DC
CURRENT
MEASUREMENTS
WARNING: DO
NOT
APPLY VOLTAGE TO
MEASURING TERMI-
NAL
WHILE RANGE
SWITCH IS IN
CURRENT
POSITION.
1
.
Plug the
test
leads into the correct jacks (black into
0
COM and red
into ©V-n-A).
2. Set the range
switch to the
500m DC
A position (500
milliamp).
Or, if
the current will be
greater than 500mA, use the
©
DC 10A jack
(in-
stead
of the
©
V-S2-A)
and set the range
to 10A.
Always start at the
top and work
down.
3. Open
up
the circuit in which you want to
measure
current and connect
the black lead to the negative side and the
red lead
to
the
positive
side
of
the circuit.
4. Apply power to the
circuit
under test.
Set the range and the range doubler
switches
as
required
to obtain a
meter reading in the upper
1/2
or
1
/3rd of the scale.
5.
Read the current on the black DC scales. If the range doubler switch is
in the V-A/2 position, be sure to divide the range
switch
setting
by
2
and read the appropriate scale.
Notes: Do not
attempt to
read AC current.
For currents above 500
milliamps, use
the
10A
range switch
setting and the
©
DC 10A
jack (in-
stead of the ©V-H-A
jack). Use the appropriate setting
of the range dou-
bler switch.
DECIBEL
MEASUREMENTS
1 .
Plug the test
leads into
the correct jacks (black into
©
COM
and red
into ©V-ft-A).
2.
Set the range and the
range
doubler switches as
required
to obtain a
meter reading
in the
upper
1/2
of the scale.
3. Read dB
on the dB scale, adding the
appropriate number of
dB to the
dB
scale reading as noted on the
chart
at
the lower right
on the
meter
face.
Note:
For
absolute dB
measurements, circuit
impedance must be
600
ohms. 0 dB
=
1 milliwatt
dissipated
in a 600
ohm impedance
(equivalent
to 0.775
volts across
600
ohms).
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