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Symmetricom Z3801A User Manual

Symmetricom Z3801A User Manual

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097-Z3801-01
Issue 1: May 00
Z3801A

GPS Receiver

User's Guide
Copyright © 2000 Symmetricom, Inc. All rights reserved. Printed in U.S.A.

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Summary of Contents for Symmetricom Z3801A

  • Page 1: Gps Receiver

    097-Z3801-01 Issue 1: May 00 Z3801A GPS Receiver User’s Guide Copyright © 2000 Symmetricom, Inc. All rights reserved. Printed in U.S.A.
  • Page 2 This guide describes how to install and operate the Warning Symbols That May Be Used In This Book Z3801A GPS Receiver. The information in this guide applies to instruments having the number prefix listed below, unless accompanied by a “Manual Updating Changes” package indicating otherwise.

  • Page 3: Table Of Contents

    Available Documents ..............xi Getting Started Z3801A Front Panel at a Glance..........1-2 Z3801A Rear Panel at a Glance ..........1-3 Preparing the GPS Receiver for Use ........1-4 To Assemble and Install the Antenna System ......1-4 To Assemble the DC Power Connector........1-5 Powering Up the Receiver............
  • Page 4 Contents Features and Functions Chapter Contents ................ 2-2 Inputs ..................... 2-3 ANTENNA Input ..............2-3 Recommended Antenna Cable Assemblies ......2-3 Antenna Cable Length Delay ..........2-5 DC INPUT J4 Power Jack ............2-6 Outputs ..................2-7 10 MHz OUT J2 Output ............2-7 10 MHz Outputs—via I/O Port 1 J3.........
  • Page 5 HEALTH MONITOR Section of the Screen......3-18 The Receiver Status Screen at a Glance ......3-19 Command Listing and Status Information Chapter Contents ................ 4-2 Z3801A Commands ..............4-3 SCPI Conformance Information ..........4-3 SCPI Syntax Conventions............4-3 Description of Commands ............4-3 Detailed Description of the Two Time Code Formats ...
  • Page 6 Contents User Guide...

  • Page 7: In This Guide

    Chapter 4, “Command Listing and Status Information,” briefly lists all of the commands that can be used to operate the Receiver and provides Receiver status and error message information. Chapter 5, “Specifications Summary,” lists the Z3801A specifications and characteristics. Index...

  • Page 8: Description Of The Z3801A Gps Receiver

    (Alarm), and two LEDs illuminated under user-defined conditions (Enabled, Active). The Z3801A has no front panel display or keypad entry. Information is remotely entered into and retrieved from the Z3801A using customer- supplied DCE (Digital Communications Equipment) connected to the rear-panel 25-pin RS-422 serial interface port.

  • Page 9: Options

    In This Guide Options • Rack Mount Tray 29.5 inch (750-millimeter) • CV90-14271-1 GPS Receiver Unit, +27 Vdc, beige, single output • CV90-14271-2 GPS Receiver Unit, --54 Vdc, beige, single output • CV90-14271-11 GPS Receiver Unit, -+27 Vdc, gray, single output •...
  • Page 10 In This Guide • 58518A RG-213 Antenna Cable Assembly (3.3 to 164.0 ft, or 1 to 50 meters)—TNC-to-N connectors • 58519A RG-213 Interconnect Cable Assembly (3.3 to 164.0 ft, or 1 to 50 meters)—N-to-N connectors • 58520A LMR 400 Antenna Cable Assembly (3.3 to 360.8 ft, or 1 to 110 meters)—TNC-to-N connectors •...

  • Page 11: Manuals

    In This Guide Manuals Supplied Manual Z3801A User’s Guide (this guide), P/N Z3801-01 User Guide...
  • Page 12 In This Guide User Guide...

  • Page 13: Getting Started

    Getting Started...

  • Page 14: Z3801A Front Panel At A Glance

    Chapter 1 Getting Started Z3801A Front Panel at a Glance Z3801A Front Panel at a Glance GPS RECEIVER I N C O R P O R A T E D Power Enabled Active Alarm GPS Lock 1 When the Power indicator is illuminated, it...

  • Page 15: Z3801A Rear Panel At A Glance

    Chapter 1 Getting Started Z3801A Rear Panel at a Glance Z3801A Rear Panel at a Glance ANTENNA DC INPUT 10 MHz OUT SERIAL PLATE CV90 - 15357 - 1 19.5 - 30VDC Made in U.S.A. with domestic and foreign content.

  • Page 16: Preparing The Gps Receiver For Use

    Chapter 1 Getting Started Preparing the GPS Receiver for Use Preparing the GPS Receiver for Use To Assemble and Install the Antenna System CABLE CONSIDERATIONS. When using the antenna cables with the GPS Receiver, you should observe certain precautions. Consult your local electrical and building ordinance codes on how to install RG-213 cables (58518A/519A) or LMR 400 cables (58520A/521A).
  • Page 17 Chapter 1 Getting Started Preparing the GPS Receiver for Use battery’s return (ground) wire to pin 3. Use the rear-panel E1 ground stud to connect the GPS Receiver chassis to a system ground. 3 Observing the correct polarity, attach the other ends of the wires to a proper dc power source to operate the Receiver.

  • Page 18: Powering Up The Receiver

    Chapter 1 Getting Started Powering Up the Receiver Powering Up the Receiver Overview of the Power-Up Procedure (What to Expect) When you power up the GPS Receiver for the first time, you should expect it to run through the following sequence: •...
  • Page 19 Chapter 1 Getting Started Powering Up the Receiver Do not apply power to the Receiver unless a fully operational antenna NOTE system is connected to the rear-panel ANTENNA J1 connector. Power applied with no antenna input can initiate an extended search process that may increase time to reach GPS lock.
  • Page 20 Chapter 1 Getting Started Powering Up the Receiver 4 Set the RS-422 port of your DCE device (or PC) to match the following values: Pace: NONE Baud Rate: 19200 Parity: Data Bits: 7/char Start Bits: Stop Bits: NOTE The RS-422 port configurations of the Receiver and the DCE device/PC must be the same for communications between the two.
  • Page 21 Chapter 1 Getting Started Powering Up the Receiver e. From the DCE device keyboard, type :SYSTEM:STATUS? and press Enter (or Return). Confirm that the scpi> prompt is displayed after pressing Return. If no prompt or an error-number prompt (E-xxx>) is displayed, then try typing the command again.

  • Page 22: To Understand The Receiver Status Screen Data

    Chapter 1 Getting Started Powering Up the Receiver Receiver Status ---------------------------- ---------------------------- SYNCHRONIZATION ......[ Outputs Valid/Reduced Accuracy ] Reference Outputs SmartClock Mode Locked to GPS: stabilizing frequency... TFOM >> Recovery FFOM Holdover 1PPS TI +20 ns relative to GPS Power-up HOLD THR 1.000 us...

  • Page 23: Installing The Automated Satstat Program For Continual Status Updates

    Chapter 1 Getting Started Installing the Automated SatStat Program for Continual Status Updates Installing the Automated SatStat Program for Continual Status Updates This Windows application provides continual status updates of the Receiver Status screen. Your PC must be equipped with a correctly wired (See Table 2-3 in Chapter 2.) RS-422 serial-port adapter and have Windows installed to operate the user interface application.

  • Page 24: Operating The Automated Satstat Program

    Chapter 1 Getting Started Operating the Automated SatStat Program Operating the Automated SatStat Program 1 Select CommPort, then choose Port Open. The main form of the Receiver Status screen is displayed. The program will send some commands to the GPS Receiver and then the main form should begin to periodically update every few seconds.

  • Page 25: Customizing The Receiver Operation

    Chapter 1 Getting Started Customizing the Receiver Operation Customizing the Receiver Operation Here are some key things you might want to perform to customize the Receiver operation: • Execute a system preset if you've found the Receiver in an unknown or questionable operating state. •...

  • Page 26: Using Commands To Control Key Functions (Examples)

    Chapter 1 Getting Started Using Commands to Control Key Functions (Examples) Using Commands to Control Key Functions (Examples) The operation of the GPS Receiver is designed to be as automatic as possible. However, there are several situations where serial interface control is required.

  • Page 27: Initiate "Surveying", An Automatic Determination Of The Receiver's Antenna Position

    Chapter 1 Getting Started Using Commands to Control Key Functions (Examples) Initiate “surveying”, an automatic determination of the Receiver’s antenna position. When “position survey” is invoked, the Receiver is set to ascertain the position of its antenna automatically. This survey is important; correct antenna position data is required for the Receiver to deliver specified performance.

  • Page 28: Set The Receiver To Exclude Satellites Which Appear Below A Specified Elevation Angle

    Chapter 1 Getting Started Using Commands to Control Key Functions (Examples) Set the Receiver to exclude satellites which appear below a specified elevation angle. At the factory, and whenever the Receiver is preset, the Receiver is set to seek satellites visible from zenith down to 10 degrees above the horizon—down to an “elevation mask angle”...
  • Page 29 Chapter 1 Getting Started Using Commands to Control Key Functions (Examples) Set the latitude, longitude, and height parameters to represent the latitude (in degrees, minutes, seconds), longitude (in degrees, minutes, seconds), and altitude in meters above mean sea level (MSL). (Note: if you know the position to this accuracy, the desired position is of the antenna rather than the Receiver.) For faster acquisition following repair, or power failure you may want...
  • Page 30 Chapter 1 Getting Started Using Commands to Control Key Functions (Examples) 1-18 User Guide...
  • Page 31 Features and Functions...

  • Page 32: Features And Functions Chapter Contents

    Chapter Contents You will find that this section makes it easy to look up all the details about a particular feature of the Z3801A GPS Receiver. This chapter provides inputs, outputs, indicators, terminal and computer connections, operating concepts (GPS lock and holdover), and problem-solving information.

  • Page 33: Inputs

    Chapter 2 Features and Functions Inputs Inputs ANTENNA Input The N-type (female) ANTENNA connector allows you to connect the 58504A or 58513A Antenna Assembly. The antenna assemblies are “active” antennas; a “passive” antenna will not work with the Receiver. Integral to the antenna assembly is a low noise amplifier (LNA) that is provided for Receiver operation with antenna cable lengths up to 378 feet (115.2 meters) for LMR 400 cables or 175 feet (53.3 meters)
  • Page 34 Chapter 2 Features and Functions Inputs LMR 400 Cable Line Amplifier Requirements If cable length between GPS Receiver and antenna is: • Less than 115 meters (377 feet), no line amplifier is necessary. • More than 115 meters (377 feet) and less than 240 meters (787 feet), you need 1 line amplifier.

  • Page 35: Antenna Cable Length Delay

    Chapter 2 Features and Functions Inputs Antenna Cable Length Delay The RG 213 propagation delay is 1.54 nanoseconds per foot (5.05 ns/meter). The LMR 400 propagation delay is 1.2 nanoseconds per foot (3.93 µs/meter). Given these delay values per foot you can calculate the delay for your cable length.

  • Page 36: Dc Input J4 Power Jack

    Chapter 2 Features and Functions Inputs Table 2-1B. Delay Values for the 58520A/521A and 58520AA/521A LMR 400 Antenna Cables Cable Option Length LMR 400 Antenna Delay Value 3.3 ft (1m) 3.9 nanoseconds 6.7 ft (2 m) 8.0 nanoseconds 16.4 ft (5 m) 19.6 nanoseconds 32.8 ft (10 m) 39.3 nanoseconds...

  • Page 37: Outputs

    Chapter 2 Features and Functions Outputs Outputs 10 MHz OUT J2 Output This is a 10 MHz output reference signal traceable to UTC (USNO) that can be used for synchronizing CDMA test equipment. 10 MHz Outputs—via I/O Port 1 J3 Two additional 10 MHz synchronization signals are available through the I/O Port 1 J3 connector.

  • Page 38: Rs-422 Serial Port, I/O Port 1 J3

    Chapter 2 Features and Functions Outputs RS-422 Serial Port, I/O Port 1 J3 The 25-pin female D Subminiature (DB-25) connector located on the rear panel provides RS-422 serial communications capability. This can be used by connecting a DCE device with an RS-422 serial interface port (wired to interface with the receiver's I/O port as listed in Table 2-3) and suitable terminal emulation software, then sending the correct commands for transmitting or retrieving data.

  • Page 39: Indicators

    Chapter 2 Features and Functions Indicators Indicators Power Indicator This indicator lights when the input power is supplied to the Receiver. Enabled/Active Indicator These user definable indicators light when turned on through the RS-422 serial interface port. Alarm Indicator The Receiver lights this indicator to indicate it has detected an internal condition that requires attention.

  • Page 40: Connecting To A Computer

    The GPS Receiver is considered the Data Terminal Equipment (DTE) for this interface. The Z3801A rear-panel serial interface port has a fixed configuration as described in Chapter 1 of this guide on page 1-3.

  • Page 41: Operating Concepts

    Chapter 2 Features and Functions Operating Concepts Operating Concepts General The time required to acquire GPS lock as described in the following paragraph can vary significantly depending on your local conditions. In general, we strongly recommends that your antenna and cables be set up in accordance with the information provided in this guide prior to using the output signals of the Receiver to ensure they are valid.

  • Page 42: In Case Of A Problem

    Chapter 2 Features and Functions In Case of a Problem In Case of a Problem Hours after powerup, Receiver not establishing GPS lock Date, time, and position still show power-up defaults, or these SYMPTOM parameters are incorrect. Receiver Position Mode = Survey. Receiver cycling from one set of satellites to another.

  • Page 43: Receiver Not Maintaining Gps Lock

    Chapter 2 Features and Functions In Case of a Problem 1 Tee-connector 2 DVM Figure 2-1. Measuring +5 Volts Across Antenna Input Same as previous symptoms, except Receiver Position Mode = Hold. SYMPTOM Enable SURVEY mode using specified command. SOLUTION Receiver not maintaining GPS lock Position data incorrect.
  • Page 44 Chapter 2 Features and Functions In Case of a Problem 2-14 User Guide...
  • Page 45 Using the Receiver Status Screen...

  • Page 46: Using The Receiver Status Screen Chapter Contents

    Chapter 3 Using the Receiver Status Screen Chapter Contents Chapter Contents This chapter provides a tutorial section on how to use the Receiver Status screen, a comprehensive reference information section, and an illustrated foldout of the Receiver Status screen, which is a comprehensive summary of key operation conditions and settings.

  • Page 47: Using And Reading The Receiver Status Screen

    Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen Using and Reading the Receiver Status Screen The Receiver Status screen can be accessed when the GPS Receiver is connected to a properly configured terminal or PC. There are two ways to access and use the Receiver Status screen: •...

  • Page 48: Tutorial On Using The Status Screen To Interface With The Receiver

    Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen Tutorial on Using the Status Screen to Interface With the Receiver Type :SYSTEM:STATUS? at the scpi> prompt. An initial power-up screen is displayed, which is similar to the demonstration screen shown in Figure 3-1.
  • Page 49 Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen An accurate position is necessary to derive precise time from GPS. The Position quadrant indicates that the Receiver is in survey mode, which uses GPS to determine the position of the GPS antenna. This process has not yet started, since position calculations can be performed only while tracking four or more satellites.
  • Page 50 Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen An asterisk (*) next to the PRN of a satellite in the Not Tracking column indicates the Receiver is attempting to track it. The elevation (El) and azimuth (Az) angles of the satellite are indicated. Acq . or Acq.. tell you that the Receiver is attempting to track that satellite.
  • Page 51 Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen Receiver Status ---------------------------- ---------------------------- SYNCHRONIZATION ......[ Outputs Valid/Reduced Accuracy ] Reference Outputs SmartClock Mode TFOM FFOM >> Locked to GPS: stabilizing frequency Recovery 1PPS TI +20 ns relative to GPS Holdover HOLD THR...

  • Page 52: Demonstration Of Holdover Operation

    Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen Demonstration of Holdover Operation The Receiver typically reaches stable state 24 hours after powerup, CAUTION and it will learn best if its experiences no holdover in the first 24 hours. Therefore, the holdover demonstration in the following paragraphs will compromise the Receiver’s ability to learn the characteristics of its internal reference oscillator.
  • Page 53 Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen Receiver Status ---------------------------- ---------------------------- SYNCHRONIZATION ......[ Outputs Valid/Reduced Accuracy ] Reference Outputs SmartClock Mode TFOM FFOM Locked to GPS Recovery 1PPS TI Holdover: GPS 1PPS invalid >>...

  • Page 54: User Guide

    Chapter 3 Using the Receiver Status Screen Using and Reading the Receiver Status Screen Receiver Status ---------------------------- ---------------------------- ......[ Outputs Valid/Reduced Accuracy ] SYNCHRONIZATION Reference Outputs SmartClock Mode TFOM FFOM >> Locked to GPS: Stabilizing frequency Recovery 1PPS TI +10.6 ns relative to GPS Holdover HOLD THR 1.000 us...

  • Page 55: Receiver Status Screen Data

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data Receiver Status Screen Data This section defines the data displayed in the Receiver Status screen, shown in Figure 3-6. Receiver Status ---------------------------- ---------------------------- SYNCHRONIZATION .......... [ Outputs Valid ] Reference Outputs SmartClock Mode >>...

  • Page 56: Synchronization Section Of The Status Screen

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data SYNCHRONIZATION Section of the Status Screen SYNCHRONIZATION Summary Line The SYNCHRONIZATION line in the screen summarizes the SmartClock Status and Reference Outputs. One of three SYNCHRONIZATION messages is shown: Outputs Invalid while the Receiver (unit) is warming up, while the unit is in holdover or is locked but has not...

  • Page 57: Reference Outputs

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data When the manually initiated message follows the Holdover label, the Receiver has been placed in holdover by the user. An explicit command is required to initiate an exit from manual holdover. When the 1 PPS TI exceeds hold threshold message follows the Holdover label, the phase difference between the 1 PPS time output signal and the internal GPS 1 PPS reference signal has exceeded the...

  • Page 58: Acquisition Section Of The Status Screen

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data FFOM (Frequency Figure of Merit) indicates the stability of the Receiver’s 10 MHz output. The 10 MHz output is controlled by the SmartClock’s Phase-Locked Loop (PLL). Thus, the FFOM value is determined by monitoring the status of the PLL.

  • Page 59: Tracking, Not Tracking

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data Tracking, Not Tracking The Tracking table indicates the number of satellites the unit is tracking. The Not Tracking table indicates satellites predicted to be visible that are not tracked, and all of the satellites that are assigned to a GPS Engine channel but are not currently tracked.

  • Page 60: Time

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data Time When you first power up the unit the time and date that is stored in the internal GPS Engine may not be the actual date. The actual time and date will be valid after one satellite has been tracked by the Receiver.

  • Page 61: Position

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data Position Position area of the status screen provides four types of information: MODE (hold or survey), LAT (latitude), LON (longitude), and HGT (height). MODE indicates whether the unit is set to Hold or Survey position mode. When Hold is displayed, the unit’s antenna position has been provided by the user, or the average position has been found after completion of survey.

  • Page 62: Health Monitor Section Of The Screen

    Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data HEALTH MONITOR Section of the Screen The HEALTH MONITOR section of the status screen reports errors or failures of the key hardware functions. The OK summary message at the end of the HEALTH MONITOR line indicates that no errors or failures were detected.
  • Page 63 Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data User Guide 3-19...

  • Page 64: The Receiver Status Screen At A Glance

    Chapter 3 Using the Receiver Status Screen The Receiver Status Screen at a Glance The Receiver Status Screen at a Glance Receiver St ---------------------------- SYNCHRONIZATION SYNCHRONIZATION ......SmartClock Mode SYNCHRONIZATION profiles the process of synchronizing Locked time and frequency reference signals with GPS. >>...
  • Page 65 Chapter 3 Using the Receiver Status Screen The Receiver Status Screen at a Glance ceiver Status ---------------------------- ACQUISITION ..[ Outputs Valid/Reduced Accuracy ] Reference Outputs ACQUISITION profiles the process of acquiring precise time from TFOM FFOM GPS. GPS provides time-of-day information and a 1PPS reference +1.296 us] 1PPS TI signal used to discipline the internal oscillator.
  • Page 66 Chapter 3 Using the Receiver Status Screen The Receiver Status Screen at a Glance 3-22 User Guide...
  • Page 67 Command Listing and Status Information...

  • Page 68: Command Listing And Status Information Chapter Contents

    Chapter 4 Command Listing and Status Information Chapter Contents Chapter Contents This chapter provides a description of each command that can be used to operate the Z3801A GPS Receiver. This chapter is organized as follows: • Z3801A Commands page 4-3 –...

  • Page 69: Z3801A Commands

    Z3801A Commands Z3801A Commands SCPI Conformance Information The Standard Commands for Programmable Instruments (SCPI) commands used in the Z3801A are in conformance with the SCPI Standard Version 1994.0. SCPI Syntax Conventions An element inside brackets is optional. Note, the brackets are NOT part of the command and should NOT be sent to the Receiver.
  • Page 70 Chapter 4 Command Listing and Status Information Z3801A Commands Refer to the 58503B/59551A GPS Receivers Operating and Programming Guide (58503-90013) for detailed descriptions of commands listed in tables 4-1 and 4-2. Table 4-1. Z3801A INSTALL Commands Keyword/Syntax Parameters/ Comments Responses *CLS Clear errors.
  • Page 71 Chapter 4 Command Listing and Status Information Z3801A Commands Table 4-2. Z3801A PRIMARY Commands (continued) Keyword/Syntax Parameters/ Comments Responses :DIAGnostic Node Only :IDENtification Node Only. :GPSystem? returns a sequence of Returns the model number, serial number, and quoted strings revision of the internal GPS receiver.
  • Page 72 Chapter 4 Command Listing and Status Information Z3801A Commands Table 4-2. Z3801A PRIMARY Commands (continued) Keyword/Syntax Parameters/ Comments Responses [SOURce]:PTIMe Node Only :FFOMerit? returns INT Frequency figure of merit. Generates an error (−230, Data corrupt or stale) when this value is unavailable.
  • Page 73 Chapter 4 Command Listing and Status Information Z3801A Commands Table 4-2. Z3801A PRIMARY Commands (continued) Keyword/Syntax Parameters/ Comments Responses [SOURce]:PTIMe (Cont.) :GPSystem (Cont.) :POSition (Cont.) :SURVey (Cont.) Node Only :PROGress? returns INT in % During survey, provides % completed (from survey start until automatic transition to position hold).

  • Page 74: Detailed Description Of The Two Time Code

    Chapter 4 Command Listing and Status Information Z3801A Commands Table 4-2. Z3801A PRIMARY Commands (continued) Keyword/Syntax Parameters/ Comments Responses [SOURce]:PTIMe (Cont.) :LEAPsecond :ACCumulated? returns INT Identifies accumulated time difference (in seconds) between GPS and UTC time scales. :GPSTime? returns INT in HEX GPS time of next pending leapsecond.
  • Page 75 Chapter 4 Command Listing and Status Information Z3801A Commands Table 4-2. Z3801A PRIMARY Commands (continued) Keyword/Syntax Parameters/ Comments Responses [SOURce]:ROSCillator (Cont.) :HOLDover (Cont.) :RECovery (Cont.) :LIMit Node Only. :IGNore Action only. Causes transition in holdover state from waiting-to-recover to recovering when the reason this transition isn't taking place is due to the TI limit being exceeded.
  • Page 76 Chapter 4 Command Listing and Status Information Z3801A Commands Table 4-2. Z3801A PRIMARY Commands (continued) Keyword/Syntax Parameters/ Comments Responses :STATus Node Only. :OPERation Node Only. :CONDition? returns register value :ENABle <mask value> [:EVENt]? returns register value :HARDware Node Only. (See table in “Status Information”...
  • Page 77 Chapter 4 Command Listing and Status Information Z3801A Commands Table 4-2. Z3801A PRIMARY Commands (continued) Keyword/Syntax Parameters/ Comments Responses :STATus (Cont.) Node Only :PRESet :ALARm Presets the status/alarm reporting system to generate an alarm when one or more factory-default operating conditions occurs.

  • Page 78: Detailed Description Of The Two Time Code Formats

    Chapter 4 Command Listing and Status Information Z3801A Commands Detailed Description of the Two Time Code Formats The :PTIMe:TCODe? time code query returns an ASCII string that begins with “T1” or “T2” followed by the time of the next 1 PPS pulse, measures of the accuracy and stability of reference signals, and service-request status.
  • Page 79 Chapter 4 Command Listing and Status Information Z3801A Commands T1 or T2 is a literal, two-character header that identifies the format of the message. [T1 format] is a literal, two-character prefix of the unsigned hexadecimal number that follows. xxxxxxxx is the date and time of the next 1 PPS pulse, referenced to GPS Time, expressed as the number of seconds that have elapsed since January 6, 1980.

  • Page 80: Status Information

    Chapter 4 Command Listing and Status Information Status Information Status Information Listed below are the specific bit assignments for the status registers that have assignments that are customized by the timing Receiver. See Figure 4-1 for a simplified illustration of the relationships between the Status Registers.

  • Page 81: Questionable Status Register Bit Assignments

    Chapter 4 Command Listing and Status Information Status Information Questionable Status Register Bit Assignments = Positive Transition = Negative Transition = Enable = Alarm LED Information Reported Comments Time has been set. Event only This could occur after an extensive holdover period.

  • Page 82: Powerup Status Register Bit Assignments

    Chapter 4 Command Listing and Status Information Status Information Powerup Status Register Bit Assignments = Positive Transition = Negative Transition = Enable = Alarm LED Information Reported Comments First satellite tracked Condition = 1 when first satellite becomes tracked following powerup. Oscillator oven warmed up This bit sets when the internal oscillator has warmed up following powerup.

  • Page 83: Hardware Status Register Bit Assignments

    Chapter 4 Command Listing and Status Information Status Information Hardware Status Register Bit Assignments = Positive Transition = Negative Transition = Enable = Alarm LED Information Reported Comments (NOTE: For every bit in this register, STAT:PRES or SYST:PRES will cause an alarm to be generated if the bit sets) Selftest failure.

  • Page 84: Information That Appears In The Diagnostic Log

    Chapter 4 Command Listing and Status Information Information that Appears in the Diagnostic Log Information that Appears in the Diagnostic Significant events are logged by the timing Receiver. Each entry contains a brief description of the event and a time of occurrence. See the DIAG:LOG command node for commands that allow control and retrieval of logged information.

  • Page 85: Model For Powerup, Locked, And Holdover States

    Chapter 4 Command Listing and Status Information Model for Powerup, Locked, and Holdover States Model for Powerup, Locked, and Holdover States Figure 4-2 provides a model for thinking about the relationships between powerup, locked, and holdover operation of the Receiver. This model is consistent with commands that allow these states to be evaluated (e.g., see :ROSC:STATe?).
  • Page 86 Chapter 4 Command Listing and Status Information Model for Powerup, Locked, and Holdover States Powerup Holding ROSC:HOLD:INIT lock condition satisfied ROSC:HOLD:INIT Locked ROSC:HOLD:REC:INIT lock condition ROSC:HOLD:INIT Recovering satisfied external conditions Waiting external conditions Recover external conditions Holdover Operation Figure 4-2. Model of Relationships Between Powerup, Locked, and Holdover Operation of the Receiver 4-20 User’s Guide...

  • Page 87: Error Messages

    Chapter 4 Command Listing and Status Information Error Messages Error Messages Number Error String Cause No Error The error queue is empty. Every error in the queue has been read (:SYSTem:ERRor? query) or the queue was cleared by power-on or *CLS. -100 Command error This is the generic syntax error used if the Receiver cannot...
  • Page 88 Chapter 4 Command Listing and Status Information Error Messages Number Error String Cause -141 Invalid character data The character data element contains an invalid character. -148 Character data not allowed A legal character data element was encountered where prohibited by the Receiver. -150 String data error This error can be generated when parsing a string data...
  • Page 89 Chapter 4 Command Listing and Status Information Error Messages Number Error String Cause -330 Self-test failed Indicates at least one failure occurred when *TST? or :DIAG:TEST? was executed. -360 Communication error This is the generic communication error for devices that cannot detect the more specific errors described for errors -361 through -363.
  • Page 90 Chapter 4 Command Listing and Status Information Error Messages 4-24 User’s Guide...

  • Page 91: Specifications Summary

    Specifications Summary...

  • Page 92: Specifications And Characteristics

    Chapter 5 Specifications Summary Specifications and Characteristics Specifications and Characteristics The specifications and characteristics of the Z3801A GPS Time and Frequency Reference Receiver are provided in this chapter. GPS Receiver Features Six-channel, parallel tracking GPS engine C/A Code, L1 Carrier SmartClock™...

  • Page 93: Pps Output Characteristics

    Antenna and Cabling Information The 58504A Antenna Assembly is recommended to ensure specified performance. Power Requirements (supplied by the Z3801A): 5 Volts nominal; 50 ma maximum. Antenna Cable: 200 feet Cables are Belden 9913 with a type N connector one end and a type TNC connector on the other.

  • Page 94: Environmental

    Surge withstand: Meets IEEE/ANSI C37.90, C37.90.1, C37.90.2 Other Information The standard Z3801A does not include a display or a keypad. While not necessary, it may be convenient to track the Receiver’s progress during installation and startup by monitoring the satellites being tracked, location (position), time and other parameters.
  • Page 95 Index NUMERICS commands, examples 1-14 compensating for antenna cable 1 PPS output delay 1-15 1 PPS output configuration guide 1 PPS output synchronization 1-14 configuration, DCE device or PC 10 MHz OUT J2 connector 2-10 10 MHz output conformance 10 MHz reference output 1-14 SCPI 10811 oven reference oscillator...
  • Page 96 Index GPS Lock indicator interface cable 2-10 GPS status internal reference oscillator GPS time 3-16 ground plane latitude 1-17 ground stud guide organization Active Alarm HEALTH MONITOR 3-11 Enabled health monitor screen 3-11 GPS Lock height 1-17 Holdover help from HP Power Hold position mode 3-17...
  • Page 97 1PPS connection wiring SmartClock receiver SmartClock Mode 3-12 antenna cable delay SmartClock’s PLL 3-14 compensation 1-15 specifications command syntax conventions HP Z3801A controlling functions via Standard Event Register 4-14 commands 1-14 Status Registers customizing operation 1-13 Hardware Status 4-17 degraded timing performance...
  • Page 98 Index wiring, dc-power input Index-4 User Guide...

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