Characteristic

ReferenceLevel

Range

Log Mode

LinearMode

Accuracy

Steps

10 dB/divLogMode

2dBldiv Log Mode

LinearMode

Specification_ 494A1494ApService,Vot.1

AMPLITUDERELATEDCHARAiTERISTICS

tal Informalion

Top of the graticule.

From-117dBmto +50 dBm;

+50 dBm inctudes20 dB of tF gain reduction(+30 dBm is the maximum safeinput).Alternatereferencelevels arei

. dBV(-130dBVto +97 dBV)

o dBrnv(-70dBmVto +97 dBmV)

o dBpV (-10 dBpV to +157 dBpV)

39.6nV/Divto 2.8 v/Div (Maximumsafeinputlevelis .t W cw o r l 0 V p e a k )

Dependenton the foltowing charac-

teristics:

. RFAttenuationAccuracy

o lF GainAccuracy

r ResolutionBandwidth

. DisplayMode

o CalibratorAccuracy

. FrequencyBand

o FrequencyResponse

o <blue-SHIFT>CALroutinere_ duceserror,betweenresolution bandwidthsat -20dBmREF

LEVELOther. referencelevels mayhavelargererrors.

o AmbientTemperatureChange (+0.15dB/"Cmaximum)

The inputRF attenuatorsteps10 dB for referencelevel changes above -30dBm (-20 dBm when MtN NOISEis active)unlessthe MIN RF ATTENsettingis greaterthanzero.

ThelF gainincreases10 dB for each 10 dB referencelevelchangebelow -30dBm (20dBmwhenMtNNOISE is active)

'1

0 dB for the Coarse Mode

1 dB for the Fine Mode

1 dB for the CoarseMode

0.25 dB for the Fine Mode

1-2-5sequencefor Coarse Mode

1 dB equivalentsteps for Fine Mode

2-7

Page 33
Image 33
Tektronix 494AP service manual Accuracy Steps 10 dB/divLogMode