Tektronix 494A ReferenceLevel SEt With Data ENTRYpush Buttons, DisplayDynamicRange Accuracy

Specification - 494A!494Ap Service, Vol. 1

Table 2-2 (Continued)

AMPLITUDERELATEDCHARACTERISTICS

Characteristic

ReferenceLevel(continued)

SEt With DATA ENTRYpush-

buttons

VerticalDisplay Modes

SupplementalInformation

Steps correspond to the disptay mode in coarse; except, tor 2 dB whenthe stepsare 1 dB.

In FineMode:

1 dB whenthe modeis 5 dB/divor more

0.25dB for display modes of 4 dB/div or less (referred to as DeltaA Mode)

10 dB/Div, 2 dB/Div, and Linear - any integer between 1-1 5 dBlDiv can also be selected with the DATA ENTRYpushbuttons.

DisplayDynamicRange Accuracy

10 dB/div Log Mode

2 dBldiv Log Mode

Linear Mode

RF Attenuatol

Range

Accuracy

Dcto 1 . 8GHz

1 . 8 G H z t o ' l 8

G H z

18 GHz to 2'lGHz

Marker(s)

90 dB maximumfor Log mode

slonsfor Linearmode

*1.0 dB/l0 dB to a maximumcumu- +4.0 dB maximumcumulativeerror lativeerror of *2.0 dB over B0 dB over90 dB range

range

40,4 dBP.A dB to a maximum cumulativeerroro,f+1.0 dB over16 dB range

t5o/" ot full scale

0-60 dB in 10 dB steps

Within 0 . 5 dB/10 dB to a maximum of 1 dB over the 60 dB range

Within 1 . 5 dB/10 dB to a maximum of 3 dB over the 60 dB range

Within3 . 0 dB/10 dB to a maximum

of 6 dB overthe60 dB range

When activated, the marker is a bright dot positioned by the

CENTER/MARKER FREQUENCY control,

Accuracy (Normal or Delta

Mode)

Gain Variation Between Resolution

Bandwidths

3 M H z F i	< i 0 . 4 d B
Two Filters

ldentical to REF LEVEL accuracy pluscumulativeerrorof displayscale (dependenton verticalposition)

Measurementconditions: o measuredat -20dBm

o MinimumDistortionMode

o after front-panelCAL adjustments

2-8