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Test and Measurement
Division

Operating Manual

SIGNAL GENERATOR
SMG
8Ol.OOOl.52

Printed in the Federal
Republic of Germany
Certified Quality System

Qualitatszertifikat Certificate of quality Certificat de qualit6
Sehr geehrter Kunde, Dear Customer, Cher client,

Sie haben sich fur den Kauf eines You have decided t o buy a Vous avez choisi d'acheter un
Rohde & Schwarz-Produktes ent- Rohde & Schwarz product. You produit Rohde & Schwarz. Vous
schieden. Hiermit erhalten Sie ein are thus assured of receiving a disposez donc d'un produit fabri-
nach modernsten Fertigungsme- product that is manufactured que d'apres les methodes les plus
thoden hergestelltes Produkt. Es using the most modern methods avancees. Le developpement, l a
wurde nach den Regeln unseres available. This product was de- fabrication et les tests respectent
Qualitatsmanagementsystems veloped, manufactured and nos normes de gestion qualite.
entwickelt, gefertigt und gepruft. tested in compliance with our Le systeme de gestion qualite de
Das Rohde 8 Schwarz-Qualitats- quality management system stan- Rohde & Schwarz a kt6 homolo-
managementsystem ist nach I S 0 dards. gue conformement a la norme
9001 zertifiziert. The Rohde & Schwarz quality I S 0 9001.
management system is certified
according t o I S 0 9001.
Safety Instructions
This unit has been designed and tested according to the standards outlined overleaf and has leff the
manufacturer's premises in a state fully complying with the safety standards.

In order to maintain this state and to ensure safe operation, observe the following instructions, symbols
and precautions.

When the unit is to be permanently cabled, first connect protective ground conductor before
making any other connections.

Built-in units should only be operated when properly fitted into the system.

For permanently cabled units without built-in fuses, automatic switches or similar protective
facilities, the AC supply line shall be fitted with fuses rated to the units.

Before switching on the unit ensure that the operating voltage set at the unit matches the line
voltage.
If a different operating voltage is to be set, use a fuse with appropriate rating.

Units of protection class I with disconnectible AC supply cable and plug may only be operated
from a power socket with protective ground contact.
The protective ground connection should not be made ineffective by an extension cable.
Any breaking of the protective ground conductor within or outside of the unit or loosening of the
protective ground connection may cause the unit to become electrically hazardous.
The protective ground conductor shall not be interrupted intentionally.

Before opening the unit, isolate it from the AC supply.
Adjustment and replacement of parts as well as maintenance and repair should be carried out only
by specialists approved by R & S.
Observe safety regulations and rules for the prevention of accidents.
Use only original parts for replacing parts relevant to safety (e.g. power onfoff switches, power
transformers or fuses).

Also observe the additional safety instructions specified in this manual.

Explanation of Symbols Used

A - Read operating manual, observe the safety symbols used
- Caution, shock hazard
A ,
@ - Protective ground connection

- Unit ground
- Equipotential (floating ground)
EC Certificate of Conformity

Certificate No.: 9502164

This is to certify that:

Equipmenttype Order No. Desiqation

SMG-B1 0802.0005.02 Reference Oscillator OCXO
SMG-B2 0802.0405.02 AF Synhesizer
SMG-B3 0801.9609.02 X Output

complies with the provisions of the Directive of the Council of the European Union on the
approximation of the laws of the Member States

- relating to electromagnetic compatibility
(891336lEEC revised by 91/263/EEC, 92/31IEEC)

Conformity is proven by compliance with the following standards:

Affixing the EC conformity mark as from 1995

ROHDE & SCHWARZ GmbH & Co. KG
Miihldorfstr. 15, D-81671 Miinchen

Munich, 27.1 1.95 Central Quality Management FS-QZ/ Becker
Contents of SMG Manual

Operating Manual

1 . Data Sheet

2. Preparation for Use and Operating Instructions
3 . Maintenance

Service Manual

4. Service Manual for Complete Instrument

5. Service Instructions for the Individual PC Boards
Order No. Index
Keyboard/Display ...................
........................... 801.1366.02 ....... 21
.......
FRN LOOP
RF Oscillator
Output Stage
......................
.......................
801.3917.02
801.5110.02 ....... 3
....... 45
Processor ..........................
.......................
801.3217.02
801.2410.02 .......
....... 7
AF Generator
Power Pack .........................
RF Attenuation Set .................
801.7312.02
801.1614.02
801.1108.02
....... 8
.......
6

Reference Oscillator, OCXO
(Option SMG-B1) ....................
AF Synthesizer (Option SMG-B2, B 2 1 )
802.0005.02
802.0405.02
....... 9
....... 10
X Output (Option SMG-B3) ......,.... 801.9609.02 ....... 10
Table of Contents

Paqe
1 Data Sheet

2 Preparation for Use and Operation

21
. Legend to Front and Rear Views Figs 2-1 and 2-2 21
.

2.2 Preparation for Use ............................. 2.5
2.2.1 Power Supply Fuse ............................... 2.5
2.2.2 AC Power Supply ................................. 2.5
2.2.3 Rack Mounting ................................... 2.5
Operation ....................................... 2.6
Status Upon Switchinq On ........................ 2.13
Internal/External Reference Frequency ........... 2.14
Frequency (RF) .................................. 2.16
Frequency Offset (RF OFFSET) .................... 2.17
Level ........................................... 2.19
Level Offset .................................... 2.20
Non-interruptinq Level Setting .................. 2.21
Level Control Without Function .................. 2.22
Level EMF ....................................... 2.22
Internal AF Modulation Frequency ................ 2.23
AF Amplitude .................................... 2.25
Modulation. AM .................................. 2.27
Modulation. FY .................................. 2.29
Modulation. O M .................................. 2.31
Modulation. FSK ................................. 2.33
Pulse Modulation. PM ........................... 2.34
Pulse Modulation (Code 29) ...................... 2.34
Pulse Modulation with Level Control Voltaqe
from Table ...................................... 2.34b
2.3.16.3 Pulse Modulation (Code 19) ...................... 2.34~
2.3.17 Modulation. External Source ..................... 2.35
2.3.18 Modulation. Two-tone ............................ 2.37
2.3.19 Variation. Rotary Knob .......................... 2.38
2.3.20 Rotary Knob. Step Size .......................... 2.40
2.3.21 Variation. HOLD ................................. 2.41
2.3.22 Variation. AREF ................................. 2.41
2.3.23 Variation. Step ................................. 2.42
Page

Sweep (RF) ................................... .
Sweep (RF). Parameter Entry .....................
Sweep (RF). Operatinq Modes .....................
Sweep (RF). Display .............................
Sweep (RF). Logarithmic .........................
Sweep (AF) ......................................
Sweep (AF). Parameter Entry .....................
Sweep (AF). Operating Modes .....................
Sweep (AF). Display .............................
Sweep (AF). Logarithmic .........................
Sweep (RF. AF). X Output and Z Output ...........
Store -
Recall ..................................
Sequence ........................................
Special Functions ...............................
Self-test .......................................
Status ...........................................
Instrument Preset ...............................
IEC-bus Address .................................
. Remote Control of Instrument via IEC Bus ........
Interface Description ...........................
Setting the Device Address ......................
Local/Remote Switchover .........................
Interface Messages ..............................
Universal Commands ..............................
Addressed Commands ..............................
Device Messages .................................
Commands Received by the SMG in Listener Mode ...
Messages Transmitted by SMG in Talker Mode ......
Common Commands .................................
Device-specific Commands ........................
Alternatives for the Command Syntax .............
Service Request and Status Reqister .............
Timing of Command Processing and Synchronization
Error Handling ..................................
Resetting Device Functions ......................

2.5 Options ......................................... 2.108
Contents

Page

Maintenance

.....
R e q u i r e d M e a s u r i n g Equipment and Accessories 3.1

T e s t i n g t h e Performance Data ..................... 3.3

D i s p l a y and Keyboard ............................. 3.3
Frequency S e t t i n g ............................... 3.3
Reference Frequency .............................. 3.3
S e t t l i n q Time .................................... 3.4
Output Level ..................................... 3.5
Attenuation Set .................................. 3.5
Non-interrupting Level S e t t i n q ................... 3.6
.................... 3.6
Output R e f l e c t i o n C o e f f i c i e n t
~armonics ........................................ 3.7
Spurious ......................................... 3.8
SSB P h a s e N o i s e .................................. 3.8
Broadband N o i s e .................................. 3.10
Residual F M ...................................... 3.11
Modulation Generator ............................. 3.12
Function T e s t of t h e External Modulation
Level Monitoring ................................. 3.12
AM M o d u l a t i o n Depth .............................. 3.13
AM D i s t o r t i o n .................................... 3.13
AM F r e q u e n c y Response ............................ 3.13
AM DC ............................................ 3.14
R e s i d u a l AM ...................................... 3.14
I n c i d e n t a l cbM a t AM ............................. 3.14
F Deviation Setting
M ............................. 3.15
F Distortion
M .................................... 3.15
F Frequency Response
M ............................ 3.15
F r e q u e n c y O f f s e t a t F DC
M ........................ 3.15
~ n c i d e n t a lAM a t F M .............................. 3.16
@ M Deviation S e t t i n g ............................. 3.16
@M Distortion .................................... 3.16
O M F r e q u e n c y Response ........................... 3.17
Overvoltaqe Protection ........................... 3.17
P u l s e Modulation ................................. 3.17
P e r f o r m a n c e T e s t Report ......................... 3.18
2 Preparation for Use and Operation
The values specified in this section are not guaranteed; only the
specifications of the data sheet are binding.
All underlined numbers refer to the items of front and rear
views Figs. 2-1 and 2-2 in the Appendix.

21
. Legend to Front and Rear Views Figs 2-1 and 2-2

Label Function

FREQUENCY RF display. Further informa-
tion in section 2.3, Opera-
tion.

PARAMETER ON/OFF The PARAMETER ON/OFF keypad
is used to set the parameter
to which numerical entries
and variations then apply.
Parameters can be switched on
or off using the ON/OFF keys.
Further information in sec-
tion 2.3, Operation.

MODULATION Display of the modulation
depth, deviation and AF.
Further display functions in
section 2.3, Operation.

DATA ENTER/UNITS Numerical keypad for the
parameter set in the PARA-
METER keypad.
Further information in sec-
tion 2.3, Operation.

AMPLITUDE Display of the RF or AF
level. Further display func-
tions in section 2.3, Opera-
tion.
Function I
VARIATION Keypad to vary the parameter
set in the PARAMETER keypad
using the rotary knob or the
STEP ++ keys.
Further information in sec-
tion 2.3, Operation.

SWEEP Keypad to select the operat-
ing mode and to switch the
sweep on and off.
Further information in sec-
tion 2.3, Operation.

BNC output of internal AF
signal; level adjustable
with SMG-B2 AF synthesizer
option. Further information
in sections "Internal AF
Modulation Frequency" and
"AF Arnpli tude" .
BNC inputs for external modu-
lation signals. Input impe-
dance 100 ki2 ( 6 0 0 a ) .
Further information in sec-
tion "Modulation, External
Source".

POWER Power switch
I
RF output,
N socket 50 Q.

LOCAL Key for switching to manual
operation and for entry or
IEC ADDR display of IEC-bus address.
Further information in sec-
tion "IEC-bus Address".
-

No. Label Function
-
-
13 REMOTE LED t o i n d i c a t e t h e remote
state.

SHIFT Key t o s e l e c t t h e SHIFT f u n c -
tions. Further information
i n s e c t i o n 2.3, O p e r a t i o n .

STATUS Key f o r s t a t u s c h e c k or f o r
instrument preset. Further
INSTR PRESET information i n sections
" S t a t u s " and " I n s t r u m e n t
Presetn .
MEMORY Keypad t o s t o r e i n s t r u m e n t
s e t t i n g s , t o c a l l stored
s e t t i n g s and f o r t h e s e q u e n c e
function. Further information
i n section "Store - Recall"
and "Sequence".

O p t i o n SMG-B1 The i n s t r u m e n t i s f i t t e d w i t h
Reference O s c i l l a t o r o p t i o n s a s g i v e n by t h e ad-
hered l a b e l s .
O p t i o n SMG-B2
AF S y n t h e s i z e r
O p t i o n SMG-B3
X Output

Fuse v a l u e s f o r t h e d i f f e r e n t
AC power s u p p l ies.

F u s e h o l d e r and power s u p p l y
selector.

Power s u p p l y c o n n e c t i o n .
Label Function

-@ AM EXT ( X-Axis) 3 cut-outs provided e i t h e r
f o r f i t t i n q t h e corresponding
-@ FM/@M EXT ( Z - A x i s ) f r o n t panel sockets to t h e
r e a r p a n e l or f o r accommodat-
AF INT i n q t h e s o c k e t s X-Axis a n d
Y-Axis i f t h e X O u t p u t o p t i o n
SMG-B3 is f i t t e d .

Output of t h e i n t e r n a l r e f e r -
e n c e f r e q u e n c y ( l e v e l 0 dBm)
w i t h an i n t e r n a l r e f e r e n c e .
Input of t h e external refer-
e n c e f r e q u e n c y ( l e v e l > I 0 0 mV
s i n e wave or TTL) w i t h a n
external reference.
I The i n p u t or o u t p u t f r e q u e n c y
c a n be s e l e c t e d a s 5 MHz or
' 1 0 MHz u s i n g a n i n t e r n a l
jumper.
F u r t h e r i n f o r m a t i o n i n sec-
t i o n " I n t e r n a l / E x t e r n a l Ref-
e r e n c e Frequency".

' fEC 6 2 5 I E E E 488 IEC-bus c o n n e c t o r f o r remote
control.

I Cut-out provided f o r f i t t i n g
1 t h e f r o n t p a n e l RF o u t p u t t o
1 t h e r e a r panel.

BNC i n p u t f o r p u l s e modula-
t i o n (TTL i n p u t ) .
I f t h e TTL s i g n a l is a t LOW ':
l e v e l , t h e RF l e v e l i s
blanked.
F o r f u r t h e r i n f o r m a t i o n , see '

s e c t i o n " M o d u l a t i o n , PMn.
2.2 P r e p a r a t i o n f o r U s-
e

2.2.1 Power S u p p l y F u s e

he power s u p p l y f u s e is l o c a t e d i n t h e h o l d e r 2 ( F i g s . 2-2 a n d
2 - 3 ) . The v a l u e o f t h e f u s e f o r d i f f e r e n t power s u p p l i e s c a n b e
o b t a i n e d f r o m t h e l a b e l 18 ( F i g . 2-2). The f u s e h o l d e r c a n b e r e -
moved by i n s e r t i n g a s c r e w d r i v e r i n t o t h e cut-out on t h e r i g h t ,

Fig. 2-3 Power s u p p l y p l u g , v o l t a g e selector a n d f u s e h o l d e r

2.2.2 AC P o w e r S u p p l y

The SMG c a n b e u s e d w i t h power s u p p l i e s o f 400 V, 1 2 0 V, 2 2 0 V
a n d 240 V. Check t h a t t h e v o l t a g e s e l e c t o r 1s s e t t o t h e c o r r e c t
s u p p l y b e f o r e u s i n g t h e i n s t r u m e n t . To a d j u s t t o the l o c a l s u p -
p l y , i n s e r t t h e r e q u i r e d f u s e d i n s e r t t h e f u s e h o l d e r a g a i n and
r o t a t e u n t i l t h e v a l u e o f t h e power s u p p l y is a t t h c t o p u n d e r -
n e a t h t h e arrow,

A f u s e t y p e T 2 . 0 D is r e q u i r e d f o r 1 0 0 V a n d 1 2 0 V a n d t y p e
T 1 . 6 D f o r 220 V a n d 240 V.

2.2.3 Rack H o u n t i n g

T h e SMG c a n be f i t t e d i n t o a n y 19" rack u s i n g the 19" adapter
ZZA-93 ( O r 4 . No. 3 9 6 . 4 8 9 2 . 0 0 ) ,

When f i t t i n q i n t o a r a c k , e n s u r e t h a t the a i r i n l e t t h r o u g h t h e
p e r f o r a t i o n s i n t h e s i d e p a n e l s ?r.d ".he a i r o u t l e t a t t h e r e a r
a r e not i m p e d e d .

F i t t i n q i n s t r u c t i o n s a r e i n c l u d e d w i t h t h e 19" a d a p t t r ,
The s i g n a l g e n e r a t o r SMG o u t p u t s s i q n a l s b e t w e e n 1 0 0 kHz and
1 0 0 0 MHz a t t h e RF o u t p u t i n a l e v e l r a n q e f r o m 4 3 dBm1 (16 dRm)
t o - 1 4 0 . 4 dBm w i t h AM, PM, F or + M . Two-tone m o d u l a t i o n
M is a l s o
p o s s i b l e a s w e l l a s s i m u l t a n e o u s AM a n d P M o r AM a n d QM. The
o u t p u t s i q n a l may b e set a t a f i x e d f r e q u e n c y o r s w e p t ,

A s i q n a l i n t h e f r e q u e n c y r a n a e f r o m 10 Hz t o 1 0 0 kHz w i t h a n am-
p l i t u d e r a n g e f r o m 1 m t o 1 V (Vrms) i s a v a i l a b l e a t t h e AP
V
o u t p u t i f t h e SMG is f i t t e d w i t h t h e o p t i o n AF S y n t h e s i z e r SMG-
B2.

The S G can h e s e t v i a t h e k e y b o a r d ,
M r o t a r y k n o b and t h e IEC-bus
interface.

Fig, 2-4 S G front panel
M
Selecti~nof p a r a m e t e r s

The PAWETER ON/ PF keypad 2 i s u s e d t o s e t t h e p a r a m e t e r f o r
w h i c h n u m e r i c a l e n t r i e s and v a r i a t i o n s t h e n a p p l y . The s e t p a r a -
meter i s i n d i c a t e d by a n LED. O n l y o n e p a r a m e t e r c a n be s e t a t a
t i m e . The o n l y e x c e p t i o n i s t h e STEP p a r a m e t e r which c a n be s e t
a t t h e same time as a n o t h e r p a r a m e t e r ( t o . e n t e r t h e s t e p s i z e f o r
t h e STEP f u n c t i o n ) .

The SHIFT parameters (blue label)