Confirming Span Problems - Agilent Technologies 8564EC Service Manual

2. Determine the harmonic-mixing number from the information in
Table 11-13 Harmonic Mixing Number versus Center Frequency
Center Frequency
9 kHz to 2.9 GHz
2.75 GHz to 6.46 GHz
5.86 GHz to 13.2 GHz
12.4 GHz to 31.15 GHz
30.5 GHz to 50.6 GHz
18 GHz to 325 GHz
3. Use the following equation to determine the 1st LO span used.
4. Refer to
Confirming Span Problems
1. First perform either the manual
2. If only 1st LO spans of 2 MHz or less are faulty, suspect the A14
3. If there are several spans in the main coil and FM coil ranges
Chapter 11
Table 11-13 on page
First LO Span
Table 11-12 on page 568
with the span.
or the automated "2. LO Frequency"
adjustments in Chapter 2 .
• On the spectrum analyzer press
all spans.
• If the YTO adjustment has sufficient range and only LO spans of
2.01 MHz or greater are faulty; test YTO linearity by performing
step c.
• Test the span in question at different center frequencies in the
same band. If the span accuracy changes significantly (2% or
more), suspect the A11 YTO.
fractional N PLL.
affected, suspect the A14 span attenuator.
Frequency Span Accuracy Problems
569.
Harmonic Mixing Number
1
1
2
4
8
6 through 54 depending upon lock
harmonic selected
Display Span Setting
= ------------------------------------------------------------------------------------------------- -
Current Band Harmonic Mixing Number
to determine the circuit associated
"7. YTO Adjustment"
and
,
CAL REALIGN LO &IF
Synthesizer Section
in Chapter 3 ,
"3. YTO FM Coil"
, and retest
569