Sweep Width Settings - HP 8562E Service Manual

Sweep Width Sweep Time Res BW RANGE MA1
Automatic IF Adjustment
The spectrum analyzer performs an automatic adjustment of the IF Section whenever needed.
The cal oscillator on the A4 assembly provides a stimulus signal which is routed through the
IF during the retrace period.
The A3 Interface assembly measures the response using its analog-to-digital converter (ADC).
The spectrum analyzer turns the cal oscillator off during a sweep.
When IF ADJ is ON, the spectrum analyzer readjusts part of the IF circuitry during each
retrace period to readjust the IF completely every 5 minutes.
Automatic IF adjustment is performed upon the following conditions:
Power on:
n (unless
values loaded in program ROM and all possible IF adjustments are made. If
pressed, the adjustment is halted.
n If REAXGI? LO
made with the most recent IF parameter variables used as the starting point.
If FULL IF AD3
parameter variables used as the starting point.
. If ADJ IF STATE
are adjusted. The bandwidths adjusted are a function of the currently selected resolution
bandwidth setting.
sweeps:
IF ADJ must be set to ON. When IF ADJ is OFF, an
the left side of the graticule.
If a FULL IF ADJ sequence cannot proceed beyond the amplitude portion, check the output
of the cal oscillator on the A4 assembly as follows:
1. Disconnect cable W52 ( coax 9) from A5J4. Connect cable W52 to the input of a second
spectrum analyzer.
2. Set the second spectrum analyzer center frequency to
- 3 0 dBm.
3. On the spectrum analyzer under test, press
second spectrum analyzer
Table 9-3. Sweep Width Settings
20 kHz
5 ms
10 kHz
10 ms
4 kHz 30 ms
2 kHz 15 ms
STOP ALIGN is pressed). The IF parameter variables are initialized to
is selected: All possible IF adjustments are made with the most recent IF
is selected: All amplitude data and some resolution bandwidths
FULL IF ADJ and observe the display of the
Adjusted A4U105 A4U105 A4U105
Pin2
10 kHz
3 kHz
1 kHz
300 Hz +5 V
(FULL IF ADJ
10.7 MHz
MAO
Pill5
ov ov
ov
ov
STOP ALIGN
is located in the (CAL) menu.)
A is displayed along
and the reference level
IF Section 9-9
is
to