Calibration— Type 1L30
|~1 13. Check Video Filter Operation
Page 6-19
With a sweep time of 5 ms/cm or faster and the RE
SOLUTION control one step back from the fully
clockwise position, the VIDEO FILTER should distort
a 200 M Hz IF feedthrough signal.
□ 14. Check Frequency Response of Video Circuit Page 6-20
Frequency range < 16 Hz to > 50 kHz.
Q 15. Check Incidental Frequency Modulation
Page 6-22
Incidental FM for a 200 M Hz IF feedthrough signal
should not exceed 200 Hz.
Incidental FM for a
tunable or converted signal (IF -f- Local Oscillator)
in phase lock condition should not exceed 300 Hz.
n 16. Adjust RF Mixer
Page 6-24
Apply a 100 M Hz signal to the RF INPUT connector.
Adjust MIXER PEAKING for optimum signal am pli
tude, then adjust C68 for optimum response and flat
ness across the dispersion window.
[~| 17. Adjust W id e Band Amplifier Response
Page 6-24
and Check System Response Flatness
Apply a 65 M Hz signal (— 60 dBm) to J120. Adjust
L I47 for minimum response to the signal.
Recon
nect the coaxial cable from J109 to J120. Apply an
amplitude calibrated signal that is approximately
— 50 dBm, within the frequency range of the analyzer
to the RF INPUT. Check the response flatness over the
100 M Hz dispersion window. Response flatness must
remain within ± 1 . 5 dB over the dispersion window.
Q 18. Check RF Center Frequency Calibration,
Page 6-27
System Sensitivity and Phase Lock Operation
Apply signal frequencies that are listed in Table 6-6
to the RF INPUT. Check the dial accuracy and the
analyzer sensitivtiy over, th e . frequency range. Ac
curacy must remain within . ( ± 2 M Hz + 1 % of the
dial reading). Check sensitivity with the RESOLU
T IO N control fully clockwise.
Scale 1
— 105 dBm
Scale 2
— 100 dBm
Scale 3
— 95 dBm
Scale 4
- 9 0 dBm
Scale 5
— 75 dBm
Check phase lock operation through the frequency
range of each band.
□ 19. Check Amplitude of Spurious Signals
Page 6-29
and Adjust Mixer Balance
Connect a 50 C2 termination to the RF INPUT con
nector. Check through the frequency range of each
band for spurious signals from internal sources. Must
not exceed 2 X noise amplitude.
Preliminary Procedure
Determine the output amplitude of the sawtooth from the
associated oscilloscope from Table 2-1 or the instruction
manual for the oscilloscope, then position the slide switch
SW201 (on the rear panel) to the appropriate position. Con
nect the Type 1L30 Spectrum Analyzer through a flexible
extension (Part No. 012-0038-00) to the J ll connector of the
oscilloscope plug-in compartment.
Connect a patch cord
from the oscilloscope Sawtooth O ut connector to the Anr
alyzer SWEEP INPUT connector.
Connect the oscilloscope to a suitable power source, turn
the power on, and allow 20 minutes warm-up time at an
ambient temperature of (25° C ± 5 ° C) before making ad
justments or checking the instrument to given accuracies.
Adjust the oscilloscope controls for a free running, 10 ms/cm
sweep.
NOTES
Содержание 1L30
Страница 48: ...si L i y n Maintenance Type 1L30 Fig 4 15 Honeycomb assembly drcui a n d component layout 4 n ...
Страница 59: ...Fig 6 1 A Test equipment required for calibration ...
Страница 60: ... Calibration Type 1130 ...
Страница 120: ...T Y P E I L 3 0 S P E C T R U M A N A L Y Z E R ib i IF SYSTEM BLOCK DIAGRAM 9 1 9 2 ...
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