Symmetricom 58502A User Manual download pdf (Page 42)

Chapter 2 Performance Tests

58502A Calibration (Option 010 Only)

2-16 User’s Guide

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.

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

−10

per day (

−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.

NOTE 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

−6

maximum with a minimum resolution of 4

−12

The software EFC control range is mapped onto a numerical range of

values as follows:

Minimum: 0

Maximum: 1,048,575 (2

-1)

Mid-Range: 524,288

Default Step Size: 10,000

Minimum Step Size: 1

Maximum Step Size (LIMIT ON): 35,000

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Symmetricom 58502A User Manual Page 42