T A K I N G M E A S U R E M E N T S
4
FUNCTION
MATH
DISPLAY
DC I
AC I
Ω
4W
Period
dB
dBm
DC V
AC V
Ω
2W
Freq
Cont
Null
Min/Max
HI
HI
LO
LO
I
V
Ω
Ω
4W Sense
Shift
First Shift, then Select
AC or DC
AC or DC Current
-
+
Figure 5
. Probe/Meter Placement to
Measure Current Through Meter
+
A
Circuit
Under Test
DMM
_
I
How to Measure DC and AC
Current
To use the DMM as an ammeter, connect the leads in which the current flows to the current
(
I
) and
LO
terminals (Figure 4). To measure the current, either the
DC I
or
AC I
key must be
selected by pushing
SHIFT
and
DC V
or
AC V
button.
Next, connect the leads of the probes to the
circuit in series with the location of the
current in question (Figure 5). The current
(
I
) lead connects to the “+” (pos) part of
the circuit and the
Lo
to the “–“ (neg). If
these are reversed, a negative value for the
current is obtained.
CAUTION
:
Do not exceed the maximum allowable current input
(3A DC). Never apply a voltage over the current input terminal
(I)
of
the DMM. This will cause a large current to flow through the small
input resistor r
i
and can damage the DMM.
Figure 4
. How to Measure Current