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)
To Next Page
Loading...
