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PERFORMANCE TESTS MODEL 8559A
PERFORMANCE
TESTS
4-1
1.
FREQUENCY SPAN ACCURACY (Cont'd)
13.
Set function generator frequency to 200 kHz
(k
0.5%)
using frequency counter. Connect function genera
-
tor output to comb generator MODULATION input. Set function generator OUTPUT LEVEL for a
clean 200
-
kHz comb on the spectrum analyzer display.
NOTE
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.
14.
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
k
0.4
division.
div
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.
NOTE
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.
TABLE
4-2.
NARROW SPAN WIDTH ERROR MEASUREMENT
I
*Check function generator output frequency using a frequency counter. Frequency readout should be within
f
0.5%
of
desired audio frequency.
Function Generator
Span
Width
Error
Output Frequency*
I
Spectrum Analyzer
100
kHz
50
kHz
20
kHz
10
kHz
FREQ SPANIDIV
RESOLUTION
BW
OPTIMUM
OPTIMUM
OPTIMUM
OPTIMUM
100
kHz
50
kHz
20
kHz
10
kHz
k0.4
div.
-
div.
+0.4
div.
-
div.
k0.4
div.
-
div.
k0.4
div.
-
div.