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PERFORMANCE TESTS
MODEL
8559A
PERFORMANCE
TESTS
4-1
5.
RESOLUTION BANDWIDTH ACCURACY (Cont'd)
Signal Generator:
..............................................
COUNTERMODE INT,EXPANDXlO
AM
........................................................................
OFF
FM
........................................................................
OFF
....................................................
FREQUENCYTUNE 21.4MHz
..........................................................................
RF ON
......................................................
OUTPUTLEVEL
-
-3dBm
Connect equipment as shown in Figure 4
-
10.
NOTE
For early instruments that do not feature
A16J3, a 21.4
-
MHz signal can be
injected directly into the 300
-
MHz output (A1OJ1) of Third Converter Assem
-
bly A10. Set the signal generator OUTPUT LEVEL to 0 dBm and use the
spectrum analyzer REFERENCE LEVEL and REF LEVEL
FINE controls in
step 14
(=
-
40 dBm) to position the trace at 7.1 divisions above the graticule
baseline.
Adjust signal generator frequency until spectrum analyzer trace is at peak. Set signal generator OUTPUT
LEVEL to position trace at 7.1 divisions above graticule baseline. Set COUNTER MODE to EXPAND
XlOO (most significant digit will overflow).
Tune signal generator frequency until trace drops to 5 divisions above graticule baseline. Record signal
generator frequency.
MHz
Tune signal generator frequency in direction opposite to that of step 15 until trace peaks (7.1 divisions
above graticule baseline) and then drops to 5 divisions above graticule baseline. Record signal generator
frequency.
MHz
Calculate and record resolution bandwidth at 3
-
dB points (difference between frequencies recorded in
steps 15 and 16).
Min. Actual Max.
25.0 kHz 34.50 kHz
Set RESOLUTION BW to 10 kHz, leaving FREQ
SPAWDIV set to
0.
Repeat steps 14 through 17.
Min. Actual Max.
8.0 kHz 11
SO
kHz