Tektronix 494AP service manual A o a o o, Digitalstorageterms

o o o

O

o o

to

o

t

o

I

o

O

o o o

I

o

Sensitvity. MeasureoJa.spectrurnanalyzefs abilityto

display minimumreversignars, -ifei in vorts or

decibets. Intermediate. "*pi".J"o

tr"qu"n"V bandwidth,

displaymode,and anyotherinnueniinji"'.to* mustbe given.

Spu.rious Response. A respons€ of a spectrum analyzerwhEreinthe _.

displayed'frequencynot related to the inputfrequency.

Hum Sidebands. Undesired responses cr€ated
within the spectrum analyzer,			on	the
display, that	are	"pp"urlng
		separated trom the	desired
responseby the fundamental				the
		or harmonicof
powerlinefrequency.

Noise Sldebands.Undesiredresponsecaused by noiseinternalto the spectrurnanalyzerappearingon the displayarounda desired,".ponr".

Resldual Response.A spurious responsein the absence.ofan inputsignal.(Noiseund:r.ro pip are excluded.)

Glossary_ 4g4Al4g4ApService,Vol. 1

View (Display). Enables viewing of contents of the chosenmemorysection(e.g.,'.Vidw

tents of memory A; ',View A, displaysthe con- B" displaysthe contentsof

memoryB).

Max Hold (peak Mode), Digitallystored displaymode which,at eachfrequencyaddresi,comparesthsincom- ing signal level to the stored level and retains the greater.ln this mode, the displayindicatesthe peak

-

lev€l at each frequency after several successive sweeps.

Scan Address.A numberrepresentingeach horizontal data position increment on a direited Ueam type display.An address in a memory is associatedwith eachscanaddress.

Volatile/Non-volatileStorage.A volatilestoragesystem is one whereany total loss of powerto the systemwill result in a loss of stored information. Non-volatiteI"Tory is not subjectto the instrumentpower supply for its storage.

o

O

o o a o a o o

I

O

I

o

Io

o

I Io

o

O

o o

DIGITALSTORAGETERMS

DigitatfyStoredDisptay-A.disptaymethodwherebythe displayedfunctionis held_.in'a'digitalmemory.tne

displayis generated

by readingthe dita ouf ot mernory.

Digltally-Averaged Display.A disptayof the average value of digitizeddata computedby combiningserial samples.

MultipleDisptayMemory.A digitailystored
in_gmultiple		disptayhav,
separately memorysectionswtrictr		b" displayed
or simultaneously.	""n

Clear (Erase).presets memoryto a prescribedstate, usuallythat denotingzero.

Save. A functionwhich.inhibitsstorageupdate,saving existingdata in a sectionof a multif,le,i"rory 1".g,, SaveA).

WAVEFORMMARKERTERMS

Live Trace. Any combination of the A trace and/or the B trace when SAVE A is off.

Active Trace. Live Trace or the B-SAVE A trace (a trace recalled into B is not an active trace).

Inactive Trace. SAVE A trace or a trace recalled into the B display before the sweep is started.

Primary Marker. The marker displayed in the Single Marker mode whose frequency and/or position is gllseo when tuning with the CENTER/MARKER FRE_ QUENCY control. When two markers are displayed, the brightest marker is the primary marker.

Secondary Marker. The "second,, marker; displayed only in the Delta Marker mode.

o

A-3

I