Tektronix 494AP service manual Vertcal, Dtsplay 2 dB/DtV, Tme/Dv Ext

		PerfonnanceCheck procedure -	4g4ful4g4Ap
			ServiceVol. l
a. Connectthe test eguiprn€nt
4-22.Set the Spectrumenityzer	as shown in Figure
	"ontroi, "i	fouows:
VERTCAL		Pioa€
DTSPLAY 2 dB/DtV
TME/DV	EXT	POWEF

VIEWA andVEWB Otr

b. Set the functiongenerator
(0v).	controlsfor no output
c. Use thE POSITION		positionthe crt
beam the left graticule "ontroi to
-on	edge. This'est;btishes
		the
0 V reference.

d.Resetthe functiongeneratoroutputfrequencyto 1 kHz,and increaseits outputlevelfor trti t O-Oiri"ion

sweepon the SpectrumAnalyzer. "

e. Checkthat the functiongeneratoroutputlevelis 20 V peak-to-peak

*2 V.

A variablevoltage source can be used in plac€ of the function generatorto check external sweep operation, lf used. the rangewouldbe 0V to +10 V.

f, Disconnectand remove the test equipment. ReturnTIME/DIVto AUTO.

Test Oscltloscope

\s7/^t

t 1 5 V M A X

CAUTION

JIdACC-ESSORIT pin t, Video Setecr -

o o o o o o o ? t o o o o o o o o o c o c o o o o

NOT RS232 COMPATIBLE

Place jumper between pin I antl pin 5 lo selecl

EXTERNALVIDEO.

Figure4-21. Extemalvldeo select plns and MARKER

InputIVIDEO

Funclion Generato.

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Spectrum Analyzer Under Test

(Rear Panel)

Figure 4'22'Test equipment setup for checking external triggering and horizontal input characteristics.

4-33