Philips PM 5132 User manual

Function generator O1HZ-2MHz
PM 5132
9445 051 32001
Instruction manual provisional
9499 453 00202
g00101/1
Scientific & Industrial equipment division
PHILIPS

Function
generator
O1Hz-2MHz
PM
5132
9445 051 32001
Instruction
manual
provisional
Geratehandbuch
Mode
demploi
et
d‘entretien
9499
453
00202
gootoi1/
1
PHILIPS

CONTENTS
1.1.
1.2.
1.3.
1.4.
2.1.
2.2.
2.3.
2.4.
2.5.
3.1.
3.2.
4.1.
4.2.
4.3.
4.4.
4.5.
GENERAL
Introduction
Technical data
Accessories
Operating principle
INSTALLATION
Safety regulations
Mounting
Earthing
Dismantling the instrument
Mains connection
OPERATING INSTRUCTIONS
Control! and sockets
Operation
SERVICE PART
Circuit description
Access to parts
Check and adjustment
Check after repair and maintenance
Parts list
FIGURES
. Block diagram
. Front view
. Rear view
. Unit 2 component layout
. Unit 1, component layout
. Overall circuit diagram
oar WN
CODING
SYSTEM
OF
FAILURE
REPORTING
FOR
QUALITY
ADDRESSES FOR SALES AND SERVICE
oo aa a
11
12
12
12
12
13
13
14

INHALTSVERZEICHNIS
1. ALLGEMEINES
1.1. Einleitung
1.2. Technische Daten
1.3, Zubehor
1.4. Funktionsprinzip
2.
VORBEREITUNGSANWEISUNGEN
2.1.
Sicherheitstechnische
Hinweise
2.2. Aufstellen
2.3. Erden
2.4, Offnen des Gehduses
2.5. NetzanschluR&
3. BETRIEBSANLEITUNG
3.1. Bedienelemente und Anschliisse
3.2. Bedienung
5. BILDVERZEICHNIS
1. Blockschaltbild
2. Frontansicht
3. Riickansicht
17
17
17
21
22
23
23
24
24
24
24
25
25
26
TABLE DES MATIERES
1. GENERALITES
1.1. Introduction
1.2.
Caractéristiques
techniques
1.3.
Accessoires
1.4.
Principe
de
fonctionnement
2.
INSTALLATION
2.1.
Consignes
de
sécurité
2.2. Montage
2.3. Mise a la terre
2.4. Démontage de |‘appareil
2.5.
Branchement
de
|’appareil
3:
MISE
EN
SERVICE
3.1. Commandes et douilles
3.2. Fonctionnement
5.
RAPPEL
DES
FIGURES
1. Schéma synoptique
2. Face avant
3. Face arriere
29
29
29
33
34
35
35
36
36
36
36
37
37
38

Operating manual

1.1.
1.2,
1.2.1.
GENERAL
INTRODUCTION
The
PM
5132
function
generator
is
an
instrument
designed
for
applications
extending
from
the
educa-
tional
to
the
genera!
purpose
area.
It
produces
sinewave,
triangular
and
squarewave
output
signals
as
well
as
positive
and
negative
pulses,
the
frequencies
of
which
are
adjustable
in
seven
linear
sub-ranges
from
0.1
Hz
to
2
MHz.
The
frequency
vernier
allows
the
frequency
setting
to
be
varied
from
-5%
to
+5
%.
The
output
voltage
is
continuously
adjustable
from
3
Vpp
to
30
Vpp
and
can
be
attenuated
in
steps
of
10
dB
to
60
cB.
A
continnously
adjustable
d.c.
output
voltage
can
be
selected
seperately
or
whenever
used
as
d.c.
offset
voltage
added
to
the
selected
output
signal.
The
internal
resistance
of
the
generator
can
be
selected
by
means
at
a
pushbutton
between
50
Q
and
600
2.
The
duty
cycle
can
be
set
to
a
fixed
value
of
50
%
or
is
continuously
adjustable
between
10
%
and
90
%.
The
generator
frequency
is
controllable
in
each
of
the
seven
sub-ranges
(internal
sweep).
The
sweep
period
is
adjustable
within
a
range
of
0.05
s
to
100
s.
Moreover
external
sweep
and
frequency
modula-
tion
can
be
performed.
For
TTL
applications
a
seperate
output
is
available.
The
ergonomic
design
of
controls
and
sockets
serves
for
convenient
operating
of
the
instrument.
TECHNICAL DATA
General information:
On
delivery
from
the
factory,
the
instrument
complies
with
the
safety
regulations
of
measuring
and
control
equipment.
The
information
and
warnings
contained
in
this
instruction
manual
must
be
followed
by
the
user
to
ensure
safe
operation
and
to
maintain
the
instrument
in
a
safe
condition.
—
Only
data
with
indicated
tolerances
or
limits
are
guaranteed;
data
without
tolerances
are
given
only
for
guidance.
—
All
specifications
will
be
met
after
a
warm-up
time
of
30
min.,
when
keeping
the
instrument
in
a
constant
mounting
position.
—
Inaccuracies
(absolute
or
in
%)
relate
to
the
indicated
reference
value.
SPECIFICATIONS
Frequency
Frequency
range
0.1
Hz
-
2MHz
Selected
range
|
0.4
Hz
-
2
Hz
i
1
Hz
-
20
Hz
lit
10
Hz
-
200
Hz
IV
100
Hz
-
2kHz
Vv
1
kHz
-
20
kHz
VI
10
kHz
-
200
kHz
Vil
100
kHz
-
2MHz

1.2.2.
Characteristic
Adjustments
Frequency indication
Setting error
Vernier frequency adjustment
Temperature coefficient
Short term drift
Long term drift
Signal output
Connection
Impedance
Load capability
Wave forms
Duty cycle
Open-circuit voltage
— setting range
maximum value
DC (offset) voltage
— button PUSH FOR ZERO pulled,
open circuit voltage
— button PUSH FOR ZERO or
WAVE FORM button DC pressed
Attenuation
— continuous
— fixed
Distortion (sinewave)
Linearity (triangular wave)
linear
— seven range-pushbuttons
— dia! with linear scale
— knob for fine-adjustment
— linear scale on the dial
42% +0,2 % of full scale
+5 % of the dial setting
<0,1%/K ranges I! - VI
<0,15 %/K ranges | - VII
<0,15% ranges Il - VI
<0,20% ranges |- Vilwithin 15 min.
<0,25 % within 7 hours
BNC socket
50
92/600
2,
selected
by
pushbutton
short-circuit proof
rv sinewave
Av triangular wave
TL squarewave
MW positive squarewave
ur— negative squarewave
DC d.c. voltage without a.c.
adjustable
from
10
%
to
90
%
when
pushbutton
DUTY
CYCLE
is
pressed
3
Vpp
to
30
Vpp,
continuously
adjustable
1,5
Vpp
to
15
Vpp
for
positive
and
negative
squarewaves
+15 V
-10 to +10 V, continuously adjustable
<50 mV
0
to
20
dB
(output
voltage
adjustable
from
3
Vpp
to
30
Vpp)
0
to
60
dB
in
steps
of
10
dB
<0,5 % in ranges | to V
<1 %inrange VI
<3 %inrange VII
<1%

1.2.3.
1.2.4.
1.2.4.1.
risetime, falltime
(squarewave)
overshoot and ringing
(squarewave)
Amplitude response
(sinewave, reference
value = 1 KHz;)
TTL-output
Connection
Duty cycle, frequency
Fan out
Frequency control
Internal sweep
Sweep modes
Sweep characteristic
Start frequency
Stop frequency
Sweep period
Sweep control elements
<75 ns
<2% ‘(output voltage 30 Vpp)
<0,1 dB in ranges | to V
<1 dBinranges | to Vil
(output voltage 3... 30 Vp, load 50 &,
attenuation 0 dB).
BNC socket at the rear side
identical with main output
2 20 TTL inputs
—
single
sweep
started
by
a
pulse
(SWEEP
TRIG
INPUT)
—
single
sweep
started
by
pressing
the
pushbutton
TRIG
— continuous sweep
single sweep
f
——-—
continuous
sweep
f STOP
{START
linear
continuously
adjustable
within
the
respective
frequency
range
after
the
pushbutton
STD
BY
/
CONT
is
set
to
STD
BY.
identical to the dial adjustment
50 ms to 100 s, adjustable in three ranges:
—50mstols
—0,5 sto10s
—5 sto 100s
— pushbutton to start a single sweep
—
pushbutton
to
stop
the
running
sweep
immediately
—
pushbutton
for
resetting
to
f
star
Ppuring
the
sweep

1.2.4.2.
1.2.5.
SWEEP TRIG INPUT
— Connection
— Impedance
— Max. input voltage
— Release criterion
SWEEP
VOLTAGE
OUTPUT
~
Connection
—
Impedance
— Output voltage
PEN LIFT
— Connection
BNC socket at the rear side
>10KQ
+15 V
negative
going
edge
of
a
pulse
(from
High
to
LOW);
e.g.
TTL
signal
with
fall
time
<8
ms
BNC socket at the rear side
10 KQ
OVtO5V lteraRr--:tstor }
BNC socket at the rear side
electronic
switch,
open
during
flyback,
closed during the sweep.
max.
current:
200
mA
electronic
switch
output
voltage:
<
0,7
V
4closed
output
voltage:
+15
V
electronic
switch
internal
resistance:
ee
open
External
sweep
or
frequency
modulation
(SWEEP
INPUT)
— Connection
= Voltage vs. frequency characteristic
— Impedance
— Max. sweep range
— Max. sweep frequency
— Sensitivity
Power supply
— Reference value
— Nominal vaues
— Nominal operating range
— Operating limits
— Nominal frequency range
— Power consumption
BNC socket
linear
47 KQ
2 1/2 decades
15 KHz
1V/0,2
fe
where
f_.,
represents
the
upper
limit
of the corresponding subrange.
AC mains
220 V
110
V/128
V
/
220
V
/
238
V,
selectable
by
solder
links
+10 % of selected nominal value
+10 % of selected nominal value
50 Hz to 100 Hz
25W

1.2.6.
1.2.7,
1.3.
1.3.1.
1.3.2.
Environmental conditions
Ambient temperature
— Reference value
—
Nominal
operating
range
— Limits for storage and transit
Relative humidity
— Reference range
-- Nominal operating range
oe Limits for storage and transit
Air pressure
— Reference value
— Nominal working range
Air speed
-- Reference value
— Nominal working range
Operating position
Warm-up time
Cabinet
Protection type
(see DIN 40 050)
Protection class
(see IEC 348)
Overall dimensions
— height
— width
— dupth
Weight
ACCESSORIES
Standard
Optional
+23°C #1°C
+ 5°C to +40°C
-40° C to +70° C
45 % to 75%
20% to 80%
0% to 90 %
1013 mbar (= 760 mmHg)
800 - 1066 mbar (up to 220 m height)
0 to 0,2 m/s
0 to 0,5 m/s
normally
upright
on
feet
or
with
handle
fold
down
30 min.
IP 20
class |, protective conductor
140 mm
310 mm
330 mm
approx. 5 kg
Instruction manual, fuse 0,4 AT
adhesive labels 110 V / 128 V / 238 V
PM 9585: 50 2 termination 1 W
PM 9075: Coaxial connection cable BNC - BNC

10
1.4.
OPERATING
PRINCIPLE
(see
Fig.
1.,
block
diagram)
The
main
oscillator
of
the
function
generator
comprises
the
switched
integrator
and
the
peak
detector
(comparator).
The
controlled
current
source
of
the
d.c.
control
section
generates
the
charging
current
for
the
integrator.
At
the
integrator
output
a
linear
voltage
ramp
is
fed
to
the
peak
detector.
When
reaching
the
reference
voltage
the
detector
reverses
the
charging
current
of
the
integrator
resulting
in
integration
in
the
opposite
direction.
Integration
down
is
performed
until
reaching
the
negative
reference
level
of
the
peak
detector,
which
again
reverses
the
current
of
the
switched
integrator.
As
both
reference
levels
are
symmetrical
with
respect
to
earth,
a
zero
symmetrical
triangular
wave
is
generated
at
the
output
of
the
integrator.
The
duty
cycle
of
this
wave
is
1:
1
and
can
be
adjusted
continuously
between
10
%
and
90
%
when
push-
button
DUTY
CYCLE
is
pressed.
The
output
current
of
the
controlled
current
source
depends
on
the
positions
of
the
frequency
dial
and
the
FREQUENCY
OFFSET
control.
The
resulting
frequency
of
the
oscillator
is
determined
by
this
current
and
-in
addition-
by
the
integrating
capacitor
in
the
switched
integrator.
Different
capacitors
are
switched
in
by
the
FREQUENCY
Hz
pushbuttons.
External
sweep
and
frequency
modulation
can
be
performed
via
the
SWEEP
INPUT
socket.
The
voltage
to
frequency
relationship
is
linear.
Internal
frequency
control
is
effected
by
the
sweep
oscillator.
Starting
a
single
sweep
can
be
done
by
pressing
the
pushbutton
TRIG,
a
continuous
sweep
is
started
by
setting
the
pushbutton
STD
BY
/
CONT
to
position
CONT.
Moreover
it
is
possible
to
start
a
sweep
by
means
of
an
external
trigger
pulse
connec-
ted
to
the
SWEEP
TRIG
INPUT
socket.
The
sweep
range
is
adjustable
by
means
of
the
knob
START
FREO
and
the
dial
which
represents
the
stop
frequency.
They
are
adjustable
independantly;
the
start
frequency
may
be
set
greater
or
less
than
the
stop
frequency.
Moreover
the
outputs
PEN
LIFT
and
SWEEP
out
are
controlled
by
the
sweep
oscillator.
The
PEN
LIFT
socket
represents
the
output
of
an
electronic
switch
being
closed
during
the
sweep.
The
SWEEP
OUT
socket
gives
the
instantaneous
sweep
voltage
corresponding
to
a
distinct
frequency
of
the
oscillator:
O
V
=
start
frequency,
+5
V
=
stop
frequency
fsrop
.
The
voltage
to
frequency
relationship
is
linear.
The
WAVE
FORM
switch
allows
the
following
wave
forms
to
be
selected:
a
triangular
wave
from
the
integrator,
a
sine
wave
formed
by
the
sine
shaper
circuitry
from
the
triangular
wave,
a
square
wave,
negative
and
positive
pulses
from
the
peak
detector.
The
selected
signal
is
fed
to
the
OUTPUT
socket
via
amplifier
and
attenuator.
The
internal
resistance
can
be
switched
to
600
2
or
to
5022.
By
means
of
the
DC
OFFSET
control
a
d.c.
voltage
can
be
added
to
the
signal,
activated
by
pulling
the
PUSH
FOR
ZERO
switch/turn-knob.
If
d.c.
voltage
only
is
requested,
the
a.c.
part
of
the
output
signal
can
be
switched
off
by
pressing
the
DC
pushbutton
of
the
wave
form
selector.
A
squarewave
signal
of
the
peak
detector
is
fed
to
the
socket
TTL
OUT
via
the
TTL
buffer.
The
stabilized
power
supply
provides
the
d.c.
voltages
for
the
circuitries.

2.1,
2.1.1,
2.1.2.
11
INSTALLATION
SAFETY REGULATIONS
Upon
delivery,
the
instrument
complies
with
the
required
safety
regulations.
To
maintain
this
condition
and
to
ensure
safe
operation,
it
is
recommended
to
follow
the
instructions
below.
Before connecting
Mains voltage
Check whether the instrument is adapted to the nominal mains voitage.
Protection
This
instrument
is
protected
according
to
class
|
(protective
earth)
of
the
IEC
348
or
VDE
0411.
The
mains
cable
provides
earth
connection.
Outside
specially
protected
rooms,
the
mains
plug
must
be
con-
nected
only
to sockets
with
earthed
contact.
It is not allowed to interrupt the earth connection inside or outside the instrument.
Maintenance and repair
Failure and excessive stress
If the instrument is suspected of being unsafe, take it out of operation permanently.
This is the case when the instrument
— shows physical damage
— does not function anymore
— is stressed beyond the tolerable limits (e.g. during storage and transportation)
Dismantling the instrument
When
removing
covers
or
other
parts
by
means
or
tools,
live
parts
or
terminals
could
be
exposed.
Before
opening
the
instrument,
disconnect
it
from
all
power
sources.
If the open live instrument needs calibration, maintenance or a repair, it must be performed only by
trained
personnel
being
aware
of
the
risks.
After
disconnection
from
all
power
sources,
the
capacitors
in the instrument may remain charged for some seconds, oberserve the circuit diagrams.
Fuses ‘
Only use the specified fuses.
Repair, Replacing parts
Repairs must be made by trained personnel. Ensure that the construction of the instrument is not altered
to
the
detriment
of
safety.
Above
all,
leakage
paths,
air
gaps
and
insulation
layers
must
not
be
reduced.
When
replacing,
use
only
original
parts.
Other
spare
parts
are
only
acceptable
when
the
safety
precautions
for
the
instrument
are not
impaired.

12
2.2.
2.3.
2.4.
2.5,
MOUNTING
The
instrument
may
be
used
in
any
desired
position.
With
the
handle
fold
down,
the
instrument
may
be
used
in
sloping
position;
for
this
purpose
press
the
buttons
of
the
handle
(Fig.
2).
Do
not
position
the
instrument
on
any
surface
which
produces
or
radiates
heat,
or
in
direct
sunlight.
EARTHING
Before
switching
on,
the
instrument
must
be
earthed
in
conformity
with
the
local
safety
regulations.
The
mains
cable
fixed
to
the
instrument
includes
a
protective
conductor,
which
is
connected
to
the
earth
contacts
of
the
plug.
Thus,
when
connected
to
an
earthed
mains
socket,
the
cabinet
of
the
instru-
ment
is
consequently
connected
to
the
protective
earth.
WARNING:
Connect
the
mains
cable
plug
only
to
a
socket
with
protective
earth
contacts.
This
pro-
tection
must
not
be
made
ineffective,
e.g.
by
using
an
extension
cable
without
earth
protection!
The
circuit
earth
potential
applied
to
the
external
contacts
of
BNC
sockets
is
connected
to
the
cabinet.
The
external
contacts
of
the
BNC
sockets
must
not
be
used
to
connect
a
protective
conductor.
DISMANTLING THE INSTRUMENT
— Unplug the mains connector
—
Fold
up
the
handle
to
the
top.
For
this
push
the
buttons
of
the
handle
—
Loosen
the
central
screw
at
the
rear
—
Remove
the
lead-through
of
the
mains
cable
from
the
cabinet
— Dismantle the cabinet
MAINS CONNECTION
The
instrument
must
be
connected
only
to
an
AC
supply.
On
delivery
the
instrument
is
set
to
220
V.
Before
mains
connection,
ensure
that
the
local
mains
voltage
ranges
within
the
set
mains
voltage
range
indicated
on
the
plate
at
the
rear
of
the
instrument.
if
the
instrument
is
to
be
used
on
110
V,
128
V,
238
V
supply,
proceed
as
follows:
— Unplug the mains connector
— Dismantle the instrument, see 2.4.
—
Resolder
links
on
the
mains
transformer
in
accordance
with
the
stick-on
connection
diagram.
See
also
below.
—
When
switching
to
110
V
or
128
V
insert
the
supplied
fuse
400
mA
delayed
into
the
fuse
holder
instead
of
the
one
built-in
—
Change
the
mains
voitage
plate
at
the
rear
of
the
instrument
in
accordance
with
the
mains
voltage
selected.
The
plates
for
110
V,
128
V,
238
V
are
inserted
into
a
plastic
cover,
as
the
fuse
just
mentioned.
— Close the instrument
Mains
connection
must
be
made
in
accordance
with
the
local
safety
regulations.
This
implies
that
the
instrument
is
connected
to
mains
socket
with
protective
earth
contact
(see
para.
2.3.).

3.1,
OPERATING INSTRUCTIONS
CONTROLS AND SOCKETS (FIG. 2)
Legend Position
POWER 251
OON
@ OFF
WAVE FORM 253/4 to
we Dei DC 253/9
FREQUENCY Hz 253/10 to
x.1 x1 x10 x100 x1K x10K 253/16
x100K
1...20 648
(Linear scale)
FREQ OFFSET 647
DUTY CYCLE 252/5
DUTY CYCLE 673
ATTENUATION 253/1 to
10dB 20dB 30dB 253/3
AMPLITUDE 821
3 Vpp to 30 Vpp
DC OFFSET 822
—10 V to +10 V
PUSH FOR ZERO 822
OUTPUT 875
TTL OUT 874
600 22/50 2
PEN LIFT 872
SWEEP INPUT 873
SWEEP OUT 871
START FREQ 646
CHECK IN STD BY
13
Function
mains switch;
white dot for ON position
pushbuttons for the required waveform:
sinewave, triangular-, square-wave, positive
or negative square waves, DC without a.c. portion
pushbuttons for selecting the frequency range
0,1 - 2 Hz, 1 Hz - 20 Hz, 10 Hz - 200 Hz,
100 Hz - 2 KHz, 1 KHz - 20 KHz, 10 KHz - 200 KHz,
100 KHz - 2 MHz
dial for continuous coarse frequency adjustment
knob for continuous fine frequency adjustment
pushbutton to switch on the duty cycle adjustment
knob for duty cycle adjustment
pushbuttons for setting the fixed attenuation;
40 dB to 60 dB by combination of pushbuttons
knob for continuous amplitude adjustment of the
output signal.
knob for continuous d.c. voltage adjustment
pull-switch for adding the d.c. voltage to the
output signal.
BNC socket for the output signal
BNC socket for TTL output signal (at the rear side)
pushbutton for selecting the impedance of the main
output.
control signal to control pen writing in case of
plotting. This BNC socket is positioned at the rear
side.
BNC socket at the rear side; input of external sweep
voltage
BNC socket at the rear side; output of the sweep
voltage during internal sweep
knob for adjusting the start-frequency

14
3.2.
3.2.1.
3.2.2.
3.2.3.
TRIG
252/4
pushbutton
for
starting
a
single
sweep
STD
BY
252/3
STD
BY
-
for
adjusting
the
start
frequency
and
for
single
sweep
CONT
CONT
-
continuous
sweep
SWEEP
PERIOD
s
256
range
selector
for
the
sweep
period
PERIOD
601
-
knob
for
adjusting
the
sweep
period
HOLD
252/1
pushbutton
for
stopping
the
sweep
immediately
RESET
252/2
pushbutton
for
resetting
the
sweep
to
f,.,,,-
SWEEP
TRIG
870
BNC
socket
at
the
rear
side
—
to
start
a
sweep
by
INPUT
means
of
an
external
signal.
OPERATION
Setting the voltage at socket OUTPUT
By
means
of
the
control
AMPLITUDE,
the
amplitude
of
the
output
signal
is
continuously
variable.
Released
button
DC
and
pulled
button
PUSH
FOR
ZERO
enables
a
continuously
adjustable
positive
or negative
d.c.
voltage
to
be
added
to the
output
signal.
When
pressing
the
button
DC,
the
a.c.
part
of
the
output
signal
is
switched
off
and
the
d.c.
voltage
only is fed to the output.
With
step
attenuator
ATTENUATION,
the
output
signal
and
the
DC
offset
can
be
attenuated
in
steps
of
10
dB
up
to
60
dB.
For
10
dB
to
30
dB
separate
pushbuttons
are
available.
Attenuations
of
40
and
50
dB
are
selected
by
combined
pushbutton
actions.
For 60 dB all three buttons have to be pressed.
Note:
The
output
amplifier
could
be
overdriven
due
to
adding
signal
and
DC
offset
voltage.
To
avoid
limiting,
the
peak
value
of
the
open-circuit
output
voltage
must
not
exceed
+15
V
(step
attenuator
set
to
0
dB).
Setting the frequency
The PM 5132 offers three control elements for setting the frequency:
— a dial with linear scale
— a range selector FREQUENCY Hz with seven ranges
— vernier FREQ OFFSET control
The
output
frequency
is
represented
by
the
scale
reading
multiplied
by
the
factor
of
the
range
selector
FREQUENCY
Hz.
in
addition
the
frequency
deviation
set
of
the
FREQ
OFFSET
control
must
be
accounted
for.
Setting the wave form
The
required
wave
form
is
selected
by
pressing
the
according
pushbutton
of
the
wave
form
selector.
If
the
duty
cycle
shall
be
set
to
any
value
different
to
50
%,
the
pushbutton
DUTY
CYCLE
must
be
pressed
fo adjusting
the
duty cycle
within
10
%
and
90
%
by
means
of
the knob
DUTY
CYCLE.

3.2.4,
15
Setting the internal sweep
The
internal
sweep
action
of
the
PM
5132
can
be
performed
within
one
subrange.
The
value
of
the
dial
represents
the
stop
frequency,
the
start
frequency
is
set
according
to
the
following
rules:
— pushbutton STD BY / CONT must be set to STD BY
—
range
selector
SWEEP
PERIOD
s
must
be
switched
from
OFF
to
the
required
range
— adjust the sweep period with the knob PERIOD
—
adjust
the
start
frequency
with
knob
START
FREQ.
This
frequency
can
now
be
measured
at
the
socket
OUTPUT.
The
start
frequency
may
be
set
greater
or
less
than
the
stop
frequency,
a
sweep
can
be
performed
in
both
directions
,
up
and
down.
Starting a single sweep is done by pressing the pushbutton TRIG once, the continuous sweep is
realized by setting the pushbutton STD BY / CONT to CONT. In addition to this a sweep action
can be started by a triggering pulse at the SWEEP TRIG INPUT socket. Starting criterion is the
negative edge e.g. of a TTL signal.
The SWEEP OUT socket at the rear side provides the instantaneous sweep voltage corresponding
to a distinct signal frequency for controfling an oscilloscope or x - y plotter. The voltage to frequen-
cy relationship is linear, a sweep-voltage of O V represents f+, 7. 4 sweep voltage of +5 V fstor:
Further control elements for manual controlling are the HOLD pushbutton to stop the sweep imme-
diately and RESET for resetting to fstant during the sweep.
Note: Before executing an internal sweep, disconnect all cables from the SWEEP INPUT socket.
This input is not switched off during an internal sweep.
Utric
SWEEP
TRIG
INPUT
t
f
‘stop
ere fstop™ dial reading . muiltiptied by the
factor of the frequency
eis range selector
9
fstaRT
7
adiustment
of
FREQUENCY
Hz
ht knob
START START FREQ
sweep
range selector SWEEP PERIOD
and knob PERIOD
time
SWEEP
OUT Internal Sweep
Diagram of a sweep period with the sweep
output-voltage SWEEP OUT and the
triggering signal SWEEP TRIG INPUT.

16
3.2.5,
External sweep and frequency modulation
The
signal
frequency
of
the
generator
can
be
controlled
by
connecting
an
external
voltage
to
SWEEP
iNPUT.
In order
to
avoid
superpositions
by
the
internal
sweeps,
switch
the
range
selector
SWEEP
PERIOD
s
to OFF. The
desired
signal
frequency
(=
basic
frequency)
must
then
be
adjusted
by
means
of
the
dial
and
the
range
selector
FREQENCY
Hz.
By
feeding
a
dc
or
ac
voltage
to
the
sweep
oscilla-
tor
via
SWEEP
INPUT,
the
signal
frequency
is
varied
proportional
to
this
voltage
(the
relationship
between
voltage
and
frequency
is
linear).
The
maximum
variation
should
not
exceed
2
1/2
decades,
where
the
upper
limit
of
the
sub-range
is
the
upper
limit
for
the
sweep
range too.
Otherwise
you
would
get
signal
distortions
because
of
overdriving
the
controlled
current
source.
DIAL READING SWEEP VOLTAGE SWEEP FREQUENCY
Uc [VOLT]
20
10
External sweep
Sweep
range
depending
on
the
sweep
voltage
Ue.
Example
for
subrange
V
(1
KHz
-
20
KHz)

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