Specification—492/492P Service Vol. I (SN B030000 & up)
SPECIFICATION
The following list of instrument characteristics and fea
tures apply to the basic 492/492P Spectrum Analyzer after
a 30-minute warmup, except as noted. Changes to the basic
specifications due to the addition of options follow the basic
listings.
Differences in the electrical and environmental character
istics for the rackmount/bench versions of the 492/492P are
described in the Rackmount/Benchtop section of this man
ual. Refer to section
6
for this information.
The Performance Requirement column describes the lim
its of the characteristic, and the Supplemental column de
scribes features and typical values or information that may
be useful to the user. Procedures to verify performance re
quirements are provided in the Calibration section of the
Service instructions. The Performance Check procedures
require sophisticated equipment as well as technical exper
tise to perform.
The Operators Manual contains a procedure that checks
all functions of the 492/492P. This check is recommended
for incoming inspections to verify that the instrument is func
tioning properly.
Table 1-1
ELECTRICAL CHARACTERISTICS
Characteristic
Performance Requirement
Supplemental Information
FREQUENCY RELATED
Center Frequency
Range (Internal Mixer)
50 kHz to 21 GHz
Frequency response degraded by 1 dB before
100 kHz.
Accuracy
(after
2
hour warm up)
±(5 MHz + 20% of span/div) n or
± (
0
.
2
% of the center frequency +
2 0
%
of the span/div) whichever is greater.
Readout Resolution
Within 1 MHz.
TUNE command accuracy
(492P only under remote con
trol) after a
2
hour warmup.
1 st LO Tuning
Band
Freq Span/Div
1-3
> 50 kHz
4
>100 kHz
5-11
>200 kHz
± (7% of tune amount or ± 150 kHz) n
whichever is greater. (See listing of IF fre
quency, LO range, and harmonic number
that follows, for value of n.)
2nd LO Tuning
1-3
< 50 kHz
4
<100 kHz
± (7% of tune amount)
5-11
«200 kHz
Repeatability accuracy (return
to a previous frequency
setting) with an ambient
temperature change <
1 0
°C
(492P only under remote con
trol).
Residual FM (short term)
after
2
hour warm up
*£(1 kHz peak-to-peak) n for a period
of 20 ms, n is the 1 st LO harmonic
number used in the
1
st mixer conversion,
and related to the selected frequency
range (band).
No video filter.
±(2 MHz + 10% of Span/Div) or ±(0.1% of
frequency + 10% of Span/Div) whichever is
greater.
1-4
REV NOV 1982
