Measuring AC and DC current
7
WAR NING: To avoid damage to t he meter or
injury if the fuse bl ows, never attempt an
in-circuit curr ent measurement where t he
open-circuit po tential to earth (groun d) is
greater than 250V.
The DC current range is 400uA, 4.000mA,
40.00mA, and 400.0mA .The AC current
range is 400uA, 4.000mA, 40.00mA,
and 400.0mA.
NOTE: Connect the m easuring current of
the meter in series , not connected in
parallel. This pr events damage to the
meter or endanger ing personal safety.
C ut off the power of the measured circuit.
D ischarge all high voltage capacitance on
t he measured circuit.
Turn the rotary switch to the mA or uA
p osition (1). When the measured current
i s less than 400uA, select the uA position.
W hen the measured current is
4 mA~400mA, select the mA position.
D isconnect the circuit under test. Connect
t he black test lead to the end of dis
c onnected circuit under test (with lower
v oltage). Connect the red test lead to the
o ther end of the disconnected circuit
u nder test (with higher voltage).
S witch on the power of t
he circuit, and then
r ead the reading displayed on the LCD. If the
d isplay only displays “OL”, it indicates that
t he input exceeds the selected range. Move
t he rotary dial to a higher range.
C ut off the power to the measured circuit.
D ischarge all capacitances, take off the
t est leads and recover the circuit.
When measuring DC c urrent, if the test
leads are reverse ly connected to the
circuit , the displ ay will change into
negative, but not a ffect measuring
accuracy.
1716
Operation (continued)
Measuring capacitance
Operation (continued)
5
CAUTION: To avoi d the meter or measured
equipment from be ing damaged, cut off all
power supply of mea sured circuits and
discharge all hig h voltage capacitors be fore
on/off measurem ent.
The capacitance ranges of the meter are
4.000nF, 40.00nF, 400.0nF, 4.000uF,
40.00uF, 100.0uF.
Turn the rotary switch to the
p osition (1).
P ress the FUNC key (2) and select the
C AP measuring range.
Apply the two ends of the test leads to
m easure the two pins of the capacitance
u nder test and read the measured value
o n the LCD.
NOTE: The meter wil l take some time to
stabilize the rea ding when the capacitan ce
is high. A small capa citance with less than
10nF subtracts fr om the distribution
capacitance of th e meter and lead ( namely
displayed base nu mber) when measuring.
Measuring frequency and duty cycle
6
Turn the rotary switch to the
p osition (1).
P ress the Hz% key (2). For frequency,
s elect the Hz range. For duty cycle,
s elect the % range.
Apply the two ends of the test leads to
m easure the frequency or duty cycle
v alue of the circuit under test.
R ead the value that displays on the LCD.
