V1.0
-4- -5- -6-
尺寸：100*140mm
-7- -8-
DIAGRAM
GETTING TO KNOW YOUR DEVICE
● BUTTONS FUNCTIONS
Thank you for purchasing the Auto Ranging 4000 Counts
Digital Clamp Meter from AstroAI. The AstroAI Auto Ranging
Digital Clamp Meter is designed to be safely and accurately
used by professionals in a commercial setting or weekend
DIYer’s that need a little more utility from their standard digital
multimeter. This manual provides all safety information,
operation instructions, specifications, and maintenance for the
meter. The instrument performs AC/DC Voltage, AC/DC
Current, Resistance, Audible Continuity, Diode, Frequency,
Capacitance, CV, LIVE TEST and Duty Cycle. Thank you
again for choosing AstroAI, if you have any questions or
concerns regarding your product, please contact us at
NOTE: Fully read and understand this manual before using this
Digital Multimeter.
WARNING
● Use the Meter strictly in accordance with this manual,
otherwise the protection function provided by the Meter may
be damaged or weakened.
● Please be especially careful when measuring over 60V DC,
30V AC RMS or 42V peak value, there is a danger of an
electric shock.
● Do not apply more than the rated voltage, as marked on the
Meter, between the terminals or between any terminal and
grounding.
To avoid possible electric shocks or personal injury, and to
avoid possible damage to the Meter or to the equipment being
tested, adhere to the following rules:
● Check whether the Meter is working normally by measuring
the known voltage, do not use it if the readings are incorrect
or the Meter is damaged.
● Before using the meter, please check whether there are
cracks or damage to the plastic parts of the meter casing.
Do not use the Meter if all or part of the exterior casing is
damaged.
● Before using the Meter, please check whether the test leads
are cracked or damaged. Please replace the test leads with
the same model and same electrical specifications if the
leads are damaged.
● Use the Meter according to the measurement category,
voltage or current rating specified on the meter or manual.
● Comply with local and national safety regulations. Wear
personal protective equipment (such as approved rubber
gloves, masks, and flame-retardant clothing, etc.) to prevent
injury from electric shocks and arcs when hazardous live
conductors are exposed.
● Replace the battery as soon as the low-battery indicator
appears to avoid measurement errors.
● Do not use the Meter around explosive gas or steam; or
humid environments.
● When using the test leads, keep your fingers behind the
finger guards.
● Do not measure the current when the test lead is inserted
into the INPUT Terminal.
● Do not let the Meter work alone without someone being
present.
● When measuring, connect the neutral wire or ground wire
first, and then connect the live wire; when disconnecting,
disconnect the live wire first, and then disconnect the neutral
wire and finally the ground wire.
● Before opening the case or battery cover, remove the test
leads from the Meter first. Do not use the Meter when it is
disassembled or the battery cover is opened.
ELECTRICAL SYMBOLS
AUTO POWER OFF
● Rotating the rotary switch from the OFF button to any gear
will turn on the power. After 15 minutes of standby, the Meter
will automatically power off. To turn it on again, just rotate
the range switch or press the button.
● To avoid damage to the Meter, do not measure voltage
exceeding 600V.
● Pay special attention to safety when measuring high voltage
to avoid electric shock or personal injury.
● Before using the Meter to test a known voltage or current,
confirm that the Meter functions work properly.
OPERATION INSTRUCTIONS
Ⅰ.MEASURING AC/DC CURRENT
● After the reading stabilizes, record the reading from the LCD
screen.
-3-
● The Meter can only be used with the equipped test leads to
meet the requirements of safety standards. If the test leads
are damaged and need to be replaced, replace only the
same model and the same electrical specifications.
！
Ω
Hz
mV/V
Live
mA/A
AC
(Alternating Current)
DC (Direct Current)
AC and DC
Capacitance Test
Resistance Test
Double Insulation
Voltage
Live Wire Detection
Low Battery Symbol
Audible Continuity Test
Diode Test
Earth Ground
Frequency
Warning
Current
Compliant with
EU Standards
NCV
%
Non-Contact
Voltage Setting
Duty Cycle
1
2
3
4
5
6
7
10
9
11
12
14
13
！
600V
CAT Ⅲ
！
MAX
600A~
H
8
15
16
17
18
19
2120
22
23
24
3
Flashlight
NCV Detector
1
Transformer Jaws
2
Trigger
4
FUNC Button
5
ZERO Button
6
LCD Screen
7
MAX/MIN Button
8
Backlight Button/Flashlight Button
9
Rotary Switch
10
OFF
11
AC/DC Current Test
12
Frequency Test/Low Pass Filtering
13
AC/DC Voltage Test
14
Capacitance/Resistance
15
Continuity Test/Diode Test
16
Indicator Light
19
NCV Detection
18
Frequency Test/Duty Cycle
17
COM Terminal
20
INPUT Terminal
21
HOLD Button
22
Test Leads
23
Storage Bag
24
Button Function
● Use the FUNC button to further select the function
if there are multiple functions in one rotary setting.
NOTE: Pay special attention to making sure the
selected setting is correct before performing any test.
H
● Press the HOLD button to hold or cancel the data.
Press this button while performing a test to hold
(freeze) the reading for recording, then the screen
will keep the reading when the hold function is
activated. Press the HOLD button again to turn off
this function.
NOTE: The screen will display “ ” when the data
hold function is activated.
H
● Press the button to turn on/off the screen’s
backlight; Long press the button to turn on the
flashlight. Press the button to turn on the
backlight, then the reading can be seen clearly in a
dim environment. Press the button again to turn
off the backlight. Long press the button to turn
on the flashlight; Long press it again to turn off the
flashlight.
● Press the MAX/MIN button to turn on/off the
maximum value record. You can use this function
when you need to record the maximum/minimum
value in the measurement scale. First, you need to
connect the meter to the circuit, and then press the
MAX/MIN button (please do not remove test leads
during this measurement) to turn on the
maximum/minimum value function, then the LCD
display will show the maximum/minimum value of all
the measured data; Press and hold the button for
more than two seconds to exit this function.
NOTE: The screen will display “ MAX ” when the
maximum value function is turned on; The screen
will display “ MIN ” when the minimum value
function is turned on.
● Turn the rotary dial to the“ ”or“ ”setting. The screen
will display “ ” indicating that the measurement function is
DC current.
Note: Under the DC current function, press
the button to reset the reading on the
screen before measuring and “ZERO” will
be displayed.
-9-
● Press the trigger to open the transformer
jaws, clamp the conductor to be tested, and
then slowly release the trigger until the
clamp head is completely closed.
Determine whether the conductor to be
tested is clamped in the center of the clamp
head. Additional error will occur if the
conductor is not placed in the center of the
clamp head.
● Turn the rotary switch to the OFF position to turn off the
Meter.
Ⅱ.MEASURING AC/DC VOLTAGE
● Insert the red test lead into the INPUT terminal and the
black test lead into the COM terminal.
● Turn the rotary dial to the continuity test,
touch the red test lead and the black test
lead to check whether they are normal. The
buzzer will beep and the indicator light will
come on if the test leads are normal.
-10-
● Press the FUNC button to switch to AC
current test. The screen will display “ ”
indicating that the measurement function
is AC current.
NOTE: When measuring the AC current,
press the FUNC button to check the
frequency and enter the low pass filtering
(LPF) function. The screen will display
“Hz” and “ ”, respectively.
● Connect the meter in parallel to the circuit under test.
NOTE: If the reading is negative when measuring the DC
voltage, it means that the positive and negative poles of the
test leads are reversed, please change the test leads.
● After the reading stabilizes, record the reading from the LCD
screen.
● Turn the rotary switch to the OFF position to turn off the
Meter.
-11-
Ⅲ.MEASURING RESISTANCE
● Insert the red test lead into the INPUT terminal and the
black test lead into the COM terminal.
● Turn the rotary dial to the continuity test,
touch the red test lead and the black test
lead to check whether they are normal. The
buzzer will beep and the indicator light will
come on if the test leads are normal.
● Turn the rotary dial to the “ ”
setting. The screen will display
“Ω” indicating that the
measurement function is
resistance.
● Connect the test leads to both ends of the circuit or resistor
under test (connect the leads to the resistance under test in
parallel).
-12-
Ⅳ.MEASURING CAPACITANCE
● After the reading stabilizes, record the reading from the LCD
screen.
● Turn the rotary dial to the continuity test,
touch the red test lead and the black test
lead to check whether they are normal. The
buzzer will beep and the indicator light will
be on if the test leads are normal.
● Turn the rotary switch to the OFF position to turn off the
Meter.
RESISTANCE NOTES
● Do not change the resistance while taking a measurement.
Doing so may damage the Meter and affect the test results.
● Do not test parallel circuits. The accuracy of the
measurement will be affected, and the results may not be
accurate.
● Do not directly measure the internal resistance of micrometers,
galvanometers, batteries, and other instruments.
● Insert the red test lead into the INPUT terminal and the
black test lead into the COM terminal.
● Turn the rotary dial to the “ ” setting.
Press the FUNC button to switch to
capacitance test. The screen will display
“n F” indicating that the measurement
function is capacitance.
-13-
Ⅴ.CONTINUITY TEST
CAPACITANCE TIPS
● If the measured value is significantly different from the value
marked on the capacitor, the capacitor is damaged.
● Insert the red test lead into the INPUT terminal and the
black test lead into the COM terminal.
● Connect the test leads to both ends of the circuit or resistor
under test (connect the leads to the resistance under test in
parallel).
CAPACITANCE NOTES
● Before measuring the capacitance, discharge the capacitor
to avoid damage to the Meter. Do so by connecting the
capacitor to a high-powered resistor.
● Discharge the capacitor after measurement to avoid any
potential safety hazards.
● If the capacitance is large, it may take a long time for the
reading to stabilize.
● After the reading stabilizes, record the reading from the LCD
screen.
● Turn the rotary dial to the “ ” setting. The
screen will display “ ” indicating that the
measurement function is continuity. Touch
the red test lead and the black test lead to
check whether they are normal. The buzzer
will beep if the test leads are normal.
-14- -15-
DIODE TEST TIPS
● Is the diode functioning correctly? If the red test lead is
connected to the positive pole of the diode and the black
lead is connected to negative, then the diode should be in a
forward conduction state, and the displayed value is the
forward voltage drop.
● Normal diode forward pressure drops: the general silicon
tube is 0.5- 0.7 V, germanium tube is 0.15-0.3V.
● If "0000" is displayed, the diode is broken.
● You can also verify that the red test lead is connected to the
negative pole of the tested diode and the black test rod is
connected to the positive pole. The diode should display “OL”.
● The LCD screen will display the approximate voltage drop
reading of the diode. If the test leads are connected
reversely, “OL” will be displayed on the LCD screen. Please
replace the test leads to measure again.
● Turn the rotary switch to the OFF position to turn off the
Meter.
● Connect the red test lead to the anode of the diode under
test and the black test lead to the cathode of the diode.
NOTE: Usually the anode of the diode is the longer end.
POLARITY JUDGMENT METHOD
● Switch the Multimeter to the Resistance setting.
● Connect the two test leads to the two electrodes of the diode.
● Measure one result, then swap the positions of the test
leads, then measure the second result.
● The larger result is the reverse resistance and the smaller
result is the forward resistance. The smaller resistance is
when the black test lead is connected to the positive end of
the diode and the red lead is connected to the negative end.
-16-
Ⅶ.FREQUENCY TEST
● Insert the red test lead into the INPUT terminal and the
black test lead into the COM terminal.
● Turn the rotary dial to the continuity test,
touch the red test lead and the black test
lead to check whether they are normal. The
buzzer will beep and the indicator light will
be on if the test leads are normal.
● Turn the rotary dial to the “Hz/%”
setting. The screen will display
“Hz” indicating that the
measurement function is
frequency.
● Connect the test leads in parallel to both ends of the tested
power supply or circuit.
● After the reading stabilizes, record the reading from the LCD
screen.
● Turn the rotary switch to the OFF position to turn off the
Meter.
Ⅷ.DUTY CYCLE TEST
● Insert the red test lead into the INPUT terminal and the
black test lead into the COM terminal.
-17-
● Turn the rotary dial to the continuity test,
touch the red test lead and the black test
lead to check whether they are normal. The
buzzer will beep and the indicator light will
be on if the test leads are normal.
● Connect the test leads in parallel to both ends of the tested
power supply or circuit.
● After the reading stabilizes, record the reading from the LCD
screen.
● Turn the rotary switch to the OFF position to turn off the
Meter.
● Turn the rotary dial to the
“Hz/%” setting. Press the FUNC
button to duty cycle test. The
screen will display “ % ”
indicating that the measurement
function is duty cycle.
Ⅸ.NON-CONTACT VOLTAGE
● Turn the rotary dial to the
“NCV/Live” setting. The screen
will display “NCV” indicating
that the measurement function
is non-contact voltage.
-20-
SPECIFICATIONS
32°F~104°F(0℃~40℃；
<80% RH，<10°C Non-condensing)
Auto ou Manual
“ - ”Automatically displayed
“ OL” Displayed
displayed when battery
voltage is lower than normal
Range Selection
Polarity Indication
Overload Indication
Low Battery
Indication
Work Environment
Storage
Temperature
Power
Weight
Dimensions
Safety/Compliance
14°F~122°F(-10℃~6℃；
<70% RH, Remove the Battery)
2 x 1.5V AAA Batteries
Approximately205g
195×68×29mm
CAT.III 600V;
Pollution Level: 2; Altitude <2000m.
35X25mm
LCD Dimensions
4000，3 ¾
3 Times/Second
Digital Display
Sampling Speed
Auto Ranging 4000 Counts
Digital Clamp Meter
Ⅰ.PRECISION INDEX
Reference Conditions: Ambient Temperature :18°C to 28°C ;
Relative Humidity: ≤ 80% ; Accuracy: (%rdg + dgts)
The accuracy is applicable within one year after calibration.
DETAILED SPECIFICATION
● Overload Protection: 250V
Ⅶ.CAPACITANCE
Ⅷ.FREQUENCY/DUTY CYCLE
FREQUENCY MEASUREMENT BY “Hz” SETTING
● Measuring range: 0 ~ 4MHz
● Voltage range: 0.2~10V AC (the higher the measured
frequency, the higher the voltage should be)
● Overload Protection: 250V
FREQUENCY MEASUREMENT BY “V” SETTING
● Measuring range: 0 ~ 100 kHz
● Voltage range: 0.5~600V AC (the higher the measured
frequency, the higher the voltage should be)
● Overload Protection: 250V
FREQUENCY MEASUREMENT BY “A” SETTING
● Measuring range: 0 ~ 1kHz
● Signal range: ≥1/4 range (the higher the measured
frequency, the higher the current should be)
The buzzer inside the
Meter will beep if the
resistance<50Ω.
Open Circuit Voltage:
approximately 1.0V;
Overload Protection:
250 V
IX.CONTINUITY TEST
The approximate diode
forward voltage value
will be displayed.
Reverse DC Voltage:
approximately 2.0V ;
Overload Protection:
250V
X.DIODE TEST
● 1 x Owner’s Manual
● 1 x Pair of Test Leads
● 1 x Storage Bag
● 1 x AstroAI 4000 Counts CLAMP METER
INCLUDED IN BOX
HOW TO DISPOSE OF THE METER
If you at some point intend to dispose of this product, please
keep in mind that many of its components consist of valuable
materials, which can be recycled. Please do not discard it in
the garbage bin, but check with your local authorities for
recycling facilities in your area.
3 Year Warranty Limited Warranty from AstroAI Each AstroAI
Digital Multimeter will be free from defects in material and
workmanship. This warranty does not cover fuses, disposable
batteries and damage from neglect, misuse, contamination,
alteration, accident, or abnormal conditions of operation or
handling, including over-voltage failures caused by use
outside the Multimeter’s specified rating, or normal wear and
tear of mechanical components. This warranty covers the
original purchaser only and is not transferable.
If this product is defective, please contact AstroAI Customer
Support at [email protected].
VOLTAGE NOTES:
● To avoid damage to the meter, do not measure voltage
exceeding 600V DC or 600V AC CATIII.
● Pay special attention to the voltage setting of the Multimeter.
The LCD screen will indicate whether the setting is in AC.
Use the “FUNC” button to choose the correct setting.
● If the AC setting is used to measure DC and vice versa, an
overflow symbol will be displayed. Performing this has the
potential to damage the Meter or any components you are
attempting to test.
● When measuring voltage, the result will fluctuate depending
on the power supply. Generally speaking, the result will
fluctuate ±10V, which is NOT an inaccurate result.
Ⅵ.DIODE TEST
● Turn the rotary switch to the OFF position to turn off the
Meter.
● Connect the test leads to both ends of the circuit
or resistor under test (parallel). If the resistance
of the circuit or resistor under test is connected
and less than 50Ω, the buzzer will emit a beep
and the measured resistance value will be
displayed on the LCD display.
● If the circuit or resistor under test is
disconnected, or the resistance value is
greater than 50Ω, the LCD screen will
display “OL”.
● Insert the red test lead into the INPUT terminal and the
black test lead into the COM terminal.
● Turn the rotary dial to the continuity test,
touch the red test lead and the black test
lead to check whether they are normal. The
buzzer will beep and the indicator light will
be on if the test leads are normal.
● Turn the rotary dial to the “ ”
setting. Press the FUNC button
to switch diode test. The screen
will display “ ” indicating that the
measurement function is diode.
-18- -19-
MAINTENANCE
CLEANING THE METER
If there is dust or humidity in the terminals, it may produce
erroneous measurements. Please clean the Meter as follows:
● Turn off the power to the Meter and remove the test leads.
● Turn the meter over and shake out the dust accumulated in
the input jack, wipe the case with a damp cloth or mild
detergent. Wipe the contacts in each terminal with a clean
cotton swab dampened in alcohol.
REPLACING THE BATTERY
● Turn off the Meter and remove the test leads.
● Unscrew the screws fixing the battery cover with a
screwdriver, and remove the battery cover.
● Remove the old battery and replace it with a new battery of
the same specification.
● Put the battery cover back to its original position and fix the
battery cover with the removed screws.
● Battery Type: 2 x 1.5V AAA Batteries
Web:.astroai.com
E-mail:[email protected]
-21- -22- -23- -24- -25-
！
600V
CAT Ⅲ
！
MAX
600A~
This manual provides all safety information, operation
instructions, specifications, and maintenance for the meter. This
Digital Clamp Meter has been designed according to EN61010-1
oncoming electronic measuring instruments with an over voltage
category (CAT III 600V) and Pollution degree 2.
SIZE
2.7in
7.7in
！
600V
CAT Ⅲ
！
MAX
600A~
1.1in
H
● Press the button to reset the reading under the
DC current function.
● Turn the rotary dial to the “ ”
setting. The screen will display
“ ” indicating that the
measurement function is DC
voltage.
● Press the FUNC button to switch to AC voltage
test. The screen will display “ ” indicating that
the measurement function is AC voltage.
NOTE: When measuring the AC voltage, press
the FUNC button to view the frequency and
enter the low pass filtering (LPF) function. The
screen will display “Hz” and “ ”, respectively.
● Turn the rotary switch to the OFF position to turn off the
Meter.
● Turn the rotary switch to the OFF position to turn off the
Meter.
● Turn the rotary switch to the OFF position to turn off the
Meter.
Ⅹ.LIVE WIRE DETECTION
● Insert the red test lead into the INPUT terminal.
● Turn the rotary dial to the “NCV/Live”
setting. Press the “FUNC” button to switch
to live wire detection. The screen will show
“Live” indicating that the measurement
function is live wire detection.
● Move the NCV detector close to the point to be tested:When
the Meter senses a weak AC signal, the green indicator light
will be on, the buzzer will emit a slow, audible beep and the
screen will display “---L”; When the Meter senses a strong
AC signal, the red indicator light will be on, the buzzer will
emit a quick beep and the screen will display “---H”.
NOTE: When the indicator light is on, it means there is
voltage, please pay attention to your safety!
● Touch the point to be measured with the tip of the red test
lead:When the indicator light is on, it means that the
measured position is live wire, please pay attention to your
safety! The reason that the green light is on may be that the
test lead is not fully connected to the socket. Please test
again after the test lead is fully connected.
NOTE: When the meter senses a weak AC signal, the LCD
screen will display “---L”, and the buzzer will emit a slow
beep; When the meter senses a strong AC signal, the LCD
screen will display “---H”, and the buzzer will emit a quick
beep.
Ⅱ.DC VOLTAGE
400mV
Range
Resolution
Accuracy
0.1mV
4V
0.001V
40V
0.01V
±(0.5% rdg +5 dgts)
400V
0.1V
600V
1V
● Input Impedance: 10MΩ
● Overload Protection: 600V
● Maximum Measuring Voltage: 600V
Ⅲ.AC VOLTAGE
● Input Impedance: 10MΩ
● Overload Protection: 600V
● Maximum Measuring Voltage: 600V
● Frequency Range: 40Hz ~ 1kHz
● Response: True RMS
4V
0.001V
40V
0.01V
±(1.0% rdg +5 dgts)
400V
0.1V
600V
1V
Range
Resolution
Accuracy
Ⅳ.DC CURRENT
Ⅴ.AC CURRENT
● Frequency Range: 40Hz ~ 400Hz
● Response: True RMS
● Overload Protection: 250V
Ⅵ.RESISTANCE
40A
0.01A
400A
0.1A
±(2.5% rdg +5 dgts)
Range
Resolution
Accuracy
40A
0.01A
400A
0.1A
50~60Hz: ±(2.5 rdg +5 dgts)
Other: ±(3.0% rdg +10 dgts)
Range
Resolution
Accuracy
4MΩ 0.001MΩ
40MΩ 0.01MΩ
400Ω 0.1Ω
4kΩ 0.001kΩ
40kΩ 0.01kΩ
±(1.0% rdg +5 dgts)
400kΩ 0.1kΩ
Range
Resolution
Accuracy
4nF 0.001nF
40nF 0.01nF
400nF 0.1nF
±(4.0% rdg +5 dgts)
4μF 0.001μF
40μF 0.01μF
400μF 0.1μF
4mF 0.001mF
Range
Resolution
Accuracy
40Hz 0.01Hz
400Hz 0.1Hz
4kHz 0.001kHz
±(1.0% rdg +3 dgts)
1~99% 0.1%
±(3.0% rdg +3 dgts)
40kHz 0.01kHz
400kHz 0.1kHz
4MHz 0.001MHz
Range
Resolution
Accuracy
