temperature goes down for 10
℃
(18
o
F). For example, when 10M
Ω
impedance
at 40
℃
is converted into the impedance at 20
℃
, its value is 40M
Ω
. The
conductor temperature can be measured with a non-contact infrared temperature
tester
4,
Work safety
To guarantee safety is responsibility of every body. However, your safety is at
your own hands. No tool can guarantee your safety. Only safe equipment and
safe work habit can provide you with the safest protection. The followings are
some safety tips you should obey:
★
In any time, put the circuit in power-off status as possible as can. Take
appropriate cut-off/turn-off steps. If the ON/OFF status is undetermined, assume
the circuit is electrified. You can use AC/DC voltage measurement function of
the meter to determine if the circuit is in power-on status.
3
★
Use protection device for the power-on circuit: Use insulating tools. Put up
wear fireproof suit, goggle, and insulating gloves. Take off watch or other
adornment. Stand on an insulating pad.
★
Draw lesson from experienced electricians: Keep one hand away from
other objects. This way will reduce the possibility that closed-loop current goes
through your thorax and heart.
★
When perform insulating resistance test:
※
Do not connect the insulation tester to an electrified conductor equipment.
Follow manufacturer’s suggestions to perform the test.
※
Cut off fuse, electric switch, and circuit breaker. Turn off the to-be-tested
equipment.
※
Disconnect branch circuit wire, earthed wire and other equipment from the
to-be-tested equipment.
※
Before and after the test, discharge capacitors of the to-be-tested object.
Some equipment may have automatic discharge function.
※
Check if there is leakage current going through fuse, electric switch, and
discharge circuit breaker. Leakage current would cause incorrect test result.
※
When the insulation is in bad condition, equipment would generate
electric arc. Therefore, do not use the insulation tester in a dangerous
environment with combustible and explosive gas.
※
When connect test cable, use a pair of insulating rubber gloves.
5, Important tips
What the insulating resistance tester measures is surface-to-surface resistance
value of the object under test, but not point-to-point one. Therefore, the wire
should not be connected to surface of a non-conductive object (such as cable
rubber and plastic case). It is necessary to use a conductive material (such as
silver paper) to cover surface of the to-be-tested object, and next, connect a
wire to the conductive surface, and then, you can perform the measurement.
IV. Technical characteristics and operating description of the multimeter
Accuracy: ±% reading ± number, one-year warranty
Environment to guarantee accuracy: 23
°
C±5
°
C, less than 75%RH
DC voltage (DCV)
Range
Accuracy
Resolution
400mV 0.1mV
4V 1mV
40V 10mV
400V
±(0.5%+5d)
100mV
1000V ±(0.8%+5d)
1V
Input impedance: 400mV>1000M
Ω
; 10M
Ω
for other ranges.
Maximum input voltage: DC or AC peak value 1000V.
AC voltage (ACV)
Range
Accuracy
Resolution
4V 1mV
40V 10mV
400V
±(0.8%+5d)
100mV
700V ±(1%+5d)
1V
Frequency range: 40Hz
～
400Hz (400V and 700V range is 40Hz
～
100Hz).
Maximum input voltage: DC or AC peak value 1000V.
Display: Average (Sine wave virtual value calibration)
DC current (DCA)
Range Accuracy Resolution
40mA 10mA
400mA
±(0.8%+5d)
100mA
Overload protection: 0.5A/250V fuse.
AC current (ACA)
Range Accuracy Resolution
40mA 10mA
400mA
±(1%+5d)
100mA
Overload protection: 0.5A/250V fuse.
Resistance
Range Accuracy Resolution
400
Ω
0.1
Ω
4k
Ω
1
Ω
40k
Ω
10
Ω
400k
Ω
±(0.8%+5d)
100
Ω
4M
Ω
±(1%+3d)
1k
Ω
40M
Ω
±(2%+3d)
10k
Ω
Overload protection: 250V RMS
Capacitance
Range Accuracy
Resolution
40nF 10pF
400nF 100pF
4
μ
F 1nF
40
μ
F
±(3%+5d)
10nF
Overload protection: 250V RMS
Frequency (FREQ)
Range Accuracy
Resolution
40Hz 0.01Hz
400Hz 0.1
Hz
4KHz 1
Hz
40KHz 10
Hz
400KHz 100
Hz
4MHz
±(0.5%+3d)
1K Hz
Overload protection: 250V RMS Input sensitivity: 2V RMS
Attention: If the frequency amplitude under test is larger than 50V, please press
“SELECT” key of ACV function to enter frequency function, and then
make the measurement.
Forward voltage of the diode
Display approximate forward voltage value of the diode. Test condition:
Forward DC current of approx. 0.5mA, reverse DC voltage of approx. 1.5V.
Continuity test
When the ON resistance is less than approx. 380
Ω
, the buzzer in the meter
buzzes. Test condition: open circuit voltage of approx. 0.5V.
Operating description of the digital multimeter
AC/DC voltage measurement
Turn the switch knob to “V=” or “V~” range. Insert one end of the black pen
into the jack of “COM”. Insert one end of the red pen in the jack of “V/
Ω
/mA
/Hz/CAP”. Connect the other end of the two pens in parallel to two terminals
of the to-be-tested circuit. The value on the LCD screen can be directly read;
Attention: 1) Input voltage should not exceed the limited value. If does, there
is danger of damaging the meter circuit. When the displayed value is larger
than DC1100VHU or AC770V, OL is displayed in the meter, indicating the input
voltage has exceeded maximum limit value of the meter; 2) When perform
measurement of high voltage circuit, be sure that human body will not contact
the high voltage.
AC/DC current measurement
Turn the switch knob to “mA” range. Here, the meter is preset to DC current
measurement mode. Insert one end of the black pen into the jack of “COM” and
one end of the red pen into the jack of “V/
Ω
/mA/Hz/CAP”. If take measurement
of DC current, connect the other end of the two pens in series to the to-be-tested
circuit. The value on LCD screen can be directly read. If take measurement of
AC current, press “SELECT” key to switch to AC current range. Connect the
other end of the two pens in series to the to-be-tested circuit and read the
displayed value.
Attention: 1) Input current must not exceed the limited value. If does, there
is danger of damaging the meter circuit.
Resistance and Continuity measurement
Warning!
When perform resistance and continuity measurement, it is
necessary to guarantee that no voltage is applied across the to-be-tested circuit or
component.
Set the switch knob to
Ω
position. Here, the meter is preset to resistance
range. Insert one end of the red pen into the jack of “V/
Ω
/mA /Hz/CAP”, and
one end of the black one into the jack of “COM”. Connect the other end of the
two pens in parallel to two terminals of the to-be-tested circuit or component
and read the resistance value.
Press “SELECT” key to switch to
range. When the tested resistance
value is less than approx. 380
Ω
, the buzzer would buzz. This is continuity test.
When the pens are open-circuited or input is overloaded, “OL” will be
displayed on the screen.
Forward voltage measurement of the diode
Turn the switch knob to “
Ω
” position. Press “SELECT” key to switch to
range. Insert one end of the red pen into the jack of “V/
Ω
/mA /Hz/CAP”
and one end of the black pen into the jack of “COM” (polarity of the red pen is
“+”). Connect the other end of the two pens in parallel to two terminals of the
to-be-tested diode and read the forward voltage value. When the diode is
reversely connected or the input terminal is open-circuited, “OL” will be
displayed on the screen.
Capacitance measurement
Warning
！
When perform capacitance measurement, it is necessary to
guarantee the to-be-tested capacitor is completely discharged.
Turn the switch knob to “
Ω
CAP” position. Press “SELECT” key to switch to
CAP range. Insert one end of the red pen into the jack of “V/
Ω
/Hz/CAP/mA”
and one end of the black pen into the jack of “COM”. Connect the other end of
the two pens in parallel to two terminals of the to-be-tested capacitor and read
the capacitance value. When capacitance value is relatively large, it may take
over 10 minutes to make the measurement.
