Marconi 52017-900K User manual

c
Operating Manual
H 52017-9OOK
Vol. I
lOkHz-1024MH~
AM/FM SIGNAL GENERATOR
2017
Code No. 52017-900K
0
1980
MARCONI INSTRUMENTS LIMITED
ST. ALBANS HERTFORDSHIRE ENGLAND
May 90 (Am. 6) Part no. 46881-388D
Print code : 5 - 5/90, MI 0.5~
Page (i)

H 52017-900K
Vol. 1
CONTENTS
PRELIMIFJARI ES
Title page
Contents
Notes and cautions
CHAPTERS
1 General information
2 Installation
3 Operation
4 - 1 Brief technical description
4
- 2 Technical description
5 Maintenance
6 Replaceable parts
7 Servicing diagrams
These chapters are contained
in a separate volume available
as an optional extra.
HAZARD WARN I FIG SY MEOLS
The following sqrmbols appear on the equipment.
symbo z Type of hazard Reference in manual
A Static sensitive device Page (iv)
A Incorrect adjustment Chap. 3 , para. 30
Page (iv)
A beryllia
A AC voltages Page (iv)
C omponent con t a i ning
Note.. .
Each page bears the date of the original issue or the code number and
date
of the latest amendment (Am.1, Am.2 etc.). New or amended material
of technical importance introduced by the latest amendment is indicated
by triangles positioned thus
change.
..... to show the extent of the
When
8 chapter is reissued the triangles do not appear.
Any changes subsequent to the latest amendment state
of the manual are
included on inserted sheets coded C1, C2 etc.
J
Page (ii)
Dec. 80

H 5201 7-900K
Vol. 1
NOTES AND CAUTIONS
1
ELECTRICAL SAFETY PRECAUTIONS
This equipment is protected in accordance with IEC Safety Class 1.
It has been
The following pre
-
designed and tested according to IEC Publication 348, 'Safety Requirements for Electronic
Measuring Apparatus', and has been supplied in a safe condition.
cautions must be observed by the user to ensure safe operation and to retain the equip
-
ment in a safe condition.
Defects and abnormal 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.
shall be disconnected from the supply before carrying out any adjustment, replacement or
maintenance and repair during which the equipment shall be opened.
maintenance or repair under voltage is inevitable
it shall only be carried out by a
skilled person who is aware of the hazard involved.
The equipment
If any adjustment,
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 equip -
ment , capacitors connected to high voltage points should be discharged; to discharge
mains filter capacitors, if fitted, short together the
L (live) and N (neutral) pins of
the mains plug.
Mains plug
The mains plug shall only be inserted
in a socket outlet provided with a protective
earth contact.
lead without protective conductor.
or outside the equipment is likely to make the equipment dangerous.
The protective action shall not be negated by the use of an extension
Any interruption of the protective conductor inside
Fuses
Note that there is a supply fuse in both the
live and neutral wires of the supply
lead.
remain at supply potential.
If only one of these fuses should rupture, certain parts of the equipment could
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 6 A.
Make sure that only fuses with the required rated current and of the specified type
are used for replacement.
holders shall be avoided. The use of mended fuses and the short
- circuiting of fuse
July 83 (Am. 3)
Page (iii)

H 52017-900K
Vol. 1
CAUTIOfV : STAT'IC SENSITIVE COMPONENTS
Components identified with the symbol
parts lists are static sensitive devices.
also indicated
in the equipment by orange discs, flags or labels bearing the
same symbol.
components being permanently damaged by static charges or fast surges.
(I)
on the circuit diagrams andfor
The presence of such devices is
Certain handling precautions must be observed to prevent these
If a printed board containing static sensitive components (as indicated
by a warning disc or flag) is removed, it must be temporarily stored in
a conductive plastic bag.
(2) If a static sensitive component is to be removed or replaced the follow -
ing anti - static equipment must be used.
A work bench with an earthed conductive surface.
Metallic tools earthed either permanently or by repeated discharges.
A low - voltage earthed soldering iron.
An earthed wrist strap and a conductive earthed seat cover for the
ooerator. b7hOSe outer clothing must not be of man - made fibre.
- -
(3)
As a general precaution, avoid touching the leads of a static sensitive
component.
until it is required €or use.
When handling a new one, leave it in its conducting mount
This equipment is fcrmed from metal pressings and although every endeavour
has been made to remove sharp points and edges care should be taken, parti -
cularly when servi.sing the equipment, to avoid minor cuts.
VARNIi'JG : TOXIC: HAZARD
Many of the electr,,nic components used in this equipment employ resins and
other chemicals
which give off toxic fumes on incineration.
precautions should i herefore be taken in the disposal of these items.
Bcryllia (beryllium oxide) is used in the construction of the following
Appropriate
A -- - /, components in this squipment :
BERYLLIA
. . . . . . . . YP.i.t. .M?. f . T.r.wi 8 f9T.S. .?W. ?PP. .%?6.. . . . . . . .... . .
This material, when in the form of fine dust or vapour and inhaled into the
lungs, can cause
a respiratory disease.
it can be handled quite safely although it is prudent to avoid handling con -
ditions which promote dust formation by surface abrasion.
Because
of this hazard you are advised to be very careful in removing and
disposing of these components.
or domestic waste
or despatch them by post. Tliey must be separately and
securely packed and clearly identified
to show the nature of the hazard and
then disposed of
in a safe manner by an authorized toxic waste contractor.
In its solid form, as used here,
Do not put them ir! the general industrial
WARNING : AC QOLTAGES
A
Disconnect mains lead before removing thc cover of Unit AP1 for either
access or adjustment, for details see Control circuit power supply
(API)
Chap. 4 - 2 Technical description.
d
4
4
Page (iv)
Dec. 80

H 52017-900K
Vol. 1
Chapter 1
GENERAL I NFORMAT I ON
CONTENTS
Para.
1 Features
7 Tuning
9 output
10 Modulation
16 Performance data
16 Carrier frequency
17 Frequency sweep
18 RF output
19 Amplitude modulation
20 Frequency modulation
21 Internal modulation oscillator
22 Pulse modulation
23 Frequency counter
24 Internal reference standard
25 Spurious signals
26 Auxiliary facilities
27 Power requirements
28 Safety regulations
29 Radio frequency interference
30 Limit range of operation
31 Conditions of storage and transport
32 Dimensions and weight
33 Accessories
Fig. Page
I 1 10 kHz to 1024 MHz AM/FM Signal Generator 2017 ... ... ... 2
.. , 7
2 Sideband noise curves ... ... ... *.. ...
FEATURES
1. 2017 is a stable, low noise a.m./f.m. signal generator coverins the fre -
quency range 10 kHz to 1024 MHz.
of required settings via a keyboard with the alternative of using rotary con -
trols to adjust carrier frequency and output level.
ensures maximum flexibility and allows programming by the General Purpose
Interface Bus
(GP'IB)*. It is therefore equally suitable for use as a manually
operated bench mounted instrument or as part
of a fully automated test system.
Front panel operation
is by direct entry
Microprocessor control
I
*
GPIE - Marconi Instruments General Purpose Interface Bus in accordance
with IEEE Standard 488 - 1 978 and IEC Publication 625-1.
Sep, 82 (Am. 2)
Chap. 1
Page 1

H 5201 7-900K
Vol. 1
Fig. 1
IQ khk to 1024 MHz AM/FM Signat Generator 2017
2. Output levels from 0.2 pV to 4 V e.m.f. are available in the C.W. or f.m.
modes (up to 2 V e.m.f. in the a.m. mode) and the user is offered a choice of
five output level calibrations which are switch selectable on the froht panel.
3. Frequency stability in the locked mode is determined by a high quality
reference oscillator within the instrument and facilities are provided for
the use of an external reference when this is preferred.
4.
using either an internal modulation oscillator or an external source.
quality pulse modulation and slow sweep facilities are also provided.
Comprehensive amplitude and frequency modulation facilities are provided
High
5.
stored and recalled for later use.
Memory facilities allow up to ten complete instrument settings to be
6.
external signals in the range 10 Hz - 512 MHz.
The frequency counter display can also be used for the measurement of
Tuning
7. In the manual mode the frequency display gives an active indication of
the output frequency. Tuning takes place by means of the
RANGE selector
switch and the rotary
TUNE and FINE TUNE front panel controls. Depressing
the LOCK key reverts the system to a synchronizer whose setting
will be the
last measured frequency indicated
on the display.
8. Accuracy is within +2 parts in 107 over the temperature range of 0 to 40 C.
An external frequency standard of 1 MHz may be used where better stability is
required or to ensure consistency when a number of instruments are used in an
0
d
area.
Chap.
1
Page 2
Jan. 88 (Am. 5)

H 52017-900K
Vol. 1
1
output
9.
by rotary control if preferred.
RF levels can be set by means of the keyboard control or varied manually
Modulation
10.
giving a choice of two fixed frequencies, 400 Hz and 1 kHz, and a further
3 variable ranges from 20 Hz to 20 kHz which are controlled from the front
panel MODULATION OSCILLATOR controls.
Frequency and amplitude modulation are provided by the internal oscillator
PERFORMANCE DATA
Characteristic
Carrier frequency
c
c
16. Range
Se 1 ec t ion
Manual
:
Keyboard :
Indication
Resolution
Accuracy
Unlocked
:
Locked :
Performance
10 kHz - 1024 MHz in 9 ranges.
(1) 10 kHz to 4 MHz
(2) 4 MHz to 8 MHz
(3) 8 MHz to 16 MHz
(4) 16 MHz to 32 MHz
(5) 32 MHz to 64 MHz
(6) 64 MHz to 128 MHz
(7) 128 MHz to 256 MHz
(8) 256 MHz to 512 MHz
(9) 512 MHz to 1024 MHz
Frequencies may be selected manually using
the
11 turn main tuning control with
separate 3 turn fine tune control.
Keyboard provides for entry of up to
8 significant digits, decimal point and
frequency units.
A manually tuned
frequency may be locked by pressing the
LOCK key.
74 digit, LED seven segment display.
10 Hz up to 128 MHz.
100 Hz above 128 MHz.
Refer to frequency counter accuracy.
Relative to the reference frequency.
The output frequency will be within
+I x 10-7 +1 Hz of the indicated
frequency.
May
90 (Am. 6)
Chap. 1
Page 3

H 52017-900K
Vol. I
Stabili tv
Locked mode :
.-/
Refer to the accuracy spec if ication and
to the internal reference standard
specification. Less than
7 seconds is
required for the generator to regain
frequency lock after a frequency change
is made.
Frequency sweep
17. Sweep rate :
Horizontal ou tDu t :
RF outDut
18. Level
Se lec t i on
Manual
:
Keyboa.rd :
Indicaition :
Total level accuracy
(for levels, above
1 pV p.d. )
Ou tDu t impedance
RF leakage
Reverse power protection
Single shot sweep for use with
X-Y plotter.
Maximum sweep width one carrier frequency
range.
30 - 150 seconds for a full range
sweep adjustable by a front panel control.
1 - 9 V over one frequency range,
d
0.13 pV to 4 V e.m.f. ( - 131 to +I9 dBm)
c.w., f.m. and pulse mode.
0.13
pV to 2 V e.m.f. ( - 131 to +I3 dBm)
a .m.
Two concentric knob controls : switched
coarse attenuator with
6 dB steps and a
continuously variable fine attenuator
with
8 dB range.
Allows entry of up to
4 significant digits,
decimal point, sign and units.
34 digit, LED, seven segment display with
illuminated legend showing e.m.f., p.d.,
dBpV e.m.f., dBpV p.d. and dBm. Units
are selected by a front panel switch.
tl dB up to 512 MHz.
+2 dB up to 1024 MHz.
50 R; VSWR <I .15: 1 up to 256 MHz,
<1.25:1 up to 512 MHz,
<1.35:1 up to 1024 MHz at r.f.
output levels below 0.5 V e.m.f.
Less than 1 pV generated in a 50 R load by
a
2 turn 25 rmn loop, lOOmm or more from
the case of the generator.
Protects the generator output system against
accidental reverse power from a transmitter
of up
to 50 W capacity, 10 kHz - 1024 MHz
or applied d.c. of up to +40 V.
Chap. 1
Page 4
May 90 (Ani. 6)

H 52017-900K
Vol. 1
I Amplitude modulation
I
19. Carrier frequency range 10 kHz - 400 MHz, usable to 1024 MHz.
Modulation depth Up to 99% in 1% steps. 2 digits, LED
seven segment display.
keyboard or remote programming.
Entered via the
Accuracy
Better than +3% depth up to 80% depth.
mz modulation rate)
Envelope distortion Less than 2% t.h.d. up to
30% depth.
(using internal
1 kHz Less than 3.5% t.h.d. up to 80% depth.
External modulation
modulation oscillator)
Frequency range
:
(For carrier frequencies
10 kHz to 512 MHz):
(For carrier frequencies
512 MHz to 1024
MHz):
Frequency response:
(For carrier frequencies
10 kHz to 512 MHz)
(For carrier frequencies
512 MHz to 1024 MHz)
Input level :
Frequency modulation
20. Deviation
Accuracy
Distortion
External modulation
Frequency range
(For carrier frequencies
10 kHz to 512
MHz):
b
c
(For carrier frequencies
512 MHz to 1024
MHz):
Jan. 88 (Am. 5)
20 Hz to 125 kHz (d.c. coupled) at maximum
deviation and up to 260 kHz at half maximum
deviation.
20 Hz to 30 kHz (d.c. coupled).
- 10.5 dB from20 Hz to 125 kHz in levelledmode;
+O .3 dB from 20 Hz to 125 kHz inunlevelled mode.
k0.5 dB from20 Hz to 30 kHz inlevelledmode;
k0.3 dB from 20 Hz to 30 kHz inunlevelledmode.
0.5 V - 1.5 V r.m.s. into 600 fi to set
reference
level, indicated by an illumi -
nated legend in the levelled mode only.
1 V r,m.s. into 600 Q to set reference
level in unlevelled mode.
Entered via the keyboard or remote pro
-
gramming. 3 digits, LED, 7 segment display.
RF range Maxim deviation
40 kHz
40 kHz
80 kHz
160 kHz
320 kHz
640 kHz
1.28 MHz
2.56 MHz
200 kHz
- 14% of deviation selected +50 Hz.
Using the internal 1 kHz fixed modulation
oscillator, less
than 2% t.h.d. at maxi -
mum deviation on each r.f. range.
20
Hz to 125 kHz (d.c. coupled) at maximum
deviation and up to
260 kHz at half maximum
deviation.
20
Hz CO 30 kHz (d.c. coupled).
4
Chap. 1
Page 5

H 52017-900K
Vol. 1
b Frequency response :
Input level :
Internal modulation oscillator
21. Frequency
Accuracy
Pulse modulation
20.5
dB over specified frequency range in
levelled mode.
20.3 dB over specified frequency range in
d’
unlevelled mode. 4
0.5 V - 1.5 V r,m.s. into 600 Q to set
reference level, indicated by an
illumi -
nated legend in the levelled mode only.
1 V r.m.s. into 600 Q to set reference
level in unlevelled mode.
20
Hz to 20 kHz, continuously variable in
3 decade ranges. Also 2 fixed frequen -
cies, switch selected, of 400 Hz and 1 kHz.
+5% for fixed frequencies.
22. Carrier frequency range
4 MHz to 1024 MHz.
Pulse/carrier rise time Less than 25 ns for carriers above 25 MHz-
Pulse duration
-
100 ns to infinity.
Carrier suppression Better than 70
dB up to 80 MHz,
46 dB up to 512 MHz.
Additional carrier level error k2 dB.
Input characteristic Positive
- going modulation up to +I V input.
Saturation level +1.1
V. Maximum input
+5 V. Input impedance 50 R. Effective
bandwidth d.c. to 15
MHz reduced below
25
MHz carrier.
Frequency counter (external mode)
23. Frequency range 10 Hz to 520 MHz.
-
Re so 1 ut ion
Sen s it ivi ty
1 Hz from 10 Hz to 10 MHz,
10 Hz from 1 MHz to 100 MHz,
100 Hz from 10 MHz to 520 MHz.
100 mV p.d. into
50 Q, 1 MHz to 520 MHz.
200 mV p.d. into
1 MQ, 10 Hz to 10 MHz.
Ac curac Y 21 digit + reference standard error.
Chap.
1
Page 6
Jan. 88 (Am, 5)

H 52017-900K
Vol. I
c
Internal reference standard
24. Temperature stability
Warm up time
Spurious signals
25. Carrier harmonics
(c.w., a.m. and f.m.)
Carrier aub-harmonics
Non - harmonic components
FM on C.W.
( CC ITT telephone psopho-
metric weigh t ins)
AM on C.W.
( - 3 dB bandwidth
20 Hz to 20 kHz)
Single sideband phase noise
(at,
20 kHz offset)
7
Better than +2 in 10 over the operatiag
temperature range 0 to 4OoC.
Within 0.5 p.p.m. of final frequency
within
5 min. from switch on at ambient
20%.
Better than - 27 dBc.
than - 40 dBc. Typically better
For carrier frequencies up to
512 MHz no
carrier sub
- harmonics are generated.
- 60 dBc above 512 MHz.
For carrier frequencies between 4 MHz and
1024 MHz no,non-harmonically related sig -
nals are generated. - 50 dBc below 4 MHz.
Less than 3 Hz equivalent deviation up to
512 MHz and 6 Hz up to 1024 MHz. Reduces
by approximately 6 dB per octave as the
carrier frequency is reduced (down to
4 MHz).
Less than - 70 dBc. Equivalent to less
than
0.06% modulation depth.
Better than
- 135 dBc/Hz at 20 kHz offset
from carrier at
470 MHz. For typical
performance at other offsets and carrier
frequencies see Fig.
2, Sideband noise
curves.
-loo
hsidebaid noise of 2017 at var~ous- I
Fig. 2 Sideband noise curves
F
Jan. 85 (Am. 4)
Chap. 1
Page 7

H 52017-900K
Vol. 1
Auxiliary facilities
26. Remote operation -
Subsets :
All major front panel functions may be
remotely controlled
via the GPIB
(see
Chap. 1, p. I*>.
Complies with the following subsets as
defined in IEEE 488 - 1978 : SHl,AHl,T5,
TEO,L4,LEO,SRl,RL1,PPO,DCl,DTO,CO,El.
outputs
Modulation oscillator
:
Front panel socket providing approximately
I V r.m.s. into 600 52.
Frequency standard :
Rear panel socket may be used as internal
standard output or external standard input
as selected by adjacent switch.
t . t. 1. compatible.
1 MHz,
Inputs
External frequency
standard
:
Power re a ui r emen t: s
27.
AC supply voltage
Frequency
Consumption
Safety regulations
-
28.
Radio frequency i-nterference
29.
Limit range of operation
30. Temperature
Switch selected input accepting
at least
4 V p-p at 1 MHz. Input impedance
approximately
1 kS1.
105 V to 120 V +10% or 210 V to 240 V &10%.
45 to 65 Hz.
140 VA maximum.
d
d
This instrument complies with Publication
IEC 348.
This instrument conforms with the require -
ments of EEC Directive 76/889 as to limits
of r.f. interference.
0 to 55OC.
Chap. 1
Page 8
Jan. 88 (Am. 5)

H 52017-900K
Vol. 1
Conditions of storage and transport
31. Temperature -4OOC to +7OoC.
c
Humidity Up to 90% relative humidity.
A1 ti tude Up to 2500
m (pressurized freight at
27 kPa differential
i.e. 3.9 lbf/in2).
Dimensions and weight (approximately)
32. Height
: 195 mm (7.7 in) 178 m (7 in).
With handles
& feet Without handles 8 feet
Width : 453 mm (17.8 in) 419 mm (16.5 in).
Depth : 543 m (21.4 in) 491 mm (19.3 in).
Weight
: 29 kg (63 lb).
c ACCESSORIES
1
33. Supplied accessories
AC supply lead
Operating manual
H 52017-900K (Vol. 1)
Optional accessories
When ordering, address the order to our Service Division
and specify the type and serial number
of the instrument
as given on the label on the rear panel.
been superseded by a model number label, quote the model
number instead.
If this has
Service manual
H 52017-900K (Vol. 2)
Itack mounting kit
Maintenance kit
Comprising
:
Extender cable 14 way (Ribbon cable)
Extender cable
16 way (Ribbon cable)
Extender lead (AS4) Edge-connector type
Extender lead (AS3)
Extender lead (AS5)
RF connector assy.
1
(Maintains logic box r .f.
connection when in servicing position)
GPIB lead assy.
Marconi Instruments GPIB manual
H 54811-010P
F@ connecting cable TM 4969/3; 50 Q, 1.5 m (5 ft) BNC
GPIB IEEE/IEC connector adapter
Code no.
43123-076Y
46881-388D
46881-389T
46883-4823
547 1 I-032H
43129-591M
43329-592C
43129-618W
43129-619D
43129-620s
43129-625X
43129-18911
46881-365R
4 3126-012s
46 88 3- 40 8K
F
Jan. 88 (Am. 5)
Chap. 1
Page 9/10

H 52017-900K
Vol. 1
c
I
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Chapter 2
INSTALLATION
CONTENTS
Para.
1 Unpacking and repacking
3 Mounting arrangements
4 Connecting to supply
6 Safety testing
7 Rack mounting
Fig. Page
... ... 3
... ... 4
... 4
1 Logic processor unit front securing screws ...
2 Removal of air duct .. ... ... ...
3
Alternative fixing positions for logic processor unit
UNPACKING AND REPACKING
1.
(if included) in case
it is necessary to reship the instrument.
Retain the container, packing material and the packing instruction note
2.
cating the service required, type or model number (on rear label), serial
number and your return address, Pack the instrument in accordance with the
general instructions below or with the more detailed information in the pack
-
ing instruction note.
If the instrument is to be returned for servicing attach a label indi -
(1)
(2)
plywood load spreader(s) facing inwards.
(3)
container with the front handles and rear projections (where applicable)
against the plywood load spreaders.
(4) Place pads in the two sides of the container with cushioning facing
inwards.
(5) Place the top pad in position.
(6) Wrap the container in waterproof paper and secure with adhesive
tape.
(7)
Mark the package FRAGILE to encourage careful handling.
Place a pad in the bottom of the container.
Place pads in the front and rear ends of the container with the
Put the polythene cover over the instrument and place
it in the
Note.. .
If the original container or materials are not available, use a
strong double
- wall carton packed with a 7 to 10 cm layer of shock
absorbing material around all sides of the instrument to hold
it
firmly.
board load spreader;
if the rear panel has guard plates or other
projections a rear load spreader is also advisable.
Protect the front panel controls with a plywood or card
-
July 81 (Am. 1)
Chap. 2
Page 1

H 52G17-900K
Vol. 1
MOUNTING ARRANGEMENTS
7. Excessive temperatures may affect the instrument's performance; there -
fore, completely remove the plastic cover, if one is supplied over the case,
and avoid standing the instrument on or close to other equipment that is hot.
CONNECT1NG TO SUPPLY
4. Before connecting the instrument to the a.c. supply check the position of
the voltage selector on the rear panel.
with the selector set to
230 V. For supplies in the range 95 to 130 V remove
upper instrument cover, remove the handle
trim strips as indicated in para. 7(b)
then raise the logic processor as described in para. 7 (5), (6) and (7). Re -
move API
transparent perspex covering plate. This is affixed by two nylon
screws.
into the rear panel Eixing and marked 230 V. Secure the socket not in use
marked
115 V into the rear panel fixing so that selected range is indicated
in the window. Refit API cover plate, logic processor, connectors and finally
outside cover and
trim strips.
The instrument is normally despatched
Change the edge connector socket
SKAK with the alternative clipped
5. The free a.c. supply cable is fitted at one end with a female plug which
inatt;.s with the a.c. ,connector at the rear of the instrument. When fitting a
supply plug ensure that conductors are connected as follows.
Earth
- Green/Yellow
Neutral - Blue
Live - Brown
When attaching the mains lead to a non
- soldered plug it is recommended that
the tinned ends of
the lead are first cut off owing to the danger of cold flow
resulting in intermittent connections.
SAFETY TEST1 NG
6. Where safety tests on the mains input circuit are required, the following
procedures can be applied. These comply with
BS 4743 and IEC Publication 348.
Tests are to be carried out as follows and in the order given, under ambient
conditions, to ensure that mains input circuit components and wiring (includ
-
ing earthing) are safe.
(I) Earth lead continuity test from any part of the metal frame to the
bared end
of the flexible lead for the earth pin of the user's mains
plug. Preferably
a heavy current (about 25 A) should be applied for
not more than 5 seconds.
Test
limit : not greater than 0.5 R.
(2) 500 V d.c. insulation test from the mains circuit to earth.
Test
limit : not less than 2 MR.
RACK MOUNTING
7. A rack mounting kit is supplied if required as an optional accessory.
Mien rack mounted, extra support is required at the rear of the instrument,
fi.t ting instructions are as follows:-
4
Chap. 2
P2ge 2
July 83 (Am. 3)

H 52017-900K
Vol. I
(1) Remove instrument outer covers.
easily removed by withdrawing two fastening screws for each cover, these
are secured to the rear panel.
(2) Detach and discard the front and rear feet on the bottom cover.
(3)
each of these are held by two countersunk screws, see Fig. 1 below.
Both top and bottom covers are
Remove the
trim strips from the side of both front carrying handles,
c
I
L
Trim
Trim securing screw
TPB LLLP
Fig. 1 Logic processor unit front securing screws
(4)
follows : -
Temporarily remove the right - hand, - side handle and side rail as
(a) Remove (stone coloured) end cap cover by sliding up (or down)
from its mating end cap plate.
(b)
moulding.
Prise off handle end cap by inserting blade at outer end of
(c) Remove handle held by a single screw at each end.
(d)
f ixings .
Slide out the infill trim strip to uncover the side rail
(e) Remove the side rail secured by three screws.
(5)
right - hand front carrying handle, see Fig. 1, and similarly the cor -
responding screws on the left - hand side carrying handle.
Remove the two front logic processor securing screws from the
c
Jan. 88 (Am. 5)
Chap. 2
Page 3

H 52027-900K
Vol. 1
(6)
shown in Fig. 2 below,
Detach the air duct from the rear of the logic processor unit
nnnnnnnnnnnn
1
-1
I
n
Detach hose from Logic
d
processor before Pivoting
Logic processor unit.
1PB1450
Fig. 2 Removal of air duet
(7)
Before any attempt is made to pivot the logic processor unit it is
essential that the four conhex plugs PLAU, PLAV, PLAW and PLDE are first
disconnected.
has been incorporated. A slide key plate is fitted in such a position
that its tab protrudes through a keyhole in the side frame. This pre
-
vents the raising of the unit inadvertently.
have been disconnected the slide key plate can be moved sideways to
release the tab from the side frame. The logic processor unit should
then
be pivoted into one of three positions and fixed using one of the
two front securing screws as shown in Fig. 3 below.
To ensure that this is not neglected a safety feature
When the conhex plugs
Locating Hole
Alternative retoining positions
for elevation
of logic
processor
unit
Locating Screw
Fig. 3
Alternative fixing positions for logic processor unit
d
Chap. 2
Page 4
July 81 (Am. 1)

H 52017-9OOK
Vol. 1
(8) Remove the hexagon securing nut from the 'RF OUTPUT' connector and
push the
50 Q connector (socket SKDJ) back out from the front panel
mounting. Re
- route the co-axial connector to pass through the notch in
the forward outer corner of the GPIB board AGI and install the socket
SKDJ into the alternative rear panel position, transferring the blind
gromnet from the rear to the front panel hole.
(9) Restore the logic processor unit to its stowage position, reconnect -
ing the conhex plugs and slide plate.
handle. Refit the side
rail and side
(10) Fit rack brackets into the front handle trim recesses using the
M4 x 16 mm long screws,
(11) Replace top and bottom covers and
fit unit into the rack;
at the rear should also be given e.g. a shelf located within the rack or
cubicle.
support
c
Jan. 88 (Am. 5)
Chap. 2
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