Sinclair PDM 35 User manual
Defective instruments should
be
returned
carriage paid to
the
Multimeter Service Dept.
Sinclair Radionics
Ltd.
Careful packing is
essential -retain
the
original packing material.
If
the
guarantee has expired
or
if
the
fault is
the
result
of
misuse, the repair will be carried
out
and charged unless other instructions are
received. '
Customers outside
the
UK
should contact
the
dealer from whom
the
rn<:"•
was purchased to
ascertain service
arr
:ments for
that
country.
Sinclair Radionics
Ltd.
London
Road, St. 1ves, Huntingdon
Cambs., PE17
4HJ
Tel:
St. Ives (0480) 64646
Sinclair Radionics
lnc.
Galleria,
115
East 57th Street
New
York, N.Y. 10022 USA.
Tel:
(212) 355 5005
l • 1 •
5nt::alr-
PDM
35
Digital Multimeter
OWNER'S MANUAL
The
Sinclair
PDM35
is a very compact
portable digital multimeter which combines
high performance with ease
of
operation.
.
High
accuracy, high resolution
and
high
im-
pedence are combined with
the
precision
of
a
digital readout.
The
instrument will measure ACl.f) and
DC
= voltage,
DC
= current and re-
sistance
on
an
LED
display reading
up
to ±
1999. Operation is via
a·
standard 9 volt
battery and a socket is provided for
the
,connection
of
a Sinclair
AC
adaptor when
required.
Part
No
58121 -o6o
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1
Power
Consumption
9V, 35mA-battery
9V, 45mA-AC adaptor
Size
6.2" x 3" x 1.25"
157mm x
76mm
x 32mm
Weight
5!
oz (excluding battery)
150 gms.
Preparing
for
Operation
The
instrument
must
be fitted with a 9-volt
battery
of
the rectangular
or
PP3 type. A good
quality battery should be used,
and
a high
power
or
Alkaline version chosen where
possible.
The
battery is located beneath a snap-on
cover
at
the
back.
Lift
up
the
back
of
the
cover
with a finger naïl
and
press
in
the
direction
of
the arrow
to
remove it. Slide
it
on
until
it
clicks home
to
replace.
Alternatively,
the
instrument
may be powered
from
an
AC
adaptor
of
an
approved type (see
later note) by plugging
it
into the socket
on
the back.
AC Adaptor
socket-
connectapprovedadaptor
torun
from
II7V,
220V
or
240V power.
Function Switch -set
to
mAjV
for current
and
voltage measure-
ments, set
to
n for
resistance measurement.
Range Switch -set
to
the desired range
of
voltage, current
or
resistance as written
above
or
below the knob.
3
MAKING
MEASUREMENTS
=
DC
voltage:
Four
ranges are available each
with
an
input
impedance
of
IO
Mn.
On
the
XI
range a small
zero offset
may
occur from
minute
leakage
currents.
This
will disappear
when
the
leads
are shorted together
and
will
not
affect
the
reading once a voltage is connected.
If
a-
sign appears
in
the
display
the
voltage is
negative
with
respect
to
the
common
lead.
CAUTION
-do
not
apply more
than
1000
volts.
AC
Voltage
AC
voltage is
only
available
on
the
X Iooo V
range.
The
input
impedance is
450Kn.
The
meter
senses
the
mean
value
of
an
input
and
is calibrated
to
read
the
R.M.S.
value
of
a
sine wave.
Any
DC
=
on
the
input
in
addition
to
the
AC
lf)
will affect
the
reading.
CAUTION
-do
not
apply more
than
500
volts
R.M.S.
=DeCurrent
6 ranges are available each
with
a voltage drop
of
Im
V
per
count. Ail ranges are available via
the
mA-n
socket
and
the
multiplier for each
fLA
range is
written
in
the
grey blocks above
the
DCV
ranges.
A leakage
current
of
up
to
±InA
may
be
present
in
the
meter
which would cause
an
error
on
the
xO.rnA
range.
The
offset
must
be
added
to
or
subtracted from
the
reading.
CAUTION-
a
current
is measured
by
making
it
flow
through
the
meter
(by breaking
the
6
l
1
)
J
circuit
and
re-connecting
it
via
the
test leads).
Connecting
the
current
function directly across
a voltage source could result
in
permanent
damage.
NOTE
-
AC
current
cannot be measured
directly
with
this instrument.
Resistance
5 ranges
of
resistance are available each
generating a voltage across
the
unknown resis-
tor
of
+
Im
V
per
count
relative
to
the
common
lead.
If
the
resistor is
in
place across a semi-
conductor junction,
it
may
be necessary
to
reverse
the
leads
to
avoid forward biasing
the
junction.
CAUTION
-Ail
power
must
be removed
from a circuit before trying
to
measure
resistances.
Testing
of
Semi-conductor
Junctions
The
instrument
measures resistance
by
forcing
a known constant
current
through
the
resistor
and
measuring
the
voltage developed.
The
re-
sistance ranges can be used
to
measure
the
forward voltage
drop
of
semi-conductor
junctions,
and
to
match
VBEs
of
transistors etc.
The
current
used
on
each range is as given
in
the
grey blocks at
the
top
of
the
range
information,
and
the
reading
on
the
display
is
the
forward voltage
drop
in
volts.
The
mA-n
socket is
the
positive terminal
of
the
current
source.
Overload
With
the
exception
of
the
x IoooV
DC
=
and
ACV) ranges, ail ranges
can
be
used
up
to
7
a displayed value ± 1999.
When
this is cx-
ceeded
the
display will show = ooo
or
===ooo,
and
the
next highest range should be sclected.
Positive overload always gives fiashing bars. A
small negative overload will also give fiashing
bars (with negative symbol),
but
a larger one
will give fixed bars.
Remember,
when
switched
to
resistance
the
display will show flashing overload until a
resistor lower
than
the
maximum reading
of
the
range is connected. Should fixed bars
appear
on
the resistance function, connecting a
resistor will restore normal operation -this is
not
a fault condition.
To
avoid damage:
A.
Never connect more
than
1000 volts to
the
DCV
= socket,
or
more
than
soo
volts R.M.S.
to
the
ACV
Vl
socket.
B. Never connect a voltage source directly
to
the
mA -nsocket.
C. Never connect
an
input
greater
than
the
maximum permissible overload (see
the
specification).
Selecting
a
Power
Source
The
meter operates from a standard 9-volt
battery.
If
possible a high power
or
Alkaline
type should be used -ask your dealer
if
in
doubt.
To
obtain long battery life the
meter
must
be
switched off whenever measurements are
not
beingmade.
The
condition
of
the
battery may be checked
as follows: Select x 10VDC
=and
connect
8
the
red
test
lead to the
DCV
socket. Remove
the
battery cover, switch
the
instrument
on
and
touch
the test lead
onto
the
negative
battery terminal.
With
a
new
battery
the
reading should be about - 3 volts;
if
it
is close
to
zero
or
is positive
the
battery should be
replaced.
CAUTION
-Never leave a weak
or
dead
battery
in
the
instrument. Even 'leakproof'
types can leak chemicals
that
may
cause
permanent damage
to
the
instrument
-this
will void the guarantee.
When
continuous operation is required
the
meter can be operated from AC power via
an
optional AC adaptor. Plugging this
into
the
socket
on
the
back automatically disconnects
the
internai battery
and
increases
the
display
brightness.
For
safety reasons only
an
approved adaptor
may be
used;
use
of
any
other
will void
the
guarantee.
In
sorne countries
the
correct
Sinclair adaptor may
not
be
available
in
which
case
the
dealer will supply
an
alternative
approved unit.
Sat"ety
Precaution
This
instrument
has
been
designed
to
the
highest safety standards,
but
safe operation
depends
on
the
user so we recommend
the
following rules.
1.
Never connect a voltage
to
the
instrument
which causes the common terminal
to
be
raised
more
than
1000 volts
DC
or
700
volts
AC
RMS
above
earth
ground.
2.
Never
use anything
but
an
approved AC
adaptor
to
power
the
instrument.
9
3. Use extreme caution when working
with
voltages above
IOoV.
Always disconnect
power from
the
circuit being tested whilst
connecting
or
disconnecting test Ieads.
4· Never unplug a test lead from
the
instru-
ment
while
it
is still connected
to
a high
voltage.
s.
Use extreme caution
when
working
with
AC-DC
sets
with
live
or
hot
chassis.
6. Always ensure
that
a workbench is
dean,
dry
and
covered
in
non-conductive
material.
Calibration
The
Sinclair
PDM35
cornes
to
you fully
calibrated
and
tested.
Under
normal use
no
further adjustment shouldbe necessary.
Re-calibration should only be undertaken by
trained engineers with access
to
specialised
equipment,
and
interference
by
unauthorised
persons will void
the
guarantee.
Where owners wish
to
undertake re-calibra-
tion
or
service
of
the
meter
themselves, this
should be done only
in
conjunction with
the
Service
Manual
which may
be
purchased
either directly from Sinclair Radionics
or
their
agents overseas.
Guarantee
The
Multimeter
is guaranteed against defects
arising
in
normal use for a period
of
one year
from
the
date
of
purchase provided
that
the
fault has
not
been
caused
by
any type.
of
misuse.
This
guarantee is offered as
an
extra benefit
and
does
not
affect consumers' statutoryrights.
IO
'
Le
manuel relevant
de
votre
appareil
de
mesure
numérique
est
rédigé
en
langue anglaise; la
présente
notice
doit
être
utilisée
en
conjonction
avec le manuel
et
fournit
une
traduction
des
données
essentielles.
Retirez
donc
la
notice
et
la
coller
dans
votre
manuel
afin
de
ne pas l'égarer.
Generalites
L'appareil
de
mesure
numérique
assure
une
haute
précision, résolution
et
impédance
d'entrée
au
sein
d'un
coffret
de
paume
et
une
lecture
numérique
précise. Vous serez à
même
de
mesurer
la
tension
CA
(ACV),
la
tension
CC
(DCV)
et
la
résistance
(Resistance
Q)
sur un affichage à
diode
à lueurs
sur
une
gamme
jusqu'à
1999
à
polarité
automatique
et
indication
de
surcharge.
Une pile
standard
de
9 volt
est
requise; utiliser
sinon
un
adaptateur
CA
de
9 volt.
Specifications
Les spécifications
de
l'appareil
de
mesure
sont
mentionnées
en page 2. De gauche à
droite
elles
mentionnent
les
fonctions,
la
gamme,
la
précision
de
lecture,
la
résolution,
l'impédance
d'entrée
et
la
surcharge maximale admise.
Sources
d'alimentation
L'appareil
de
mesure
fonctionne
à
partir
d'une
pile
ou accu
de
9 volt
monté
sous
un
couvercle à
glissières au dos. Utiliser
une
pile ou
un
accu alcalin
ou
de
forte
puissance
si
possible
et
ne pas
oublier
de
débrancher
à
moins
de
faire
une
mesure afin
de
conserver
la
longévité
de
la pile.
Sinon,
exploiter
l'appareil à
partit
d'une
source
CA
en
utilisant
un
adaptateur
homologué
de
9 volt -se référer à
votre
concessionnaire. Vérifier
l'étatde
la pile
en
choisissant
x
10
DCV
et
en
mettant
le fil
de
test
rouge
en
contact
avec la
borne
négative
de
la pile.
La
lecture
doit
être
d'environ
-3V,
si
elle affiche
presque
zéro
ou
une
lecture positive, installer
une
pile neuve.
Ne
jamais
laisser
une
pile faible
ou
usée dans l'appareil, elle
fuira
et
peut
causer
des
avaries.
Utilisation
de
l'appareil
de
mesure
L'appareil
est
brancé
en
passant
le
commutateur
au
dos
à la
droite.
Une
fonction
donnée
ainsi
qu'une
gamme
voulue
est
choisie
par
une
combinaison
des
commutateurs
à vernier
de
petite
et
de
grande
taille.
Le
fil noir
doit
être relié à
la
prise
COMMON
et
le
fil
rouge soit à
la
prise
DCV,
ACV
ou
mA-n
selon les
paramétres visés. (Voir page 4).
La
lecture présente
une décimale fixe,
de
ce
fait
il
y a lieu
de
multiplier
l'affichage par le chiffre voisin
du
commutateur
afin
d'obtenir
la
lecture réelle voulue. Ainsi, pour
la
gamme x 10 DCV, un affichage de .987 produit
0,987 x
10
= 9,87 Volt.
La
Surcharge
Vous êtes à même d'utiliser jusqu'à ± 1999 de
la
valeur affichée, exception faite
de
la
gamme x 1000
DCV
et
la
gamme ACV. Lorsque vous dépassez ±
1999, l'affichage sera =000 ou
=000
(utiliser
la
gamme plus élevée suivante
si
possible).
Afin d'éviter une avarie éventuelle:
(a)
Ne
jamais passer plus de 1000 volt
CC
à
la
prise
DCV
ni
500
volt eff. à
la
prise ACV.
(b)
Ne
jamais relier une source
de
tension à
la
prise
mA-n.
(c)
Ne
jamais alimenter plus de
la
surcharge
maximale à une entrée
d'une
gamme quelconque,
selon les directives en page 2.
Etalonnage
Cet appareil
de
mesure vous parvient parfaitement
étalonné
et
ne devrait nécessiter aucune mise au point
supplémentaire pour l'utilisation normale. L'entretien
ou les interventions
de
service par un personnel non·
autorisé annule
la
garantie.
Fonctions supplementaires
Les
gammes
de
résistance peuvent être utilisées pour
la
mesure des chutes
de
tension
de
semiconducteur
dans
le
sens conducteur,
le
courant
de
mesure pour
chaque gamme
étant
mentionné en page 2.
Quatre gammes
de
courant
continu supplémentaires
sont également disponibles en utilisant
la
prise
mA-n
et
les
gammes
DCV.
Multiplier
la
valeur
de
gamme par 0,1
JJ.A
pour obtenir chaque gamme de
courant.
Ces
gammes très faibles
sont
très utiles
po1,1r
la
mesure des fuites, transistor Betc.
II
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