Agilent Technologies 8360 L Series, Service Manual

Page: 189 / 603

12. Circle P ASS on the test record if all the results in T able 2-29 are P ASS.
If not, circle F AIL on the test record.
A C FM (at 100 kHz) (Using HP/Agilent 3325A)
Note
Maxim um FM deviation for a 100 kHz rate is limited to a mo dulation index of
5 times n, where n = frequency band. The mo dulation index is equiv alen t to
deviation/rate.
Syn thesizer mo dels without 1 GHz capabilit y should use 5 GHz settings, as
indicated in paren thesis, instead of 1 GHz.
13. On the syn thesizer, press:
4 CW 5 4 1 5 4 GHz 5 (5 GHz)
14. On the sp ectrum analyzer, set:
Center frequency: Same as synthesizer frequency
Frequency Span: 1 MHz
Reference Level: 10 dBm
Clear all data from the display.
15. Cen ter the signal on the analyzer display .
16. Connect the syn thesized function generator and set it as follows:
Function: Sine wave
Frequency (FM Rate): 100 kHz
Amplitude: 1 mV
17. On the syn thesizer, press:
4 MOD 5
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FM On/Off 100 kHz (asterisk on)
or, for syn thesizers with Option 002, press:
4
MOD
5
NNNNNNNNNNNNNNNNNNNNNNN
FM Menu
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
FM On/Off Ext (asterisk on)
This activ ates FM sensitivity . Use the do wn arrow k ey to set FM sensitivity to 1.00
MHz/V.
18. On the function generator, set:
Amplitude (Calculated Null Voltage): 271 mV rms
Use the 4 AMPTD CAL 5 k ey to do an amplitude calibration. Use the arrow k eys to adjust the
amplitude to ac hiev e a n ull of the 1st sideband (Sideband Nulled).
Note
The sidebands may not resp ond to increases and decreases of the FM input
v oltage symmetrically . In this case, take the a v erage of the v oltages that cause
the low er sideband and upp er sideband to n ull. If the sidebands n ull at more
than one v oltage lev el, use the low er v oltage v alue as the n ull v oltage.
19. Record the \Actual Null V oltage" in the space pro vided in T able 2-30.
20. Calculate the actual FM sensitivit y using the formula:
Actual FM Sensitivit y =
Calculated Null V oltage
Actual Null V oltage
(Set FM Sensitivit y)
Record this v alue in the space pro vided in T able 2-30.
2-102 P erformance T ests
Maximum FM Deviation
Agilent 8360