HP 8559A Using the procedure of NOTE in step, Set function generator frequency to 200 kHz, 13, div, 0.5%), Span Width Error, Output Frequency, Spectrum Analyzer

PERFORMANCE TESTS MODEL8559A

PERFORMANCE TESTS

4-11.FREQUENCY SPAN ACCURACY (Cont'd)

13.Set function generator frequency to 200 kHz (k0.5%) 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 k0.4division.

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 frequency 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
I	Spectrum Analyzer			Span Width Error
			Function Generator
	FREQ SPANIDIV	RESOLUTION BW	Output Frequency*
	100 kHz	OPTIMUM	100 kHz	k0.4 div.	-div.
	50 kHz	OPTIMUM	50 kHz	+0.4 div.	-div.
	20 kHz	OPTIMUM	20 kHz	k0.4 div.	-div.
	10kHz	OPTIMUM	10kHz	k0.4 div.	-div.

*Check function generator output frequency using a frequency counter. Frequency readout should be within f0.5% of desired audio frequency.