B+K precision MR Series User manual

Safety Summary
The following safety precautions apply to both operating and maintenance personnel
and must be followed during all phases of operation, service, and repair of this
instrument.
Before applying power to this instrument:
Read and understand the safety and operational information in this manual.
Apply all the listed safety precautions.
Verify that the voltage selector at the line power cord input is set to the correct
line voltage. Operating the instrument at an incorrect line voltage will void the
warranty.
Make all connections to the instrument before applying power.
Do not operate the instrument in ways not specified by this manual or by B&K
Precision.
Failure to comply with these precautions or with warnings elsewhere in this manual
violates the safety standards of design, manufacture, and intended use of the
instrument. B&K Precision assumes no liability for acustomer’s failure to comply with
these requirements.
Category rating
The IEC 61010 standard defines safety category ratings that specify the amount of
electrical energy available and the voltage impulses that may occur on electrical
conductors associated with these category ratings.
The category rating is aRoman numeral of I, II, III, or IV. This rating is also
accompanied by amaximum voltage of the circuit to be tested, which defines the
voltage impulses expected and required insulation clearances. These categories are:
Category I(CAT I): Measurement instruments whose measurement inputs are not
intended to be connected to the mains supply. The voltages in the environment are
typically derived from alimited-energy transformer or abattery.
Category II (CAT II): Measurement instruments whose measurement inputs are meant
to be connected to the mains supply at astandard wall outlet or similar sources.
Example measurement environments are portable tools and household appliances.

Category III (CAT III): Measurement instruments whose measurement inputs are meant
to be connected to the mains installation of abuilding. Examples are measurements
inside abuilding's circuit breaker panel or the wiring of permanently-installed motors.
Category IV (CAT IV): Measurement instruments whose measurement inputs are
meant to be connected to the primary power entering abuilding or other outdoor
wiring.
Do not use this instrument in an electrical environment with ahigher category rating
than what is specified in this manual for this instrument.
You must ensure that each accessory you use with this instrument has acategory
rating equal to or higher than the instrument's category rating to maintain the
instrument's category rating. Failure to do so will lower the category rating of the
measuring system.

Electrical Power
This instrument is intended to be powered from aCATEGORY II mains power
environment. The mains power should be 120 VRMS or 240 VRMS. Use only the
power cord supplied with the instrument and ensure it is appropriate for your country
of use.
Ground the Instrument
To minimize shock hazard ,the instrument chassis and cabinet must be connected to an electrical
safety ground. This instrument is grounded throughthegroundconductorofthesupplied,three-
conductorACline power cable. The power cable must be plugged into an approved three-
conductor electrical outlet. The power jack and mating plug of the power cable meet
IEC safety standards.
Do not alter or defeat the ground connection. Without the safety ground connection, all
accessible conductive parts (including control knobs) may provide an electric shock.
Failure to use aproperly-grounded approved outlet and the recommended three-
conductor AC line power cable may result in injury or death.
Unless otherwise stated, a ground connection on the instrument's front or rear panel is for a
reference of potential only and is not to be used as asafety ground.
Do not operate in an explosive or flammable atmosphere
Do not operate the instrument in the presence of flammable gases or vapors, fumes, or finely-
divided particulates.
The instrument is designed to be used in office-type indoor environments. Do not operate the
instrument
In the presence of noxious, corrosive, or flammable fumes, gases, vapors, chemicals,
or finely-divided particulates.
In relative humidity conditions outside the instrument's specifications.

In environments where there is adanger of any liquid being spilled on the instrument
or where any liquid can condense on the instrument.
In air temperatures exceeding the specified operating temperatures.
In atmospheric pressures outside the specified altitude limits or where the surrounding
gas is not air.
In environments with restricted cooling air flow, even if the air temperatures are within
specifications.
In direct sunlight.
This instrument is intended to be used in an indoor pollution degree 2environment.
The operating temperature range is 0°C to 40 °C and the operating humidity 90%
relative humidity with no condensation allowed.
Measurements made by this instrument may be outside specifications if the instrument
is used in non-office-type environments. Such environments may include rapid
temperature or humidity changes, sunlight, vibration and/or mechanical shocks, acoustic
noise, electrical noise, strong electric fields, or strong magnetic fields.
Do not operate instrument if damaged
If the instrument is damaged, appears to be damaged,orifanyliquid,chemical,orother
materialgetsonorinside the instrument, remove the instrument's power cord, remove the
instrumentfrom service,label itasnotto beoperated,andreturn the instrument to B&K
Precision for repair. Notify B&K Precision of the nature of any contamination of the instrument.
Clean the instrument only as instructed
Donotcleantheinstrument,itsswitches,oritsterminalswithcontact cleaners, abrasives,
lubricants, solvents, acids/bases, or other such chemicals.Cleantheinstrumentonlywitha
cleandrylint-freeclothor as instructed in this manual.
Not for critical applications

This instrument is not authorized for use in contact with the human body or for use
as acomponent in alife-support device or system.
Do not touch live circuits
Instrument covers must not be removed by operating personnel. Component
replacement and internal adjustments must be made by qualified service-trained
maintenance personnel who are aware of the hazards involved when the instrument's
covers and shields are removed. Under certain conditions, even with the power cord
removed, dangerous voltages may exist when the covers are removed. To avoid
injuries, always disconnect the power cord from the instrument, disconnect all other
connections (for example, test leads, computer interface cables, etc.), discharge all
circuits, and verify there are no hazardous voltages present on any conductors by
measurements with aproperly-operating voltage-sensing device before touching any
internal parts. Verify the voltage-sensing device is working properly before and after
making the measurements by testing with known-operating voltage sources and test for
both DC and AC voltages. Do not attempt any service or adjustment unless another
person capable of rendering first aid and resuscitation is present.
Do not insert any object into an instrument's ventilation openings or other openings.
Hazardous voltages may be present in unexpected locations in circuitry being tested
when afault condition in the circuit exists.
Fuse replacement
Fuse replacement must be done by qualified service-trained maintenance personnel
who are aware of the instrument's fuse requirements and safe replacement procedures.
Disconnect the instrument from the power line before replacing fuses. Replace fuses
only with new fuses of the fuse types, voltage ratings, and current ratings specified in
this manual or on the back of the instrument. Failure to do so may damage the instrument, lead
to asafety hazard, or cause a fire. Failure to use the specified fuses will void the warranty.
Servicing

Do not substitute parts that are not approved by B&K Precision or modify this
instrument. Return the instrument to B&K Precision for service and repair to ensure
that safety and performance features are maintained.
Cooling fans
This instrument contains one or more cooling fans. For continued safe operation of the
instrument, the air inlet and exhaust openings for these fans must not be blocked nor
must accumulated dust or other debris be allowed to reduce air flow. Maintain at least
25 mm clearance around the sides of the instrument that contain air inlet and exhaust
ports. If mounted in arack, position power devices in the rack above the instrument
to minimize instrument heating while rack mounted. Do not continue to operate the
instrument if you cannot verify the fan is operating (note some fans may have
intermittent duty cycles). Do not insert any object into the fan's inlet or outlet.
Use correctly sized wires
To connect aload to the power supply, use awire diameter large enough to handle
the maximum continuous output short-circuit current of the power supply without the
wire overheating.
For continued safe use of the instrument
Do not place heavy objects on the instrument.
Do not obstruct cooling air flow to the instrument.
Do not place ahot soldering iron on the instrument.
Do not pull the instrument with the power cord, connected probe, or connected test
lead.
Do not move the instrument when aprobe is connected to acircuit being tested.

Compliance Statements
Disposal of Old Electrical &Electronic Equipment (Applicable in the European Union
and other European countries with separate collection systems) This product is subject
to Directive 2002/96/EC of the European Parliament and the Council of the European
Union on waste electrical and electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put on the market after August 13, 2005,
and should not be disposed of as unsorted municipal waste. Please utilize your local
WEEE collection facilities in the disposition of this product andotherwise observe all
applicable requirements.

CE Declaration of Conformity
This instrument meets the requirements of 2006/95/EC Low Voltage Directive and 2004/108/EC
Electromagnetic Compatibility Directive with the following standards.
Low Voltage Directive
UL 61010-1:2012
EMC Directive
EN 55011:2009+A2:2010
EN 61000-3-11: 2000
EN 61000-3-12: 2011
EN 61000-4-2 /-3 /-4 /-5 /-6 /-8 /-34
EN 61326-1: 2013
EN 61326-2-1: 2013

Safety Symbols
Refer to the user manual for warning information to avoid hazard or
personal injury and prevent damage to instrument.
Electric Shock hazard
On (Supply). This is the AC supply connect/disconnect switch on the
front of the instrument.
Off (Supply). This is the AC mains connect/disconnect switch on the
front of the instrument.
Direct current
Alternating current
Fuse Symbol
Chassis (earth ground) symbol
Ground terminal
Protective earth ground
CAUTION indicates ahazardous situation which, if not avoided, will
result in minor or moderate injury
WARNING indicates ahazardous situation which, if not avoided, could
result in death or serious injury
DANGER indicates ahazardous situation which, if not avoided, will
result in death or serious injury.

Table of Contents
Safety Summary................................................................................................................1
Category rating ........................................................................................................................... 1
Compliance Statements.........................................................................................................7
CE Declaration of Conformity...............................................................................................8
Low Voltage Directive................................................................................................................ 8
EMC Directive ............................................................................................................................. 8
Safety Symbols......................................................................................................................9
Table ofContents.................................................................................................................10
1GeneralInformation.......................................................................................................13
1.1 Features:.......................................................................................................................... 13
1.2 Package Contents............................................................................................................. 13
1.3 Product Dimensions .......................................................................................................... 14
1.4 Front Panel Overview .................................................................................................... 15
1.4.1 Front Panel Description.................................................................................... 16
1.5 Keypad Overview ............................................................................................................. 16
1.5.1 Keypad Description ........................................................................................... 16
1.6 Rear PanelOverview........................................................................................................ 18
1.6.1 Rear Panel Description..................................................................................... 18
1.7 Display Overview ............................................................................................................. 19
1.7.1 Display Description............................................................................................ 19
2GettingStarted ..............................................................................................................20
2.1 InputPowerandFuseRequirements ................................................................................. 20
2.1.1 Input Power....................................................................................................... 20
2.1.2 Fuse Replacement ............................................................................................. 23
2.2 RackmountInstallation .................................................................................................... 23
2.3 Output Connections ........................................................................................................ 23
2.4 Preliminary Check ............................................................................................................ 24
2.4.1 Warm-up Time .................................................................................................. 25
2.4.2 Output Check..................................................................................................... 25
2.4.3 Check Model and Firmware Version .............................................................. 26
3Front Panel Operation ...................................................................................................28

3.1 Menu Options................................................................................................................. 28
3.1.1 Menu Tree.......................................................................................................... 29
3.1.2 How to Access the Menu................................................................................ 29
3.2 ConfigureVoltage/CurrentOutput ................................................................................... 30
3.2.1 Setting Voltage .................................................................................................. 30
3.2.2 Setting Current .................................................................................................. 31
3.2.3 Remote Sense.................................................................................................... 31
3.3 Voltage/CurrentMeasurement........................................................................................ 33
3.4 CONFIGMenu................................................................................................................... 34
3.4.1 Output Limit Settings........................................................................................ 34
3.4.2 Protection Settings............................................................................................ 35
3.4.3 Configure Over Power Protection (OPP) .................................................................. 36
3.4.4 External Analog Control.................................................................................... 38
3.4.5 External Control Setting ................................................................................... 40
3.4.6 Enable Control................................................................................................... 41
3.4.7 Power OK Signal ............................................................................................... 41
3.5 Voltage Program............................................................................................................. 43
3.5.1 Voltage Mode.................................................................................................... 43
3.5.2 Resistor Mode ................................................................................................... 43
3.6 Parallel Operation........................................................................................................... 46
3.6.1 Master Unit ....................................................................................................... 48
3.7 PV Simulation................................................................................................................... 50
3.8 Power-OnState ................................................................................................................ 52
3.9 Communication Configuration ........................................................................................ 52
3.10 SYSTEM Menu.................................................................................................................. 52
3.10.1 Enable/Disable Key Sound ............................................................................... 52
3.10.2 Error Log ............................................................................................................ 53
3.10.3 Restore Factory Default Settings .................................................................... 54
3.11 Save/Recall InstrumentSettings...................................................................................... 57
3.11.1 Save Settings..................................................................................................... 57
3.11.2 Recall Settings................................................................................................... 57
3.12 Program Function ............................................................................................................ 58
3.12.1 Configure Program Parameters ....................................................................... 58
3.13 Timer Function................................................................................................................. 61
3.14 Slew RateSetting............................................................................................................. 62
4Remote Operation ........................................................................................................63
4.1 InterfaceConfiguration.................................................................................................... 63
4.1.1 USB ..................................................................................................................... 63
4.1.2 USBVCP:.............................................................................................................. 64

4.1.3 USBTMC:............................................................................................................. 64
4.1.4 RS232.................................................................................................................. 64
4.1.5 GPIB.................................................................................................................... 65
4.1.6 RS485.................................................................................................................. 66
4.1.7 LAN (Ethernet)................................................................................................... 68
4.1.8 Web server ........................................................................................................ 69
4.2 Error/Event List............................................................................................................... 72
5Calibration.....................................................................................................................73
5.1 Voltage Calibration ......................................................................................................... 74
5.2 Current Calibration .......................................................................................................... 75
5.3 OVP Calibration................................................................................................................ 75
5.4 OCP Calibration................................................................................................................ 76
5.5 External VoltageProgramming Calibration ......................................................................... 77
5.6 ExternalCurrentProgramming Calibration........................................................................... 78
5.7 CC Calibration of External Voltage............................................................................... 78
5.8 CC Calibrationof External Current................................................................................. 79
6TroubleshootingGuide ...................................................................................................81
6.1 General ............................................................................................................................ 82
7SERVICE INFORMATION ................................................................................................83

1General Information
B&K Precision models MR25080, MR50040, and MR100020 are high voltage programmable DC
power supplies with single outputs that offer the maximum power output up to 5100 watts (0
-250 V/80 Aor 0-500 V/40 Aor 0-1000 V/20 A). By connecting up to *50 power
supplies in parallel, amaximum output power can reach up to 250 kW. These power supplies
are fully programmable and controllable through analog programming, USB, RS232, RS485, GPIB
and Ethernet interface. The front numerical keypad and rotary knob provide aconvenient
interface for adjusting voltage, current, operating functions and enabling/disabling the output.
The MR series power supplies also provide over voltage protection (OVP) and over current
protection (OCP) features used to keep the output voltage and current within aspecified safety
level and preventing damage to the UUT (Unit Under Test).
1.1 Features:
High power output of up to 5100 watts (0-250V/80A) (0-500V/40A) (0-1000V/20A)
USBVCP(virtual COM)/USBTMC/RS232/RS485/Analog/GPIB and Ethernet
interfaces
Parallel connectivity for up to *50 units
Adjustable voltage and current slope
9 user defined programs with up to 100 steps each
OVP, OCP, OPP, CV to CC, and CC to CV protection
Store/recall up to 100 sets of voltage/current settings
*Parallel connectivity and operations can be configured in several different modes, however
speed and performance will decrease as each additional units are paralleled together. Refer to
section 3.6 Parallel Operation and 4.1 RS485 for more details regarding the configuration,
setup, and limitations.
If you wish to connect more than 10 units in parallel, we advise to contact us at
www.bkprecision.com for further assistance.
1.2 Package Contents
Please inspect the instrument mechanically and electrically upon receiving it. Unpack
all items from the shipping carton, and check for any obvious signs of physical
damage that may have occurred during transportation. Report any damage to the
shipping agent immediately. Save the original packing carton for possible future
reshipment. Every power supply is shipped with the following contents:
1 x MR25080, MR50040, or MR100020 Power Supply

1 x AC Power Cord
1 x Certificate of Calibration
1 x Test Report
Verify that all items above are included in the shipping container. If anything is
missing, please contact B&K Precision.
1.3 Product Dimensions
The MR25080, MR50040, and MR100020 power supply’s dimensions are
approximately: 420mm (16.54in) x88mm (3.46in) x532mm
(20.95in) (WxHxD). These 2U supplies are designed to fit in astandard 19-inch
rackmount.
Note: All dimensions in the figures below are measured in millimeters (mm).
Figure 1.1 –Front Panel Dimensions

Figure 1.2 –Side Panel Dimensions
1.4 Front Panel Overview
Figure 1.3 – Front Panel Overview

1.4.1 Front Panel Description
1
Power On/Off switch
2
Vacuum Fluorescent
Display
3
LAN Status indicator
4
Keypad lock
indicator
5
Function keys
6
Numeric keys
7
Function keys
8
Rotary Knob
9
Left, Right cursor
keys
1.5 Keypad Overview
Figure 1.4 – Keypad Overview
1.5.1 Keypad Description
Shift key
Enables access to secondary functions (Labeled in blue)
On/Off
Controls the output state.
Vset /Slope
Configures output voltage or sets the rise and fall times of the output voltage

Iset /Timer
Configures output current or setup the timer setting.
Recall /Save button
Saves and recalls instrument settings.
Escape button
Exits menu settings.
Zero /Lock button
Inputs avalue of zero or locks the front panel buttons.
Decimal /Local button
Inputs adecimal point for values or sets the instrument back to local
mode
Numeric keypad
Enters numeric values for various parameters.
Menu button
Allows access to the power supply menu settings.
Program button
Enters program mode settings menu.
Enter
Confirms setting/parameterchanges.
Rotary Knob
Adjusts numeric settings or selects menu items.
Left/Right arrow keys
Adjusts cursor position or select menu items.

1.6 Rear Panel Overview
Figure 1.5 – Rear Panel Overview
1.6.1 Rear Panel Description
10
Output
11
USB interface
12
RS-485 interface
13
Analog programming interface (DB25 connector)
14
Ethernet (LAN)interface
15
GPIB interface
16
Earth groundconnection
17
Remote sense terminals
18
RS-232 interface
19
AC inputreceptacle

1.7 Display Overview
Figure 1.6 – Display Overview
1.7.1 Display Description
1
Measured voltage
2
Settings voltage and current
3
Measured power output
4
Measured current
OFF
Indicates output is disabled
CC
Indicates constant current (CC) operation
CV
Indicates constant voltage (CV) operation
RMT
Indicates remote mode
Addr
Indicates remote communication activity
Error
Indicates an error has occurred
Shift
Indicates shift mode (access to secondary button
functions)