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Model8555A
Operation
SECTION Ill
OPERATION
3-1. INTRODUCTION
3-2. This section provides complete operation in-
structions for the HP 8555A/8552A/140-series
Spectrum Analyzer. Front panel controls, connec-
tors and indicators, for the 8555A RF Section, are
identified and described in Figure 3-1. Controls
and indicators, for a typical Display Section and
IF Section, are identified and described in Figure
3-2. Refer to the appropriate IF Section and Dis-
play Section manuals for identification and
description of controls, indicators, and connectors
not contained in this manual. Operational adjust-
ments are detailed in Figure 3-3 and general opera-
ting instructions are provided in Figures 3-4
through 3-6.
3-3. PANEL FEATURES
3-4. Front panel features of the 8555A RF Sec-
tion are described in Figure 3-1. Front and rear
panel views of the HP 8555A/8552A/140T Spec-
trum Analyzer are shown in Figure 3-3. For a
detailed description of the IF Section and Display
Section controls and indicators, refer to the opera-
tion and service manuals for those instruments.
Interconnection wiring between the RF Section
and the IF Section and between the RF Section
and the Display Section is contained in Section
VIII of this manual.
3-5. OPERATOR'S CHECKS
3-6. Upon receipt of the instrument, or when one
or more sections of the analyzer are changed, per-
form the operational adjustment procedures listed
in Figure 3-3. This procedure corrects for minor
differences between units and ensures that the RF
Section, IF Section and Display Section are
properly matched.
3-7. OPERATING INSTRUCTIONS
3-8. General operating instructions are contained
in Figure 3-4. These instructions will familiarize
the operator with basic operating functions of the
spectrum analyzer. Additional information cover-
ing signal identifying techniques and external
mixer operation is contained in Figures 3-5 and
3-6.
3-9. CONTROLS, INDICATORS AND
CONNECTORS
3-10. Front panel controls, indicators, and connec-
tors are identified and briefly described in Figures
3-1 and 3-2. Operational Adjustment procedures
are given in Figure 3-3. Additional information, to
assist the user during instrument operation, is
given in the following paragraphs.
3-11. RF
Input. The RF Section is normally
shipped with a Type N input connector. (Option
001 instruments are shipped with a Type APC-7
input connector.) Refer to Section VI for part
numbers associated with connector Jl. (See Input
Mixer Diode Characteristics below.) The mixer
diode, in the First Converter Assembly A12, will
burn out if overloaded. This diode is not separately
replaceable; it is part of a thin film microcircuit
enclosed in the sealed assembly. To protect the
mixer diode it is a good operating practice to
always set the INPUT ATTENUATION control to
50 dB before connecting the signal input.
DO NOT EXCEED THE FOLLOWING
MAXIMUM INPUT LEVELS:
Maximum
POWER
1
VOLTS
2
Input
Levels
dBm
Watts
DC
Rms
Input
Peak
0.01-18 GHz
+33
2
±20
20
14.14
Connector
Incident on
+10
10mW
±20
0.707
1.0
Input Mixer
l The INPUT ATTENUATION control must be in the .30 dB
or greater position when applying +33 dBm or input mixer
will be damaged. 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 106 volts per second. Do not change IN-
PUT A'rTENUATION levels when de voltages are applied to
RF INPUT Connector.
Do not connect impulse generators to 8555A
input.
These mechanical type switching de-
vices can generate pulses in excess of 300 volts.
The broadband output from impulse genera·
tors can destroy both input attenuator and
first converter. See additional information in
paragraphs 3-11 through 3-13 of Operating and
Service manual prior to instrument operation.
3-1
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