c.
Press FULL
IE
ADJ
. Observe the DVM reading between the displayed messages

IF ADJUSTSTATUS: 300

kHz

RBW

and

IF ADJUST STATUS: 3

kHz

RBW.

Duringthistime
period, the voltage should be within a 2 to 10 Vdc range.
d. Observe the DVM reading while

IF ADJUST STATUS: AMPLITUDE

is displayed. The
reading should be within the 2 to 10 Vdc range.
e. If the DVM reading is outside the range in step c but inside the range in step d, suspect
a reactive component of the filter.
8. If the ALC loop is working correctly (A4J9 pin 4 within the test tolerances given), then
either the output attenuator is defective, or A4U810 pin 6 (in ALC loop integrator) is
outside of its
+3
to
+6
Vdc range.
9. Reconnect W52 (coax 9) to A5J4.
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 HP 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
HP
8566A/B
spectrum analyzer.
7. Connect the probe power cable to the HP 85623 spectrum analyzer front-panel PROBE
POWER connector (you may need to use a probe power extension cable, HP 10131B).
8. Press (INSTR PRESET) on the HP
8566A/B
and set the controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.8 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 Hz
Reference level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -43
dBm
Resolution bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 kHz
Videobandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10kHz
Sweep time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50ms
Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 dB/division
Sweep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single
9. On the HP 8562E spectrum analyzer, press
(jj]
and (CAL).
10.
Press

FULL IF ADJ

. When the display reads

ADJUSTING IF: 10

kHz

RBW,

press
cm)
on
the HP
8566A/B.
11. The HP
8566A/B
screen illustrates frequency versus time of the cal oscillator output
sweeps. See Figure 9-16. The slope of the HP
8566A/B
100 kHz 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

. When the display reads

ADJUSTING IF: 3

kHz,

press
(ml
on the
HP
8566A/B.
9-34 IF Section