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PERFORMANCE TESTS
PERFORMANCE
TESTS
MODEL 8559A
4
-
15.
RESOLUTION BANDWIDTH ACCURACY
SPECIFICATION:
Individual resolution bandwidth 3
-
dB points are calibrated to
+
15%
(+
30% for 3 MHz bandwidth).
DESCRIPTION:
Resolution bandwidth accuracy is measured in the linear mode to eliminate log amplifier errors. Since signal
level at the 3
-
dB points (half-power points) is related to peak signal level by a voltage ratio of 0.707: 1 .O, a peak
level of 7.1 vertical divisions on the spectrum analyzer display gives a half-power level of 5 vertical divisions:
0.707 (voltage ratio)
=
X div/7.1 div
X
div
=
(7.1)(0.707)
-
5 div
In the 30-,
lo-, 3
-
, and l-kHz bandwidths, a 21.4 MHz signal (final IF) is injected directly into Bandwidth Filter
No. 1 Assembly
A1 1 to provide the stability required for measurement of narrow resolution bandwidths.
SPECTRUM
ANALYZER
SIGNAL GENERATOR
ADAPTER
P
P
ADAPTER
FIGURE
4-9.
RESOLUTION BANDWIDTH ACCURACY TEST SETUP,
3
MHz
TO
100
kHz
EQUIPMENT:
Signal Generator
.........................................................
HP 8640B
Extender Cable Assembly
..............................................
HP 5060
-
0303
Adapter, Type N (m) to BNC
(f)
(2 required)
...............................
HP 1250
-
0780
Adapter, Type SMB
(f)
to BNC
(f)
.......................................
HP 1250-1236