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OPERATION & MAINTENANCE
HANDBOOK
Tel: (415) 676-5000 . .
CONCORD INSTRUMENT D I V I S I O N
94518
1 0 Syrtron Drtve r Concord, Caltforn~a U.S.A.
T W X : 910-481-9479 Cable: SYSTRONOONNER
MODEL 700A
PULSE GENERATOR
Part Number 37000 - 690
WARRANTY
Systron-Donner instruments are warranted during a period of one year from date of shipment to
original purchaser to be free from defects in material and workmanship. This warranty does not apply
to vacuum tubes, except as these are warranted by tube manufacturers. The liability of Seller under
this warranty is limited to replacing or repairing any instrument or component thereof which is returned
by Buyer, at his expense, during such period and which has not been subjected to misuse, neglect.
improper installation, repair, alteration, or accident. Seller shall have the right to final determination as
to the existence and cause of a defect. I n no event shall Seller be liable for collateral or consequential
damages. This warranty is in lieu of any other warranty, expressed, implied, or statutory; and no
agreement extending or modifying it will be binding upon Seller unless in writing and signed by a duly
authorized officer.
RECEIVING INSPECTION
Every Systron-Donner instrument is carefully inspected and is in perfect working order at the time of
shipment. Each instrument should be checked as soon as received. I f the unit is damaged in any way, or
fails to operate, a claim should immediately be filed with the transportation company.
Whenever a Systron-Donner instrument requires service, the nearest Systron-Donner representative
should be contacted; all representatives will provide immediate service or arrange factory returns when
necessary.
Please specify both model and serial number in all correspondence concerning Systron-Donner instru-
ments. Address all inquiries on operation or applications to your nearest sales representative; or, Sales
Manager, Concord Instrument Division, Systron-Donner Corporation, 10 Systron Drive, Concord.
California 94518.
-
MODEL S OOA
- Model lOOA Pulse Generator
T h r Datapulsr, M o d r l 1 0 0 A i a a n e c o n o m i c a l h i g h p e r -
forrnanc~ pulse g e n ~ r a k o r r l r s i g n e df o r general purpose t e s t -
- i n g of a v a r i e t y of e l ~ c t r o n i c equipmrnt. Unfqur., all solicl
s t a t e c i r c u i t s reduce conlplpxity and p r o v i d e v e r s a t i l e p e r -
It)rmanc~,in a c u n v e n i c ~ n h l vcompact package. Simultaneous
positive anrl n r g a t i v e outputs d p l i r r r L n a t t s i n t o 513 o h m s ,
+
a n d pulsr r a t e , w i d t h , amplitude, anti rlplay a r e continuously
variable o v e r broarl r a n g e s . F r o n t panel controls select
c i t h e r s i n g l y o r d o u \ ~ I t . p u l s operation, s y n c h r o n o u s o r a s y n -
r
chronous e a t i n g , and e i t h e r i n t e r n a l , external, or manual
- s i n g l e cycIt= t r l g g e r i n c . T w o s y n c h r o n i z i n g t r i g g e r outputs
a r e supplied f o r s v s t e m a p p l i c a t i o n a n d t o provide a reference
for pulse drblay in the s i n ~ l c pulse rnorle.
-
iii
MODEL 1W A
TABLE OF CONTENTS
PAGE
TITLE PAGE i
FRONTISPIECE iii
TABLE OF CONTENTS v
LlST OF SCHEMATICS vi
LlST OF l LLUSTRATIONS vi
LlST OF TABLES vii
SECTION I SPEC1FICATIONS
Repetition Rate
External Trigger
Manual Cycling
Gated Operation
Trigger Outputs
Pulse Mode
Pulse Delay
Pulse Width
Main Pulse Output
Rise and Fall Time
Jitter
Waveform Aberration
Output Protection
Output Mixing
Operating Temperature
Power Required
Physical Characteristics
Accessories Available
SECTION I1 OPERATION
2.1 General Information
2.2 Controls and Connectors
2.3 Functional Verification
2.4 Operating Instructions
2.5 Definitions
SECTION Ill THEORY OF OPERATION
3.1 General Description
3.2 Circuit Description
MODEL 100A
PAGE
SECTION I V MAINTENANCE
4.1 Preventive Maintenance
4.2 Parts Removal
4.3 Troubleshooting
4.4 Calibration
SECTION V PARTS LlST
5.1 Abbreviations and Symbols
5.2 Repetition Rate Switch Assembly
5.3 Pulse Delay Switch Assembly
5.4 Pulse Width Switch Assembly
5.5 Front Panel Assembly
5.6 Back Panel Assembly
5.7 Main Circuit Board Assembly
LlST OF SCHEMATICS
Drawing Number Description
Block Diagram - Model 100A Pulse Generator
Schematic - Model 100A Pulse Generator
Schematic - Power Supply
LlST OF lLLUSTRATIONS
Figure Number Title
Model 1OOA Accessories
Model 100A Controls and Connectors
Front Panel
Model l00A Controls and Connectors
Back Panel
Networks for Transistor Load
Output Decoupling Circuits
Reverse Voltage Protection
Output Mixing
Output Pulse Characteristics
Waveform Diagrams
Repetition Rate Oscillator
Trigger Multivibrator
External Trigger Amplifier
MODEL lOOA
PAGE
Figure Number Title
Delay Multivibrator 3-11
Output Drivers and Amplifiers 3-14
Parts Location - Schematic 37000 - 152 4 -5
Top View - Model 100A 4 -8
Bottom View - Model lOOA 4 -9
LIST OF TABLES
Table Number Title
4-1 Troubleshooting 4 -6
vii
M O D E L l00A
SECTION I
SPECIFICATIONS
1.1 Repetition Rate
R e p e t i t i o n r a t e i s continuously v a r i a b l e f r o m
0. 1 h e r t z t o 10 m e g a h e r t z i n eight d e c a d e r a n g e s f o r e i t h e r
single o r double p u l s e o p e r a t i o n . E f f e c t i v e r a t e s t o 20 m e g a -
h e r t z m a y b e s e t up i n t h e double p u l s e mode.
1.2 External Trigger
T h e e x t e r n a l t r i g g e r input i s a c coupled, and
o p e r a t e s a t 0 t o 10 m e g a h e r t z f r o m f 0 . 2 5 volt p u l s e s with a
m i n i m u m d u r a t i o n of 20 n a n o s e c o n d s , o r 50 h e r t z to
10 m e g a h e r t z f r o m 1 volt r m s s i n e m a v e s . Slope p o l a r i t y
and l e v e l c o n t r o l s p r o v i d e t r i g g e r i n g a t any point on the
input w a v e f o r m m o r e than 0 . 2 5 v o l t s and l e s s than 5 v o l t s
above o r below t h e a v e r a g e d c l e v e l . Input i m p e d a n c e i s
g r e a t e r than 2. 5k o h m s . T h e m a x i m u m t r a n s i e n t a m p l i t u d e
which m a y be applied safely i s +5 v o l t s .
1.3 Manual Cycling
In t h e single p u l s e m o d e , a c t u a t i n g the single
p u l s e pushbutton p r o v i d e s one c y c l e of output ( s i n g l e o r
double p u l s e m o d e ) .
1.4 Gated Operation
The gating m o d e i s s e l e c t e d a s nongated ( c o n t i n u -
o u s ) , s y n c h r o n o u s l y g a t e d , o r a s y n c h r o n o u s l y gated. Signal
l e v e l s m o r e p o s i t i v e than t 2 v o l t s a r e r e q u i r e d t o e n a b l e
the outputs in e i t h e r gated m o d e . The m a x i m u m l e v e l which
may h c applied s a f e l y i s 10 v o l t s .
M O D E L 1O A
O SPECIFICATIONS
1.4. 1 Synchronous Gating
The repetition r a t e o s c i l l a t o r i: n o r m a l l y off in
t h i s m o d e and i s turned on f o r t h e d u r a t i o n of a n applied gate
pulse. Both m a i n outputs and both t r i g g e r output. a r e gated
and synchronized to the gate signal.
1.4.2 Asynchronous Gating
T h e pulse delay c i r c u i t i s gated i n thi: m o d e ,
and the r a t e o s c i l l a t o r o p e r a t e s continuously. Main pul: e
outputs and the r e f e r e n c e t r i g g e r begin with the f i r s t c y c l e
(internally o r externally triggered) after the gate p u l ~ e
o c c u r s and stop when the g a t e pulse s u b s i d e s . The advanced
t r i g g e r i s not gated and o c c u r s a t t h e o s c i l l a t o r repetition
rate.
1.5 Trigger Outputs
1.5. 1 Advanced T r i g g e r
The advanced t r i g g e r i s a positive pulse with a
m i n i m u m amplitude of 1. 7 v o l t s f r o m a 50 ohm s o u r c e , and
i s typically 15 nanoseconds i n duration. Available on i n -
t e r n a l l y t r i g g e r e d o p e r a t i o n s only, the advance t r i g g e r
o c c u r s a p p r o x i m a t e l y 10% of the repetition r a t e period b e -
f o r e the r e f e r e n c e t r i g g e r .
1.5.2 Reference Trigger
The r e f e r e n c e t r i g g e r i s a positive pulse with a
m i n i m u m amplitude of 2 . 0 volts f r o m a 50 ohm s o u r c e , and
i s typically 15 nanoseconds i n duration. When t r i g g e r e d
f r o m a n e x t e r n a l s o u r c e , the r e f e r e n c e t r i g g e r o c c u r s
a p p r o x i m a t e l y 30 nanoseconds a f t e r the e x t e r n a l t r i g g e r .
1.6 Pulse Mode
Single o r double p u l ~ e p e r a t i o n i s zelected h y
o
the pulse mode switch.
SPECIFICATIONS MODEL lOOA
1.6. 1 Single P u l s e
One pulse p e r c y c l e o c c u r s i n the m a i n outputs
a t the end of the d e l a y period.
1. 6.2 Double P u l s e
Two i d e n t i c a l p u l s e s p e r c y c l e o c c u r i n t h e m a i n
outputs, the f i r s t a p p r o x i m a t e l y 40 nanoseconds a f t e r t h e
r e f e r e n c e t r i g g e r , and the second a t a t i m e d e t e r m i n e d by
the pulse delay c o n t r o l s .
Pulse Delay
P u l s e d e l a y i s continuously v a r i a b l e f r o m
40 nanoseconds with r e s p e c t t o t h e r e f e r e n c e t r i g g e r , o r
60 nanoseconds with r e s p e c t to a n e x t e r n a l t r i g g e r , up t o a
m a x i m u m of 10 seconds i n seven d e c a d e r a n g e s with a
1 0 0 : l m u l t i p l i e r . Delay i s v a r i a b l e o v e r a t l e a s t 70% of the
pulse period up to a r e p e t i t i o n r a t e of 1 m e g a h e r t z , d e -
c r e a s i n g to 50% above 4 m e g a h e r t z and 30% a t 10 m e g a h e r t z .
The r e f e r e n c e t r i g g e r i s counted down when the delay i s
g r e a t e r t h a n the pulse p e r i o d , with s t a b l e countdown r a t i o s
g r e a t e r than 100: 1 p o s s i b l e ; the advance t r i g g e r i s not
counted down.
1.8 Pulse Width
P u l s e width i s continuously v a r i a b l e ( m e a s u r e d a t
the 50% point of the leading and t r a i l i n g e d g e s ) f r o m typically
35 nanoseconds (40 nanoseconds m a x i m u m ) to 10 s e c o n d s i n
s e v e n decade r a n g e s with a 1 0 0 : l m u l t i p l i e r . The m a x i m u m
duty cycle i s a t l e a s t 60% and i s typically 7070.
Main Pulse Output
P u l s e amplitude i s continuously v a r i a b l e f r o m
0. 5 to 10 v o l t s into 50 o h m s with simultaneous positive and
negative dc coupled outputs ( b a s e l i n e s a r e at ground). The
s o u r c e impedance d e c r e a s e s with a m p l i t u d e and i s a p p r o x i -
m a t e l y 50 o h m s a t a m p l i t u d e s l e s s than 5 v o l t s .
MODEL IOOA SPECIFICATIONS
1.10 Rise and Fall Time
R i s e t i m e i s l e s s than 5 nanoseconds, and fall
t i m e i s typically l e s s than 7 nanoseconds (10 nanoseconds
~ n a x i m u r n with the outputs t e r m i n a t e d i n 50 ohm r e s i s t i v e
)
loads.
1.11 Jitter
Repetition r a t e , d e l a y , and width j i t t e r a r e l e s s
than 0. 1 5 % (typically 0. 1%) on e a c h range (within the highest
decade on the width and delay r a n g e s with m o r e than
10: 1 c o v e r a g e ) .
1.12 Waveform Aberration
Overshoot, p r e s h o o t , ringing, and top slope
a b e r r a t i o n a r e typically l e s s than f 5 % (with a m a x i m u m of
k70/0) a t a m p l i t u d e s g r e a t e r than 3 volts (with p r o p e r l y
connected 50 ohm t e r m i n a t i o n s ) .
1.13 Output Protection
Output s t a g e s will not be damaged by a n y c o m b i -
nation of front panel c o n t r o l s e t t i n g s and will withstand
s h o r t c i r c u i t s to ground of a n y duration. The i n s t r u m e n t
i s not rated f o r o p e r a t i o n into l o a d s a t o t h e r than ground
potential.
1.14 Output Mixing
S a m e p o l a r i t y outputs m a y be diode mixed with a
negligible l o s s of amplitude. S a m e o r opposite polarity
outputs m a y be r e s i s t o r mixed with a r e s u l t a n t l o s s of
amplitude. Outputs m a y not be d i r e c t l y coupled together.
SPECIFICATIONS MODEL lOOA
1.15 Operating Temperature
The i n s t r u m e n t i s designed f o r operation i n
0
a m b i e n t t e m p e r a t u r e s of 0 t o 50