HP 8559A Operation And Service Manual page 42

PERFORMANCE TESTS
FREQUENCY SPAN ACCURACY (Cont'd)
13. Set function generator frequency to 200 kHz
tor output to comb generator MODULATION input. Set function generator OUTPUT LEVEL for a
clean 200-kHz comb on the spectrum analyzer display.
To obtain a clean comb on the spectrum analyzer display, use either the
LOW or HIGH output of the function generator and readjust the OUTPUT
LEVEL control as necessary.
1 4 . Set spectrum analyzer FREQ SPAN/DIV to 200 kHz. Adjust TUNING control to position one spectral
line on the first graticule line. Measure the error between ninth spectral line and ninth graticule line. Error
should be no greater than
15. Using the procedure of NOTE in step 13, vary spectrum analyzer FREQ SPAWDIV and function genera-
tor output frequency in accordance with Table 4-2. Adjust spectrum analyzer TUNING control to position
one spectral line on the first graticule line. Measure the span error between ninth spectral line and ninth
graticule line.
Disconnect function generator from comb generator when setting fre-
quency with frequency counter. Increase spectrum analyzer REFERENCE
LEVEL control setting as necessary for the lowest frequencies.
I
Spectrum Analyzer
kHz
100
kHz
50
kHz
20
kHz
*Check function generator output frequency using a frequency counter. Frequency readout should be within
desired audio frequency.
PERFORMANCE TESTS
0.5%) using frequency counter. Connect function genera-
NOTE
0.4 division.
NOTE
TABLE 4-2. NARROW SPAN WIDTH ERROR MEASUREMENT
Function Generator
Output Frequency*
BW
RESOLUTION
OPTIMUM
OPTIMUM
OPTIMUM
OPTIMUM
Span Width Error
100 kHz k0.4 div.
50 kHz
kHz
20
kHz
k0.4 div.
MODEL 8559A
div
div.
div.
div.
div.
0.5% of