General Instructions; Dc Voltage Measurement - 3B SCIENTIFIC U17450 Manual Del Usuario

Overload protection:
F3 fuse, 15 H/250 V in accordance
with DIN VDE 0820 Section 22/EN 60
127-2 as circuit protection in the
case of overload; movement protect-
ed by 2 antiparallel-connected di-
odes
Protection class:
IEC 1010-1/EN 61010-1/ VDE 0411-1
Overvoltage category: CAT III
Nominal voltage: 300 V
Degree of pollution: 2
Test voltage: 3.7 kV~
EMV: Electromagnetic compatibility
Jamming: EN 50081-1:1992
Interference
immunity: EN 50082-1:1992
Power supply: 1 x 9 V flat cell bat-
tery, IEC 6F22
Dimensions: 98 x 138 x 35 mm
Weight: approx. 0.3 kg
3. Operation
3.1 Readying for use
• Insert battery into the battery
compartment. To do this remove
the section of housing by pressing
in the nub (6), e.g. using a screw-
driver. Then insert the battery and
connected it to the battery clip.
Replace the housing section and
snap it into place.
• Check the mechanical zero-point.
The measuring instrument may
not be connected at this time. Set
the sliding switch (4) to the "0"
position. The needle must be lo-
cated in the " OFF" position
when the multimeter is in a hori-
zontal position. If necessary make
the corresponding adjustments
with the adjustment screw (5).
• Check the electrical zero-point. Set
the slide switch (4) into the "
position. Select the measurement
range, the needle must be set to
zero-point in the center of the
scale, otherwise correct using the
rotary knob (2).
• Check the battery. To do this set
the slide switch (4) to "
then adjust the rotary switch (1)
to" ". If the needle does not de-
flect into the battery test zone des-
ignated " " the battery must be
replaced.

3.2 General instructions

• When performing measurements
always set the rotary switch (1) to
the highest measurement range.
Then turn the switch to lower rang-
es until you obtain optimum nee-
dle deflection.
• When the power supply is inter-
rupted by the automatic battery
switch-off (after approx. 45 min.)
switch the slide switch (4) on and
off again.
• When the multimeter is not in use,
disconnect all measurement leads
from the meter, reset the rotary
switch (1) to the highest range, set
the slide switch (4) to the "0" set-
ting and, if necessary, remove the
battery.

3.3 DC voltage measurement

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