Marconi Instruments 2040 User manual

Operating Manual
SIGNAL GENERATORS
2040 series
2040 10 kHz to 1.35 GHz
2041 10 kHz to 2.7 GHz
2042 10 kHz to 5.4 GHz
Includes information on:
Option 001 -Second modulation oscillator
Option 002 -Pulse modulation
Option 003 -High output power
Option 006 -Avionics
Option 008 -RF profiles and complex sweep
Option 100 -Single fuse version
Option 105 -Modified pulse modulation
This manual applies to instruments with software issues of 5.003 and higher.
©Marconi Instruments Ltd. 1993
No part of this book may be reproduced or transmitted in
any fortn or by any means, electronic or mechanical,
including photocopying, or recorded by any information
storage or retrieval system, without permission in writing
by Marconi Instruments Ltd.

Ill
Preface
Operating precautions
Chapter 1GENERAL INFORMATION
Chapter 2INSTALLATION
Chapter 3-1 OPERATION
Chapter3-2 GPIB OPERATION
Chapter 4-1 BRIEF TECHNICAL DESCRIPTION
Chapter 5-1 'ACCEPTANCE TESTING.....
.54-A ^tCEPTANCE TESTING SECOND MODULATION
OSCILLATOR OPTION
.5-1-B ACCEPTANCE TESTING PULSE MODULATION
OPTION
.5-1-C ACCEPTANCE TESTING HIGH OUTPUT POWER
Annex BOPTION 008 RF PROFILE AND COMPLEX SWEEP
Index
iv
1-1
2-1
3-1-1
3-
2-2
4-
1-1
5-
1-1
5-1-A-l
5-1-B-l
5-1-C-l
Annex A-l
Annex B-l
Index 1

WARNINGS, CAUTIONS and NOTES
These terms have specific meanings in this manual
WARNINGS contain information to prevent personal injury.
CAUTIONS contain information to prevent damage to the equipment.
Notes contain important general information.
HAZARD SYMBOLS
The meaning of hazard symbols appearing on the equipment is as follows:
ratq&sri J
Symbol
A
A
A
A
Nature of hazard
Dangerous voltage
Reference in manual „
Al. A-i-n
Beryllium
Fire hazard
Lithium batteries are used in this
Appropriate caution should be exercised
when handling these items.
SAFETY
This product has been designed and tested in accordance with BS4743 ’Specification for
safety requirements for electronic measuring apparatus' and 1EC Publication 348 'Safety
requirements for electronic measuring apparatus'.

WARNING -ELECTRICAL HAZARDS
AC supply voltage. This equipment conforms with IEC Safety Class 1, meaning that it
is provided with aprotective grounding lead. To maintain this protection the supply lead must
always be connected to the source of supply via asocket with a grounded contact.
Be aware that the supply filter contains capacitors that may remain charged after the
equipment is disconnected from the supply. Although the stored energy is within the approved
safety requirements, aslight shock may be felt if the plug pins are touched immediately after
removal.
Removal of covers. Disconnect the supply before removing the covers so as to avoid the
risk of exposing high voltage parts. If any internal adjustment or servicing has to be carried out
with the supply on, it must only be performed by askilled person who is aware of the hazard
involved.
Fuses. Note that there are supply fuses in both the live 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.
For Option 1G0?single fuse version only:
Fuses. Note that the internal supply fuse is in series with the live (brown) conductor of
the supply lead. If connection is made to a2-pin unpolarized supply socket, it is possible for the
fuse to become transposed to the neutral conductor, in which case, parts of the equipment could
remain at supply potential even after the fuse has ruptured.
HAZARD
Make sure that only fuses of the correct rating and type are used for replacement.
If an integrally fused plug is used on the supply lead, ensure that the fuse rating is
commensurate with the with current requirements of this equipment. See under 'Performance
Data' in Chapter 1for power requirements.
CAUTION -PULSE INPUT
Before switching the instrument on, ensure that no signal voltage is present on the
PULSE INPUT socket.

WARNING -OTHER HAZARDS
Some of the components used in this equipment may include resins and other materials
which give off toxic fumes if incinerated. Take appropriate precautions, therefore, in the
disposal of these items.
Beryllia (beryllium oxide) is used in the construction of some of the components in this
equipment.
This material, if incorrectly handled, could cause adanger to health -refer to the
Maintenance part of the Service Manual for safe handling precautions.
ALithium battery is used in this equipment.
Lithium is atoxic substance. Therefore these items should in no circumstances be
crushed, incinerated or disposed of in normal waste.
CAUTION -STATIC SENSITIVE COMPONENTS
This equipment contains static sensitive components which may be damaged by handlin:
-refer to the service manual for handling precautions.
CAUTION -TILT FACILITY
When the instrument is in the tilt position, it is inadvisable for stability reasons, to stack
other instruments on top of it.
46882-074C

Blank Page
46882-074C

GENERAL INFORMATION
CONTENTS PAGE
INTRODUCTION 1-2
MAIN FEATURES 1-2
Operation 1-2
Display 1-2
Frequency selection 1-2
Output 1-2
Modulation 1-3
Incrementing 1-3
Sweep 1-3
Non-volatile memory 1-3
Programming 1-4
Protection 1-4
Spectral purity 1-4
Calibration 1-4
Options 1-4
PERFORMANCE DATA 1-5
LIST OF FIGURES
Fig. 1-1 Typical phase noise performance of 2040 series 1-5
46882-074C 1-1

INTRODUCTION
The 2040 series of Signal Generators cover the frequency range 10 kHz to 5.4 GHz with
three models: 2040 (10 kHz to 1.35 GHz), 2041 (10 kHz to 2.7 GHz) and 2042
(10 kHz to 5.4 GHz). Adot matrix display with soft key selected screen options allow flexibility
of operation and ease of use. The output may be amplitude, phase, or frequency modulated with
pulse modulation available as an option. Modulation is available using acombination of up to
two external signal inputs and abuilt-in LF source (a second internal source is optional).
Microprocessor control ensures that the instruments are flexible and easy to use and
allows programming by the General Purpose Interface Bus (GPIB). The GPIB is designed to
IEEE Standard 488.2 and is ameans of sending commands to an instrument, via adata bus, from
aremote controller or personal computer. The instruments can therefore be used manually or as
part of afully automated test system.
MAIN FEATURES
Operation
Selection of parameters on the screen may involve one or more of the numeric, hard or
soft keys or the rotary knob. Hard keys have single or dual functions which remain constant
throughout, whereas soft keys have functions dependent on the present mode of operation.
Parameters may be set to specific values by numeric key entry, while values may be varied in
steps of any size using the n/JJ- keys or altered by moving the knob, set to aparticular sensitivity.
The SIG GEN, LF, SWEEP, MEM (memory), A(delta) and UTIL (utility) menus are
selectable, at any point of operation, via the keys below the display panel. Within the display, the
soft key functions are indicated by labels which appear alongside the keys situated at either side
of the display panel.
Display
The display is adot matrix liquid crystal panel, with backlighting. Carrier frequency,
modulation and RF level are shown in horizontal regions on the principal screen. The display
features 11 -digit resolution for carrier frequency, 4-digit for RF level and 3-digit for modulation,
with unit annunciators.
Contrast may be varied, using the control knob, to optimize the viewing angle. Differing
lighting conditions may be accommodated using the backlight intensity function, variable from
no backlight to full intensity. Afull graphical display test is available, refer to the Service
Manual.
Frequency selection
Carrier frequency is selected via the soft key option on the SIG GEN display and direct
entry via the keyboard. Alternatively, selection may be made via the General Purpose Interface
Bus (GPIB). Frequency resolution is 0.1 Hz across the band. Carrier frequencies can be stored in
anon-volatile memory with complete recall when required. An ON-OFF key is provided to
completely disable the output.
Output
RF output up to +13 dBm can be set by direct keyboard entry with aresolution of 0.1 dB
or better over the entire range. Ahigh output option is available to extend the maximum
calibrated level to +19 dBm on the 2040 instrument.
1-2 46882-074C

An extended hysteresis facility allows for extended electronic control of RF output level
without introducing mechanical attenuator transients when testing squelch systems.
Alow intermodulation mode can be selected which disables the RF levelling system and
improves the intermodulation performance when combining the outputs of two signal generators.
Achoice of calibration units is available to the operator and provision is made for the
simple conversion of units (for example, dBm to jiV). Calibration data for the output level is
held in memory and may be altered from the front panel or over the interface bus.
The output level can be offset by up to ±2 dB by keyboard entry. Offsets from the
calibrated value may be used to compensate for cable or switching losses external to the
generator. This facility can be used as ameans of deliberately offsetting the output level to
ensure that all generators in an area give identical measurements. While using the offsetting
facility, the principal calibration of the generator is not lost and may be returned to at any time.
An electronic trip protects the generator output against reverse power of up to 50 W,
preventing damage to output circuits when RF or DC power is accidently applied.
Modulation
Comprehensive amplitude, frequency (plus wide bandwidth FM), phase and optional
pulse modulation are provided for testing awide range of receivers. An internal modulation
oscillator is provided, having afrequency range of 0. 1Hz to 500 kHz, with aresolution of
0.1 Hz. Asecond modulation oscillator can be included as an option. Two independent BNC
inputs on the front panel allow external modulation signals to be mixed with the internal
signal(s). Therefore, amaximum of four modulation sources may be available at one time. These
sources may be combined to give the single, dual, composite and dual composite modes, see
'MODULATION MODES’, Chap. 3-1
.
The signalling facility allows testing of radio equipment with sequential and sub-audible
tone capability. The sequential calling tone system is accessible from the utility menu for all four
modulation modes. Sub-audible calling tones are specified within the modulation source select
display.
Incrementing
All major parameters can be incremented or decremented in step sizes entered via
keyboard entry or the GPIB. If no step size is entered for aparameter, the steps are preset to
1kHz for earner frequency, 1kHz for modulation oscillator and LF frequency, 1kHz for FM
deviation, 1%for AM depth and 1dB for output level.
In addition the rotary control can be used to vary the parameter with the sensitivity of the
knob being changed by means of the xlO and -*-10 keys.
Sweep
The sweep capability of the 2040 series allows comprehensive testing of systems. Four
parameters are used to specify sweep; start, stop, number of steps and time per step. These are
specified by the user, with upper and lower limits for the parameter values being dependent on
the function. The sweep markers menu is available by soft key selection on the sweep display,
allowing the placement of up to five user defined markers.
Non-volatile memory
The non-volatile memory allows 50 complete instrument settings, 50 partial settings, 100
carrier frequency settings, 20 sweep settings and 20 signalling tone sequences to be stored for
later use at any time.
46882-074C 1-3

Programming
AGPIB interface is fitted so that all functions are controllable via the interface bus which
is designed to the IEEE Standard 488.2. The instrument can function both as atalker and a
listener.
Protection
To prevent accidental interference with the contents of internal memories, internal data is
protected by asecure key sequence.
Two levels of protection are offered, appropriate to the function being accessed. The
most secure is reserved for features which alter the calibration data of the instrument. The first
level of protection is less severe, enabling the user to access functions which are relevant to
normal operation, such as selecting the RF level calibration units, RF level offsets and external
standard frequency.
Spectral purity
With an SSB phase noise performance of better than -140dBc/Hz at 1GHz (20 kHz
offset), the 2040 series can be used for both in-channel and adjacent channel receiver
measurements. Harmonically related signals and non-harmonics are better than -30dBc and
-90 dBc respectively.
Calibration
The 2040 series has atwo year calibration interval and is calibrated entirely by
electronically controlled adjustment. TTiere are no internal mechanically adjustable components
to affect the calibration. The calibration display is available via soft key selection at the utilities
menu.
Options
The following factory-fitted options are available:
Option 001 -Second modulation oscillator
An additional modulation oscillator is available to enable greater flexibility. This second
oscillator has the same specification as the first and allows full use of complex modulation
modes.
Option 002 -Pulse modulation
The pulse modulation facility allows radar RF and IF stages to be tested and features rise
and fall times of less than 15 ns with an on/off ration of better than 70 dB.
Option 003 -High output power
This option extends the output level to +19 dBm on the 2040 model.
Option 006 -Avionics
Provides internally generated modulation waveforms suitable for the testing of
Instrument Landing systems (ILS) and VHF Omni Range (VOR) beacons.
1-4 46882-074C

Option 008 -RF profiles and complex sweep
The RF profile facility provides compensation for frequency dependent level errors
introduced by cables, amplifiers and signal combiners. The complex sweep facility generates
sweeps whose step size, step time and RF level change while the sweep is in progress. These
features are particularly useful for EMC, Tempest and ATE applications.
Option 100 -Single fuse
Asingle fuse is used in place of the standard double fuse.
Option 105 -Modified pulse modulation
Modifies the pulse modulator (Option 002) to provide aslower rise and fall time for
testing time domain duplex and time domain multiple access receivers.
SSB Phase
Noise (dBc/Hz)
Carrier Frequency (MHz)
SSB Phase
Noise (dBc/Hz)
-90
-100
-110
-120
-130
-140
-150
-160 0.1 OJJ 1310 30 100 300 1000 3000 10000
Offset (kHz)
Fig. 1-1 Typical phase noise performance of2040 series
PERFORMANCE DATA
Carrier frequency
Range
Selection
10 kHz to 1.35 GHz (2040);
10 kHz to 2.7 GHz (2041);
10 kHz to 5.4 GHz (2042).
By keyboard entry of data. Variation by llV-lj- keys and by rotary
control.
Indication 1 1 digits with annunciators.
Resolution 0. 1Hz.
Accuracy As frequency standard.
Phase incrementing The carrier phase can be advanced or retarded in steps of 7t/128
radians (approximately 1.4°) using the rotary control.
46882-074C 1-5

RF OUTPUT
Range
Selection
Indication
Resolution
Overrange*
Extended electronic level
setting range*
*When mode is enabled.
Accuracy
-144 dBm to +13 dBm (2040, 2041);
-144 dBm to +19 dBm (2040 with Option 003);
-144 dBm to +13 dBm (2042), derated over 4GHz by 0.1 dB/°C
above 40°C.
When AM is selected the maximum output level reduces linearly
with AM depth to +7 dBm (+13 dBm for 2040 with Option 003)
at maximum AM depth.
Selectable overrange mode allows uncalibrated output levels to
+19 dBm to be generated.
Selectable extended hysterisis provides for uncalibrated level
control over an 24 dB range without the mechanical attenuator
operating.
By keyboard entry of data. Variation by 1I7-11 keys and by rotary
control. Units may be pV, mV, VEMF or PD; dB relative to
1ji V, 1mV EMF or PD; dBm. Conversion between dB and
voltage units may be achieved by pressing the appropriate units
key (dB, or V, mV, pV).
4digits with unit annunciators.
0.1 dB.
Adjustable up to typically +19 dBm (typically +25 dBm for 2040
with Option 003).
Non-interrupting level control range of 18 dB.
At 23 ±5 °C ambient:
Output level
Carrier frequency range
10 kHz
to
1.35 GHz
1.35 GHz
to
2.7 GHz
2.7 GHz
to
5.4 GHz
>-127 dBm ±0.85 dB ±1.0 dB -
>-100 dBm ±0.85 dB ±1.0 dB ±1.5 dB
>-50 dBm ±0.85 dB ±1.0 dB ±1.5 dB
>=0 dBm ±0.50 dB ±0.7 dB ±1.0 dB
Temperature
coefficient
(dB/°c)
±0.005 ±0.01 ±0.02
2040 with Option 003: ±1.2 dB for output levels greater than
-127 dBm.
1-6 46882-074C

VSWR For output levels less than 0dBm:
Less than 1.25:1 to 2.2 GHz (return loss greater than 19.1 dB);
Less than 1.4:1 to 2.7 GHz. (return loss greater than 15.6 dB);
Less than 1.5:1 to 5.4 GHz (return loss greater than 14 dB).
Output protection An electronic trip protects the generator output against reverse
power of up to 50 Wfrom asource VSWR of up to 5:1.
Output connector 50 Qnormal, N-type female socket.
SPECTRAL PURITY
At RF levels up to +7 dBm
Hannonics 2040, 2041:
Better than -30 dBc for carrier frequencies to 1GHz;
Better than -27 dBc for carrier frequencies to 2.7 GHz.
Better than -27 dBc for carrier frequencies to 1.35 GHz;
(2040 with Option 003).
2042:
Better than -25 dBc for carrier frequencies to 5.4 GHz.
Sub-harmonics Better than -90 dBc to 1.35 GHz,
Better than -40 dBc to 2.3 GHz,
Better than -30 dBc to 5.4 GHz.
Non-harmonics
(offsets greater than
3kHz)
In low noise mode 1: Better than -70 dBc up to 21 .09375 MHz;
better than -90 dBc from 21 .09375 MHz !
to 2.7 GHz;
and better than -84 dBc from 2.7 to
5.4 GHz.
In normal mode: Better than -70 dBc to 5.4 GHz.
Residual FM (FM off) Low noise mode: Less than 0.3 Hz RMS deviation in a300 Hz to
3.4 kHz unweighted bandwidth at 1GHz.
Normal mode: Less than 7Hz RMS deviation in a300 Hz to
3.4 kHz unweighted bandwidth at 470 MHz.
SSB phase noise Low noise mode 1: Less than -115 dBc/Hz at an offset of 1kHz
from aearner frequency of 1GHz;
Less than -140 dBc/Hz at an offset of 20 kHz from acarrier
frequency of 1GHz.
Normal mode: Less than -116 dBc/Hz (typically -122 dBc/Hz) at
an offset of 20 kHz from acarrier frequency of 470 MHz.
RF leakage Less than 0.5 jiV PD generated at the carrier frequency across a
50 Hload by atwo turn 25 mm loop, 25 mm or more from the
case of the generator with the output terminated in a50 Q. sealed
load.
FM on AM Typically less than 100 Hz for 30% AM depth at amodulation
frequency of 1kHz and acarrier frequency of 500 MHz.
OM on AM Typically less than 0.1 radians at acarrier frequency of 500 MHz
for 30% AM depth for modulation rates up to 10 kHz.
46882-074C 1-7

MODULATION MODES Four modulation modes are available:
Single FM, Wideband FM, OM, AM or pulse (optional).
Dual Two independent channels of differing modulation type (e.g. AM
with FM).
Composite Two independent channels of the same modulation type. (e.g.
FM1 with FM2).
Dual composite Acombination of Dual and Composite modes providing four
independent channels
(e.g. AMI with AM2 and FM1 with FM2).
Phase modulation can be used instead of FM (but not
simultaneously).
FREQUENCY MODULATION
Deviation Peak deviation from 0to 1MHz for carrier frequencies up
to 21 .09375 MHz;
Peak deviation from 0to 1% of carrier frequency above
21.09375 MHz.
Deviation for 2040 series in low noise mode is limited to:
Carrier frequency range Deviation limit
2.7 GHz ~5.4 GHz 200.0 kHz
1.35 GHz -2.7 GHz 100.0 kHz
675 MHz -1.35 MHz 50.0 kHz
337.5 MHz -675 MHz 25.0 kHz
168.75 MHz -337.5 MHz 12.5 kHz
84.375 MHz -168.75 MHz 6.25 kHz
42.1875 MHz -84.375 MHz 3.125 kHz
21 .09375 MHz -42.1875 MHz 1.0625 kHz
below 21.09375 MHz 6.25 kHz
Selection By keyboard entry of data. Variation by 1F/4J- keys and by rotary
control.
Indication
Displayed resolution
Accuracy at 1kHz
internal modulation
3digits with annunciators.
1Hz or 1least significant digit, whichever is greater.
In low noise modes: ±6% of indication ±1 Hz excluding residual
FM.
In normal noise modes: ±5% of indication ±10 Hz excluding
residual FM.
46882-074C

Accuracy at 1kHz
external modulation
1dB bandwidth
3dB bandwidth
Carrier frequency offset
Distortion
Modulation source
Group delay
WIDEBAND FM
Deviation
Indication
Selection
Input level
Accuracy
3dB bandwidth
Modulation source
Group Delay
In normal mode: ±5% of indication ±10 Hz excluding residual
FM.
With ALC off, the modulation is calibrated for an input level of
1.0 VPD RMS sine wave.
In low noise mode: ±6% of indication ±1 Hz excluding residual
FM.
DC to 300 kHz (DC coupled).
10 Hz to 300 kHz (AC coupled).
Typically 500 kHz.
Bandwidth is limited to 100 kHz in low noise mode.
Typically greater than 1MHz.
Capable of accepting external sources of FSK signals.
In DC FM mode less than ±(1 Hz +0.1% of set deviation) after
using DC FM nulling facility.
Using external modulation without ALC:
Less than 3% at maximum deviation for modulation frequencies
up to 20 kHz.
Less than 0.3% at 10% of maximum deviation for modulation
frequencies up to 20 kHz.
Internal LF generator or external via front panel sockets.
Less than ljis, 3kHz to 500 kHz.
In low noise mode less than 3{is, 3kHz to 250 kHz.
Arear panel input on aBNC connector allows an external
modulation signal to produce up to the maximum deviation. The
deviation is controlled in 3dB steps only and the generator will
display the deviation equivalent to 1V RMS sine wave input.
3digits with annunciators.
By keyboard entry of data. The sensitivity is controlled in 3dB
steps and the display will indicate the value of deviation nearest
to the requested value.
1VRMS sine wave to achieve indicated deviation.
As FM.
In normal noise mode typically 10 MHz (DC or AC coupled).
In low noise modes typically 250 kHz (DC or AC coupled).
External via rear panel socket (50 Qimpedance).
Less than 0.5 {is, 3kHz to 10 MHz.
46882-074C 1-9

PHASE MODULATION
(Normal mode only) r7[
Deviation 0to 10 radians in 0.01 radian steps.
Selection By keyboard entry of data. Variation by IF/11 keys and by rotary
control.
Indication 3digits with annunciators.
Resolution 0.01 radians.
Accuracy at 1kHz Better than ±5% of indicated deviation excluding residual phase
modulation.
3dB bandwidth 100 Hz to 10 kHz.
Distortion Less than 3% at maximum deviation at 1kHz modulation rate.
Modulation source Internal LF generator or external via front panel sockets.
AMPLITUDE MODULATION
For carrier frequencies up to
1GHz (and for output levels
less than +13 dBm with
Option 003):
Range 0to 99.9% in 0.1% steps.
Selection By keyboard entry of data. Variation by IF/11 keys and by rotary
control.
Indication 3digits with annunciator.
Depth accuracy at 1kHz ±4% of setting ±1%. Usable to 5.4 GHz.
Envelope distortion For amodulation rate of 1kHz:
Less than 1% total harmonic distortion for depths up to 30%.
Less than 3% total harmonic distortion for depths up to 80%.
Modulation source Internal LF generator or external via front panel sockets.
External AM accuracy With ALC off the modulation is calibrated for an input level of
1.0 VPD RMS sine wave.
External AM 1dB
bandwidth With modulation ALC off; DC to 30 kHz in DC coupled mode
and 10 Hz to 30 kHz in AC coupled mode. Typical modulation
bandwidth exceeds 50 kHz.
Modulation bandwidth is limited to 1.5 kHz in low noise mode 1.
MODULATION OSCILLATOR
Frequency range 0.1 Hz to 500 kHz (sine wave).
Selection By keyboard entry of data. Variation by 11711 keys and by rotary
control.
1-10 46882-074C

Indication 7digits with annunciators.
Resolution 0.1 Hz.
Frequency accuracy As frequency standard.
Distortion Less than 0.1% THD in sine wave mode at frequencies up to
20 kHz.
Alternative waveforms Atriangular wave is available for frequencies up to 100 kHz.
Asquare wave is available for frequencies up to 2kHz (requires
Option 006 -Avionics or Option 008 -RF Profiles and Complex
Sweep to be fitted).
Signalling tones The modulation oscillator can be used to generate sequential (up
to 16 tones) or sub-audible tones in accordance with ElA, ZVEI1,
ZVEI2, DZVEI, CCIR, EURO 1, EEA, NATEL and DTMF*
standards. Facilities are also available for creating and storing
user defined tone systems.
^Requires second modulation oscillator (Option 001) to be fitted.
EXTERNAL Two independent inputs on the front panel with BNC connectors,
MODULATION EXT MOD 1and EXT MOD 2. The modulation is calibrated
with 1VRMS sine wave applied. Input impedance 100 kQ
nominal.
MODULATION ALC The EXT MOD 1and EXT MOD 2INPUTS can each be levelled
by an ALC system.
Level range 0.7 VRMS to 1.4 VRMS sine wave.
Distortion Less than 0.1% additional distortion for frequencies up to 20 kHz
at 1VRMS sine wave (typically less than 0.1% up to 50 kHz).
1dB bandwidth Typically 10 Hz to 500 kHz.
LF OUTPUT Front panel BNC connector. The output may be configured in
either LF Generator Mode to give an output from the internal
modulation oscillator or in LF Monitor Mode to give an output
from the internal modulation signal paths.
Selection By keyboard entry of data. Variation by 1M keys and by rotary
control.
Indication 7digits with unit annunciators for frequency and 4digits with
unit annunciators for level.
Level 100 LtV to 5VRMS with aload impedance of greater than
600 a
100 pVto 1.4 VRMS with aload impedance of greater than
50 Q.
Common mode voltage ±0.5 Vmaximum.
Source impedance 5.6 0nominal.
46882-074C 1-11

Level accuracy at 1kHz With aload impedance of greater than 10 kQ:~
±5% for levels above 50 mV and ±10% for levels from 500 pV to
50 mV.
Frequency response Typically better than ±1 dB from 0.1 Hz to 300 kHz.
SWEEP
Control modes Start/stop values of selected parameter;
Number of steps;
Time per step.
Step time 1ms to 20 sper step.
Sweep ramp Synchronized analogue ramp with an amplitude of nominally 0V
to 10 Vpeak on rear panel BNC connector.
Markers 5user selectable markers for frequency or level provide an
indication when specified parameter values have been reached.
Output 0Vto +5 Vfrom 600 Oon rear panel BNC socket. }
Trigger Rear panel BNC connector. Applying 0Vor aswitch closure
starts the sweep or steps the sweep from point to point. Socket is
internally connected via 10 k£2 pull-up resistor to +5 V.
FREQUENCY STANDARD
Frequency 10 MHz.
Temperature stability Better than ±5 in 108over the operating range of 0to 50°C.
Warm up time Within 2in 107of final frequency within 10 minutes from switch
on at 20°C ambient.
Aging rate Better than 2in 107per year; better than 5in 1010 per day after 1
month continuous use.
Output Rear panel BNC socket provides an output at frequencies of 1,5
or 10 MHz with anominal 2Vpk-pk level into 50 O.
External input Rear panel BNC socket accepts an input at 1, 5or 10 MHz with a
minimum level of 2Vpk-pk. Maximum input level 5Vpk-pk.
GPIB INTERFACE AGPIB interface is fitted. All functions except the supply switch
are remotely programmable.
Capabilities Complies with the following subsets as defined in IEEE Std.
488.1: SHI, AH1, T6, TE0, L4, LEO, SRI, RL1, PP0, DC1,
DTI, CO, E2.
RADIO FREQUENCY
INTERFERENCE Confirms to EEC directive 76/889 and VDE 0871 as to limits of
RF interference.
SAFETY Complies with IEC 348.
UL 1244 approved.
1-12 46882-074C

viL.iYi.nnu u^i vrimn iiv/n
RATED RANGE OF USE
(Over which full specification
is met).
Temperature
Humidity
CONDITIONS OF
STORAGE AND
TRANSPORT
Temperature
Humidity
Altitude
POWER REQUIREMENTS
AC supply
CALIBRATION
INTERVAL
DIMENSIONS AND
WEIGHT
SECOND MODULATION
OSCILLATOR OPTION
PULSE MODULATION
OPTION
Modulation modes
Rise time
Control
Maximum input level
ON/OFF ratio
0to 55°C.
Up to 93% at 40°C.
-40°C to +7 1°C.
Up to 93% relative humidity at 40°C.
Up to 4600 m(15,000 ft).
Four settings covering 90-115 V, 105-132 V, 188-242 Vand
216-265 V.
45 Hz to 400 Hz.
120 to 180 VA maximum dependant on version and options
fitted.
2years.
(Over projections but excluding front panel handles).
Height Width Depth Weight
152 mm 425 mm 525 mm 21.0 kg
6.0 in 16.6 in 20.5 in 461b
Specification as Modulation Oscillator.
Pulse modulation may be used alone or in conjunction with FM,
<t>M or Wideband FM.
For earner frequencies above 21.09375 MHz less than 15 ns
(typically 5ns) from 10% to 90%.
For carrier frequencies below 21.09375 MHz less than 25 ns from
10% to 90%.
0to +1Vfor carrier off, +3.5 to +5Vfor carrier on.
+5.0 V.
Better than 70 dB at the earner frequency, typically exceeds 80
dB.
46882-074C 1-13

Additional level error Less than ±0.5 dB.
Propagation delay Typically 80 ns from PULSE INPUT to RF OUTPUT.
Typically 5ps with Option 105 (DECT).
Input impedance 50 Q, nominal.
Switching speed Rise and fall times less than 25 ns from 10% to 90%.
Typically 2ps with Option 105 (DECT).
+19 dBm RF OUTPUT
LEVEL OPTION
For 2040 model only.
RF OUTPUT
Range -138 dBm to +19 dBm.
When AM is selected the maximum output level reduces linearly
with AM depth to +13 dBm at maximum AM depth.
SPECTRAL PURITY
At RF levels up to
+7 dBm:
Harmonics Better than -27 dBc.
AVIONICS OPTION See Annex A.
RF PROFILES AND
COMPLEX SWEEP See Annex B.
OPTION
1-14 46882-074C
This manual suits for next models
2
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