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Symmetricom 58502A 58502A Calibration (Option 010 Only), 58502A Calibration (Option 010 Only)

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NOTE

NOTE

Chapter 2 Performance Tests

58502A Calibration (Option 010 Only)58502A Calibration (Option 010 Only)

This section provides procedures to perform routine periodic calibration of the Option 010 Broadband Distribution Amplifier.

Overview

The following procedure uses software commands to calibrate the oscillator.

The optional oscillator of the 58502A has a specified aging rate of

±5 ⋅ 10−10 per day (±1 ⋅ 10−7/year). Refer to the specifications in Chapter 7 to ensure that the 58502A oscillator has warmed up for a sufficient period of time to make this adjustment.

When attempting to calibrate the 58502A with the SCPI software commands, you will need to establish serial communication via a terminal or PC.

Frequency adjustments can be made after determining the internal oscillator frequency error of the 58502A. The basic 10 MHz oscillator frequency can be adjusted as required to obtain the desired frequency using the software, SCPI-based EFC adjust that has a control range of 2 ⋅ 10−6 maximum with a minimum resolution of 4 ⋅ 10−12.

The software EFC control range is mapped onto a numerical range of values as follows:

Minimum: 0

Maximum: 1,048,575 (220-1)

Mid-Range: 524,288

Default Step Size: 10,000

Minimum Step Size: 1

Maximum Step Size (LIMIT ON): 35,000

2-16	User’s Guide

Contents

Page Page In This Guide 1 Getting Started Performance Tests Features and Functions Command Reference Functional Description 6 Service 7 Specifications Index Guide Organization Table of Contents Getting Started Performance Tests Guide Organization Description of the 58502A Broadband Distribution Amplifier OUTPUTS 1-12) INPUTS A Auto-Switchingand Alarm-InputsFeatures Accessories Supplied and Available Supplied Manuals Page Getting Started 58502A Broadband Distribution Amplifier at a Glance 58502A Broadband Distribution Amplifier at a Glance NOTE Power Alarm Input A OUTPUT STATUS Preparing the Distribution Amplifier for Use To Mount the 58502A Into an Equipment Rack (Using Option AX4) Figure 1-1.Attaching Mounting Brackets for Equipment Rack Connecting a Terminal or Computer to the 58502A To Connect AC Power Connecting a Terminal or Computer to the 58502A Figure 1-2.Connecting a PC or Terminal to the 58502A Page To Configure Terminal Communications for NT 4.0®/Windows® 95-BasedPC Start Programs Accessories Windows®-BasedPC 2Select Settings, then choose Communications Communications Powering Up the Distribution Amplifier Powering Up the Distribution Amplifier Overview of the Power-UpProcedure (What to Expect) Alarm To Power Up the Distribution Amplifier Page Using Commands to Control Key Functions (Examples) Using Commands to Control Key Functions (Examples) Distributing One Input Signal (A or B) Distributing Two Input Signals (A and B) Distributing Input A and Backup Oscillator (Option 010) Signals Distributing of the Backup Oscillator (Option 010) Signal Only Checking the Output Channels Status Changing the RS-232Serial Port Characteristics To Set Baud Rate, Pacing, Parity, and Data Bits Performance Tests Operational Verification Performance Tests Calibration (Option 010 Only) Test Record Page Test Equipment Required Test Equipment Required Table 2-1.Recommended Test Equipment CAUTION 58502A Operational Verification 58502A Operational Verification Outputs (1-12)Verification Figure 2-1.Operational Verification Setup Input A OUTPUT STATUS (1-12) Alarm and Status Output Verification Figure 2-2.Alarm/Status Output Verification Setup Figure 2-3.Output 12 Grounded Figure 2-4.ALARM/STATUS Port RS-232Verification (Optional) RS232 Figure 2-5. RS-232Verification Setup Page 58502A Performance Tests 58502A Performance Tests Input Level Response Tests Test 1: +7 dBm Input Level Test 2: +15 dBm Input Level 58502A Performance Test Record (Page 1 of 2) 58502A Performance Test Record (Page 1 of 2) Model 58502A Broadband Distribution Amplifier Line Number Operational Verification 58502A Performance Test Record (Page 2 of 2) 58502A Performance Tests (Continued) Input Level Response Tests (Continued) Test 2: +15 dBm Input Level 58502A Calibration (Option 010 Only) 58502A Calibration (Option 010 Only) Determining Frequency Difference Software Oscillator Adjustment Page Calibration Record (Page 1 of 1) Calibration Record (Page 1 of 1) Option 010 Broadband Distribution Amplifier Calibration Dates and Values Date EFC Value Frequency or Frequency Difference Features and Functions Page Inputs Inputs AC Input INPUTS A and B Ports Outputs 11 12 OUTPUTS (1-12)Ports ALARM/STATUS Port Outputs ALARM/STATUS Port Inputs Indicators Indicators Power Indicator Alarm Indicator Input A and B Indicators OUTPUT STATUS 1-12Indicators Serial Interface Ports RS-232Port RS-232Port Configuration Table 3-2. RS-232Port Interface Factory Default Values and Commands Making Changes to the Serial Port Settings (If Needed) Determining the Serial Port Settings Connecting a Terminal or Computer Connecting a Terminal or Computer To Connect a Terminal or Computer to the 58502A Figure 3-3.Connecting a PC or Terminal to the 58502A Different Ways to Check Alarm Status Different Ways to Check Alarm Status Configuring the Inputs To Configure One Input Operation To Configure Two-InputOperation Configuring the Inputs To Configure the Internal Oscillator as a Backup (Option 010) To Configure the Internal Oscillator as the Only Source Input (Option 010) Command Reference Page SCPI Conformance Information SCPI Conformance Information Command Syntax Conventions IEEE 488.2 Common Commands 58502A Command Summary Table 4-1.58502A Command Summary Summary Keyword/Syntax Parameters Table 4-1.58502A Command Summary (Continued) INPut (Continued) OUTPut:QUEStionable [SOURce]:ROSCillator ROSCillator Subsystem (USED WITH OPTION 010 ONLY) System Status Reporting Commands *CLS ALARm OUTPut:QUEStionable:PACKed OUTPut:QUEStionable[:UNPacked] SYSTem:ERRor Identification Command Identification Command *IDN Internal Oscillator Calibrating and Status Commands (Option Only) Internal Oscillator Calibrating and Status Commands (Option 010 Only) DIAGnostic:CALibration:ROSCillator:EFC:ABSolute UP | DOWN DIAGnostic:CALibration:ROSCillator:EFC:ABSolute DIAGnostic:CALibration:ROSCillator:EFC:ABSolute:STEP <numeric_value DIAGnostic:CALibration:ROSCillator:EFC:ABSolute:STEP [SOURce]:ROSCillator:WARM Input Port Status and Setup Commands Input Port Status and Setup Commands INPut:A:QUEStionable INPut:B:QUEStionable INPut:ALARM INPut:SELect A | B INPut:SELect INPut:SELect:AUTO 0 | INPut:SELect:AUTO INPut:SELect:DEFault A | B INPut:SELect:DEFault Serial Interface Communication Commands SYSTem:COMMunicate:SERial:BAUD <numeric_value SYSTem:COMMunicate:SERial:BAUD SYSTem:COMMunicate:SERial:BITS SYSTem:COMMunicate:SERial:FDUPlex SYSTem:COMMunicate:SERial:PACE XON | NONE SYSTem:COMMunicate:SERial:PACE SYSTem:COMMunicate:SERial:PARity EVEN | ODD | NONE SYSTem:COMMunicate:SERial:PARity Functional Description Page Functional Block Description of the 58502A Functional Block Description of the 58502A Figure 5-1.Simplified Block Diagram Controller Block Panel LEDs Block 2-to-1Switch Block 1-to-12Amplifiers and Isolators Block Power Supply Module Block Page Service Determining 58502A Fault Status Specifications Page Electrical Specifications Supplemental Characteristics Environmental Specifications Available Options Page SYMBOLS NUMERICS