Tektronix 494AP service manual O o a o o o o A o o o a

Specffication - 494A1494ApService, Vol. 1

Table 2.1 (Continued)

FREQUENCYRELATEDCHARACTERISTICS

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Characteristic

InitialAccuracy(continued)

B a n d s 1 & 5 - 1 2 w i t h SPAN/DIV(200 kHz, and Bands2-4 withSpAN/DlV (100 kHz

(1stLO locked)

PerformanceRequirement

t{20%D + (cF x REF) + (2N + 25)Hz)

Where:

D - SPAN/DVor RESOLUTTON BANDWIDTH, whichever is greater

CF : CenterFrequency

REF Reference Frequency Error

N : HarmonicNumber

Supplemental Information

Refer to lF Frequency,LO Range, and HarmonicNumberspecification laterin thistablefor the N value

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Drift	With constantambienttemperature
	andfixedcenterfrequency

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After30 minutewarmup

Bands 1 & 5-12 with SPANiDIV>200 kHz,and Bands2-4 withSPAN/DV >100kHz

(1stLO unlocked)

Bands 1 & 5 - 12 with SPAN/DIV(200 kHz, and

Bands 2-4 with SPAN/DtV (100 kHz

(1st LO locked)

Aftert hourwarmup

B a n d s 1 & 5 - 1 2 w i t h SPAN/DIV>200 kHz,and Bands2-4 withSpAN/DtV >100kHz

(1stLO unlocked)

B a n d s 1 & 5 - 1 2 w i t h SPAN/DIV(200 kHz,and Bands2-4 withSPANiDV (100 kHz

(1stLO locked)

ReadoutResolution

SignalCounter

Accuracy(with span to resolu- tionbandwidthratios(10:1)

(50 Hz per minute

*{(F x REF)+ (10 + 2N)Hz+ lLSD}

Where:

F - Center or Marker Frequency

and LSD

REF Reference Frequency

Error

N - HarmonicNumber

LSD : LeastSignificantDigit

Correctionwill occur at the end of the sweepfor sweeptimes>5 s/div

<(25 kHz)Nperminute

<150 Hz perminute

<(5 kHz)Nper minute

At least10% of SPAN/DIV

Refer to lF Frequency, LO Range, and Harmonic Number specification later in this table for the N value Count at center, marker, or delta markers

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