Section
1
General Information
DESCRIPTION
The
54XA
series counters are microprocessor-based heterodyne instruments. The
545A
and
548A
span the
frequency range from
10
Hz to
18
GHz and
10
HZ to
26.5
GHz, respectively. The model
548A,
when
equipped with frequency extension capability (Option
06),
is used in conjunction with
a
remote sensor
(See Model
590)
to measure up to
110
GHz.
Using keyboard control, the
54XA
series counters provide frequency offsets and frequency selectivity.
Options include Power Measurement, full Systems capability via GPIB or
BCDIRemote Programming
and
D/A
Converter output.
Full frequency range
is
covered in three bands. Band
1
is
a
high impedance input
(1
M
ohm120 pF), and
spans
a
10
Hz to
100
MHz range, with a sensitivity of
25
mV RMS. Band
2
has an input impedance of
50
ohms, a
10
MHz to
1
GHz range, with a sensitivity of
-20
dBm.
Band
3
has an input impedance of
50
ohms nominal over
a
range of
1
GHz to
18
(or
26.5)
GHz, and
a
sensitivity to
-30
dBm. For frequencies
above
26.5
GHz
a
remote sensor, with an appropriate waveguide input, is called Band
4.
Measurements are presented on
a
12
digit
LED
display that
is
sectionalized to read GHz, MHz, kHz, and
Hz. When the optional power measurement function
is
activated, the digits on the far right display power
in
dBm with
.I
dB resolution, and frequency resolution
is
limited to
100
kHz.
Scans by ArtekMedia © 2007
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