TB 9-6625-2327-24
(21) Set Output to off and disconnect equipment.
b. Adjustments. Perform entire alignment procedure listed in paragraph 13.
11. Spectral Purity
a. Performance Check
(1) Connect TI Output to spectrum analyzer INPUT 50Ω. Connect TI 10 MHz In
to spectrum analyzer 10 MHz REF OUT.
(2) Press TI keys as listed in (a) through (c) below:
(a) Output on.
(b) Sine.
(c) Utility, Output Setup, Load and Done.
(3) Adjust TI for output at fundamental frequency and amplitude listed in table 9.
(4) Adjust spectrum analyzer to display fundamental. Peak amplitude marker on
signal displayed. Use this amplitude measurement as reference.
(5) Adjust spectrum analyzer to display harmonics of signal.
If amplitude of
harmonics is not within limits specified in table 9, perform b below.
NOTE
Lower fundamental frequencies require a lower video and
resolution bandwidth setting. (Exp. RBW 300 Hz VBW 30 Hz).
(6) Repeat technique of (3) through (5) above for remaining parameters listed in
Table 9. Harmonic Distortion.
Test instrument
Spectrum analyzer
Fundamental
Amplitude
Center frequency
Limits
(V p-p)
(Hz)
<(dBc)
(Hz)
500
k
1
500
k
-60
900
k
1
900
k
-60
2M
1
2
M
-57
4M
1
4
M
-57
6M
1
6
M
-37
75
M
1
75
M
-37
500
k
10
500
k
-55
900
k
10
900
k
-55
2M
10
2
M
-45
4M
10
4
M
-45
6M
10
6
M
-30
75
M
10
75
M
-30
(7) Set Output to off and disconnect equipment.
(8) Connect TI Output to audio analyzer INPUT HIGH through a 50 Ω
feedthrough termination.
