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PERFORMANCE TESTS MODEL 8559A
PERFORMANCE
TESTS
4
-
24.
SWEEP
TIME
ACCURACY (Cont'd)
2. Connect equipment as shown in Figure
4
-
19.
Connect counter's
B
10 MHz input to the function generator
low output and the signal generator's
AM
input.
3.
Adjust spectrum analyzer TUNING control to center 100-MHz signal on CRT Set FREQ SPAWDIV
control to 0, leaving RESOLUTION BW control at
3
MHz setting. Set SWEEP TIME/DIV control to
2
psec.
4.
Set
AM
switch of HP
8640B
to AC position. Adjust function generator AMPLITUDE control and signal
generator AM MODULATION control for 50 percent modulation
as
indicated on the signal generator
meter.
5. Set spectrum analyzer SWEEP TRIGGER control to VIDEO. Adjust REFERENCE LEVEL
and
REF
LEVEL FINE controls to center waveform on CRT
6.
Adjust function generator Frequency vernier to display exactly five cycles of triangle wave modulation on
CRT,
as
shown in Figure 4
-
20a. Counter should indicate an average period of 4.00
+
0.04 ps.
5
cycles
10
cycles
a.
2pseclDIV
b.
5pseclDIV
through 10
mseclDlV
FIGURE
4-20,
SWEEP TIME ACCURACY
7.
Calculate actual sweep time per division by dividing average period from step
6
by 2. Record value in Table
4
-
14.
8.
For spectrum analyzer SWEEP TIME/DIV control settings of 5 psec through 10 msec, adjust function
generator RANGE and frequency controls to display exactly 10 cycles of triangle wave modulation on
CRT,
as
shown in Figure 4
-
20b. Average period readings displayed on counter correspond to actual sweep
time per division. Record values in Table 4
-
14.