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11
2.1.3. Position
The
instrument should be used
in
horizontal or
in
sloping position
by
hinging
out
the
tilting
bracket.
Make
sure that
the
ventilation holes
in
bottom- and
top
plate
are
free.
Pay
attention that the
instrument
is
not
positioned
on
objects
which produce
heat
or radiate heat.
2.1.4.
Connection to the mains
The
instrument
must
only
supplied
with
a.c.
voltage.
On
delivery
the instrument
is
set
to
230
V
±
15
%.
If
a
different
mains
voltage
is
required,
proceed
as
follows:
—
Plug
off
the
mains connector
—
Remove
the
bottom
plate after
loosening
both screws
at
the
rear
—
Change
the connections
on
the transformer
in
accordance with
the
diagram annexed
(see Fig. 4)
—
Close the
bottom
plate
and remove
the
top
plate
—
Exchange
the mains-voltage
plate
on
the
rear side
in
accordance with
the
mains
voltage adjusted
—
Close the instrument
2.1.5.
Earthing
The
instrument
must
be
earthed
in
conformity
with the
local
safety regulations.
The
supplied
mains
cable
contains
a protective
conductor which
is
connected
to the earth
contacts of the
plug.
The
instrument
must
be
connected
to
a
mains
socket with
earth contacts.
The
protective earthing of the
instrument
is
only
guaranteed
when
performed
in
this
way.
The
cabinet socket
(_L)
at
the
rear
should
on no
account
be used
to
connect
a
protective
conductor.
The
circuit
earth potential of the
measuring
bridge
is
connected
to the protective
conductor.
2.2.
OPERATION
2.2.1.
Switching
on
the instrument
After the
measuring
bridge has
been connected
to the
mains
in
accordance
to
2.
1
.4., it
may
be switched
on by
depressing
mains
switch
POWER.
The
scale
in
the indicator
should
light
up.
This
means
that the
instrument
is
ready
for
use.
The
white spot
inside
the
POWER
switch
indicates
mechanically
that the
instrument
is
switched
on.
2.2.2.
Measuring
ohmic
resistors
—
Depress
push-button
"R"
—
Connect
the
sample
to
sockets
"l-E"
2.2.2.
1.
Searching the
correct
range
in
case
of
unknown
resistance value
-
Depress push-button
"SEARCH"
—
Switch-over the measuring-ranges
—
The
correct
measuring
range
is
found,
when
the
indicator points to
the
"VW"-field.
—
Pointer deflection
too
large
—
* select a
lower measuring range
—
Pointer deflection
too
small
~
select
a
higher
measuring
range
Note:
In the ranges
0.1 SI
-
1
SI;
1
Si
-
10
Si
and
10
SI
-
100
SI,
the
searching range
is
limited.
If
the pointer
in
range
100
SI
-
1
kSl points
above
the
marked
field
and, switching
over,
the deflection
in
range 10
SI
-
100
SI
becomes
higher
or remains
the
same,
the
resistor
must
be measured
in
one
of
the
lower
ranges.
2.2.2.2.
Measuring
the resistance value for a
known
measuring
range
—
With
the vernier adjust the pointer
deflection to
a
minimum
—
Multiply the
scale
reading
by
the value selected
with
the
range
selector to
obtain
the
exact
resistor
value.
2.2.3.
Measuring
capacitors
—
Depress
push-button
"C"
—
Connect
the
sample
to sockets "l-E"
(casing to
socket E)
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