300 Hz To 3 Khz Resolution Bandwidth Out Of Specification - Agilent Technologies 8564EC Service Manual

IF Section
Cal Oscillator (P/O A4 Assembly)
300 Hz to 3 kHz Resolution Bandwidth Out of
Specification
1. If the 3 dB bandwidth of one of these filters is incorrect, suspect a
failure of one of the five available sweeps from the cal oscillator
sweep generator (function block Z). These sweeps are generated by
changing the switch settings of A4U803 which routes signals
through A4U802 and A4U804.
2. Disconnect W52 (coax 9) from A4J8.
3. Connect an SMB tee to A4J8, using a short coaxial cable with SMB
connectors.
4. Connect one output of the tee to cable W52 (coax 9).
5. Connect an 85024A active probe to the other output of the tee.
6. Connect the output (type N connector) of the active probe to the
input of the 8566A/B spectrum analyzer.
7. Connect the probe power cable to the 8564EC or 8565EC
spectrum analyzer front panel PROBE POWER connector (you may
need to use a probe power extension cable, 10131B).
8. Press
INSTR PRESET
Center frequency ................................................. 10.8 MHz
Span .............................................................................. 0 Hz
Reference level ....................................................... −43 dBm
Resolution bandwidth ............................................ 100 kHz
Video bandwidth ....................................................... 10 kHz
Sweep time ................................................................. 50 ms
Scale ................................................................ 1 dB/division
Sweep ..................................................................... SINGLE
9. On the 8564EC or 8565EC spectrum analyzer, press
and .
CAL
10.Press
FULL IF ADJ
10 kHz RBW, press
11.The 8566A/B screen illustrates frequency versus time of the output
sweeps of the cal oscillator. See
kHz Resolution Bandwidth."
resolution bandwidth is used to detect frequency changes. Sweeps
that vary (greater than 30 percent) from the normal levels, trigger
error code ERR 581 or ERR 582.
12.Press
FULL IF ADJ
press on the 8566A/B.
SINGLE
472
on the 8566A/B and set the controls as follows:
. When the display reads ADJUSTING IF:
on the 8566A/B.
SINGLE
Figure 9-21, "Output Waveform, 10
The slope of the 8566A/B 100 kHz
. When the display reads ADJUSTING IF: 3 kHz,
PRESET
Chapter 9