HP 8559A - 4-15. Resolution Bandwidth Accuracy

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