Symmetricom 58502A - Manual (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
± 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.
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
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 (2
20 -1)
Mid-Range: 524,288
Default Step Size: 10,000
Minimum Step Size: 1
Maximum Step Size (LIMIT ON): 35,000