Khz And 10 Khz Resolution Bandwidth Problems - Agilent Technologies 8564EC Service Manual

3 kHz and 10 kHz Resolution Bandwidth Problems

Asymmetric Filter Response: Check the crystal symmetry control with
the following steps:
1. Press
2. Set the 8564EC or 8565EC spectrum analyzer controls as
3. On the 8564EC or 8565EC spectrum analyzer, connect the
4. A trace similar to
Narrow 10 kHz resolution bandwidth: Check for printed-circuit board
contamination. Clean the board as required.
IF Gain Compression in 10 kHz resolution bandwidth: FET transistors
Q202, Q203, Q501, and Q503 can deteriorate with age. Measuring less
than 0 volts on the FET source indicates a bad FET.
Figure 9-20 Faulty Crystal Symmetry
Chapter 9
.
PRESET
follows:
Resolution bandwidth .................................................. 3 kHz
Span .......................................................................... 100 kHz
Center frequency ..................................................... 300 MHz
300 MHz CAL OUTPUT to the INPUT 50Ω .
Figure 9-20, "Faulty Crystal Symmetry"
a failed crystal-symmetry circuit.
IF Section
A5 IF Assembly
indicates
467