PERFORMANCETESTS

MODEL 8559A

PERFORMANCE TESTS

4.21.BANDWIDTH SWITCHING (AMPLITUDE VARIATION)

SPECIFICATION:

Bandwidths3 MHz to 300 kHz: <+0.5 dB

Bandwidths 3 MHz to 1 kHz: <+1.O dB

DESCRIPTION:

The CAL OUTPUT signal is applied to INPUT 50Qconnector and displayed on CRT. The peak of displayed 35-MHz signal is centered on CRT and adjusted for a vertical deflection of several divisions. The amplitude variation of the signal is measured for each RESOLUTION BW control setting. The overall variation between RESOLUTION BW settings of 3 MHz through 300 kHz should be less than 1.0 dB (k0.5 dB). The overall variation between RESOLUTION BW settings of 3 MHz through 1 kHz should be less than 2.0 dB (k1.0 dB).

PROCEDURE:

 

Set spectrum analyzer controls as follows:

 

FREQUENCYBANDGHz ..................................................

.01-3

TUNING .............................................................

0.035GHz

FREQSPAN/DIV ..........................................................

lMHz

RESOLUTION BW ...............................................

3 MHz, uncoupled

INPUT AlTEN .............................................................

10 dB

REFERENCE LEVEL .......................................................

0 dBm

REFLEVELFINE ...........................................................

-10

Amplitudescale .........................................................

IdB/DIV

SWEEP TIME/DIV ........................................................

AUTO

SWEEPTRIGGER .....................................................

FREERUN

ALTIF .....................................................................

OFF

SIG IDENT .................................................................

OFF

BLCLIP ....................................................................

OFF

VIDEOFILTER .............................................................

OFF

Connect CAL OUTPUT signal to INPUT 5(X2 connector.

 

Adjust TUNING control to center 35-MHz signal on CRT.

 

Adjust REF LEVEL FINE control to position peak of signal seven divisions above graticule baseline.

Set RESOLUTION BW and FREQ SPAN/DIV controls to settings indicated in Table 4-8. Record deviation of signal peak from referencegraticule line for each RESOLUTION BW control setting. Values above reference line set in step 4 are positive (+); values below reference line are negative (-).

To find overall variation in Table 4-8,algebraically subtract greatest negative amplitude deviation from greatest positive amplitude deviation. If all changes in amplitude are of the same sign, overall variation is largest positive or largest negative change in amplitude. Overall variation between 3 MHz and 300 kHz RESOLUTION BW setting should be <1.0 dB (k0.5 dB). Overall variation between 3 MHz and 1 kHz RESOLUTION BW settings should be <2.0 dB ( +1.0 dB).