1. Manuals
  2. Brands
  3. Lakeshore Manuals
  4. Power Supply
  5. 620
  6. User manual

Lakeshore 620 User Manual

Magnet power supply
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Model 620 – ±50 A, ±5 V
Model 622 – ±125 A, ±30 V
Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics, Inc.
No government or other contractual support or relationship whatsoever has existed which in any way affects or mitigates proprietary
rights of Lake Shore Cryotronics, Inc. in these developments. Methods and apparatus disclosed herein may be subject to U.S. Patents
existing or applied for. Lake Shore Cryotronics, Inc. reserves the right to add, improve, modify, or withdraw functions, design
modifications, or products at any time without notice. Lake Shore shall not be liable for errors contained herein or for incidental or
consequential damages in connection with furnishing, performance, or use of this material.
Rev. 1.2
User's Manual
Model 620/622/623/647
Model 620/622/623/647
Model 620/622/623/647
Model 620/622/623/647
Magnet Power Supply
ly
w er Su pp
M ag ne t Po
Model 623 – ±155 A, ±30 V
Model 647 – ±72 A, ±32 V
Lake Shore Cryotronics, Inc.
575 McCorkle Blvd.
Westerville, Ohio 43082-8888 USA
E-Mail Addresses:
sales@lakeshore.com
service@lakeshore.com
Visit Our Website:
www.lakeshore.com
Fax: (614) 891-1392
Telephone: (614) 891-2243
P/N 119-001
Mode
Data Entry
Funct ions
Loca l
Local
Next
Normal
Function
Display
Menu
Menu
9
9
Esc
Esc
8
8
7
7
Remo te
6
5
4
Output
Inhibit
3
2
1
Cursor
.
Ente r
+/-
0
Pow er
Fau lt
Per sist ent
ter
Sw itch Hea
9 April 1999

Advertisement

Table of Contents
loading

Related Manuals for Lakeshore 620

Summary of Contents for Lakeshore 620

  • Page 1 Sw itch Hea w er Su pp M ag ne t Po Model 620 – ±50 A, ±5 V Model 623 – ±155 A, ±30 V Model 622 – ±125 A, ±30 V Model 647 – ±72 A, ±32 V Lake Shore Cryotronics, Inc.
  • Page 2 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual LIMITED WARRANTY Lake Shore Cryotronics, Inc. (henceforth Lake Shore), the manufacturer, warrants the instrument to be free from defects in material and workmanship for a period of twelve months from the date of shipment. During the...

  • Page 3: Table Of Contents

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual TABLE OF CONTENTS Chapter/Paragraph Title Page List of Illustrations ............................iv List of Tables..............................iv Foreword ..............................v Purpose and Scope ..........................v Hardware Covered..........................v Warnings, Cautions, and Notes ......................v General Installation Precautions ......................v Electrostatic Discharge ...........................
  • Page 4 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual TABLE OF CONTENTS (Continued) Chapter/Paragraph Title Page Normal Display for Manual Mode ................... 3-2 Normal Display for Manual PSH Control ................3-3 Normal Display for Automatic PSH Control................3-3 Function Menus........................3-5 3.6.1...
  • Page 5 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual TABLE OF CONTENTS (Continued) Chapter/Paragraph Title Page ERROR MESSAGES AND TROUBLESHOOTING ................5-1 General ...........................5-1 Software Error Messages .......................5-1 Factory Default Settings......................5-4 Calibration..........................5-5 Performance Test ........................5-6 Rear Panel Connector Details ....................5-8 IEEE-488 Interface Connector....................5-9 Serial Interface Cable and Adapters ..................5-9...
  • Page 6 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual LIST OF ILLUSTRATIONS Figure No. Title Page Four-Quadrant Power ........................1-4 Comparison of Old and New MPS Designs ..................1-5 RI, FLT, ON, and OVP Connections ....................2-4 Analog Monitoring, Programming, & Remote Sense Connections ..........2-5 Remote Sensing Connections......................

  • Page 7: Foreword

    FOREWORD PURPOSE AND SCOPE This manual contains user instructions for the Model 620/622/623/647 Magnet Power Supply (MPS). Lake Shore Cryotronics, Inc. designed, manufactures, and assembles the MPS in the United States of America. We welcome your comments concerning this manual. Although every effort has been made to keep it free of errors, some may occur.

  • Page 8: Handling Electrostatic Discharge Sensitive Components

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Identification of Electrostatic Discharge Sensitive Components Below are various industry symbols used to label components as ESDS: HANDLING ELECTROSTATIC DISCHARGE SENSITIVE COMPONENTS Observe all precautions necessary to prevent damage to ESDS components before attempting installation.

  • Page 9: Before You Operate The Equipment

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual BEFORE YOU OPERATE THE EQUIPMENT Train personnel in proper emergency measures such as electrical power shut off, fire department notification, fire extinguishing, and personnel and records evacuation. Here is a list of suggested personnel safety considerations: •...

  • Page 10: Safety Symbols

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual SAFETY SYMBOLS Direct current (power line). Equipment protected throughout by Alternating current (power line). double insulation or reinforced insulation (equivalent to Class II of Alternating or direct current (power line). IEC 536 - see annex H).

  • Page 11: Introduction

    50 PPM of full-scale current over an 8-hour period. • ±50 A, ±5 V (Model 620), ±125 A, ±30 V (Model 622), ±155 A, ±30 V (Model 623), or ±72 A, ±32 V (Model 647), Constant Current Output: 1.

  • Page 12: Specifications

    Overtemperature: Crowbars output and turns off input when internal heat sink temperature exceeds 95 °C. AC Input: Models 620/622/623 are factory set for operation from 100, 120, 200/208, 220, or 240 VAC (–10%, +5%) 50 to 60 Hz single phase. Model 647 is factory set for operation from 200/208, 220, or 240 VAC (–10%, +5%) 50 to 60 Hz single phase.
  • Page 13 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Front Panel: Contains a menu driven keyboard and graphic display for entry and display of results. Operating parameters to set and monitor from the front panel (and remote interface) include: • Output current and compliance voltage setting.

  • Page 14: Operating Characteristics

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Table 1-4. Model 647 DC Output Specifications SPECIFICATION CURRENT VOLTAGE Digital Programming Resolution: 10 mA / 1 mA 10 mV / 1 mV Standard/High Digital Programming Accuracy 0.1% I 1% V 0.01% I...

  • Page 15: Low Noise, High Stability Current Regulated Output

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Conventional MPS: Consists of a unipolar power supply with an energy absorber to dissipate magnet energy during discharge. The energy absorber prevents reverse voltage generated during the discharge from damaging the unipolar supply output. Other conventional supplies dissipate magnet energy in the power supply output transistor pass-bank.

  • Page 16: Highly Efficient, Air-Cooled, Compact Unit

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 1.3.3 Highly Efficient, Air Cooled, Compact Unit Lake Shore MPS: Quiet switched-mode design. The output uses a proprietary pulse width modulated technique that incorporates power hybrid circuitry. Extremely low conduction loss components minimize internal power dissipation.

  • Page 17: Initial Setup And Connections

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 2 INITIAL SETUP AND CONNECTIONS INSPECTING AND UNPACKING The MPS ships in a special cardboard box with integrated forklift skid openings. Do not stack anything on top of the MPS box. Upon receipt, set the box on a level surface with the pallet side down. Inspect the shipping container for external damage.

  • Page 18: Power And Ground Requirements

    2.4.2 MPS Input Power Ratings Operate the Model 620/622/623 from a nominal 100, 120, 200/208, 220, or 240 VAC (–10%, +5%) single-phase AC power source, 50 to 60 Hz. Table 1-1 lists input voltage range and maximum current required for each nominal input.

  • Page 19: Power Up

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Use this procedure to connect input power to the MPS: 1. Loosen the two connector cover screws and open the cover. 2. Slip the strain relief over the power cable with the flanged end at the end to be terminated.

  • Page 20: Shielding, Grounding, And Noise

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2.5.2 Shielding, Grounding, and Noise For noise reduction, tightly twist and shield the leads from the MPS to the magnet. Connect the shield to the MPS chassis as shown in Figure 2-3.

  • Page 21: Mps Analog Current And Voltage Monitoring Connections

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2.5.6 MPS Analog Current And Voltage Monitoring Connections The MPS provides amplified and buffered Table 2-2. Analog Monitoring, Programming, current and voltage monitor output signals and Remote Sense Connections at the terminal block on the back panel.

  • Page 22: Multiple Auto-Parallel Setup

    For example four 623 MPS units provide 4 155 = 620 amps total current. The maximum total power is the sum of the maximum power ratings of the individual units.
  • Page 23 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual c. Locate Communications Microprocessor (CMP) in the MPS rear panel. The CMP is the module with two RJ-11 telephone jacks. Loosen two screws securing CMP to MPS rear panel and slide CMP out.

  • Page 24: Multiple Mps Remote Inhibit Mode

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual MODE OVP Im Vm m Vp +Vs -ls lp +ls -S +S CAL AND ID 9 10 11 12 13 14 15 16 17 18 LINE -10% +5% 50-60 Hz FIXED INTERNALLY...

  • Page 25: Post-Installation Instructions

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual POST-INSTALLATION INSTRUCTIONS The MPS is electrically and mechanically inspected and operationally tested prior to shipment. It should be damage-free and in perfect working order upon receipt. To confirm this, visually inspect the instrument for damage and test it electrically to detect any concealed damage upon receipt.
  • Page 26 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank 2-10 Setup & Connections...

  • Page 27: Operation

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 3 OPERATION GENERAL This chapter covers seven areas: MPS Front Panel (Paragraph 3.1), Power Up (Paragraph 3.2), Setting Current on an MPS with Manual PSH Control (Paragraph 3.3), Setting Current with Automatic PSH Control (Paragraph 3.4), Instrument Setup Screens (Paragraph 3.5), Function Menus (Paragraph 3.6), and an...

  • Page 28: Power Up

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual POWER UP Read and follow instructions in Paragraphs 2.1 - 2.4.3 and the Forward safety recommendations before applying power to the MPS. Do not connect the MPS to the magnet yet. Short the output terminals together with a #4 gauge or larger cable to protect the magnet against incorrect configurations.

  • Page 29: Normal Display For Manual Psh Control

    MGT START: 0 to ±50.000 A (620), 0 to ±125.000 A (622), 0 to ±155.000 A (623), 0 to ±72.000 A (647) Magnet Start Current. The current in the magnet in persistence prior to the automatic run. The MPS opens the persistence switch after it reaches this current and the user-specified delay expires.
  • Page 30 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual MGT END: 0 to ±50.000 A (620), 0 to ±125.000 A (622), 0 to ±155.000 A (623), 0 to ±72.000 A (647) Magnet End Current. The desired magnet current. To set a new current, move to the MGT END line and enter a new current, then move to the RUN line and toggle to activate Automatic Mode.

  • Page 31: Function Menus

    Display viewing angle. 9 indicates viewing from above, 5 in the middle, and 2 from below. Initial value is 5. MF ID: 620 (1), 622 (1), 623 (1), or 647 (1) (Read only) MPS ID. A 1 indicates only one MPS. On the master MPS (MPS1) of a multiple MPS configuration, the number indicates the number of units connected in parallel.

  • Page 32: 3.6.1.3 Step Limit/Zero Screen

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.6.1.3 Step Limit/Zero Screen Press the Function Menu key to display Function Menu 1. Press the STEP LIMIT/ZERO Function Key to display the Step Limit/Zero screen to the right. This screen combines two features: Current Step Limit and Current Zero.

  • Page 33: Function Menu 2

    To set IMAX, move to the IMAX SET line and enter the maximum current allowed for the magnet. COMPLIANCE: 0.00 V to ± 5.00 V (620), ± 30.00 V (622 & 623), or ± 32.00 V (647) Compliance Voltage Limit. The MPS cannot exceed the Compliance Voltage Limit of the given model.

  • Page 34: 3.6.2.1 Outputs Only Screen

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.6.2.1 Outputs Only Screen Press the OUTPUT ONLY Function key to display a screen with output values in larger characters for remote viewing. There are two screens: one with the LHe Level/Field Option, one without the LHe Level/Field Option.

  • Page 35: Delays Setup Screen With Dithering

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3.6.3.2 DELAY SETUP SCREEN WITH DITHERING To access the dithering feature, turn ON (up position) switch 5 of the rear panel CAL AND ID DIP switches. Select DELAY/DITHER from Function Menu 3 to display the AUTOMATIC MODE DELAY screen to the right.

  • Page 36: Typical Automatic Mode Cycle

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 2. Enter these parameters in the Automatic Mode Screen: MAG START: Magnet Start Current (only if LAST END is unknown). For this example, we assume an initial MPS hook-up to this magnet and a previous magnet charge to 20 A.

  • Page 37: Dithering In Automatic Mode

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual DITHERING IN AUTOMATIC MODE Dithering is a means of arriving at the magnet current by executing excursions around the final current which decay to zero in a specified dwell (delay) time.
  • Page 38 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank. 3-12 Operation...

  • Page 39: Remote Operation

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 4 REMOTE OPERATION 4.0. GENERAL Either of two computer interfaces on the optional 6224 card permit remote MPS operation: the IEEE-488 Interface (Paragraph 4.1) and the Serial Interface (Paragraph 4.2). Use only one of the interfaces at a time.

  • Page 40: Ieee-488 Command Structure

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.1.2 IEEE-488 Command Structure The Model 622/623 supports several command types. There are three groups of commands: 1. Bus Control – see Paragraph 4.1.2.1. a. Universal (1) Uniline (2) Multiline b. Addressed Bus Control 2.

  • Page 41: 4.1.3.1 Status Byte And Service Request Enable Registers

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.1.3.1 Status Byte and Service Request Enable Registers The Status Byte Register consists of a single data byte containing seven bits of MPS status information. STATUS BYTE REGISTER FORMAT Weighting Bit Name If the Service Request is enabled, any bits that are set cause the MPS to pull the SRQ management low to signal the BUS CONTROLLER.

  • Page 42: Example Ieee Setup And Program

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual The Standard Event Status Enable Register enables any of the Standard Event Status Register reports. The Standard Event Status Enable command (*ESE) sets the Standard Event Status Enable Register bits. Set a bit to enable its function.

  • Page 43: Notes On Using The Ieee Interface

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.1.5 Notes On Using the IEEE Interface • The term "free field" indicates a floating decimal point that may be placed any appropriate place in the string of digits. • [term] indicates where the user places terminating characters or where they appear on a returning character string from the MPS.

  • Page 44: Typical National Instruments Gpib Configuration From Ibconf.exe

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual National Instruments GPIB0 Configuration GPIB-PC2/2A Ver 2.1 Primary GPIB Address ....0 Select the primary GPIB address by Secondary GPIB Address .....NONE using the left and right arrow keys. Timeout setting......10sec This address is used to compute the Terminate Read on EOS ....Yes...

  • Page 45: Serial I/O Interface

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual SERIAL I/O INTERFACE RS-232C is a standard of the Electronics Industries Association (EIA) and one of the most common interfaces between a computer and electronic equipment. The Customer supplied computer must have a Serial Interface port.

  • Page 46: Serial Interface Hardware Configuration

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.2.1 Serial Interface Hardware Configuration Below is a technical description of the 6224 option card for the Serial Interface configuration. (Note: See Appendix C for Serial Interface on CMP.) Table 4.2 defines communication parameters. Terminators are fixed to Carriage Return (CR) and Line Feed (LF).

  • Page 47: Notes On Using The Serial Interface

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.2.4 Notes On Using The Serial Interface • To chain commands together, insert a semi-colon (;) between them. Multiple queries cannot be chained. • Queries use the same syntax as the associated setting command followed by a question mark (?). They usually return the same information that is sent.

  • Page 48: Summary Of Ieee-488/Serial Interface Commands

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual SUMMARY OF IEEE-488/SERIAL INTERFACE COMMANDS Below is an alphabetical list of IEEE-488/Serial Interface commands consisting of Operational Commands (Paragraph 4.3.1), Interface Commands (Paragraph 4.3.2), Ramping Commands (Paragraph 4.3.3), Current Zero Commands (Paragraph 4.3.4), Current Step Limit Commands (Paragraph 4.3.5), Computed Field Commands (Paragraph 4.3.6), and Common Commands (Paragraph 4.3.7).

  • Page 49: Operational Commands Description

    Input: IMAX? Returned: A number between 0 and +50 A (620), 0 and +125 A (622), 0 and +155 A (623), or 0 and +72 A (647). Remarks: Nine characters plus up to two terminators are returned. Value is shown as a “+,”...
  • Page 50 Enter Compliance Voltage Input: VSET [voltage] or V [voltage] where [voltage]: = a value from 0 and ±5.000 V (620), 0 and ±30.000 V (622/623), or 0 and ±32.000 V (647). Remarks: The initial condition is +00.0000 V. The voltage setting is always forced to a “+.” Control Bus inputs 4 places, display rounds to 0.01 or 0.001 place.

  • Page 51: Interface Commands Description

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.2 Interface Commands Description The MPS Interface Commands below help configure IEEE-488 interface compatibility for a variety of computer equipment. Programs MPS Interface EOI (End Or Identify) Status Input: END [status] where [status] = 0 to enable the EOI, or 1 to disable it.

  • Page 52: Ramping Commands Description

    [initial ramp current] = 0 and ±50 A (620), 0 and ±125 A (622), 0 and ±155 A (623), or 0 and ±72 A (647). [final ramp current] = 0 and ±50 A (620), 0 and ±125 A (622), 0 and ±155 A (623), or 0 and ±72 A (647).

  • Page 53: Current Zero Commands Description

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.4 Current Zero Commands Description The following MPS commands configure the various functions of the current zero features. IMODE? Current Programming Mode Query Input: IMODE? Returned: 0 if I MODE switch is set to EXT, or 1 if set to INT.

  • Page 54: Current Step Limit Commands Description

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.5 Current Step Limit Commands Description The following MPS commands configure the various functions of the current step limit features. ISTP Programs Output Current Step Limit Input: ISTP [step limit] where [step limit] = a value between 0 and +999.9900.

  • Page 55: Computed Field Commands Description

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.6 Computed Field Commands Description The MPS can also display Computed Field rather than current. This is useful with Superconducting magnets because there is a linear relationship between the current and actual field to a reasonable degree of accuracy.

  • Page 56: Common Commands Description

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 4.3.7 Common Commands Description The MPS Common Commands below are input/output commands defined by the IEEE-488 standard and shared with other instruments complying with the standard. Common commands begin with “*”.
  • Page 57 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual *IDN? Identification Query Input: *IDN? Returned: Manufacturer, Model Number, Model Serial Number, Firmware Date. Remarks: Returns seventeen characters plus up to two terminators. Example: LSCI,622,0,120193[term] *OPC Operation Complete Status Input: *OPC Returned: Nothing.
  • Page 58 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Enables Status Reports In The Service Request Enable Register Input: *SRE [bit weighting] where [bit weighting] = the sum (000 to 255) of bit weighting of each bit to be set. See the discussion on registers and below.

  • Page 59: Error Messages And Troubleshooting

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 5 ERROR MESSAGES AND TROUBLESHOOTING GENERAL This chapter covers Software Error Messages The MPS sounds the alarm and halts operation until (Paragraph 5.1), Factory Default Settings (Para- the user presses a Data Entry up or down key to clear graph 5.2), Calibration Procedure (Paragraph 5.3),...
  • Page 60 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual No delay is allowed (CAL AND ID switch 7 OFF, down) and multiple MPS operation (CAL AND ID switch 4 ON, up) must be selected. After the load discharges, turn OFF all units to reset. The MPS displays the OVP error message: The alarm sounds until the level alarm is turned OFF.
  • Page 61 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual High AC (HI AC) Detected Output Inhibit Any time the AC line rises above 120% of the When the red Output Inhibit button is pressed, the nominal line selected, the MPS turns off the front MPS displays: panel circuit breaker and enters AC Loss Mode.

  • Page 62: Factory Default Settings

    B UNITS: kG – Magnetic B-Field Units kG/A: ±0.100 – Field per Amperes IMAX SET: ±50.000A (620), ±125.000A (622), ±155.000A (623), ±72.000A (647) – Maximum Current COMPLIANCE: ±5.000V (620), ±30.000V (622/623), ±32.000V (647), – Maximum Compliance Voltage (Retains Last Setting On Power Down)

  • Page 63: Calibration

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CALIBRATION NOTE: Calibration is only as accurate as the current monitor shunt. The factory uses a current monitor shunt rated at 0.02% accuracy. Shunt manufacturers typically stock accuracy values of 0.25% or better. To use a different value, adjust readings given in the procedure.

  • Page 64: Performance Test

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 17. Send IZER to force output current to 0 amps. Verify a DVM reading of 0V ±0.01V. Allow MPS output to settle for 2 minutes. 18. Convert DVM voltage reading to current. A reading of +0.000345V equals +0.345A. Send actual current using CALZ+xxx.xxxx.
  • Page 65 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Output Voltage Verification 5. From the MPS front panel, select the Instrument Setup (INSTR. SETUP) menu and change compliance voltage to 5 V. Press the Normal Display key to return to the Normal Display screen.

  • Page 66: Rear Panel Connector Details

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual REAR PANEL CONNECTOR DETAIL Figure 5-1 MPS Rear Panel Connectors MPS Rear Panel Connectors MODE OVP Im Vm m Vp +Vs -ls lp +ls -S +S CAL AND ID 9 10 11 12 13 14 15 16 17 18...
  • Page 67 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual IEEE-488 INTERFACE CONNECTOR (WHEN MODEL 6224 OPTION IS PRESENT) Connect to rear MPS IEEE-488 Interface connector with cables specified in the IEEE-488-1978 standard document. The cable has 24 conductors with an outer shield. The connectors at each end are 24-way Amphenol 57 Series (or equivalent) with piggyback receptacles to daisy-chain multiple devices.

  • Page 68: Serial Interface Cable And Adapters

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual SERIAL INTERFACE CABLE AND ADAPTERS To aid in Serial Interface troubleshooting, the figures below provide wiring information for the cable assembly and the two mating adapters. C-MPS-5-4.eps Figure 5-4. Model 2001 RJ-11 Cable Assembly Wiring...

  • Page 69: Options And Accessories

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual CHAPTER 6 OPTIONS AND ACCESSORIES GENERAL This chapter covers MPS options and accessories: Model 6224 IEEE-488/Serial Interface installation (Paragraph 6.1), Model 6226/6476 Liquid Helium Level and Gaussmeter Input Card (Paragraph 6.2), Model 6228 Persistent Switch Heater Output (Paragraph 6.3), Model 6228-2 Persistent Switch Heater Output...

  • Page 70: Hall Sensor Mounting Considerations - Models Hgct-3020 And Hgca-3020

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Below are specifications for the Model 6226/6476 Liquid Helium Level and Gaussmeter Input Card: Liquid Helium Level: Probe Type: NbTi Superconducting Filament Sample Period: Fixed at 5 seconds Number of Inputs: 1 four lead measurement...

  • Page 71: The Model Msa-410 And Mst-410 Hall Sensors

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Locate the probe in a cavity that is 0.003 inch wider and 0.01 inch longer than the substrate, and with a depth the same or slightly greater than the thickness of the package. Tack the leads outside the slot with GE-7031 varnish or other similar substance.

  • Page 72: Lhe Level

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.2.5 LHe Level Access liquid helium level and field monitoring from the MPS front panel. Press Function Menu and then Next Menu to display Function Menu 2. If the Model 6226/6476 Option is not present, <NP>...

  • Page 73: Field Probe Setting And Calibration

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.2.5.2 Field Probe Setting and Calibration Press Function Menu and then Next Menu to display Function Menu 2. Press the FIELD Function key to display the Field screen to the right.

  • Page 74: Model 6226/6476 Ieee-488 Remote Operation Commands

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Look up the R in Table 6-2 at the temperature of the sensor during measurement. Use the equation: M M O Table 6-2. NbTi Filament Resistance Values effective Temp. (K) Temp. (°C) Temp. (°F)
  • Page 75 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual IBS? Magnetic Field Summary Query Input: IBS? Returned: [IOUT], [BFLD], [STB] Remarks: Returns 23 characters plus up to two terminators. LALM Program Level Alarm Input: LALM [alarm] where [alarm] is the level value between 0 and ±999.9 that activates the alarm.
  • Page 76 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual LUNI? LHe Level Units Query Input: LUNI? Returned: % for percentage, E for English units (inches), or M for metric units (centimeters) Remarks: Returns one character plus up to two terminators are returned.

  • Page 77: Model 6228 And 6228-8Mux Persistent Switch Heater Output

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual MODEL 6228 AND 6228-8MUX PERSISTENT SWITCH HEATER OUTPUT The Model 6228 Persistent Switch Heater (PSH) Output Option provides a variable 0-124 mA DC output in 4 mA increments. The output compliance is an 8 volt minimum and the load can be up to 100 ohms. An MPS front panel annunciator indicates PSH output current status.

  • Page 78: Model 6228-8Mux Operation

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual When PSH is ON, the MPS compares the present current setting with the current setting stored when PSH was OFF. If the two do not match, the MPS sounds the alarm for ½ second and displays: Press a Data Entry up or down arrow to turn ON the PSH.

  • Page 79: Model 6228 Remote Operation Commands

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 3. The selected current multiplied by the heater resistance (e = i r) must be less than 15 Vdc for the MPS to accurately determine compliance of the switch heater (open resistance).

  • Page 80: Model 6228-2 Persistent Switch Heater Output

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual PSHS? PSH Summary Query Input: PSHS? Returned: [PSH][PSH status][PSH compliance][current value][command status] where: [PSH] = 0 if PSH is present, or 1 if PSH is not present, [PSH heater status] = 0 if heater is OFF, or 1 if it is ON, [PSH compliance] = 0 if PSH is under compliance or 1 if it is over.

  • Page 81: Model 6228-2 Remote Operation Commands

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual 6.4.1 Model 6228-2 Remote Operation Commands IPSHB Program PSH Current Input: IPSHB [current] where [current] = a value from 0 to 125 mA Remarks: The initial condition is 0 mA. Current can be set from 0 to 125 mA but will actually be set in 4 mA increments.

  • Page 82: Accessories

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual ACCESSORIES Accessories are devices that perform a secondary duty as an aid or refinement to the primary unit. Below are MPS accessories. MODEL NUMBER DESCRIPTION OF ACCESSORY 106-720 Terminal Block Mate, 18-Contact.
  • Page 83 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual APPENDIX A UNITS FOR MAGNETIC PROPERTIES Conversion from CGS to SI Units Gaussian Conversion SI & Quantity Symbol & CGS emu Factor, C Rationalized mks Magnetic flux density, tesla (T), Wb/m...
  • Page 84 Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual This Page Intentionally Left Blank Magnetic Units...

  • Page 85: B1.0 General

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual APPENDIX B MAINFRAME CONTROL BUS OPERATION B1.0 GENERAL There are seven elements to the Model 622/623 Mainframe Control Bus operating instructions: Control Bus Serial Interface Specifications (Paragraph B2.0), Control Bus Serial Interface Connector (Paragraph B3.0), Control Bus Serial Interface Configuration (Paragraph B4.0), Selecting the Control Bus Serial Interface...

  • Page 86: B4.0 Control Bus Serial Interface Configuration

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual B4.0 CONTROL BUS SERIAL INTERFACE CONFIGURATION Configure the control bus serial interface for either RS-232C or RS-485 communications with DIP switches on the Communications Processor Board (CMP). The CMP plugs into the Mainframe rear panel. The standard control bus serial interface configuration is RS-485.

  • Page 87: B6.0 Control Bus Serial Interface Operation

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual B6.0 CONTROL BUS SERIAL INTERFACE OPERATION The host computer initiates the serial interface link and transmits either a command or a query to the Mainframe. The Mainframe stores the characters in a buffer until the carriage return (CR), line feed (LF) terminator sequence.

  • Page 88: B7.0 Control Bus Serial Interface Sample Program

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual B7.0 CONTROL BUS SERIAL INTERFACE SAMPLE PROGRAM The following PC program is an interactive program that prompts the user for a Mainframe command and displays the Mainframe response. The command must include a query for the Mainframe to respond.

  • Page 89: B-1 Mps Mainframe Control Bus Remote Command Summary

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Table B-1 MPS Mainframe Control Bus Remote Command Summary Input Query Function Command *CLS – Clear all pending status. *ESE *ESE? Event status register enable. – *ESR? Event status register contents.

  • Page 90: B-2 Additional Mps Mainframe Control Bus Remote Commands

    Lake Shore Model 620/622/623/647 Magnet Power Supply User’s Manual Table B-2 Additional MPS Mainframe Control Bus Remote Commands Input Query Function Command – Mainframe address. Multidrop address 0-32 available. Commands sent must have the address as the first character. Query response will be “00”...

This manual is also suitable for:

622623647

Table of Contents