3B Scientific Analog Multimeter AM51 - Manual (Page 4)

9
• Connect the multimeter and take
a reading from the V, A DC scale.
3.3.3 AC voltage up to 600 V
V A Ω
~
COM
• Using the rotary switch (1) select
the corresponding measurement
range “600,...,10 V AC”.
• Connect the multimeter and take
a reading from the V, A AC scale.
3.4 Current measurement
• When taking any current measure-
ments connect the multimeter in
series to the load in the circuit,
which has the least potential with
respect to ground.
• Measurements conducted in the 3
A range may not take longer than
1 min.
3.4.1 Direct current up to 1 A
_
+
V A Ω COM
• Using the rotary switch (1) select
the corresponding measurement
range “1 A,...,50 µA DC”.
•
Connect the multimeter and take
a reading on the V, A, DC scale.
3.4.2 Alternating current up to 3 A
V A Ω
~
COM
• Using the rotary switch (1) select
the corresponding measurement
range “3 A,...,3 mA AC”.
•
Connect the multimeter and take
a reading on the V, A, AC scale.
3.5 Measuring resistance
_
+
V A Ω COM
• Using the rotary switch (1) select
the corresponding measurement
range “x 100
Ω ,..., x 1 Ω ”.
•
Connect the multimeter and take
a reading on the Ù scale.
• When performing measurement
on semiconductors use the follow-
ing terminals: positive pole con-
nected to “COM” and negative pole
connected “
100mV
50 µ A A, Ω ”.
•
Resistance measurement is carried
out using the DC voltage from the
battery being used. Since the bat-
tery is under extreme loading dur-
ing measurements in the “x 1
Ω ”
range, the measurement should
only be of a brief duration.
•
Only measure zero-voltage ele-
ments due to the fact that exter-
nal voltages falsify measured val-
ues.
• When resistances measurements
are carried out involving longer
periods and switchover to other
measurement ranges is complete
check for 0
Ω
full scale deflection
and adjust, if necessary.