TM 11-6625-2781-14&P-2
Section IV
PERFORMANCE TESTS (cont'd)
4-28. Spurious Responses (cont'd)
DESCRIPTION:
To verify spurious response level the two-tone method of measuring intermodulation distortion will be used. The outputs
of two signal generators, tuned 50 kHz apart, are applied to the spectrum analyzer RF INPUT. The generator levels are
adjusted equally to -43 dBm (-40 dBm total power) at the analyzers input mixer. No IM products from 100 kHz to 110
MHz should be present above -110 dBm (-70 dB from -40 dBm).
Figure 4-12. Intermodulation Distortion Test
EQUIPMENT:
Signal Generator................................ ................................ ................................ ................................ ......... HP 606B
Signal Generator................................ ................................ ................................ ................................ ......... HP 608F
BNC Cable Assembly (2) ................................ ................................ ................................ ........................ HP 10503A
BNC Tee................................ ................................ ................................ ................................ ................. UG-274B/U
1. Connect the test setup shown in Figure 4-12 and make the following control settings:
ANALYZER
RANGE MHz ................................ ................................ ................................ ................................ ................... 0-110
BANDWIDTH ................................ ................................ ................................ ................................ ................... 1 kHz
SCAN WIDTH PER DIVISION ................................ ................................ ................................ ....................... 20 kHz
FREQUENCY ................................ ................................ ................................ ................................ ............... 10 MHz
INPUT ATTENUATION................................ ................................ ................................ ................................ ...... 0 dB
SCAN TIME PER DIVISION ................................ ................................ ................................ ........ 2 MILLISECONDS
LOG REF LEVEL ................................ ................................ ................................ ................................ ......... -40 dBm
TUNING STABILIZER................................ ................................ ................................ ................................ ...........On
VIDEO FILTER ................................ ................................ ................................ ................................ .................. OFF
SCAN MODE ................................ ................................ ................................ ................................ ....................... INT
SCAN TRIGGER ................................ ................................ ................................ ................................ ............ AUTO
SIGNAL GENERATORS
Signal Generator No 1 (606B) FREQUENCY ................................ ................................ ............ 9 950 MHz (approx )
Signal Generator No 2 (608F) FREQUENCY ................................ ................................ ................. 10 MHz (approx )
AMPLITUDE ................................ ................................ ................................ ................................ .. -40 dBm (approx)
4-17
