Service manual

Chapter 1 19
Overview
System Overview
2. Chapter Title 3. Chapter Title
4. Chapter Title
5. Chapter Title
1. Overview
Measuring Instrument System
The measuring instrument system of the Agilent E5023A has three major parts.
• Signal Generating Part
• Agilent E5037C/D Data Generator Module
• Agilent E5039B/C Bit Error Rate Test Module
• Signal Distribution Part
• Agilent E5043A/C Head Amplifier Control Unit
• Agilent E5029K Onstage Buffer Unit
• Agilent E5036A Filter Matrix Module
• Measuring Part
• Agilent E5038B Parametric Measurement Module
• Agilent E5039B/C Bit Error Test Module (Optional)
• Agilent E5040A Spectrum Measurement Module
• Agilent E5041A Dual Counter Module (Optional)
• Agilent 54845A/B Infinium Oscilloscope (E5023A Option 103)
• Agilent E4402B Spectrum Analayzer (E5023A Option 300)
Measurement Signal Flow
The signal produced by Agilent E5037C/D Data Generator Module is inputted to the head
amplifier, with a specified amount of write current, data is written to the media.
When reading the data, as specified by the amount of read current, the read data is
amplified by the head amplifier and inputted into the Filter Matrix Module.
The Agilent E5036A Filter Matrix Module then filters out the signal before sending it to
each measuring instrument.The Filter Matrix Module is equipped with four filters. The
user can set any of the four filters as desired.
The signal received by Agilent E5038B Parametric Measurement Module, Agilent
54845A/B Oscilloscope and Agilent E5041A Dual Counter Module will be filtered out
from this module. The filtered signal received by the parametric module is calculated by
this module whose results are displayed by the PC. However, for the Spectrum
Measurement (Agilent E5040A or 4395A or E5040A+E4402B ) and Agilent E5039B/C
Bit Error Test Module, the signals received are non-filtered. The signal is simply
pre-amplified as it passes through the filter matrix module.
Under normal measurement operation the data generator is used to produce the signal
needed for measurement. The Agilent E5039B/C Bit Error Rate Test Module on the other
hand, writes and reads its own signal. In other words, it produces its own signal and writes
its own data. The written data passes through the filter matrix module to be filtered out
before sending it to the bit error test module. A read channel IC in the bit error test module
reads the written data and checks what fraction of the total bits of the written data are in
error. Refer to the system block diagram as shown in Figure 1-3.