Test 2. Frequency Span Accuracy Test - HP 8568B Performance Tests And Adjustments Manual

Span Accuracy Test
r
Spectrum Analyzer
Center
1
Span Frequency Cf-.45 span
200
Hz
100 MHz 99.999 910 MHz 100.000 090 MHz
100 MHz 99.955 000 MHz 100.045 000 MHz
100.1 kHz
100 MHz 99.954955 MHz 100.045045 MHz
100 MHz 99.550 OOOMHz 100.450 000 MHz 900.000kHz
1.01 MHz 100 MHz 99.550 550 MHz 100.450 500 MHz 909.000kHz
20
MHz
100 MHz 91.000000 MHz 109.000000 MHz
20.1
MHz 100 MHz 90.955 000 MHz 109.045.000 MHz
1.5 GHz
900 MHz
Note
Steps 7, 9, and 11. Wide Span Error
Synthesized Sweeper
Freq. A Freq. B
cf + .45 span
225 1575
MHz MHz
Freq Span Span Error
1
ADUT- ASyn
from 'able 2-3
200 Hz
100 kHz
100.1 kHz
1 MHz
1.01 MHz
20 MHz
20.1 MHz
1.5 GHz
The specification in Table 2-4 was derived using the following formula:
For spans > 1 MHz, the spec is: >&[(.02)(A synth freq) + (.005)(span)]
For spans 5 1 MHz, the spec is: >&[(.05)(A synth freq) + (.005)(span)]
DUT Measured
A Synth Freq. C
180 Hz
90.000 Hz
18.000 MHz
Step 12. Span Error
Min
- 1 0 Hz
-5000
-5,005
-50,000
-23,230
-460,000
-462,300
Freq. D A DUT
Max
10 Hz
Hz 5000 Hz
Hz 5,005 Hz
Hz 50,000 Hz
Hz 23,230 Hz
460,000
Hz Hz
Hz 462,300 Hz
Hz 34,500O.OOO Hz
Performance Tests 2-71