PVP-Series High-Voltage DC Power Supply

1. Important Basic Information

1.1 Standard Scope of Delivery

• Precision high-voltage PVP-Series power supply unit
• Accessories
• Mains connection line, 6.6 ft (2 m), with IEC socket
• Berkeley Nucleonics high-voltage cable with HV plug, cable length 9.8 ft (3 m)
• Plug for I/O terminal with integrated interlocking bridge
• PVP-Series Short Guide

1.2 Legal Notes

Liability, Warranty, Guarantee

Berkeley Nucleonics Corporation shall not be held liable for damage resulting from improper use of the products, from incorrect programming, or from failure to observe the operating instructions in whole or in part.

Berkeley Nucleonics Corporation provides a two-year warranty against manufacturing and material defects, effective as of the date of delivery of the product to the customer. The warranty requires the exclusive use of genuine Berkeley Nucleonics accessories, such as connectors and cables. For details on the manufacturer's warranty, please refer to the terms of the agreement.

1.3 Owner's Responsibilities

The owner is responsible for ensuring that the power supply unit:

• is only used in accordance with its intended use,
• is set up and installed as specified (refer to chapter 5, Set-up and Start-up),
• is only operated by trained technicians.

1.4 What You Need to Know About This User Manual

User Manual as Part of the Device

• This user manual must be observed and applies only to precision high-voltage power supply units from the PVP-Series.
• Please keep the user manual available at the device.
• Please pass the user manual on to the next user or users.

Pictograms

1.5 Significance of the User Manual

Please note that:

• The user manual is part of the product.
• The user manual should be retained for the entire service life of the product and updated where applicable.
• The user manual must be passed on to the next owner or user of the product.

2. Safety

2.1 Safety Symbols on the Device

2.2 Safety Symbols in This Manual

2.3 Basic Safety Instructions

Device

For safety reasons, the device may not be opened under any circumstances. The warranty is also voided if any modifications are made to the device or if the device is opened.

Range of Use and User Manual

The device is designed for use in laboratories and production applications. Personnel must follow the instructions in the user manual. For this reason, it should be kept near the device at all times.

Requirements for Personnel

This device may only be used and placed into service by qualified technicians.

2.4 Intended Use

Safety, reliability, and performance can only be guaranteed if:

• the device is used for its intended purpose,
• upgrades, modifications, and repairs are performed exclusively by persons authorized by the manufacturer,
• the electrical installations comply with the applicable safety regulations,
• and the connecting and operating conditions prescribed in this user manual are observed.

2.5 Residual Risk and Precautions

The high-voltage power supply unit of the PVP-Series is delivered in perfect working condition. It creates radio interference (threshold values according to EN 61000-6-4, class B) when in operation. The operator is personally responsible for compliance with the specific safety regulations relating to a connected application.

There is a risk of electrical shock when starting, operating, or shutting down the high-voltage power supply unit, especially if:

• the output voltage is switched on although no load is connected to the HV output as directed,
• the device is operated in spite of a known defect,
• the connected application represents a violation of the applicable electro-technical safety regulations,
• the device has been switched off and there is dangerous voltage at the output due to external or internal residual charges,
• the instructions in this user manual were not fully observed.

The specific safety measures for the device are described in the following chapters.

3. Technical Specifications

The precision high-voltage power supplies of the Berkeley Nucleonics PVP-Series are fully digitally regulated primary switching power supplies. A microcontroller and FPGA manage all regulation and monitoring. Active power factor correction keeps the units highly efficient and holds reverse transfer to the mains extremely low.

General

Voltage stabilization

Current stabilization

Models and type designation

Each model carries the designation PVP-<nominal voltage>-<nominal current>. The order reference (part number) maps one to one to the source manufacturer for procurement.

4. Design and Function

Working principle and functional description

The precision high-voltage power supplies of the Berkeley Nucleonics PVP-Series are fully digitally regulated primary switching power supplies. Active power factor correction makes the power input highly efficient and holds reverse transfer to the mains extremely low. The input voltage is rectified and smoothed, then converted to high-frequency AC by a full bridge. A high-voltage transformer steps the voltage up, and the result is rectified and smoothed into a stable DC output.

Depending on the connected load, the unit operates as a constant-voltage or constant-current source, and the switch between regulation modes is automatic. Nominal values can be set at the front-panel display or over the Ethernet or RS232 interface, and the high voltage is enabled the same way. The units are short-circuit proof. The high-voltage output is safe to touch and flashover-safe, even when unplugged. PVP-Series units can be supplied with options such as arc detection and ramp control.

Output characteristics

The PVP-Series supplies either continuous output voltage or continuous output current. In continuous operation it presents rectangular current-voltage output characteristics.

Regulation works by comparing actual and nominal values for current and voltage. When the load resistance is below the ratio of the nominal values, the current is regulated and the voltage is limited. When the load resistance is at or above that ratio, the voltage is regulated and the current is limited. The active control mode is shown on the front-panel display.

The output current is limited to the set nominal value I_REF. During a short circuit a peak current can reach up to 500 times the nominal current I_NOM and then drops exponentially toward I_REF according to the output capacitance. The high-voltage output is fully short-circuit resistant.

Safety concept

PVP-Series units may only be started and operated by qualified technicians. The following safety features are built in:

• The output voltage is not enabled by the power switch. The operator must press the HV button to apply high voltage to the output. The one exception is the power-on RESTORE function. When high voltage is active, the display shows a red HV indicator with the text "HV on".
• The output can be switched off remotely through the digital interfaces and the I/O terminal.
• The power input and the HV output are marked with warning symbols.

5. Set-Up and Start-Up

5.1. Set-Up

Special safety instructions for set-up

When selecting a location for setting up the device, take care to provide the ambient conditions specified in this manual (see section 3). Avoid excessive ambient temperature (Ta max. = 104 degrees F / 40 degrees C), excessive humidity (RH max. = 70 percent), and excessive dust or dirt build-up near the unit (max. pollution degree 2), as these may damage or impair the performance of the device.

Unpacking the power supply unit

Please proceed as follows:

1. Check for visible damage to the packaging or the unit caused during shipping.
2. Check the delivery for completeness (see section 1, Important basic information).
3. Carefully set up the unit at the desired location (see section 5.1).
4. The device can be installed directly in a 19-inch cabinet. The PVP-Series unit can also be used as a tabletop unit.

Using the PVP-Series unit as a tabletop unit

The PVP-Series unit can be used as a tabletop unit with a simple piece of conversion work.

5.2. Start-Up

Special safety instructions for initial start-up

Connecting the unit

Please follow these steps:

1. Set the power switch to OFF.
2. Connect the unit to mains power using the power cord supplied with the unit.
3. Connect the load using the OEM HV connector (as supplied) and the attached HV cable. The HV cable's inner conductor carries the high voltage, while the cable shielding acts as the return conductor and is connected to the earth potential in the unit.
4. If desired, connect the I/O terminal using the 20-pin plug (supplied) as required (see section 6.5, Controlling the unit via I/O terminal).

Checks and tests

1. Press the power switch on the back of the device. The device starts up and displays the main menu once complete.
2. Use the "Control Mode" menu to select "Front panel" (set as standard).
3. Set the voltage to 0 on the rotary encoder.
4. Turn the current to approximately 10 percent of INOM on the rotary encoder.
5. For devices with the "ARC detection" option: reset the flashover cut-off via the menu.
6. For devices with the "Reverse polarity" option: set the required output polarity.
7. If errors or warnings are displayed, bring up the "Info / Event" menu and remedy the errors.
8. Press the HV button in the main menu. The HV indicator is displayed in red, along with the text "HV on".
9. Increase the voltage on the rotary encoder and check whether the instrument display for voltage rises to the connected output load value.

Switching off the power supply unit

1. Recommended: switch the HV output off using the HV button so that the load circuit can also discharge. Monitor via the indicator.
2. Use the power switch to switch the unit off. The screen will switch off.

6. Operation

6.1. Special safety instructions for operation

6.2. Controls and Indicators

Controls

Indicators

The front-panel HMI display lets you view the individual menus and their settings. The layout of the display is shown below.

Device connections

6.3. Operating the Device

HV output

The PVP-Series unit features a Berkeley Nucleonics HV output socket designed for the maximum device output voltage. The accompanying plug with pre-installed HV cable (made by Berkeley Nucleonics) is included with the unit. This cable is to be used to connect a load before every switch-on with the appropriate HV plug. The original Berkeley Nucleonics HV cable must be used to connect a load. The HV output is short-circuit resistant.

Output characteristic curve, HV output

Based on the output load, the following operating modes are set:

Short circuit

The output current is limited to the set nominal value IREF. A peak current of IP occurs during a short circuit. This may be up to 500 times the unit's nominal current INOM and drops exponentially to IREF according to the output capacity. The HV output is fully short-circuit resistant.

Structure of the HMI main menu

The HMI is the main control unit for the PVP-Series unit. From here you can use all of the integrated functions and implement all available settings.

The main menu shows the actual values for voltage and current. The two control fields allow you to access the "Set Voltage/Current" menu.

The HV field is visible. It is blue and marked "HV off" if the HV output is not active. If the output is switched on, the HV field is red and marked "HV on".

If the HV output is switched off, the function button takes you to the "Settings" menu. If the HV output is switched on, the function button takes you directly to the "Info / Event" menu so that you can view status messages.

All other settings menus are reached from the "Settings" menu; their functions are described below. Some menus can only be selected if the corresponding options are integrated.

"Set Voltage/Current" menu

This menu shows the actual values (indicator fields) and nominal values (control fields) for current and voltage. You can set the current and voltage using the control fields. The HV field is active and can be used.

If a control field is selected, you can use the function button to switch between "Fine" and "Coarse". Otherwise, you can use the function button marked "Back" to return to the main menu.

"OVP/OCP" menu

This menu shows the current set values for the overvoltage and overcurrent protection (control fields). The values apply to both positive and negative polarity. The values can be set by selecting the two control fields. They must be no more than 1 percent over the device-specific maximum values UNOM and INOM.

If a control field is selected, you can use the function button to switch between "Fine" and "Coarse". Otherwise, use the function button marked "Back" to return to the "Settings" menu. The HV field is not active and cannot be used.

"Limit V/C" menu

This menu shows the current limit values for the adjustable current and voltage (control fields). This limits the adjustable nominal values on the device. The set values continue to apply when the polarity is switched. The values can be set by selecting the two control fields. They must be no more than the device-specific maximum values UNOM and INOM.

If a control field is selected, you can use the function button to switch between "Fine" and "Coarse". Otherwise, use the function button marked "Back" to return to the "Settings" menu. The HV field is not active and cannot be used.

"Ramp" menu (option)

This menu shows the current set value for the voltage ramp, as well as whether the "voltage ramping" option is active (control fields). The value range for voltage ramping is between 1 and 10 times UNOM.

Use the upper field to switch the option between active and inactive. If the lower control field is selected, you can use the function button to switch between "Fine" and "Coarse". Otherwise, use the function button marked "Back" to return to the "Settings" menu. The HV field is not active and cannot be used.

"ARC Detection" menu (option)

This menu shows whether the "ARC detection" option is active and which mode is selected (control fields). Use the upper field to switch the option between active and inactive. Use the lower control fields to choose between "ARC detection with warning" and "ARC detection with warning and switch-off of the HV output" (see the device options section).

The function button returns you to the "Settings" menu. The HV field is not active and cannot be used.

"Control Mode" menu

This menu shows the PVP-Series unit's control interfaces and which is selected as the bus master (control fields). The bus master has control; all other interfaces have read access only. The bus master can only ever be set through the HMI, even if the HMI itself is not the bus master.

The control fields allow you to choose between the HMI, RS232, and Ethernet interfaces. The function button returns you to the "Settings" menu. The HV field is not active and cannot be used.

"Interface" menu

This menu shows the interface data for "IP address", "Port", "Subnet mask", "Gateway address", "Ethernet Timeout" (Ethernet), and baud rate (RS232) in control fields, plus the unique MAC address (indicator field). The "Ethernet Timeout" can be set from 1 to 600 s. You can use the control fields to adjust the values accordingly.

The function button returns you to the "Settings" menu. The HV field is not active and cannot be used.

"Setup" menu

This menu shows the current status of various functions and options (control fields). Options that are not integrated into the device are shown only through indicator fields. The following settings can be implemented:

The function button returns you to the "Settings" menu. The HV field is not active and cannot be used.

"Code" menu

This menu shows which menus are protected against unauthorised use by means of a PIN (control fields), and provides two control fields through which the current PIN can be entered or a new PIN set.

The menus to be protected are set using the right-hand control fields. The selection is confirmed by entering the PIN:

1. Select the "PIN Code" field. A window for entering the PIN appears.
2. Turn the rotary encoder to select the position in the four-digit PIN.
3. While pressing the rotary encoder, turn it to change the value at the selected position.
4. Press the "Back" function button to confirm the PIN entry.

If the correct PIN has been entered, the message "Pin OK" appears in the bottom section of the display. Otherwise the message "Wrong Pin" appears.

To enter a new PIN, select the "new PIN code" field. A window for entering the new PIN appears. The current PIN is entered in the upper control field, the new PIN in the lower field. Press the rotary encoder twice to leave a control field. Use the function button to close the window and confirm the entry.

The function button returns you to the "Settings" menu. The HV field is not active and cannot be used.

"Identification" menu

This menu shows the device-specific data for "Serial number", "Item number", "PVP-Series firmware version", and "System runtime" (indicator fields). The menu also provides a control field for accessing the "SW/HW packages" sub-menu. The function button returns you to the "Settings" menu. The HV field is not active and cannot be used.

"SW/HW packages" sub-menu

This menu shows the hardware and software versions of each of the individual components of the device (indicator fields). The function button returns you to the "Identification" menu. The HV field is not active and cannot be used.

"Info / Event" menu

This menu shows current messages about the device status. Active error messages are displayed in red, warnings in yellow, and status messages in blue. The menu also provides a control field for resetting all messages ("Quit Error"). An interlock will remain in place if the reason for it persists. Another control field allows you to access the "Error History" sub-menu.

The HV field is active and the HV output can be controlled. If the HV output is active, the two control fields cannot be selected, and the function button takes you directly to the main menu. If the HV output is not active, the function button takes you back to the "Settings" menu.

"Error History" sub-menu

The "Error History" shows internal device event codes with IDs and time stamps, intended for servicing. The function button returns you to the "Info / Event" menu. The HV field is not active and cannot be used.

6.4. Monitoring and Controlling the Unit via Web Server

The device offers a web server interface that can be reached through a browser and the IP address of the device, entered into the browser address bar, when on the same network. The following screen is presented:

Every framed field is a button used to make settings or to reach menus. Settings can only be made if the bus master "Ethernet HTTP" is set.

General Control

Settings of voltage and current can be made in the empty fields on the left side of the screen. The actual values are shown on the right side. The same applies to the limit and protection settings of voltage and current.

Device status

The "SYS-OK(FAIL)" button opens the device status menu, where errors are also shown. If the device has failed, the errors can be cleared via the "Quit Errors" button once they are fixed. Example shown for a PVP-1500-1400 rev unit.

6.5. Controlling the Unit via I/O Terminal

The following device functions and information are available externally via the I/O terminal:

• Interlock function
• Read-out of ARC detection ("ARC Detection" option)
• Read-out of HV output ("HV on" and "HV off")
• Control of HV output

Pin assignment (20-pin plug)

Wiring suggestion

Timing

The switch must be operated for a minimum of 250 ms to trigger toggling of the HV output. If the switch is released within 250 ms, the signal is ignored. For recognition of the signal, the maximum operation time of the switch is 1.75 s. The signal is ignored if the switch is operated for more than 1.75 s.

7. Device Options

7.1 General Information

Berkeley Nucleonics PVP-Series power supply units can be supplied with various options. The options described below can be retrofitted at the customer's site.

7.2 Description of Device Options

Option: "ARC detection"

This option facilitates the detection of flashovers in the output voltage, which the device can report and, if desired, can also use to switch off the output voltage. ARC detection is triggered under the following conditions:

• du ≥ 10% UNOM (change in output voltage or spike pulses)
• dt ≤ 100 ms

This option can be retrofitted at the customer's site.

Option: "Ramp control"

This option facilitates controlled upward and downward regulation of the output voltage with an adjustable gradient. The adjustable range lies between 1 V/s and 10 · UNOM V/s. This option can be retrofitted at the customer's site.

8. Digital Interface Specifications

8.1 General Information

The digital interface described here forms an intelligent interface with a PC in order to facilitate setting or read-out of device parameters. It has been specially designed for control tasks in measurement and power supply technology.

8.2 Technical Specifications

Digital interfaces:

• RS232
• Ethernet (TCP/IP)

The communication channels for Ethernet and RS232 can be used in parallel.

• Ethernet insulation voltage: 1.5 kV_RMS
• RS232 insulation voltage: 2.5 kV_RMS
• The control command set is based on IEC 60488-2, Standard digital interface for programmable instrumentation, Part 2: Codes, formats, protocols and common commands (SCPI).

RS232

Ethernet

8.3 Time Response

• SCPI commands via Ethernet must not be sent faster than 4 ms.
• SCPI commands via RS232 must not be sent faster than 16 ms.
• SCPI commands sent simultaneously via Ethernet and RS232 must not be sent faster than 4 ms via Ethernet and 20 ms via RS232.

The hardware reaction time must also be taken into account, for example when setting the voltage or the current, the voltage switch-on and switch-off, or the polarity. Real-time capability is not possible due to the interface standards used. The period between dispatch of the command from the PC to the digital interface and achievement of a settled device status is defined as follows:

t_execution_time = t_PC_processing_time + t_transmission_time_for_command + t_DAC

Depending on the overall set-up, t_{execution time} is at least approximately 15 ms, to which a model-dependent device settlement time still needs to be added.

8.4 Configuration of the RS232 Connecting Cable

The RS232 connecting cable is wired as a null-modem (crossover) cable between the device 9-pin D-sub connector and the PC. Use a shielded cable with the shield bonded to device earth. The pin assignment is as follows:

9. Programming

The following describes the SCPI commands available for controlling the device. They apply regardless of the interface (Ethernet or RS232) that is used.

9.1 Communication over the ASCII Terminal

Communication with the device may take place from a PC, for example through the program "PuTTY" (Ethernet, RS232).

When connecting via RS232, the corresponding serial port to which the device is connected on the PC and the baud rate set on the device must be entered. It is recommended to set "Local echo" in the "Terminal" to "Force on" so that your own input is visible in the terminal window. Manually entered commands must be sent with Ctrl + J to append a Line Feed (LF character).

When connecting via Ethernet, the IP address and port of the device must be entered. The connection type must be set to "Raw".

9.2 SCPI Command Syntax

Unless described otherwise, the command sequences comprise ASCII characters in the range of 0x20 (32) to 0x7D (125) in the following format:

[Command]<if applicable [Space][Parameter]>[LF]

Example (the symbol « denotes the LF terminator, the symbol ␣ denotes a space):

*SRE?«
*SRE␣16«

Commands and Queries

In this document, the characters required for the commands are written in upper case. Lower case letters are optional and can be omitted. It must be ensured that the individual words of the command are conveyed either in their long format or in their short format.

VOLTage␣1000«
VOLT␣1000«
OUTPu:STAT?«        (generates: -100,"Command␣Error")
OUTPut:STATe?«
1«
OUTP:STATe?«
0«

A query is formed by appending a question mark (?) to the command keyword. The device returns the requested value followed by the LF terminator.

Parameters and Terminators

Each command sequence is closed with an LF character («). Each command sequence via Ethernet can also be closed with 0x00. There is generally a space between the command and a possible parameter (hex 0x20: " "). Once the command has been sent by the computer (PC) to the interface, it is executed immediately if another command is not already being executed.

If the entry of the command causes an error, no response is returned, but an error message is stored in the EMQ (cf. section 9.3.50).

Command Tree

Commands may also contain sub-commands, which are attached using the colon operator (:):

[Command]<if applicable [:][Command]…><if applicable [Space][Parameter]>[LF]

Example:

SAFE:VOLT:ARC:STAT␣1«

The colon operator must not be the first character. In addition, the root keyword SOURce is neither required, nor taken into account, nor accepted.

:MEAS:VOLT?«             -100,"Command␣Error"«
SOURce:VOLT␣1000«       -100,"Command␣Error"«

Case Sensitivity and Separators

The SCPI commands are not case-sensitive.

VOLTAGE␣1000«    sets voltage to 1 kV
VOltAGe␣1000«    sets voltage to 1 kV
voltage␣1000«    sets voltage to 1 kV
volT␣1000«       sets voltage to 1 kV

There may be up to 8 whitespaces (for example hex 0x0B, 0x20) at the start of a command without a "Cmd Error" being generated. The SCPI command separator (;) is not accepted. Commands must be entered line by line. There cannot be several commands in one line.

*RST;*IDN?«            (generates: -100,"Command␣Error")
VOLT␣1000;MEAS:VOLT?«  (generates: -100,"Command␣Error")

9.3 SCPI Commands

The following commands control the Berkeley Nucleonics PVP-Series high-voltage power supply over the digital interface. They apply regardless of the interface (Ethernet or RS232) that is used. Each command sequence is closed with an LF character. Commands are not case sensitive, and each keyword may be sent in its long or short form. Optional device functions may add further commands. Commands marked "(option)" are only available when the corresponding option is integrated; calling them otherwise triggers an execution error.

Common Commands

Output

Voltage

Measurement

Current

Status

System

9.4 Registers

The PVP-Series device implements four status registers, four matching enable registers, and the Error/Event Message Queue (EMQ). These are connected so that the four status registers each feed a summary bit into the Status Byte Register through their associated enable registers, while the EMQ contributes the Message Available bit.

Operation State Register

The Operation State Register (OSR) reports the current operating condition of the device. Each bit sets itself automatically based on the live operating status.

Relevant SCPI commands: STAT:OPER?, STAT:OPER:BIT[Value], STAT:OPER:ENAB [Value], STAT:OPER:ENAB?.

Event Status Register

The Event Status Register (ESR) reports events as they occur. Once an event sets a bit to '1', that bit stays at '1' until the ESR is read, the device is switched back on, or the SCPI commands *RST or *CLS are executed.

Relevant SCPI commands: *ESR?, *ESE [Value], *ESE?.

Questionable Status Register

The Questionable Status Register (QSR) reports current error statuses. The register bits reset automatically when the unit returns to error-free normal operation.

Relevant SCPI commands: STAT:QUES?, STAT:QUES:BIT[Value], STAT:QUES:ENAB [Value], STAT:QUES:ENAB?.

Error/Event Message Queue

The Error/Event Message Queue (EMQ) holds up to the ten most recent event and error messages. The messages implemented are listed below. SCPI-specific messages carry a '-' prefix.

Relevant SCPI command: SYST:ERR?.

Status Byte Register

The Status Byte Register (STB) summarises the information from the status registers and the EMQ, so the user can see at a glance whether relevant information is available. The enable registers select which information is reported (see Enable registers below). The MAV bit for the EMQ is always set whenever the EMQ is not empty.

The RQS bit is set when a bit is set in the STB and the same bit is also set in the Service Request Enable Register (see below). When RQS is set, the string '!RQS!' is appended to the system response.

Relevant SCPI commands: *STB?, *SRE [Value], *SRE?.

Enable registers

Each status register has an enable register with an identical structure. Any bit in a status register can drive the corresponding summary bit in the STB independently of the other bits, provided the matching bit is also set in the enable register. This lets the user select exactly which statuses are reported in the STB.

For the STB, the identically positioned bits of a register and its enable register are AND-linked, and all bit positions are then OR-linked to produce the summary bit. In other words, a summary bit in the STB is set whenever at least one enabled bit is active in the source register.

Service Request Enable Register

The Service Request Enable Register (SRE) is the enable register for the STB. It lets the user learn about an event or error without issuing a separate command to read a specific register or the STB. The string '!RQS!', separated by a ';', is appended to a system response as soon as a relevant event occurs, that is, an event selected through the enable register.

10. Malfunctions and Troubleshooting

10.1 Special safety instructions for troubleshooting

10.2 Service address

Service and repairs are carried out directly by Berkeley Nucleonics. Please contact:

10.3 Integrated fuses

The device is equipped with fuses on the mains side. If these fuses trip, it indicates a defect in the device. If this happens, please contact Berkeley Nucleonics rather than attempting a repair.

11. Service, Maintenance, Calibration, Spare Parts

11.1 General information

PVP-Series power supply units are largely maintenance-free. Please observe the instructions in this chapter to keep the unit operating within specification over its service life.

11.2 Cleaning and care

Depending on the ambient conditions, the device may accumulate dirt from circulating air or static charge. This can reduce the unit's capacity through overheating or leakage currents. Inspect the device at appropriate intervals and clean it where required. This work should be carried out by Berkeley Nucleonics Service.

11.3 Service and maintenance

The maintenance required depends heavily on the conditions under which the unit is operated. We recommend having the unit inspected and serviced at least every five years. This should be performed by the Berkeley Nucleonics service department.

11.4 Calibration

On request, Berkeley Nucleonics will calibrate the device in accordance with the applicable ISO 9000 quality management standard.

11.5 Spare parts

Order spare parts and accessories through Berkeley Nucleonics. Use only genuine parts to keep the warranty valid and to maintain rated safety and performance.

For PVP-Series 1.5 kV to 10 kV units

For PVP-Series 20 kV to 30 kV units

12. Declaration of Conformity

Berkeley Nucleonics Corporation declares, under its sole responsibility, that the high-voltage power supply units of the PVP-Series, to which this declaration relates, are designed and manufactured in conformity with the applicable directives and harmonized standards for safety, electromagnetic compatibility, and electrical equipment for measurement, control, and laboratory use.