HP 8444A - Page 22

Operation
3-13. Crystal Filter Measurement
3-14. Figure 3-5 illustrates the CRT display for a
20 MHz crystal filter. Filter characteristics: 2-kHz
passband with bandwidth at the 60-dB points less
than 10 kHz,
a. Spectrum Analyzer (8555A) control
settings:
FREQUENCY cas auakd lee da 20 MHz
BANDWIDTH cy Gen ae vet maaan 8 kHz
SCAN WIDTH PER DIVISION ......... 5 kHz
INPUT ATTENUATION ........ sxspaa LOGB
SCAN TIME PER DIVISION 20 MILLISECONDS
LOG REF EN yd vin ty ernannt 0 dBm
VIDEO FILTER socios l... 100 Ha
SCAN MODE 6.5 e908 x4 nae bla, eaten We INT
SCAN TRIGGER nen are wee AUTO
LOG/LINEAR ...... hh tn tot od te Aas a ee vets LOG
b. Tracking Generator control settings:
TRACK ADJ mamasa es re Peak
LEVEL..... A eee re ee Harana 0 dBm
Figure 3-5. 20 MHz Crystal Filter CRT Display
3-15. Bandpass Filter Measurement
3-16. Figure 3-6 illustrates the CRT display for a
50 MHz bandpass filter. Filter characteristics: 50
MHz, 4-pole bandpass filter; adjusted for band-
width of approximately 5 MHz at the 3 dB points.
Bandwidth at 60 dB points is approximately 32
MHz.
a. Spectrum Analyzer (8555A) control set-
tings:
FREQUENCY ........... par DO MHZ
BANDWIDTH seccional eee kane he 10 kHz
SCAN WIDTH PER DIVISION ......... 5 MHz
INPUT ATTENUATION 7o cu peas swat LOGB
3-8
Model 84444
SCAN TIME PER DIVISION ..... 0.5 SECONDS
LOG REF LEVEL soc rn 0 dBm
VIDEO FILTER aac re ner 10 Hz
SCAN MODE nee a INP
SCAN TRIGGER: eu aa sera AUTO
LOG LEINDAR ss dia LOG
b. Tracking Generator control settings:
TRACK ADJ ¿oia darse tos Peak
EEVER pesar anida 0 dBm
Figure 3-6. 50 MHz Bandpass Filter CRT Display
3-17. Low-Pass Filter Measurement
3-18. Figure 3-7 illustrates the CRT display for a
23 MHz low-pass filter, Filter characteristics: 3 dB
point at approximately 23 MHz, 60 dB point at
approximately 42 MHz.
a. Spectrum Analyzer (8555A) control
settings:
FREQUENCY enla 25 MHz
SCAN WIDTH PER DIVISION ......... 5 MHz
BANDWIDTH ......... Er 100 kHz
INPUT ATTENUATION econ 10 dB
SCAN TIME PER DIVISION ..... 0.1 SECONDS
LOG/LINEAR ran LOG
LOG REF LEVEL ............... (+) 10 dBm
LOG REF LEVEL Vernier ............ —3 dB
VIDBOBILFER aa tias 10 Hz
SCAN MODE 2. 2a: #2 da dos oft UNT
SCAN-TRIGOE Roura 2 ei AUTO
b. Tracking Generator control settings: