Tektronix 494AP Vertical, Display 21BIDIV, Narrowvtdeofilter, TIME/DIV Auto, Partiii

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I

PerformanceCheckprocedure- 4g4Al4g4Ap

Servlce

)

Vol. 1

o

l.

Establisha referencesetting for the first 10 dB

b. Connect

o

incrementby pressingdB[Ref on tie po*"i meter.

4-15. Set

the test eguipmentas shown in Figure

o

the SpectrumAnatyzer

m. Increasethe tr4tNRF ATTEN

dB settingby 10

controlsas followj:

and reset the REFERENCE

o

LEVEL10 dB higher

CENTERFREQUENCY

Test

the levetset in part j. Resettn" !"n"i"i*

than

Frequency

outputlevel

SPAN/DlV

o

for a power meter reading

RESOLUTIONBANDWIDTH

200kHz

of +16 Oe. Eeter to Tabte

1 MHz

4-6 for setupinformationai eachrf attenuaiorsetting.

REF LEVEL

a

n. check that the differencebetweenthe

-25 dBm

SAVEA

MIN RF ATTEN dB

50

I

and VIEW.B_displays

.t.A

MIN NOISE

i9 t^e1than0.5dB

up to

GHz,

On

lessthan1.5dB from 1.9

GHzto f

g

VERTICAL

o

Gftz,lnd'notetessthan

DISPLAY

21BIDIV

3.0 dB from 1g GHz to 21 GHz. frrt"f."'"

of the

NARROWVTDEOFILTER

On

o

level differencebetween the SAVEA

and VIEWB

TIME/DIV

AUTO

displays.

PEAK/AVERAGE

FullyClockwise

I

o. Continueto cheekthe secondand third attenua-

VIEWA and VEWB

On

o

tor steps usingTable4;6 as a guidefor setupinforma-

tion. Make a note of the levelliference

at each step

^ c. !o1n_ectthe power sensorto the 1 mW/50MHz

t

settingbetweenthe SAVE

p.

A andVIEWB ctisptays.

PowerRef Outputport_onthe powermeterthroughan

Using the data

I

noted in step o of part I and

appropriate

adapter. Be sure that the 50 MHz iefer-

steps n and o of part lt, check that deviation

enceis turnedoff.

t

over the

entire60 dB rangeis lessthanI dB up to 1.gGHz,teis

d. On the powermeter,press

SensorZeroandwait

a

than 3dB from 1.gGHz

to lgGH;,

and tess than

6.0 dB

from1BGHz

for the zero light to turn off. Repeatuntit a zero is

attained.

to 21 GHz.

I

e. On the power rneter,set the 50 MHz reference

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PARTIII

on and set

the Cal Factor switchto the S0MHz refer-

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ence. Set the power meter Cal Adj for a 1.000mW

reading.

o

.a.

Dueto-outputpowerlimitations

of the signalgen-

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erator, a differenttest setup is required to test the

50-60

dB step of the RF Att€nuatorfoi frequencies

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above18 GHz.

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O

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o

o

I

o

30 TO 60

Table 4-6

dB RFATTENUATOR

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SpectrumAnalyzer

TESTSETTINGS

MIN RF ATTEN dB

ExternalAttenuator

PowerMeter

Max Power Meter

t

ReferenceLevel

Setting

dB(Rel)

Reading In dBm

o

-25 dBm

30 dB

20 dB

0 dB-Ref

-

- 15 dBm

40 dB

(Maximum 11dBm)

20 dB

+ 1 0 d B

(Maximum- 1 dBm)

a

-

- 15 dBm

40 dB

1 0d B

0 dB - Ref

-

t

-5 dBm

50 d8

(Maximum 11 dBm)

1 0 d B

+10 dB

-

I

-5

dBm

50 dB

(Maximum

1 dBm)

0 d B

0 dB:Ref

-

I

+5 dBm

60 dB

(Maximum 11dBm

0 d B

+ 1 0d B

(Maximum- 1 dBm)

a

o

o

t

4-23

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