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Microchip Technology 5071A User Manual

Microchip Technology 5071A User Manual

Primary frequency standard
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5071A Primary Frequency
Standard User's Guide
 2022 Microchip Technology Inc. and its subsidiaries
DS50003249A

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  • Page 1 5071A Primary Frequency Standard User’s Guide  2022 Microchip Technology Inc. and its subsidiaries DS50003249A...
  • Page 2 Microchip Technology Inc. in other countries. stated. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies.

  • Page 3: Preface

    The guidelines in the document are generic because spe- cific product requirements vary from one application to the other. This material consists of a brief description of 5071A features, programming, and oper- ating instructions. WHO SHOULD READ THIS GUIDE...

  • Page 4: Conventions Used In This Guide

    Curly brackets and pipe Choice of mutually exclusive errorlevel {0|1} character: { | } arguments; an OR selection Ellipses... Replaces repeated text var_name [, var_name...] Represents code supplied by void main (void) user { ...  2022 Microchip Technology Inc. DS50003249A-page 4...

  • Page 5: Warnings, Cautions, Recommendations, And Notes

    Time Systems (FTS) Services and Support: U.S.A. Call Center: including Americas, Asia and Pacific Rim Microchip Frequency and Time Systems 3870 N 1st St. San Jose, CA 95134 Toll-free in North America: 1-888-367-7966 Telephone: 408-428-7907  2022 Microchip Technology Inc. DS50003249A-page 5...

  • Page 6: The Microchip Website

    (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the website at: http://www.microchip.com/support.  2022 Microchip Technology Inc. DS50003249A-page 6...

  • Page 7: Document Revision History

    Preface DOCUMENT REVISION HISTORY Revision A (March 2022) • Initial release of this document as Microchip DS50003249A. - Under Microsemi’s literature system, this document was 05071-90041, Rev. J  2022 Microchip Technology Inc. DS50003249A-page 7...

  • Page 8: Table Of Contents

    Customer Support ....................6 Document Revision History .................. 7 Chapter 1. Introduction....................12 1.1 What is the 5071A Primary Frequency Standard? ........12 1.2 How Does the 5071A Work? ................. 12 1.3 5071A Major Features................... 12 1.4 System Applications ..................13 1.5 Instruments Covered by this User’s Guide............
  • Page 9 Chapter 3. Using the 5071A ..................28 3.1 Using the Front-Panel Menus................ 28 3.1.1 Keypad Descriptions ...................28 3.1.2 Controlling the 5071A From the Front Panel ..........28 3.2 Setting the Output Port Frequency..............29 3.3 Setting the 1PPS and Clock Outputs ............29 3.3.1 To Set the 1PPS Outputs................29...
  • Page 10 5.6.2 SCPI Considerations For HP BASIC ............52 5.6.3 Example Program..................53 5.7 Tips on Using the RS-232C Port on the 5071A..........57 5.7.1 Keypad Lock-Ups: Why Do They Occur and How Are They Cleared? ..57 5.7.2 Using Ctrl-Q in Programs ................58 5.8 Setting the Serial Port Parameters with the Option 300 Front Panel ....
  • Page 11 8.3 Returning the 5071A to Microchip ..............93 8.4 Operator’s Maintenance ................95 8.5 Operating the 5071A From External DC Power ..........95 8.5.1 Preparing the 5071A For External DC Operation ........95 8.5.2 Replacing the External DC Input Power Fuse ..........96 8.6 Internal Standby Battery Maintenance ............

  • Page 12: Chapter 1. Introduction

    WHAT IS THE 5071A PRIMARY FREQUENCY STANDARD? The 5071A is a source of extremely accurate and stable output frequencies. The accu- racy of the 5071A is within a few parts in 10 of the internationally accepted definition of frequency.

  • Page 13: System Applications

    Coordinated Universal Time (UTC). See more information about the MJD later in this section. 1PPS outputs: There are three 1PPS outputs on the 5071A, one on the front panel and two on the rear panel. All are synchronous (pulses occur at the same time) and isolated from each other so that a short circuit or other disturbance on one cannot affect the amplitude or timing on the others.
  • Page 14 You select either input using the front-panel controls or via RS-232. Leap second: The 5071A can be easily set to add or delete a leap second on a desig- nated day. The leap second is automatically added-to or subtracted-from the last min- ute of the day.

  • Page 15: Safety Considerations

    Remote operation: The 5071A may be operated completely through remote control. The RS-232C port on the rear panel allows the 5071A to be connected to a computer. The 5071A is programmed in a standard language called standard commands for pro- grammable instruments (SCPI) based on IEEE 488.2.

  • Page 16: Before Cleaning

    1.7.6 Rack Mounting The Model 5071A unit is designed for mounting in a standard 19-inch (48.26 cm) rack. Follow the rack manufacturer's instructions for mounting the Model 5071A unit while observing the following guidelines: •...

  • Page 17: Ac Power Supply

    AC Power Supply WARNING The Model 5071A unit should only be plugged into a grounded receptacle. Microchip recommends that the chassis external ground be connected to a reliable earth ground. Any interruption of the protective grounding conductor (inside or outside the instru- ment) or disconnecting the protective earth terminal will cause a potential shock haz- ard that could result in personal injury.

  • Page 18: Certification

    Institute's calibration facility, and to the calibration facilities of other International Standards Organization members. 1.7.13 Assistance For complete warranty terms, certifications, product maintenance agreements, and other customer assistance agreements, please contact your nearest Microchip Sales and Service Office.  2022 Microchip Technology Inc. DS50003249A-page 18...
  • Page 19 5071A Primary Frequency Standard User’s Guide NOTES: DS50003249A-page 19  2022 Microchip Technology Inc.

  • Page 20: Chapter 2. Getting Started

    This section introduces the front-panel interface menus and shows how to perform more complex time-keeping tasks. THE 5071A AT A GLANCE If you've unpacked and inspected the 5071A, and are ready to operate it, see Starting 5071A. The front-panel features are illustrated and briefly described on the following pages.
  • Page 21 5071A Primary Frequency Standard User’s Guide FIGURE 2-1: Front Panel. DS50003249A-page 21  2022 Microchip Technology Inc.

  • Page 22: Rear Panel Connections

    Getting Started REAR PANEL CONNECTIONS The item numbers in the following table correspond to the callouts in Figure 2-2 Figure 2-3. FIGURE 2-2: Rear Panel.  2022 Microchip Technology Inc. DS50003249A-page 22...
  • Page 23 5071A Primary Frequency Standard User’s Guide FIGURE 2-3: 48V Option Rear Panel. TABLE 2-1: CONNECTOR DESCRIPTIONS Item Program Function Connector Type Signal Characteristics Number Control Sinusoidal, 1V into 50Ω, Output: Port 1, 5 MHz or 10 MHz Type N Female...

  • Page 24: Starting The 5071A

    Any subsequent fault will cause the Continuous Oper- ation light to go out or flash. (See Troubleshooting Tips for details.) The 5071A will power up at shipment receipt with the following configuration: Output Ports • Port 1: 5 MHz output • Port 2: 10 MHz output RS-232C •...

  • Page 25: Performing Basic Tasks

    5. Press Enter, then press → to select ARM FRONT or ARM REAR. 6. Press Enter to arm the selected sync input connection. The 5071A will synchro- nize to within ±50 ns on the next sync pulse and the display will show Caught a Sync Pulse.

  • Page 26: Setting Time And Date

    Note: Some models do not have internal-standby battery. See Appendix B. If the 5071A is used in a system or operation where power is removed on a daily or more frequent basis, it is strongly recommended that the internal-standby batteries be physically disconnected.
  • Page 27 5071A Primary Frequency Standard User’s Guide NOTES: DS50003249A-page 27  2022 Microchip Technology Inc.

  • Page 28: Chapter 3. Using The 5071A

    3.1.2 Controlling the 5071A From the Front Panel You can customize the 5071A's operation by performing a number of tasks after the instrument is running normally (see Performing Basic Tasks). When you've completed most of these tasks, no further operator intervention will usually be required.

  • Page 29: Setting The Output Port Frequency

    Use the following procedure to synchronize the 1PPS outputs manually: 1. Connect the reference 1PPS signal to the START input of the TI counter. 2. Connect the 5071A's 1PPS Output to the STOP input of the TI counter. DS50003249A-page 29...

  • Page 30: To Set The Clock

    During the course of configuring and using the 5071A, you'll have occasion to set the date. The 5071A uses the MJD to date log entries as well as tagging the day that a leap second is to be added or subtracted.

  • Page 31: To Turn The Clock Display On Or Off

    3.3.5 To Schedule a Leap Second You can pre-program the 5071A to add or subtract a leap second on a designated MJD. 1. Select the CLOCK menu. 2. Select LEAPSEC, press Enter, enter the effective date (MJD), and press Enter.

  • Page 32: To Print A Status Report

    STEERING THE OUTPUT FREQUENCY 3.6.1 Steering Explained In normal operation, the output frequencies of the 5071A are in fixed relation to the Cesium Beam tube response. This relationship provides the basis for traceability of the 5071A to the international definition of time.

  • Page 33: To Add An Offset

    3. Press Enter to initiate the offset, or Prev to cancel the operation and return to next-higher menu level. Note: The 5071A rounds the entered offset to the nearest multiple of 6.331991 x –15 , and displays it when you press Enter. The rounded value is dis- –15...

  • Page 34: Using Utility Features

    Running these tests requires Standby Mode, disrupting the instrument's time keeping and output frequency functions. The TEST option of the UTIL menu is provided for use by qualified personnel only. Refer to the Assembly-Level Service manual for more information.  2022 Microchip Technology Inc. DS50003249A-page 34...

  • Page 35: Configuring The 5071A

    When you put the 5071A into Standby mode, the Cesium Beam tube is shut down except for the Ion pump. The 5071A will not maintain accurate time or frequency in this mode. Placing the instrument back into Normal mode initiates the normal CBT power-up sequence.

  • Page 36: To Save A Configuration

    Note: This stores the Display angle, Output frequencies, Serial port settings, and Log mode in nonvolatile memory. CONNECTING A PRINTER You can connect a printer to the 5071A to create a hard copy output of the internal event log entries or print current status. Refer to...
  • Page 37 5071A Primary Frequency Standard User’s Guide NOTES: DS50003249A-page 37  2022 Microchip Technology Inc.

  • Page 38: Chapter 4. Troubleshooting Tips

    FRONT-PANEL INDICATORS AND MESSAGES Note: All references to internal-battery power, battery status, or battery operation do not apply for 5071A 48V option. You can use the front-panel indications and messages to assess the instrument's operation and status. The warning messages that can appear on the front panel LCD are listed and explained on the next two pages.

  • Page 39: Lcd Display

    If the internal battery became exhausted while attempting to sustain oper- ation, it cannot be assumed that it is completely re-charged until the 5071A has been connected to AC mains for at least 16 hours.

  • Page 40: Instrument States

    Log Menu choice. 4.1.6 Front-Panel Warning Messages If you attempt an operation that isn't allowed, the 5071A will make an audible beep and display one of three possible warning messages: 4.1.6.1 REMOTE MODE The LCD display shows the small padlock symbol at the far right-hand side of the screen.

  • Page 41: Power-Up Problems

    3. Attempt to restart the instrument. If you attempt to start the 5071A in a normal operating environment with the correct AC voltage set and the instrument reports a fatal error or appears otherwise unresponsive. 1. Attempt restart twice if the instrument does not power up.

  • Page 42: Utilities Menu

    • Serial port OPERATING SYSTEM FAILURE This section provides information to check symptoms associated with operating system failures and a procedure to restart the 5071A in the event of such a failure. 4.4.1 Operating System Failure Symptoms The following five symptoms are associated with operating system failure: •...

  • Page 43: Cesium Beam Tube Life

    5071A Primary Frequency Standard User’s Guide apply to models without a battery. 4. Re-apply AC line power. 5. Observe the instrument for successful completion of the normal power-up and warm-up sequence.\ CESIUM BEAM TUBE LIFE This section provides information to check the long-term operating status of the instrument's Cesium Beam tube.

  • Page 44: Chapter 5. Remote Operating And Programming

    5071A PRIMARY FREQUENCY STANDARD USER’S GUIDE Chapter 5. Remote Operating and Programming This section gives you the information required to set up and operate the 5071A as a remote device. REMOTE-OPERATION SETUP 5.1.1 Remote Interface Features The 5071A's remote or serial port interface provides a variety of features for such tasks •...

  • Page 45: Serial-Port Configuration

    2. Select Accessories, Hyperterminal, and Hyper Terminal. The Connection Description dialog box is displayed. 3. In the "Name" window, type 5071A (for example), select one of the icons (the first one will do), then click OK. The Connect To dialog box is displayed.

  • Page 46: Programming Overview

    After reading this section you will have a basic knowledge of how to use and understand the SCPI commands for the 5071A Primary Frequency Standard. The details of the 5071A's SCPI and IEEE common commands appear in the next section and include summary tables that describe all command subsystems, syntax, parameter ranges, values, and response forms for possible command queries.

  • Page 47: Scpi Command And Query Format

    Upper case letters indicate the abbreviated spelling for the command. For shorter program lines, send the abbreviated form. For better program readability, you may send the entire command. The 5071A accepts either command form and is not case sensitive.
  • Page 48 Here, the first command is always referenced to the root node. Subsequent commands, separated by ;, are referenced to the same level as the previous command if no : is present immediately after the command separator. For example, sending:  2022 Microchip Technology Inc. DS50003249A-page 48...

  • Page 49: Rst Reset Response

    5.4.3 *RST Reset Response The 5071A reset response (Initialization state) is the configuration acquired at program reset. The following table summarizes this state. Once a configuration has been saved, it will persist even if power is removed or until it is reprogrammed (through SCPI commands or through the front-panel menus).

  • Page 50: Status Monitoring Tasks

    In the following tables (in the "Program Dialog" column), the command you send is listed in bold font, the 5071A's responses are in unbolded font. If you make a mistake (i.e., generate an error # at the scpi prompt) type "*cls" followed by <CR><LF> (Return Line Feed).
  • Page 51 5071A Primary Frequency Standard User’s Guide 5.5.2.1 EXAMPLE PROGRAM 1—CONFIGURATION Program Dialog Task Function DIAG:STAT:GLOB? Request the operating status of the 5071A. "Operating normally" scpi > SYST:REM ON Command the 5071A to enter Remote mode. DIAG:CONT:RESET Set/Reset the Continuous Operation light on the front panel.

  • Page 52: Batch Processing For The Program Commands

    Serial-Port Command/Printer Interface. An IEEE-488.2 to RS-232 converter can also be used to drive the 5071A from an IEEE-488.2 interface. The converter must provide buffering for the incoming serial data because the serial port of the 5071A uses full-duplex operation.

  • Page 53: Example Program

    If an instrument controller is to be used to control the 5071A, it must buffer incoming data while sending data. If the loss of data-rate is acceptable, it is possible to suppress full-duplex operation using the XON/XOFF protocol.
  • Page 54 ! Serial A/Com 1. Baud=9600 Return$=FNConfig_ser_port$(Com_port,Baud) PRINT Return$ ASSIGN @Ser_in TO Com_port;FORMAT ON ASSIGN @Ser_out TO Com_port;FORMAT ON !-------------------------------------------------------------- ! Command and Query 5071A. Return$=FNTalker$("*CLS") ! Clear status registers and PRINT Return$ ! error queue. Return$=FNTalker$("SYST:REM ON") ! Enable remote operation.
  • Page 55 RETURN "Serial interface at Select Code "&VAL$(Sel_code)&" set up: "&VAL$(Baud)&", Err_trap: RETURN ERRM$ FNEND !============================================================== DEF FNTalker$(Output$) ! This function sends a command or query to the 5071A then retrieves ! the 5071A response. /Io/Prompt$[4],Term$[1],@Ser_in,@Ser_out,Timeout,INTEGER Com_port DIM Input$[2048],A$[1],Reply$[2048] ON DELAY Timeout,15 GOTO Hang ! 15 is highest priority.
  • Page 56 ENTER @Ser_in USING "#,B";Byte ! ! Enter one byte (character). Chars_in_queue=READIO(Com_port,31) END WHILE OUTPUT @Ser_out;Output$ WAIT .05 ! Wait 50 msec for 5071A ! to begin to respond. WHILE NOT Complete Chars_in_queue=READIO(Com_port,31) IF Chars_in_queue THEN ENTER @Ser_in USING "#,A";A$ ! Enter one character.

  • Page 57: Tips On Using The Rs-232C Port On The 5071A

    Refer to this manual for instructions on how to unlock the front panel. If this is not the case, the 5071A front panel can appear to be frozen (no key presses accepted) if it is communicating with another serial device through the RS-232C and receives a data holdoff from that device.

  • Page 58: Using Ctrl-Q In Programs

    Transmit and Data Receive). When DSR is false (negative voltage), data transmission from the 5071A will stop until the DSR is true again (positive voltage). If this line is not connected to any signal, then DSR is pulled positive inside the 5071A.
  • Page 59 FIGURE 5-1: 5071A Serial Configuration. Use the software in any PC with an RS-232 (COM) port connected to the 5071A as described in this manual. You can contact your local Microchip Sales Office by email or phone and request a copy to be sent to you by email.

  • Page 60: Chapter 6. Command Reference

    Table 6-1 and followed by SCPI com- mands in Table 6-2. Details of all 5071A SCPI commands can be found in the SCPI Subsystem Commands section following the SCPI Command summary. The SCPI command format, syntax, parameter and response types, and common com-...

  • Page 61: Scpi Commands

    5071A Primary Frequency Standard User’s Guide TABLE 6-1: IEEE 488.2 COMMON COMMANDS (CONTINUED) Mnemonic Command Name Function *IDN? Identification Query Returns Instrument identification string. Note the IDN command will not return the instru- ment serial number, and the field is hard coded with a 0.
  • Page 62 STATe] uled LPS. [SOURce]:PTIMe:LEAPsecond:[: Returns status of a — <0|1> STATe]? scheduled LPS. [SOURce]:PTIMe:SLEW <numeric_value> — Adjusts clock Epoch. Returns MIN/MAX [SOURce]:PTIMe:SLEW? [MIN|MAX] <NR3> acceptable Slew value. Sets/resets Standby [SOURce]:PTIMe:STANdby <OFF|0|ON|1> — mode.  2022 Microchip Technology Inc. DS50003249A-page 62...
  • Page 63 5071A Primary Frequency Standard User’s Guide TABLE 6-4: PRECISION TIME (DATE AND TIME) COMMANDS (CONTINUED) Response Command Parameter Form Comment Form Returns Standby mode [SOURce]:PTIMe:STANdby? — <0|1> status. [SOURce]:PTIMe: <OFF|FRONt| — Arms selected Sync port. SYNChronization REAR> [SOURce]:PTIMe: <OFF|FRON| Returns armed Sync —...
  • Page 64 Sets parity. PARity ODD> SYSTem:COMMunicate:SERial: <numeric value> — Sets number of stop bits. SBITs 1 or 2 SYSTem:COMMunicate:SERial: — <NR1> Returns baud rate. BAUD? SYSTem:COMMunicate:SERial: Returns number of data — <NR1> BITS? bits.  2022 Microchip Technology Inc. DS50003249A-page 64...

  • Page 65: Description Of Scpi Commands

    DIAGNOSTIC:CONTINUOUS:RESET This command resets the Continuous Operation light (illuminates continuously) if the instrument has triggered its warning mode. The 5071A must be in REMote mode to execute this command. If DIAG: CONT? is OFF, sending :CONT:RESet will generate error +202, "Valid only when oper- ating normally".
  • Page 66 Response format = <NR3>, precision = 1 x 10 6.2.1.8 DIAGNOSTIC:LOG:CLEAR This command purges all event log entries. The 5071A must be in REMote mode to execute this command. This command is not affected by *RST and does not have a query. 6.2.1.9 DIAGNOSTIC:LOG :COUNT? This query returns the number of entries in the log as an integer.
  • Page 67 DIAGNOSTIC:TEST? <NUMERIC_VALUE> This query executes the diagnostic test specified by the supplied parameter. The 5071A must be in Standby mode or Fatal error state to successfully execute this command, otherwise error message +203 "Valid only in standby" returns. Response format = <boolean> (0: tests passed, or 1: tests failed).

  • Page 68: Display Commands

    This command enables or disables the LED clock display. The display will illuminate if the time has been set. The 5071A must be in REMote mode to execute this command. REMote mode can be set ON by sending *RST. The available parameters are: •...

  • Page 69: Precision Time (Date And Time) Commands

    6.2.3.1 PTIME[:TIME] <HOUR>,<MINUTE>,<SECOND> This command sets time in 24-hour format (SCPI standard). The 5071A must be in REMote mode to execute this command. Requires three parameters: hours, minute, and second. Entered values are rounded to integer. The maximum range limits are 23, 59, 59, respectively.
  • Page 70 PTIME:SLEW <NUMERIC_VALUE> This command adjusts the epoch of the clock with the supplied parameter. The 5071A must be in REMote mode to execute this command. One parameter is required, accepts "S" suffix. Parameter range = –0.5 S to 0.5 S, precision = 50 ns.

  • Page 71: Reference Oscillator Commands

    6.2.4 Reference Oscillator Commands The [SOURce]:ROSCillator commands provides more advanced time keeping func- tions for the 5071A. These functions increase the flexibility of the 5071A by providing a means of: • Setting reference oscillator tuning voltage, • Setting fractional frequency offsets, •...

  • Page 72: Status Monitoring Commands

    Command Reference The 5071A must be in REMote mode to execute this command. The instrument maintains servo lock to the Cesium resonance. Parameter range = –1 x 10 to +1.0 x 10 The function of this command is set to 0.0 by *RST.
  • Page 73 5071A Primary Frequency Standard User’s Guide 6.2.5.2 USING THE OPERATION STATUS REGISTER The 16-bit Operation Status register monitors instrument operations currently being performed. The instrument implements bits 0, 8, 9, 10, 11, and 12 to monitor various internal operations. Refer to the Status Reporting section of this chapter for definitions of these bits.
  • Page 74 USING THE QUESTIONABLE DATA REGISTER The Questionable Data Register conveys information about the quality of the instru- ment's functions and outputs. The 5071A implements bits 2, 5, and 6 of the Question- able Data Register (refer to the Status Reporting section of this chapter for more details).

  • Page 75: System Commands

    5071A Primary Frequency Standard User’s Guide 6.2.5.11.3 STATus:QUEStionable:ENABle <numeric_value> This command sets QUEStionable enable register to the specified value. Meaningful values are in the range 0 to 32767. 6.2.5.11.4 STATus:QUEStionable:ENABle? This query reports the contents of the QUEStionable enable register, non destructively.
  • Page 76 — 6.2.6.3 SYSTEM:KEY? [MIN|MAX] This query returns the numeric code of the last keypress or minimum-maximum accept- able range limits. Does not reflect codes sent by the KEY command. Response format = <NR1>  2022 Microchip Technology Inc. DS50003249A-page 76...
  • Page 77 • Serial port: baud rate, data bits, stop bits, and parity • LCD angle • Output port frequencies • Printer report level The 5071A must be in REMote mode to execute this command. The function of this command is not affected by *RST. 6.2.6.8 SYSTEM:TIME <HOURS>,<MINUTES>,<SECONDS>...

  • Page 78: Status Reporting

    IEEE 488.2 Common commands. Refer to the next section of this chapter for information about, and examples of, programmed rear-panel Status Output states. The status registers of the 5071A are defined in the following tables.
  • Page 79 5071A Primary Frequency Standard User’s Guide TABLE 6-11: IEEE STANDARD EVENT STATUS REGISTER (ESR) Function Name OPC IEEE Operation complete RQC (not used) SCPI Query error SCPI Device Dependent Error SCPI Execution Error SCPI Command Error URQ (not used) PON Power On flag...

  • Page 80: Rear Panel Status Output Operation

    SCPI and IEEE common commands which control the status model to select which conditions will trigger the status output. After successful power-on and warm up, the 5071A will assert its status output active when the instrument leaves normal operation. This exit from normal operation may be programmed for a variety of conditions.
  • Page 81 5071A Primary Frequency Standard User’s Guide This example describes how to program the Status Output to go active when the 5071A is operating on its Internal-Standby Battery. According to the SCPI OPERation Status Register table, "On Battery" is bit "9". Bit 9 corresponds to decimal value 512.

  • Page 82: Serial-Port Command/Printer Interface

    6.5.4 End-Of-Line Characters The 5071A will receive lines terminated with CR (ASCII 13 decimal), LF (ASCII 10 dec- imal), or one followed immediately by the other, in either order. There is no support for IEEE 488 <EOI>. The instrument always terminates formatted output lines with <CR>...

  • Page 83: Error Messages/Codes

    5071A Primary Frequency Standard User’s Guide ERROR MESSAGES/CODES The following table lists and describes the error messages. TABLE 6-14: ERROR MESSAGES Number Error String Cause -100 Command error This is the generic syntax error used if the 5071A cannot detect more specific errors.
  • Page 84 SYSTem:REMote must be ON Requested entry not allowed when REMote is OFF. +202 Valid only when operating nor- Requested entry not allowed in current operat- mally ing state. +203 Valid only in Standby Requested entry not allowed in Normal operat- ing mode.  2022 Microchip Technology Inc. DS50003249A-page 84...
  • Page 85 5071A Primary Frequency Standard User’s Guide NOTES: DS50003249A-page 85  2022 Microchip Technology Inc.

  • Page 86: Chapter 7. Specifications

    • Provides complete remote control and interrogation of all instrument functions and parameters. RS-232C interface circuits are optically isolated and floating with respect to 5071A chassis. • Software command set: Standard commands for Programmable Instruments (SCPI), version 1990.0 adapted for RS-232C.

  • Page 87: Accessories And Options

    7.1.3.3 5071A OPTIONS • 5071A-908: Rack Flange Kit. Use for mounting the 5071A when front handles will not be used. Also available under part number WARNING: Do not mount this product by the rack flanges alone. Always use a shelf, rails, or slides.

  • Page 88: Specification Definitions

    In the 5071A, both Port 1 and Port 2 high isolation output frequencies are derived from the same source; there is no measurable change in frequency.
  • Page 89 5071A Primary Frequency Standard User’s Guide Technical Note 1337, Characterization of Clocks and Oscillators available from the Superintendent of documents, U.S. Government Printing Office, Washington D.C. 20402-9325. DS50003249A-page 89  2022 Microchip Technology Inc.

  • Page 90: Chapter 8. Installation

    The following section describes how to prepare to use the instrument. 8.2.1 Power Requirements The 5071A can operate from AC power sources of 100VAC, 120VAC, 220VAC, or 240VAC, 45 Hz to 66 Hz for all voltages, 400 (10%) Hz for 100VAC and 120VAC. Maximum AC power consumption is 100W, 140VA.

  • Page 91: Selecting Line Voltage And Fuse (For Units Delivered Prior To 23 August 2016)

    5071A to the power source as described in the following para- graphs. The 5071A is equipped with an AC power module (on the rear panel) that contains a turret wheel selector to select 100VAC, 120VAC, 220VAC, or 240VAC operation as...

  • Page 92: Ac Power Cabling

    Part number shown for plug is industry identifier for plug only. Number shown for cable is Part Number for complete cable including plug. E = Earth Ground, L = Line, N = Neutral  2022 Microchip Technology Inc. DS50003249A-page 92...

  • Page 93: Operating Environment

    The instrument has plastic feet for convenience in bench operation. The plastic feet are keyed to facilitate self-alignment when stacking instruments. WARNING The 5071A weighs 30 kg (66 lbs). Care must be taken when lifting the instrument to avoid personnel injury. Always use sliding rails or rack tray when rack mounting. 8.2.4.2 INSTALLING OPTIONS 908 AND 913 Options 908 and 913 facilitate rack-mount installation for the 5071A.
  • Page 94 As Req’d Staples Perform the following steps to package the 5071A for shipment: 1. Pack the instrument as shown in the following illustration. Use the instructions provided with the packing kit. (You do not need to return the manual and power cord.)

  • Page 95: Operator's Maintenance

    DC Input" connector. WARNING The 5071A runs from AC power when both AC and DC power are available. The 5071A will not run from DC power unless the AC power source fails or is disconnected. 48V Option: In addition to AC power capability, the 5071A can also be operated from an external DC source with a voltage range of ±40VDC to 58VDC, 100W maximum...

  • Page 96: Replacing The External Dc Input Power Fuse

    INTERNAL STANDBY BATTERY MAINTENANCE Note: This section does not apply for 48V option instruments. The 5071A uses two, sealed, 12-volt lead-acid battery packs as an internal back-up power source. These battery packs are designed specifically for use with the 5071A.

  • Page 97: Battery Operating Temperatures

    The battery pack(s) is designed for use between –40°C and +65°C. At 25°C, the 5071A is specified to operate for at least 45 minutes. At 0°C, the 5071A will typically operate for approximately 50 minutes. At 55°C, the instrument operates between 60 and 75 minutes.

  • Page 98: Battery Disposal

    CAUTION The 5071A should NOT be operated in a gas-tight enclosure, to minimize the possibility of any hazardous accumulation of hydrogen gas associated with battery overcharging or failure. The possibility of such gaseous accumulation during normal operating cir- cumstances is very remote but requires care as a preventive measure.

  • Page 99: Cesium Beam Tube Replacement

    Never store the 5071A longer than six months without periodic (or continuous) operation. You can safely store the 5071A for extended periods of time by leaving the instrument connected to AC power and placing it into the Standby Mode of operation. Refer to Configuring the 5071A for details.

  • Page 100: Appendix A. Performance Tests

    Only the power on self tests and the RS-232 remain in the document as the information previously included was significantly out of date or required specialized equipment that was not readily available for many customers. The 5071A does not require mainte- nance or calibration during its operating life.

  • Page 101: Rs-232 Serial Port Verification

    RS-232 SERIAL PORT VERIFICATION 1. Ensure that the correct hardware connections exist between the 5071A and your terminal, personal computer, or workstation for your remote operation needs. 2. Ensure that the 5071A and your data communications equipment (terminal) are powered-up and have passed their own self-tests.

  • Page 102: Appendix B. Product Variations

    BNC connector for 1 PPS output and Sync input are still present. All communication and control of the 5071A is done through the rear-panel RS-232 (serial) port. 046: This option removes the internal 45-minute standby batteries. The 5071A will only operate on AC mains or external nominal +24VDC power.
  • Page 103 5071A Primary Frequency Standard User’s Guide NOTES: DS50003249A-page 103  2022 Microchip Technology Inc.

  • Page 104: Appendix C. Glossary

    In the 5071A, both the Port 1 and Port 2 high isolation output frequencies are derived from the same source; there is no mea- surable change in frequency.
  • Page 105 • Working: The standard against which instruments are compared for test or repair purposes. Settability The degree to which the frequency of the 5071A may be adjusted to corre- spond with a reference without loss of stability. Time Domain Stability (also called short-term stability); The standard deviation of fractional frequency fluctuations in the specified output signal due to random noise in the cesium standard.

  • Page 106: Worldwide Sales And Service

    Tel: 46-31-704-60-40 Tel: 631-435-6000 Sweden - Stockholm San Jose, CA Tel: 46-8-5090-4654 Tel: 408-735-9110 UK - Wokingham Tel: 408-436-4270 Tel: 44-118-921-5800 Canada - Toronto Fax: 44-118-921-5820 Tel: 905-695-1980 Fax: 905-695-2078 DS50003249A-page 106  2022 Microchip Technology Inc. and its subsidiaries 09/14/21...

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