PERFORMANCETESTS

MODEL 8559A

PERFORMANCE TESTS

 

4-15. RESOLUTION BANDWIDTH ACCURACY (Cont'd)

 

Signal Generator:

 

COUNTERMODE ..............................................

INT,EXPANDXlO

AM ........................................................................

OFF

FM ........................................................................

OFF

FREQUENCYTUNE ....................................................

21.4MHz

RF ..........................................................................

ON

OUTPUTLEVEL ......................................................

--3dBm

Connect equipment as shown in Figure 4-10.

 

NOTE

 

For early instruments that do not feature A16J3, a 21.4-MHz signal can be injected directly into the 300-MHz output (A1OJ1)of Third Converter Assembly A10. Set the signal generator OUTPUT LEVEL to 0 dBm and use the spectrum analyzer REFERENCE LEVEL and REF LEVEL FINE controls in step 14 (=- 40 dBm) to position the trace at 7.1 divisions above the graticule baseline.

Adjust signal generator frequency until spectrum analyzer trace is at peak. Set signal generator OUTPUT LEVEL to position trace at 7.1 divisions above graticule baseline. Set COUNTER MODE to EXPAND XlOO (most significant digit will overflow).

Tune signal generator frequency until trace drops to 5 divisions above graticule baseline. Record signal generator frequency.

MHz

Tune signal generator frequency in direction opposite to that of step 15 until trace peaks (7.1 divisions above graticule baseline) and then drops to 5 divisions above graticule baseline. Record signal generator frequency.

MHz

Calculate and record resolution bandwidth at 3-dB points (difference between frequencies recorded in steps 15 and 16).

Min.ActualMax.

25.0 kHz

 

34.50 kHz

Set RESOLUTION BW to 10 kHz, leaving FREQ SPAWDIV set to 0.Repeat steps 14 through 17.

Min.ActualMax.

8.0 kHz

 

11S O kHz