Marconi Instruments 2382 User manual

marconi
instruments
2382/2380
100HZ-400MHZ SPECTRUM
ANALYZER AND DISPLAY
Manual

Operating Manual
Prov
Sep«
H52382-900A
Vol. 1
100 Hz -400 MHz SPECTRUM ANALYZER and DISPLAY
2382/2380
Comprising:
100 Hz -400 MHz Spectrum Analyzer Type 2382
(Code No* 52382-900A)
and
Display Type 2380
(Code No. 52380-900E)
^^Harconl Instruments Ltd. 1985
Printed in the UK
Part No. 46881-489W
Print code: 8-9/85, MI 1.3c
4
85 Paee I

H52382-900A
Vol. I
CONTENTS
PEELIKINARIBS
Title page
Contents
Notes and Cautions
CHAPTERS
1General information
2Installation
3Operation
4-1 Brief technical description
4-2 Technical description
5Maintenance
6Replaceable parts
7Servicing diagrams
These chapters are
contained in a separate
volume available as an
optional accessory*
HAZARD WARNING SYMBOLS
The following symbols appear on the equipment:
Symbol Type of hazard Reference in manual
AStatic sensitive device Page (iv)
ADangerous voltages present Page (111)
ASupply voltage Page (111)
Note
Each page bears the date of the original issue or the code number and
date of the latest amendment (Am. Am. 2etc.). The title page always
shows the amendment status of the manual. New or amended material of
technical importance introduced by the latest amendment is Indicated by
triangles positioned thus Ato show the extent of the change.
When achapter is reissued the triangles do not appear.
Any changes subsequent to the latest amendment state of the manual are
included on Inserted sheets coded Cl, C2 etc.
page 11 July 85

H52382-900A
Vol. 1
NOTES AND CAUTIONS
ELECTRICAL SAFETY PRECAUTIONS
This equipment is protected in accordance with lEC Safety Class 1. It
has been designed and tested according to lEC Publication 348 «^Safety
Requirements for Electronic Measuring Apparatus^) and has been supplied in a
safe condition* The following precautions roust be observed by the user to
ensure safe operation and to retain the equipment in asafe condition*
Defects and abnorul stresses
Whenever it is likely that protection has been Impaired, for example as a
result of damage caused by severe conditions of transport or storage, the
equipment shall be made inoperative and be secured against any unintended
operation*
Removal of covers ^
Removal of the covers is likely to expose live parts although reasonable
precautions have been taken in the design of the equipment to shield such
parts. The equipment shall be disconnected from the supply before carrying
out any adjustment, replacement or maintenance and repair during which the
equipment shall be opened. If any adjustment, maintenance or repair under
voltage is Inevitable it shall only be carried out by askilled person who Is
aware of the hazard Involved*
Note that capacitors Inside the equipment may still be charged when the
equipment has been disconnected from the supply* Before carrying out any
work inside the equipment, capacitors connected to high voltage points should
be allowed to discharge through the bleed resistors fitted for the purpose;
do not attempt to remove the safety covers from the power supply until the
lamp under the top cover stops blinking* Should the unit be reconnected to
the supply with the safety covers removed and then disconnected, do not
attempt to discharge the power supply unity's main reservoir capacitors using a
shorting link as the equipment may be damaged* Discharge should always be
allowed to occur gradually*
Note also that the 12 kV e.h.t* circuit for the cathode ray tube retains
its charge for aconsiderable time after switch off. Therefore before any
handling is carried out in the vicinity of the cathode ray tube or e.h.t. unit
it is essential that the supply Is disconnected from the instrument and the
final anode lead Is shorted to the chassis several times immediately after
unplugging. The residual charge on the c.r.t. itself must also be removed by
shorting the anode connection to ground*
AC supply plug ^
The supply plug shall only be inserted in a socket outlet provided with a
protective ground contact. The protective action shall not be negated by the
use of an extension lead without protective conductor. Any Interruption of
the protective conductor inside or outside the equipment is likely to make the
equipment dangerous.
July 85 Page lit

H52382-900A
Vol. 1
Puses ^prlaary and secondary
Note that there is asupply fuse In both the line and neutral wires of
the supply lead* If only one of these fuses should rupture »certain parts of
the equipment could remain at supply potential.
To provide protection against breakdown of the supply lead, its
connectors, and filter where fitted, an external supply fuse (e.g. fitted In
the connecting plug) should be used in the live lead. The fuse should have a
continuous rating not exceeding 6A.
Make sure that only fuses with the required rated current and of the
specified type are used for replacement. The use of mended fuses and the
short-circuiting of fuse holders shall be avoided.
Anumber of secondary fuses are fitted to boards in the upper and lower
units. For details of both primary and secondary fuses refer to Performance
data -Chap. 1.'
CAUTION; STATIC SENSITIVE COHPONENTS
Components identified with the symbol Aon the circuit diagrams and/or
parts lists are static sensitive devices. The presence of such devices is
also indicated In the equipment by yellow discs, flags or labels bearing the
same symbol. Certain handling precautions must be observed to prevent these
components being permanently damaged by static charges or fast surges.
(1) If a printed board containing static sensitive components (as indicated
by awarning disc or flag) is removed, it must be temporarily stored in
aconductive plastic bag.
(2) If astatic sensitive component is to be removed or replaced the
following anti-static equipment must be used.
Awork bench with agrounded conductive surface.
Metallic tools grounded either permanently or by repeated discharges.
Alow-voltage grounded soldering iron.
Agrounded wrist strap and aconductive grounded seat cover for the
operator, whose outer clothing must not be of man-made fibre.
(3) As a general precaution, avoid touching the leads of astatic sensitive
component. When handling anew one, leave it in its conducting mount
until it is required for use.
(4) If using afreezer aerosol in fault finding, take care not to spray
programmable ICs as this may affect their contents.
WARNING: Hi^ODLING HAZARDS
This equipment is formed from metal pressings and, although every endeavour
has been made to remove sharp points and edges, care should be taken,
particularly when servicing the equipment, to avoid minor cuts.
Page iv July 85

H52382-900A
Vol. 1
Cathode ray tube: When exposing or handling the cathode ray tube care must be
taken to prevent implosion and possible scattering of glass fragments*
Handling should only be carried out by experienced personnel and the use of
safety mask and gloves is recommended* Adefective tube should be disposed
of in asafe manner by an authorized waste contractor*
WARNING: TOXIC HAZARD
Many of the electronic components used in this equipment employ resins and
other chemicals which give off toxic fumes on incineration. Appropriate
precautions should therefore be taken in the disposal of these items*
July 85 Page V

H523«2'-')00A.
Vol. 1
Chapter 1
GENERAL INFORHATION
CONTENTS
Para, Page
Features ••• ••• ,,, ••• »•» ••• ••• 2
1General
6The display
8The preset" mode
9The six mode horizontal scale
13 Amplitude measurements
16 Markers
19 Further highlights
20 Store/recall
21 Small signals
23 .Limit mask
24 Tracking generator
26 Intermodulatlon products
28 Overload protection
29 More detail
Performance data q
32 Frequency q
Measurement range
Frequency span
Frequency standard
Reference frequency
Markers
Resolution
Stability
Spectral purity
33 Amplitude ,,, ^ ^ ^
Measurement range
Displayed range
Display fidelity
Reference level
Frequency response
RF Input
Markers
Dynamic range
34 Sweep ig
Trigger source
Trigger mode
Sweep mode
Sweep time
35 Tracking generator 21
Tracking generator output
36 Display ••• ,,, ,,, 21
Display size
Trace
37 Remote operation (GPIB) 23
User accessible display
Service requests
Transfer formats
Transfer times
GPIB PLOT
July 85 Chap, i
Page 1

H52382-900A
Vol. 1
CONTENTS (continued)
Para
38
39
40
41
# # ### # Other featarea
STD 10 MHz output
47.4 MHz output (l.f. output)
Phones (Demodulated output)
Probe supply
Radio frequency Interference
Safety
Rated range of use
Conditions of storage and transport
Power requirements
Fuses
Dimensions &Weight
Options #•« •«
Beeper
Analog pen plot
Video output
RGB outputs
Versions «
•
2380 Display
2382 100 Hz-400 MHz Spectrum Analyzer
Access orles
Supplied accessories -2380 Display
Supplied accessories -2382 Spectrum Analyzer
Optional accessories -2380/2382
a#
•m•• a
• • a a• • • a
a•a• sa•
Page
24
28
28
Fig.
1The 100 Hz -400 MHz spectrum analyzer ..
2Typical spectrum analyzer resolution ••
3Typical SSB noise vs offset from carrier
4Optimum dynamic range ••• ... •«
5Typical sensitivity vs input frequency ..
3
12
13
17
18
20
FEATURES
General
1. The 2382 Fig. 1Is an exceptionally versatile general purpose spectrum
analyzer for use from 100 Hz up to 400 MHz. Although simple to operate It
has many functions which make it an Indispensable tool In research,
development, production, Installation, commissioning and maintenance. It
analyzes signals by separating them Into their frequency components and the
power or voltage level of each Is displayed as afunction of frequency, on a
c.r.t. Further facilities such as the display of amodulated signal, the
recovery of amodulating signal, the provision of atracking generator etc.
are also available.
2. The design of the 2382 incorporates many original and sophl st 1cated
features. This extends Its application In areas such as :
•Testing of h.f. and v.h.f. transmitters and receivers
•Interference monl torlng
Chap. 1
Page 2Sep. 85

I
H52382-900A
Vol, 1
July 85
Fig. 1The 100 Uz -400 MHz Spectrum Analyzer
Chap. 1
Page 3

H52382-900A
Vol. 1
Surveiilance
Signal source purity measurements
•Commissioning communication systems
•PCM and FDM system measurements
Measurements on CW, FM, and AM signals including :
non-linear modulation
hum sidebands
spurious FM on AM
carrier frequency
modulation frequency
deviation/modulation depth
•Displaying the characteristics of active and passive networks -
filters, amplifiers etc*
3. The instrument is amicroprocessor controlled swept tuned analyser of the
superheterodyne type* It comprises alower unit (2382) containing afre-
quency synthesizer and swept receiver, and an upper unit (2380) containing the
display, digital processing and power supply* The c*r*t. has aviewing area
of 140 mm x110 mm. Aminimum of multifunction front panel controls have
been used for simplicity and ease of operation*
4, The display is scaled In both frequency and amplitude for absolute and
relative measurement -advanced circuit design, digital error correction and
automatic self calibration give areference level accuracy of il dB,
5* For optimum control the operator may set the reference frequency, span,
and reference level using either akeypad or dedicated rotary controls* Full
GPIB talk and listen facilities are also provided*
The display
6* Two memory stores designated Aand Brecord the display, and the content
of either or both stores refreshes the horizontally scanned TV type raster.
The graticule, having 10 x 10 major divisions and five vertical and horizontal
minor sub-divisions, is electronically generated and the Aand Btraces can be
displayed against this background* The two traces Aand B, and the graticule,
have separate brightness controls to highlight one trace against the other or
against the graticule lines* In addition each trace may be Infilled or
outlined, according to user preference, to clarify the picture when the signal
is particularly complex. All these ensure that the display Is clear and easy
to Interpret and if the ''Options^ board is fitted it can be shown in colour on
an RGB video monitor by coupling this into asocket at the rear of the 2380*
7. The Aand Btraces have independently variable reference levels and
vertical scales* The levels relating to each are displayed adjacent to the
major graticule lines; those for the Atrace are on the left hand side of the
screen and those for the Btrace on the right hand side. Main control
settings are indicated as screen annotations not only for ease of operation
but also to provide an unambiguous photographic record if required. The
display can be protected from being overwritten by using the "SAVE"' mode.
Additional information can be typed into atext area at the top of the screen
Chap *1
Page 4July 85