HP 8568B 13.Average Noise Level Tkst

13. Average Noise Level Test

13.Average Noise Level Tkst

Specification c-135 dBm for frequencies >I MHz, c-112 dBm for frequencies <l MHz but >500 Hz with 10 Hz resolution bandwidth, 0 dB input attenuation, 1 Hz video filter.

Option 001: c-129 dBm for frequencies >l MHz, c-106 dBm for frequencies 51 MHz but >500 Hz with 10 Hz resolution bandwidth, 0 dB input attenuation, 1 Hz video filter (SIGNAL INPUT 1 only).

Description The average noise level is checked by observing the displayed noise level at several frequencies with no input signal applied.

Equipment 50 Ohm Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .HP 11593A

Procedure 1. Press (~NsTR PRESET].

2.Connect CAL OUTPUT to SIGNAL INPUT 2.

3.Press m @. Adjust AMPTD CAL for a MARKER amplitude of -10.00 dBm 50.02 dB.

4.Press ~NSTR PRESET].

5.Disconnect CAL OUTPUT from analyzer. Terminate SIGNAL INPUT 2 with a 509 coaxial termination.

6.Key in spectrum analyzer settings as follows:

CATTEN) . . . .			. . . .		. .		. . . . . . . . . .	. . . . . . . . . . . .	. . . . . . . . . . . . . . 0 dB
									501 HZ
(		CENTER FREQUENCY] .					. . . . . . . . . .	. . . . . . . . . . .
		FREQUENCY			. . . . . . . .SPAN)			. . . . . . . . . . . . . . . . . . . . . . . . . .
		;W, . . . . . . .			. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Hz
									-80 dBm
		REFERENCE	LEVEL			. . . . . . . . . . .)		. . . . . . . . . . . . . . . . . . . . . .
					__			__	1Hz
	i-1 .		. . . .. ............ ..............................
									20. seconds
	@WEEP TIME] .		. . . . .	.		. .	. . . . . . . . . . . . . . . . . . . . . . . . . . ..

7.Press SWEEP (SINGLE] and wait for completion of the sweep.

8.Press DISPLAY LINE [ENTER). Using DATA knob, place display line at the apparent average amplitude of the noise trace (see Figure 2-23).

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