HP 8559A and, 8640B, 4-24.SWEEP TIME ACCURACY(Cont'd)

PERFORMANCETESTS 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 10mseclDlV

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.