Philips PM 5132 User manual

Function
generator
O1HZ-2MHz
-
PM
5132
Instruction
manual
-—
Geratehandbuch
—
Mode
demploi
et
d’entretien
9499
453
00202
88 0401/6

Function generator 01HZ-2MHz
PM 5132
9445 051 32001
Instruction manual
Geratehandbuch
Mode d’emploi et d’entretien
9499 453 00202
88 0401/6
PHILIPS
PHILIPS

Please note
In
correspondence
concerning
this
instrument,
please
quote
the
type
number
and
serial
number
as
given
on
the
type
plate.
Bitte beachten
Bei
Schriftwechsel
ber
dieses
Gerat
wird
gebeten,
die
Typennummer
und
die
Geratenummer
anzugeben.
Diese
befinden
sich
auf
dem
Typenschild
an
der
Riickseite
des
Gerates.
Noter s. v. p.
Dans
votre
correspondance
et
dans
vos
réclamations
se
rapportant
a
cet
appareil,
veuillez
toujours
indiquer
le
numéro
de
type
et
le
numéro
de
série
qui
sont
marqués
sur
la
plaquette
de
caractéristiques.
Important
As the instrument is an electrical apparatus, it may be operated only by trained personnel. Maintenance and repairs
may also be carried out only by qualified personnel.
Wichtig
Da das Gerat ein elektrisches Betriebsmitte! ist, darf die Bedienung nur durch eingewiesenes Personal erfolgen.
Wartung und Reparatur diirfen nur von geschultem, fach- und sachkundigem Personal durchgefiihrt werden.
Important
Comme I'instrument est un équipement électrique, le service doit @tre assuré par du personnel qualifié. De méme,
l’entretien et les réparations sont a confier aux personnes suffisamment qualifiées.
(c) Philips GmbH — Hamburg — Germany — 1988 Ang
All rights are strictly reserved.
Reproduction or divulgation in any form whatsoever is not permitted without written authority from the copyright owner.
Issued by Philips GmbH -Unternehmensbereich Elektronik fiir Wissenschaft und Industrie- Werk fiir MeBtechnik
Printed in Germany

CONTENTS
1.1.
1.2.
1.3.
1.4,
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
3.1.
3.2.
4.1.
4.2.
4.3.
4.4.
4.5.
GENERAL
Introduction
Technical data
Accessories
Operating principle
INSTALLATION INSTRUCTIONS
Initial inspection
Safety instructions
Mains voltage setting and fuses
Operating
position
of
the
instrument
Dismantling the instrument
Radio interference suppression
OPERATING INSTRUCTIONS
Controls and sockets
Operation
SERVICE PART
Circuit description
Access to parts
Check and adjustment
Safety
inspection
and
tests
after
repair
and
maintenance
Spare
parts
FIGURES
. Block diagram
. Front view
. Rear view
. Unit 2, component lay -out
. Front view, mechanical parts
. Bottom view
. Unit 1, component lay -out
. Overall circuit diagram
an oothWRrn —
CODING
SYSTEM
OF
FAILURE
REPORTING
FOR
QUALITY
ADDRESSES FOR SALES AND SERVICE
oo oo ol
11
11
11
12
12
12
12
13
13
14
41
41
45
46
49
49

INHALTSVERZEICHNIS
1.1.
1.2.
1.3.
1.4.
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
3.1.
3.2.
ALLGEMEINES
Einleitung
Technische Daten
Zubehor
Funktionsprinzip
VORBEREITUNGSANWEISUNGEN
Wareneingangskontrolle
Sicherheitsanweisungen
Netzspannungseinstellung
und Sicherungen
Betriebslage des Gerdates
Offnen des Gehauses
Funkentst6rung
BETRIEBSANLEITUNG
Bedienelemente und Anschlisse
Bedienung
BILDVERZEICHNIS
1 Blockschaltbild
2 Frontansicht
3 Riickansicht
17
17
7
21
22
23
23
23
24
24
24
24
25
25
26
TABLE DES MATIERES
1.1.
1.2.
1.3.
1.4.
2.1.
2.2.
2.3.
24.
2.5.
2.6.
3.1,
3.2.
GENERALITIES
introduction
Caractéristiques techniques
Accessoires
Principe de fonctionnement
29
29
29
33
33
INSTRUCTIONS POUR L’INSTALLATION 35
Inspéction initiale
Consignes de sécurité
Adaptation a la tension secteur, fusibles
Position de fonctionnement de |'appareil
Démontage de |’appareil
Suppression du rayonnement
MISE EN SERVICE
Commandes et douilles
Fonctionnement
RAPPEL DES FIGURES
1 Schéma synoptique
2 Face avant
3 Face arriére
35
35
35
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
general
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
continuously
adjustable
d.c.
output
voltage
can
be
selected
separately
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
of
a
pushbutton
between
50
2
and
600
22.
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 separate output is available.
The
ergonomic
design
of
controls
and
sockets
serves
for
convenient
operating
of
the
instrument.
TECHNICAL DATA
Safety characteristics
This
apparatus
has
been
designed
and
tested
in
accordance
with
Safety
Class
|
requirements
of
IEC
Publication
348,
Safety
Requirements
for
Electronic
Measuring
Apparatus,
and
has
been
supplied
in
a
safe
condition.
This
manual
contains:
some
information
and
warnings
which
must
be
fo!lowed
by
the
user
to
ensure
safe
operation
and
to
retain
the
apparatus
in
a
safe
condition.
Performance characteristics, specifications
Properties
expressed
in
numerical
values
with
stated
tolerance
are
guaranteed
by
the
manufacturer.
Specified
non-tolerance
numerical
values
indicate
those
that
could
be
nominally
expected
from
the
mean
of
a
range
of
identical
instruments.
This
specification
is
valid after
the
instrument
has
warmed
up
for
30
minutes
(reference
temperature
23
°C).
If
not
stated
otherwise,
relative
or
absolute
tolerances
relate
to
the
set
value.
Frequency
Frequency
range
0.1
Hz
-
2MHz
Selected
range
|
0.1
Hz
-
2
Hz
if 1 Hz - 20 Hz
Wl 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
— dial with linear scale
— kriob for fine-adjustment
— linear scale on the dial
+2 % of dial setting +0,2 % of full scale
+5 % of the dial setting
<0,1 %/K_ ranges II - VI
<0,15 %/K ranges | - VII
<0.10 % ranges! - VI
<0.50% range VII
<0.25 % ranges | - VI
<1.50% range VII
\ within 15 min
\ within 7 hours
BNC socket
50 22/600 22, selected by pushbutton
short-circuit proof
~~ sinewave
/V triangular wave
TLy squarewave
TL positive pulse
ur— negative pulse
DC d.c. voltage without a.c.
adjustable from 10 % to 90 % when pushbutton
DUTY CYCLE is pressed (restricted use in range VII)
3 Vpp to 30 Vpp, continuously adjustable
1,5 Vpp to 15 Vpp for pulses
+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 % in range VI
<3 %inrange VII
> 99%

1.2.3.
1.2.4.
1.2.4.1,
risetime, falltime
(squarewave)
overshoot and ringing
(squarewave)
Amplitude response
(sinewave, reference
value = 1k Hz;)
TTL-output
Connection
_ Duty cycle, frequency
Fan out
Frequency control
Internal sweep
Sweep modes
Sweep characteristic
Start frequency
Stop frequency
Sweep period
Sweep contro} elements
<75ns
(at
max.
amplitude,
load
50
22)
<2% (at max. amplitude, load 50 2)
<0.1 dB in ranges | to V
< 0:3 dB up to 1 MHz
<1 dBinranges | to VII
(at max. amplitude,load 50 Q,
attenuation 0 dB).
BNC socket at the rear side
identical with main output
20 TTL inputs
— single sweep started by a pulse (SWEEP TRIG
INPUT)
—
single
sweep
started
by
pressing
the
pushbutton
TRIG
— continuous sweep
single sweep
——— continuous sweep
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:
—50ms tots
—0,5 sto10s
—5 sto 100s
— pushbutton to start a single sweep
— pushbutton to stop the running sweep immediately
— pushbutton for resetting to f luring single sweep.
STAR

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
>10kQ2
t1i5V
negative going edge of a pulse (from High to Low);
e.g. TTL signal with slew rate > 0.5 V/ms
BNC socket at the rear side
10kQ
OVto5V (¢ )
START’ "' stop
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 We delones
output voltage: +22 ey electronic switch
kQ,
internal resistance: 100 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
— frequency range of operation
— Power consumption
BNC socket
linear
47kQ
2 1/2 decades
15 kHz
1V/0,2 f where f represents the upper limit
max. max
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
47,5 — 105 Hz
25 W

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
transportation
Relative humidity
— Reference range
— Nominal operating range
— Limits for storage and transportation
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
— depth
Weight
ACCESSORIES
Standard
Optional
423°C #1°C
+ 5° Cto+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 2200 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 and voltage labels
PM 9585: 50 2 termination 1 W
PM 9581: 50 2 termination 3 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.
contro!
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 1:9 and 9 : 1 when push-
button DUTY CYCLE is pressed.
The output current of the controlled current source depends on the positions of the frequency dia!
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,
a
continous
sweep
is
started
by
setting
the
pushbutton
STD
BY/CONT
to
position
CONT.
Starting
a
single
sweep
can
be
done
by
pressing
the
pushbutton
TRIG.
Moreover
it
is
possible
to
start
a
single
sweep
by
means
of
an
external
trigger
pulse
connected
to
the
SWEEP
TRIG
INPUT
socket.
The sweep range is adjustable by means of the knob START FREQ 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 SWEEPOUTare 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 Fstop . 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 interna! resistance
can be switched to 600 2 or to 50 £2.
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.
2.2.
2.2.1.
2.2.2,
2.2.3.
INSTALLATION INSTRUCTIONS
INITIAL INSPECTION
Check
the
contents
of
the
shipment
for
completeness
and
note
whether
any
damage
has
occurred
during
transport.
If
the
contents
are
incomplete,
or
there
is
damage,
a
claim
should
be
filed
with
the
carrier
immediately,
and
the
Philips
Sales
or
Service
organisation
should
be
notified
in
order
to
facilitate
the
repair
or
replacement
of
the
instrument.
SAFETY INSTRUCTIONS
Upon
delivery
from
the
factory
the
instrument
complies
with
the
required
safety
regulations,
see
para.
1.2.
To
maintain
this
condition
and
to
ensure
safe
operation,
the
instructions
below
must
carefully
be
followed.
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
of
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
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.
Earthing (grounding)
Before
any
other
connection
is
made
the
instrument
shall
be
connected
to
a
protective
earth
conductor
via
the
three-core
mains
cable.
The
mains
plug
shall
be
inserted
only
into
a
socket
outlet
provided
with
a
protective
earth
contact.
The
protective
action
shall
not
be
negated
by
the
use
of
an
extension
cord
without protective
conductor.
The external contacts of the BNC sockets musi not be used to connect a protective conductor.
WARNING:
Any
interruption
of
the
protective
conductor
inside
or
outside
the
instrument,
or
dis-
connection of the protective earth terminal, is likely to make the instrument dange-
rous. Intentional interruption is prohibited.
The
circuit
earth
potential
applied
to
the
external
contacts
of
the
BNC
sockets
is
connected
to
the
cabinet.
The
external
contacts
of
the
BNC
sockets
must
not
be
used
to
connect
a
protective
conductor.
Connections
The circuit earth potential is applied to the external contacts of the BNC sockets and is connected to
the cabinet by means of parallel-connected capacitor and resistor. By this means hum loops are avoided
and a clear HF earthing is obtained.
lf the circuit earth potential in a measurement set-up is different from the protective earth potential,
it must be noticed,
— that the BNC sockets can be touched and that it must not be live, see the safety regulations on the
subject (VDE 0411),
— that all sockets marked with the sign L are internally interconnected.
11

12
2.2.4.
2.3.
2.4,
2.5.
2.6.
Mains voltage setting and fuses
Before
inserting
the
mains
plug
into
the
mains
socket,
make
sure
that
the
instrument
is
set
to
the
local
mains voltage.
The
instrument
shall
be
set
to
the
local
mains
voltage
only
by
a
qualified
person
who
is
aware
of
the
hazard involved.
WARNING:
|
If
the
mains
plug
has
to
be
adapted
to
the
local
situation,
such
adaption
should
be
done
by a qualified person only.
Make
sure
that
only
fuses
of
the
required
current
rating,
and
of
the
specified
type,
are
used
for
rene-
wal.
The
use
of
repaired
fuses,
and/or
the
short-circuiting
of
fuse
holders,
are
prohibited.
The
fuse
shall
be
renewed
only
by
a
qualified
person
who
is
aware
of
the
hazard
involved.
WARNING:
The
instrument
shall
be
disconnected
from
all
voltage
sources
when
a
fuse
is
to
be
rene-
wed,
or
when
the
instrument
is
to
be
adapted
to
a
different
mains
voltage.
MAINS VOLTAGE SETTING AND FUSES
The safety instructions in chapter 2.2.4. must be followed.
On delivery from the factory the instrument is set to 220 V (PM 5132) resp. 110 V (PM 5132.M).
If the instrument is to be used on a different supply voltage proceed as follows:
— 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
— Dismantle the cabinet
—
Change
the
solder
links
according to the connection diagram
—
If
necessary
exchange
the
supplied
fuse
and
mains
voltage
label
—
Close
the
instrument
OPERATING POSITION OF THE INSTRUMENT
The instrument may be used in the positions indicated in clause1.2. 6.With the handle folded down, the
instrument may be used in a sloping position; for this push the buttons of the handle. The characteristics
mentioned in Section 1.2. are guaranteed for the specified positions.
Ensure that the ventilation holes in the cover are free of obstruction.
Do not position the instrument on any surface which produces or radiates heat, or in direct sunlight.
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
— Dismantle the cabinet
RADIO INTERFERENCE SUPPRESSION
Radio
interference
of
the
instrument
is
suppressed
and
checked
carefully.
In
connection
with
deficient
suppressed
base
units
and
further
units
radio
interference
can
be
generated,
which
have
to
be
suppressed
by
means
of
additional
activities.

3.1.
OPERATING INSTRUCTIONS
CONTROLS AND SOCKETS (FIG. 2, 3)
Legend Position
POWER 251
OON
© OFF
WAVE FORM 253/9 to
MY De eDC 253/4
FREQUENCY Hz 253/16 to
x.1 x1 x10 x100 x1K x10K 253/10
x100K
1...20 648
(Linear scale)
FREQ OFFSET 647
DUTY CYCLE 252/5
DUTY CYCLE 673
ATTENUATION 253/3 to
10 dB 20dB 30dB 253/1
AMPLITUDE 821
3 Vpp to 30 Vpp
DC OFFSET 822
-—10 Vtot+10V
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
pulses,
DC
without
ac
portion
pushbuttons for selecting the frequency range
0,1 -2 Hz, 1 Hz - 20 Hz, 10 Hz - 200 Hz,
100 Hz - 2k Hz, 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 switching in the d.c. voltage
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 for pen writing in case of
plotting (BNC socket 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
during
single
sweep
to
fe...
a7:
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
contro!
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.
By
means
of
the
pushbutton
600
22/50
2
the
internal
resistance
can
be
switched
to
600
{2
or
50
Q.
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 range selector FREQUENCY Hz with seven ranges
— a dial with linear scale
—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.
lf 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.
At the TTL OUT socket a TTL signal is available, the frequency and duty cycle of which correspond to
the signal at the OUTPUT socket.

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
position
STD
BY
a
single
sweep
can
be
started
by
a
triggering
pulse
at
the
SWEEP
TRIG
INPUT
socket.
Starting
criterion
is
a
negative
going
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 controlling an oscilloscope or x - y plotter. The voltage to frequen-
cy
relationship
is
linear,
a
sweep-voltage
of
O
V
represents
fstaART’
a
sweep
voltage
of
+5
V
fstop:
Further contro! elements for manual controlling are the HOLD pushbutton to stop the sweep imme-
diately and RESET for resetting to fora rr during single 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.
Urric
SWEEP
TRIG
INPUT
t
f
i = dial reading multiplied by the
factor of the frequency
range selector
= adjustment of FREQUENCY Hz
knob
START FREQ
‘sta RT
range selector SWEEP PERIOD
and knob PERIOD
time
SWEEP
OUT
Internal
Sweep
: Diagram of a sweep period with the sweep
a
ile
es
as
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 de 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
Ug [VOLT]
20
10
External sweep
Sweep
range
depending
on
the
sweep
voltage
Uc.
Example
for
subrange
V
(1
KHz
-
20
KHz)

Service part