Tektronix 492 Instruction Manual page 13

mation and Specification—492/492P Operators
Characteristic
Performance Requirement Supplemental Information
FREQUENCY RELATED (co: nt)
Residual FM (short term)
(1 kHz peak-to-peak} n for a period
of 20 ms. nis the 1st LO harmonic
number used in the 1st mixer
conversion, and related to the selected
frequency range (band).
No video filter.
Frequency Drift after
2 hour warmup at a
<200 kHz/hour, fundamental
mixing.
A re-stabilization time of 10 minutes
per GHz of frequency change must be allowed
if the center frequency is retuned.
"Static" Resolution Band-
1 kHz to 1 MHz in decade steps, plus an
automatic (AUTO position). Resolution
bandwidth (6 dB down) is within 20% of
the bandwidth selected.
In AUTO position the bandwidth is.
computed by an internal computer,
based on the span/div, video filters,
time/div, and vertical display selections.
When both the TIME/DIV and
RESOLUTION BANDWIDTH are in
AUTO position, the resolution bandwidth
is a function of the FREQUENCY
SPAN/DIV selection.
Shape Factor (60 dB/6 dB)
Noise Sidebands At least -75 dBe at 30 times the
resolution offset (70 dBe for 1 kHz
resolution bandwidth) for
fundamental mixing.
Video Filter
Narrow Reduces video bandwidth to approximately
1/300th of the selected resolution
bandwidth.
Wide Reduces video bandwidth to approximately
1/30th of the selected resolution
bandwidth.
REV B JAN 1981
1-3