HP 8559A BNCTee, Signal Generator, FunctionGenerator, 50 MHz Universal Counter, 4-24.SWEEP TlME ACCURACY

PERFORMANCE TESTS MODEL8559A

PERFORMANCE TESTS

4-24. SWEEP TlME ACCURACY

SPECIFICATION:

There are 20 selectable and calibrated sweep times in a 1-2-5 sequence from 2 pec/DIV to 10 sec/DIV (excluding 2 sec/DIV).

Sweep time accuracy: +10% ( f20% for 5 and 10 sec/DIV)

DESCRIPTION:

For SWEEP TIME/DIV control settings of 10 msec and less, the triangle-wave output of a function generator is used to modulate a 100-MHzsignal applied to the spectrum analyzer input. This signal is demodulated in zero span, displaying a triangular waveform on the CRT. The function genertor is tuned to align the waveform with the vertical CRT graticule lines. The period of the function generator output is then measured with a counter to determine the sweep time.

For SWEEP TIME/DIV control settings of 20 msec and greater, the display (AUX B) PENLIFT/BLANKING output is connected directly to the counter. The blanking signal is "low" during a spectrum analyzer sweep; the time interval between the falling and rising edges is measured to determine the sweep speed.

FUNCT l ON

ELECTRICQENERATOR

COUNTER

I

I

BNC

TEESPECTRUMi

ANALYZER

	SIGNAL GENERATOR	I	AUXPEN1Bl F T l
		I
			BLANK	lNG
IAM		RF
	lNPUT	IOUTPUT

RQ 2141U CABLE

FIGURE4-19. SWEEP TlME ACCURACYTESTSETUP
EQUIPMENT:
Signal Generator .........................................................	HP 8640B
FunctionGenerator ......................................................	HP3310A
50 MHz Universal Counter ..........................................	HP 5300B/5302A
BNCTee ............................................................	HP1250-0781
Cable Assembly RG-214/U with Type N Connectors ..........................	HP 115WA