4 Signal output and adjustment

a) Using internal DC bias signal source

Make sure that the internal DC signal source dial is 0. Set the polarity switch to the desired polarity. Turn

ON the internal DC bias signal source ON/OFF switch and press ON of the SIGNAL switch. While

reading the value on the voltmeter or oscilloscope connected to the voltage monitor, turn the dial

gradually to the right. Set it to the desired voltage.

Figure4-47. Using internal DC bias signal

b) Using external oscillator

Connect the external oscillator to OSC INPUT and make sure that the oscillator output level is 0V. Set the

GAIN knob to UP. Turn ON the external oscillator ON/OFF switch and press ON of the SIGNAL switch.

While reading the value on the voltmeter or oscilloscope connected to the voltage monitor, increase the

output level of the oscillator gradually.

If fine adjustment of the output level is required, adjust it at the oscillator or adjust it with GAIN of the

unit. Turn GAIN to the left, the gain is decreased. Turn GAIN to the right, the gain is increased. The gain

can be adjusted in the range of approximately ±3%.

DC BIAS

0-10

OFF

SIGNAL

OFF

0にする。

極性を選ぶ。

ONにする。

希望のレベルに調整する。

DC BIAS

0-10

Set to 0

Select polarity

Turn ON

Press ON

Adjust it to the

desired level.

Page 94

4.3 Operation example in constant current mode (load)

HVA4321

4-38

Figure4-48. Using external oscillator

c) Using external DC bias signal source

Connect the DC standard power supply to EXT DC BIAS INPUT and make sure that the output of the

standard power supply is 0V. Turn ON the external DC bias ON/OFF switch and press ON of the SIGNAL

switch.

While reading the value on the voltmeter or oscilloscope connected to the voltage monitor, increase the

output level of the DC standard power supply gradually and set the desired voltage.

Figure4-49. Using external DC bias signal

 High voltage display

When the output voltage exceeds ±130V to ±150V, the high voltage output LED lights and starts

rotation slowly. The higher the output voltage is, the faster the rotation is.

When the voltage exceeds ±4.9 kV, the color changes from orange to red.

 Gain adjustment with RESPONSE

The gain of the 200 Hz band or more may vary depending on the RESPONSE knob position. Refer to

"5.3 Characteristics in constant voltage mode, Chapter 5".

When the frequency is used at 200 Hz or more, measure the output voltage of the voltage monitor and

adjust RESPONSE so that the desired amplitude may be obtained.

OFF

SIGNAL

OFF

0にする。

極性を選ぶ。

ONにする。

希望のレベルに調整する。

NORMAL

INVER

GAIN

真上にする。

GAIN

微調整する。

Set to 0

Select polarity Turn ON

Press ON

Adjust it to the

desired level.

Make fine

adjustment

Set to TOP

Oscillator

OFF

SIGNAL

OFF

0にする。

ONにする。

希望のレベルに調整する。

Set to 0

Turn ON

Press ON

Adjust it to the

desired level.

Page 95

4.3 Operation example in constant current mode (load)

HVA4321

4-39

！

It is very dangerous during output of high voltage. Never touch the output cable or the high voltage area.

If you find a dangerous status due to a unit error or load error, turn OFF the power switch immediately.

4.3.5 Signal OFF

a) Input signal OFF

To set the output signal to 0V temporarily, press OFF of the SIGNAL switch.

When SIGNAL is OFF, the output voltage is 0V, but the internal high voltage DC power supply is ON. It

continuously gives high voltage output.

In this status, never touch the output cable or the high voltage area for safety.

b) Internal high voltage DC power supply OFF

When the HIGH VOLTAGE POWER SUPPLY switch is turned OFF, the output of the internal high

voltage DC power supply is 0V and the amplifier cannot give high voltage output.

WARNING

Page 96

4.4 Operation example in constant current + constant voltage mode

HVA4321

4-40

4.4 Operation example in constant current + constant voltage mode

This section describes operation example of this unit in constant current + constant voltage mode.

In this mode, AC signal is constant current and DC signal is constant voltage. This mode is used to run AC

by applying DC bias to capacity load.

In constant current mode, total mode and load mode previously described can be selected.

The frequency at the boundary of the constant voltage operation and the constant current operation varies depending on the load capacity. Refer to "3.2.1 Amplifier operation mode, Chapter 3" and "Figure5.4 and Figure5-12, 5.4, Chapter 5".

The TOTAL terminal of OUTPUT Lo is connected to the casing. Therefore, the total mode can be used for grounded load or load that can be grounded.

In load mode, leak current with stray capacitance and load current are detected from different routes. Therefore, load mode cannot be used for load which is grounded.

Constant current operation is available for AC signal and constant voltage operation is available for DC signal. When the signal is ON, unusual voltage output is not given with the output open. When the output is short-circuited, be careful for DC short-circuit current.

！

CAUTION

！

CAUTION

Page 97

4.4 Operation example in constant current + constant voltage mode

HVA4321

4-41

Figure4-50. Constant current constant voltage mode (total mode)

Figure4-51. Constant current constant voltage mode (load mode)

In constant current + constant voltage mode, the current detection circuit detects AC components and the

voltage detection circuit detects DC components for independent control.

Total mode and load mode can be used same as normal constant current mode.

内部容量

出力端子

配線の容量

負荷抵抗

電流検出抵抗

（トータル用）

（ロード用）

電流モニタ

OUTPUT Hi

OUTPUT Lo

TOTAL

LOAD

Iout

Ii nt

Istr

Il oad

Iamp

Iac

Idc

電圧モニタ

Output terminal

Load

resistance

Wire capacit

Current detection

resistance

(

for total

)

Current monitor

Voltage monitor

Current detection resistance (for load)

Internal capacit

内部容量

出力端子

配線の容量

負荷抵抗

電流検出抵抗

（トータル用）

（ロード用）

電流モニタ

OUTPUT Hi

OUTPUT Lo

TOTAL

LOAD

Iout

Ii nt

Istr

Il oad

Iamp

Idc+Iac

電圧モニタ

Output terminal

Load

resistance

Wire capacit

Current detection

resistance

(

for total

)

Current monitor

Voltage monitor

Current detection resistance (for load)

Internal capacit

Page 98

4.4 Operation example in constant current + constant voltage mode

HVA4321

4-42

4.4.1 Panel setting

a) Internal high voltage DC power supply OFF

When HIGH VOLTAGE POWER SUPPLY switch is not OFF, press the button until a "click" sound is

heard. When a click sound is heard, the switch is locked in OFF status. The internal high voltage DC

power supply is always OFF.

Figure4-52. Internal high voltage DC power OFF

b) Signal system OFF

Turn the internal DC bias knob to the leftmost position to minimize the value. Turn OFF the switches of

DC BIAS, OSC INPUT and EXT DC BIAS INPUT.

Figure4-53. Switch settings

DC BIAS

0-10

OFF

INVERT

NORMAL

GAIN

HIGHVOLTAGE

POWER SUPPLY

PUSH OFF

OFF

危険防止のため、出力の配線を変更するときは必ず上のスイッチを押してＨＶ電源をＯＦＦしてください。

PULL ON

カチッと音がするまで押します。

ロックされた状態

オフ

オン

側面より

From side

OFF Locked status

Press the switch until a click sound is heard.

Page 99

4.4 Operation example in constant current + constant voltage mode

HVA4321

4-43

c) Output mode settings

Set the output mode switch to CC. Set the DC BIAS to CV.

Figure4-54. Output mode settings

d) Remote/local settings

To operate this unit from the panel, set the ON/OFF CONTROL switch to LOCAL.Refer to "4.6 Remote

control operation" for remote control operation.

Figure4-55. Local settings

OVERLOAD

1kV/1V

1mA/1V

DC BIAS

1kV/1V

1mA/1V

CURRENT

SELECT

LOAD

TOTAL

ON/OFF

CONTROL

REMOTE

LOCAL

OFF

EXT DC BI AS

OUTPUT

TTL(Lo:ON) Zout 10k

SIGNAL ON/OFF STATUS

OUTPUT

MONITOR

1V/ 1kV

Zout 50

VOLTAGE

CURRENT

10V MAX

Zi n 10 k

1V/1mA

Zout 50

Page 100

4.4 Operation example in constant current + constant voltage mode

HVA4321

4-44

e) Output limiter settings

To limit the output voltage and output current, set the limiter level as required.

Figure4-56. Limiter settings

 Voltage limiter

The voltage limiter function can limit the maximum value of the output voltage independently for

positive and negative values in the range from ±5 kV to ±10 kV.

For example, the output is sufficient up to ±8 kV, set the VOLTAGE LIMITER to 8 kV and -8 kV.

When voltage limitation is not required, set it to MAX.

 Current limiter

The current limiter function can limit the average value of the output current in the range from 0 mA to

±10 mA.

For example, to limit the output current up to 5 mA, set it to 5 mA.

When current limitation is not required, set it to 10 mA which is turned to the rightmost position.

 LIMIT/TRIP

Set the protection mode for activation of the current limiter. When LIMIT is selected, current is limited

to the set current. When TRIP is selected, the input signal is immediately OFF for activation of the

current limiter circuit and the output is 0V.

Select either one as required.

f) Current monitor mode settings

In total mode, set it to TOTAL CURRENT. In load mode, set it to LOAD CURRENT.

Figure4-57. Current monitor mode settings

TRIP

VOLTAGE(kV)

-5

-10

MAX

LI MIT

DC CURRENT( mA)

LI MITER

CURRENT

SELECT

LOAD

TOTAL