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ADJUSTMENTS
/
--
5
-
22.
3
dB BANDWIDTH ADJUSTMENTS (SERIAL PREFIX 1909A)
REFERENCE:
A9 Schematic
DESCRIPTION:
The 3
-
dB bandwidths for the 3 MHz, 1 MHz and 300 kHz RESOLUTION BW settings are adjusted using the
CAL OUTPUT
as
the signal source. The 3
-
dB bandwidths for the 10 kHz, 3 kHz, and 1 kHz RESOLUTION
BW settings are adjusted by injecting a stable 321.4 MHz signal into the third converter of the spectrum
analyzer.
DISPLAY SIGNAL GENERATOR FREQUENCY COUNTER
EXTENDER
CABLE
-
),
11111,
,111,
13
SPECTRUM
ASSEMBLY
(2
I
3,
1)
(
3
ANALYZER
OUTPUT
FIGURE
5-8.
3dB BANDWIDTH ADJUSTMENTTESTSETUP
PROCEDURE:
1.
Set spectrum analyzer controls
as
follows:
..................................................
FREQUENCY BAND GHz .01-
3
.................................................................
TUNING 35 MHz
.........................................................
FREQ SPAN/DIV
200
kHz
.........................................................
RESOLUTION BW 1 MHz
INPUTAmEN
.............................................................
20dB
...............................................................
REF LEVEL dBm 0
..............................................................
Amplitude Scale LIN
.........................................................
SWEEP TIME/DIV 1 msec
SWEEPTRIGGER
.....................................................
FREERUN
VIDEOFILTER
.............................................................
MIN
2. Connect equipment
as
shown in Figure
5
-
8
except for signal input to AlOW 1. Connect CAL OUTPUT to
spectrum analyzer INPUT
5(X1.