9.Impulse Bandwidth Adjustments

13.Using the DATA knob, adjust the marker down one side of the display signal to the 7.3 dB point; CRT MKR A annotation indicates 0.430 X.

A4A9

I F C O N T R O L

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1

Figure 4-8. Location of Bandwidth Adjustments

14.Adjust A4A9R61 1 MHz for MKR A indication of 500 kHz while maintaining the marker at 0.430 X using the DATA knob. Refer to Figure 4-8 for the adjustment location.

15.Press MARKER @. Adjust marker to the opposite side of the signal (CRT MKR A annotation indicate 1.00 X). There are now two markers; one on each of the signal at the 7.3 dB point.

16.The CRT MKR A annotation now indicates the impulse bandwidth of the 1 MHz bandwidth. The impulse bandwidth should be 1.00 MHz fO.10 MHz.

17.Key in (jjj 300 kHz, (FREQUENCY SPAN) 500 kHz,

CPEAK SEARCH), and CMKR]. If necessary, readjust by pressing [REFERENCE LEVEL]] and using the DATA knob to place the signal peak at the top of the graticule.

18.Press MARKER IOFF] then MARKER @.

19.Using the DATA knob, adjust the marker down one the displayed signal to the 7.3 dB point; CRT MKR A annotation indicates 0.430 X.

20.Adjust A4A9R62 300 kHz for MKR A indication of 150 kHz while maintaining marker at 0.430 X using the data knob. Refer to Figure 4-8 for location of adjustment.

21.Press MARKER Ia]. Adjust the marker to the 7.3 dB point on the opposite side of the signal (CRT MKR A annotation indicates 1.00 Xl*

22.The CRT MKR A annotation now indicates the impulse bandwidth of the 300 kHz bandwidth. The impulse bandwidth should be 300.00 h30.00 kHz.

23.Key in @EYEiT) 10 kHz, [FREQUENCY SPAN] 20 kHz, [PEAK SEARCH), and C-1. If necessary, readjust by pressing

4-28 Option 462