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Noise Sidebands
Table 11. Frequency Readout Accuracy ­ 4 GHz

Calibration Procedure For Spectrum Analyzer An/Usm-489A Page Navigation
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TB 9-6625-2250-24
(c) STEP .
(d) CONTROL TRIG.
MKR amplitude
(5) Press TI [SINGLE] key and wait for completion of sweep. TI
indication will be less than -76 dBc.
b. Adjustments. No adjustments can be made.
15. Frequency Readout and Frequency Count Marker Accuracy
a. Performance Check
(1) Connect TI 10 MHz REF IN/OUT to synthesized signal generator 10 MHz REF IN.
(2) Connect synthesized signal generator RF Output to TI INPUT 50 .
(3) Set synthesized signal generator frequency to 1.5 GHz and level output to -10 dBm.
(4) Press TI keys and enter values using DATA keys as listed in (a) through (f) below:
INSTRUMENT STATE PRESET.
(a)
FREQUENCY then [CENTER FREQ] to 1.5 GHz.
(b)
SPAN then [SPAN WIDTH] to 1 MHz.
(c)
INSTRUMENT STATE RECALL.
(d)
[MORE].
(e)
[FACTORY PRSEL PK].
(f)
(5) Press TI MARKER PEAK SEARCH key. TI MKR frequency indication will be
within limits specified in first row of table 10.
(6) Repeat technique of (4) (c) and (5) above for remaining TI SPAN [SPAN
WIDTH] settings listed in table 10. TI MKR frequency indications will be within the
limits specified in table 10.
Table 10. Frequency Readout Accuracy ­ 1.5 GHz
Synthesized
Test instrument
signal generator
FREQUENCY
SPAN
MKR frequency indications (GHz)
frequency
[SPAN WIDTH]
(CENTER FREQ]
setting
(GHz)
setting (GHz)
settings
Min
Max
1.5
1.5
1 MHz
1.499948
1.500051
1.5
1.5
10 MHz
1.49948
1.50051
1.5
1.5
20 MHz
1.49895
1.50104
1.5
1.5
50 MHz
1.49745
1.50254
1.5
1.5
100 MHz
1.4948
1.5052
1.5
1.5
1 GHz
1.450
1.550
(7) Set synthesized signal generator frequency to 4 GHz.
(8) Press TI keys and enter values using DATA keys as listed in (a) through (e) below:
(a) FREQUENCY then [CENTER FREQ] to 4 GHz.
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