TB 9-6625-2327-35
11. Spectral Purity
a. Performance Check
(1) Connect TI 10 MHz In to spectrum analyzer 10 MHz REF OUT.
(2) Connect TI Output to spectrum analyzer INPUT 50 Ω.
(3) Press TI keys as listed in (a) through (e) below:
(a)
Output on.
(b)
Sine.
(c)
Utility, Output Setup, Load and Done.
(d)
Ampl, 1, and V p-p.
(e)
Freq, 500, kHz.
(4) Adjust spectrum analyzer controls to display 500 kHz fundamental. All
harmonics will be less than the maximum indication listed in table 9.
NOTE
Lower test instrument frequencies require a lower video and
resolution bandwidth. (Exp. RBW 300 Hz VBW 30 Hz.)
Test instrument
Spectrum analyzer
Amplitude
Maximum
V p-p
Center frequency
indication
500 kHz
1
500 kHz
-60 dBc
900 kHz
1
900 kHz
-60 dBc
2 MHz
1
2
MHz
-57 dBc
4 MHz
1
4
MHz
-57 dBc
6 MHz
1
6
MHz
-37 dBc
75 MHz
1
75
MHz
-37 dBc
500 kHz
10
500 kHz
-55 dBc
900 kHz
10
900 kHz
-55 dBc
2 MHz
10
2
MHz
-45 dBc
4 MHz
10
4
MHz
-45 dBc
6 MHz
10
6
MHz
-30 dBc
75 MHz
10
75
MHz
-30 dBc
(5) Repeat technique of (3) and (4) above for the remaining settings listed in table 9.
(6) Press Output to off and disconnect TI from spectrum analyzer.
(7) Connect TI Output to audio analyzer INPUT HIGH using 50 Ω feedthrough
termination.
(8) Press TI keys as listed in (a) through (c) below:
CHANGE 1
