Tektronix 1L30 Instruction Manual page 8

Operating Instructions— Type 1L30
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reference coordinate. When referred to a control (e.g., In­
termediate Frequency Center Frequency Range) the term
indicates the amount of frequency change available with the
control.
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Dispersion (sweep width)— The frequency sweep excursion
over the frequency axis of the display. Can be expressed as
-frequency/full frequency axis, or frequency (Hz)/division in
a linear display.
Display flatness— Uniformity of amplitude response over
the rated maximum dispersion (usually in units of dB).
Drift (frequency drift)
changes or instabilities caused by a frequency change in
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the spectrum analyzer local oscillators. Drift limits the time
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interval that a spectrum analyzer can be used without re-
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tuning or resetting the front panel controls (units may be
H z/sr H z /° C , etc).
Dynamic range (on screen)— The maximum ratio of sig­
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nal amplitudes that can be simultaneously observed within
the graticule (usually in units of dB).
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Dynamic range (maximum useful)— The ratio between the
maximum input power and the spectrum analyzer sensitivity
(usually in units of dB).
Frequency band— A range of frequencies that can be
covered without switching.
Frequency scale— The range of frequencies that can be
read on one line of the frequency indicating dial.
2-2
t o AIL POINTS
MARKED — 1 5 0 V (DEC.)
FROM PIN 1 V154A
(TIME-BASE GEN. A DIAG.)
Fig. 2-2. Change as indicated on this partial schematic of the Vertical Amplifier.
(stability)— Long term frequency
Incidental frequency modulation (residual frequency mod­
ulation)— Short term frequency jitter or undesired frequency
deviation caused by instabilities in the spectrum analyzer
local oscillators. Incidental frequency modulation limits the
usuable resolution and dispersion (in units of Hz).
Incremental linearity— A term
aberrations seen as non-linearities for narrow dispersions.
Linear display— A display in which the vertical deflection
is a linear function of the input signal voltage.
Linearity (dispersion linearity)— Measure of the comparison
of frequency across the dispersion to a straight line fre­
quency change. Measured
equally spaced (in frequency)
the dispersion and observing the positional deviation of
the markers from an idealized sweep as measured against
a linear graticule. Linearity accuracy, expressed as a per-
A W
centage, is within —- X 100% where AW is maximum
W
positional deviation and W is the full graticule width.
Maximum input power— The upper level of input power
that the spectrum analyzer can accommodate v/ithout de­
gradation in performance (spurious responses and signal
compression). (Usually in units of dBm.)
Minimum usable dispersion— The
obtainable for meaningful analysis.
the incidental frequency m odulation when limited by inciden­
tal frequency m odulation (in units of Hz).
VERTICAL
SIGNAL
OUT CF
V1223A /Type 545)
1 /2 6 D J 8 \ VT050V /
+ 320
used to describe local
by displaying a quantity of
frequency markers across
narrowest dispersion
Defined as ten times
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1
;? s
X
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