HP 8559A Operation And Service Manual page 50

PERFORMANCE TESTS
4-15. RESOLUTION BANDWIDTH ACCURACY
SPECIFICATION:
Individual resolution bandwidth 3-dB points are calibrated to
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:
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.
FIGURE
EQUIPMENT:
Signal Generator
Extender Cable Assembly
Adapter, Type N (m) to BNC
Adapter, Type SMB
PERFORMANCE TESTS
0.707 (voltage ratio) X div/7.1 div
=
X div
=
5 div
SIGNAL GENERATOR
ADAPTER
RESOLUTION BANDWIDTH ACCURACY TEST SETUP, 3 MHz TO 100 kHz
(2 required)
(f)
(f) to BNC (f)
15% 30% for 3 MHz bandwidth).
SPECTRUM
ANALYZER
ADAPTER
MODEL 8559A
H P 8640B
H P 5060-0303
H P 1250-0780
H P 1250-1236