HP 8555A Service Manual

General Information
5. Observe the following maximum input
levels:
Maximum
PO:wer
Volts
Input Levels
dBm Watts De
Rms Peak
Input .01·18 GHz
+33
1
2'
±20
2
10
14.4
Connector
Incident on In-
+10 10 mW ±20
2
0.707 1.0
put Mixer
1
The Input Attenuation Control must be in the 30 dB or greater
position when applying +33 dBm or input Mixer will be dam·
aged.
The power levels listed apply for peak or average power.
2
Do not exceed ±20 volts de. Apply only de voltages with rise
times less than 10
6
volts per second,
1-9. INSTRUMENTS COVERED BY MANUAL
1-10. This instrument has a two-part serial number
(see Figure 1-3). The first four digits and the letter
comprise
the serial number prefix. The last five
digits form
the sequential suffix that is unique to
each instrument.
SERIAL PREFIX
Figure 1-3. Instrument Identification
The contents of this manual apply directly to
instruments having the same serial number pre-
fix( es) as listed under SERIAL NUMBERS on the
title page.
1-11. An
instrument manufactured after the print-
ing of this manual may have a serial prefix that is
·not listed on the title page. This unlisted serial
prefix indicates
that the instrument is different
from those documented in this manual. The
manual. for this instrument is supplied with a
yellow Manual Changes
supplement that contains
"change information" that documents the differ-
ences.
1-2
Model8555A
1-12. In addition to change information, the sup-
plement may contain information for correcting
errors in the manual. To keep this manual as
current and accurate as possible, Hewlett-Packard
recommends that you periodically request the
latest Manual Changes supplement. The supple-
ment for this manual is keyed to this manual's
print date and part number, both of which appear
on the title page. Complimentary copies of the
supplement are available from Hewlett-Packard.
1-13. For information concerning a serial number
prefix not listed on the title page or in the Manual
Changes
supplement, contact your nearest Hewlett-
Packard office.
1-14.
DESCRIPTION
1-15. The HP Model 8555A Spectrum Analyzer
RF Section is shown in Figure 1-1 with the Model
8552B Spectrum Analyzer IF Section and the
Model 141 T Display Section. Table 1-1, Specifica-
tions, and Table 1-2, Supplemental Performance
Characteristics, are for the 8555A RF Section
when used with an 8552A!B IF Section and a
140-series Display Section.
1-16. The 8555A plug-in is the microwave RF
Section for use with the 8552-series IF section and
the 140-series display section. Together they
comprise a receiver that electronically scans an
input signal and provides a visual display in the
frequency domain. Input signal amplitude is
plotted on the CRT as a function of frequency.
The amplitude (Y-axis) of the CRT is calibrated in
absolute units of power (dBm) or voltage (pV/mV)
(50-ohm system): accordingly, absolute and rela-
tive measurements of both amplitude and fre-
quency can be made.
1-17. The analyzer RF and IF sections form a
highly sensitive
super-heterodyne receiver with
spectrum-scanning capabilities over the frequency
range of 10 MHz to 40 GHz in 14 frequency bands.
The analyzer presents a calibrated CRT display up
to 2 GHz wide. Absolute calibration accuracy is
maintained from 10 MHz to 18.0 GHz in 10 bands,
using internal mixing. The frequency range from
12.4 GHz to 40 GHz is covered in 4 bands through
the use of external mixers.
1-18. Instrument controls are arranged so that the
operator can identify, type, and measure signal
parameters with a minimum of switching. For
wide-spectrum analysis, the operator can choose a
preset scan width covering the full range of each
frequency band. For a more detailed study, the
spectrum width can be progressively narrowed to

HP 8555A Specifications

General

Brand	HP
Model	8555A
Category	Measuring Instruments
Language	English