Performance Verification
4-14 2715 Spectrum Analyzer Service Manual
9. Using Table4 --7, check the rest of the filters with and without the preamp
enabled. If necessary, use an external attenuator to reach a --139 dBm setting.
Check with Preamp OFF as specifi ed in Table4 --8.
1. Recall default power up settings by pressing UTIL 1 1.
2. Select the following settings on the Spectrum Analyzer:
FREQUENCY 1800 MHz
REFERENCE LEVEL --30 dB m
SPAN/DIV ZERO SPAN
RESOLUTION BW 5 MHz
VERTICAL SCALE 10 dB/
3. Set the VIDEO FILTERto 10 Hz by pressing UTIL251.
4. Make sure that the preamplifieris disabled (INPUT 1).
5. Check that the noise floor is ≤-- 77 dBm.
6. Check sensitivity as specified in Table4--8 forthe remaining bandpass
filters.
Table4 -8: Sensitivity Settings at 1800 MHz
Res BW Ref Level Sensitivity
5MHz --30 dBm --77dBm
1MHz --30 dBm --84dBm
300 kHz --30dBm --89 dBm
100 kHz --40dBm --94 dBm
30 kHz --50dBm --99 dBm
10 kHz --50dBm --104 dBm
3 kHz --60dBm --109 dBm
1 kHz --60dBm -- 1 1 4 d B m
300 Hz --70dBm -- 11 9 dBm
Sensitivity at 1.8 GHz