ASTROAI USER MANUAL
AUTO RANGING 202D DIGITAL CLAMP METER
Thank you for purchasing the 202D Auto Ranging Digital Clamp Meter from AstroAI. The
AstroAI 202D 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
instruction, specifications, and maintenance for the meter. This instrument measures AC/DC
voltage, AC Current, Resistance, Continuity, as well as Diode Measurements. Additional
features and functions included polarity indication, data hold, maximum value hold, over range
indication, and automatic power-off. Thank you again for choosing AstroAI, if you have any
questions or concerns regarding your product, please contact us at support@astroai.com.
NOTE: Fully read and understand this manual before using this Digital Multimeter.
This manual provides all safety information, operation instructions, specifications, and
maintenance for the meter. This Digital Clamp Meter has been designed according to EN610101 oncoming electronic measuring instruments with an overvoltage category (CAT II 600V) and
Pollution degree 2.
WARNING: To avoid possible electric shock or personal injury, and to avoid possible damage to
the Meter or to the equipment being tested, adhere to the following rules:
● Before using the Meter, inspect the exterior casing. Do not use the Meter if it is damaged
or if all or part of the exterior casing is removed. Look for cracks or missing plastic. Pay
special attention to the insulation around the connectors.
● Inspect the test leads for damaged insulation or exposed metal. Check the test leads for
continuity.
● Do not apply more than the rated voltage, as marked on the Meter, between the
terminals or between any terminal and grounding.
● The manual rotary switch should be placed in the correct position before measurement
and should NOT be moved during measurement to prevent damage to the Meter.
● When the Meter is working at an effective voltage over 60V in DC or 30V rms in AC,
special care should be taken because there is a danger of electric shock.
● Use the proper terminals, function, and range for your measurements.
● Do not use or store the Meter in a high-temperature environment, do not expose to high
levels of humidity, or near strong magnetic fields. The performance of the Meter may
deteriorate after dampening.
● When using the test leads, keep your fingers behind the finger guards.
● Disconnect circuit power and discharge all high-voltage capacitors before testing
resistance, continuity, or diodes.
● Replace the battery as soon as the battery indicator appears. With a low battery, the
Meter might produce false readings that can lead to electric shock and personal injury.
● Remove the connection between the testing leads and the circuit being tested, and turn
the Meter power off before opening the Meter case.
● When servicing the Meter, use only the same model number or identical electrical
specifications replacement parts.
● The internal circuit of the Meter shall not be altered at will to avoid damage of the Meter
and any accident.
● Clean using a soft cloth and mild detergent for the surface of the Meter. Do not use
abrasive materials or solvents to prevent the surface of the Meter from corrosion and
damage.
● Turn the Meter off when not in use and take out the battery when it is not going to be
used for an extended period of time. Regularly check the battery as it may leak when it
has not been used for some time. Replace the battery as soon as leaking appears. A
leaking battery will damage the Meter.
GENERAL INFORMATION
Display LCD, 2000 Counts updated 2/sec
LCD Size 30*49mm
Polarity Indication “-” displayed automatically
Over-Range Indication “OL” displayed
Low Battery Indication
“ ” displayed
Range Select Auto
Operating Temperature 32°F~104°F (0°C~40°C), less than 80%
Relative Humidity
Storage Temperature 14°F~122°F (-10°C~50°C), less than 85%
Relative Humidity
Battery Type
1.5V x 2, AAA size
Dimensions 213 x 52 x 31mm
Weight Approx 190g
ELECTRICAL SYMBOLS
∽
AC (Alternating Current)
Low Battery
DC (Direct Current)
Diode
≂
DC or AC
Fuse
Earth Ground
Continuity Test
Double Insulated
Warning
AUTO
Auto Range
Dangerous Voltage may be present
Complies with EU directives
MULTIMETER DIAGRAM
1. Transformer Jaws:
Picks up AC Current flowing through the conductor.
2. Trigger
Press to open the transformer jaws, when the trigger is not pressed, the jaws will
automatically close.
3. SELECT Button
Push this button to select which function to use depending on the Function/Range
Switch.
4. Display
3 1/2 digit LCD, with a maximum reading of 1999.
5. COM Input Jack
Low input for all voltage, resistance, and continuity measurements. Will accept banana
plugs.
6. Function/Range Switch
Use this switch to select the desired function and range.
7. DATA HOLD Button
①
②
⑥
⑦
③
④
⑧
⑨
⑤
When this button is pushed, the display will show the last reading and “H” symbol will
appear until the DATA HOLD button is pushed again. Data holding will be cancelled
automatically when the function switch is changed/rotated.
8. MAX HOLD Button
When this button is pushed, the display will show the last Maximum reading and the
“M.H.” symbol will appear until the MAX HOLD button is pushed again. Maximum hold
will be cancelled automatically when the function switch is changed/rotated.
9. VΩ Input Connect
High input for voltage, resistance, and continuity measurement that will accept banana
plugs. When measuring insulation resistance, use for accepted insulation tester unit VΩ
banana plugs.
SPECIFICATIONS
Accuracy is guaranteed for 1 year when recommended storage temperatures are met
(14°F~122°F (-10°C~50°C), less than 85% Relative Humidity).
DC VOLTAGE (Auto ranging)
Range Resolution Accuracy
200mV 0.1mV ±(0.8% of rdg + 5dgts)
2V 1mV
±(0.5% of rdg + 3dgts)
20V 10mV
200V 100mV
600V 1V ±(1.0% of rdg + 5dgts)
Input Impedance: 10MΩ
Overload Protection: 600V DC/AC rms
Max. Input voltage: 600V DC
AC CURRENT (Auto ranging)
Range Resolution Accuracy
2A 1mA
±(2.5% of rdg + 10dgts)
20A 10mA
200A 100mA
±(2.0% of rdg + 5dgts)
400A 1A
Measuring Voltage Drop: 200mV
Frequency Range: 40 - 200Hz
AC VOLTAGE (Auto ranging)
Range Resolution Accuracy
200mV 0.1mV ±(1.2% of rdg + 5dgts)
2V 1mV
±(1.2% of rdg + 3dgts)
20V 10mV
200V 100mV
600V 1V ±(1.2% of rdg + 8dgts)
Input Impedance: 10MΩ
Frequency Range: 40Hz - 400Hz
Overload Protection: 600V DC/AC rms
Max. Input voltage: 600V AC rms
RESISTANCE (Auto Ranging)
Range Resolution Accuracy
200Ω 0.1Ω
±(1.5% of rdg + 3dgts)
2KΩ 1Ω
20KΩ 10Ω
200KΩ 100Ω
2MΩ 1KΩ
20MΩ 10KΩ
Open Voltage: about 0.25V
Overload Protection: 250V DC/AC RMS
DIODE AND CONTINUITY
Range Introduction Remark
The approximate forward
voltage drop will be
displayed
Open circuit voltage: about
1.5V
The built-in buzzer will
sound if the resistance is
less than about 30Ω.
Open circuit voltage: about
0.5V
Overload Protection: 250V DC/AC RMS
For continuity test: When the resistance is between 30Ω and 100Ω, the buzzer may sound or
may not sound. When the resistance is more than 100Ω, the buzzer will not sound.
OPERATION INSTRUCTIONS
Measuring Voltage
1. Connect the Black test lead to the COM Jack and the Red test lead to the V Jack.
2. Set the function switch to V~ or V range.
3. Connect the test leads to the source or load to be measured.
4. Read the LCD display for the polarity of the Red test lead. The result will be a DC
measurement.
NOTE:
a. When measuring in a small range (E.G. mV), the meter may display an unstable reading
when the test leads have not been connected to the load to be measured. It is normal
and will not affect the measurements.
b. To avoid damage to the meter, do not measure a voltage which exceeds 600V for DC or
AC, depending on measurement function.
Measuring AC Current
1. Set the function switch to the AC 200/400A range. If the display indicates one or more
leading zeros, shift to the 2/20Z range to improve the resolution of the measurement.
2. Press the trigger to open the transformer jaws and clamp one conductor only. It is
impossible to make measurements when two or three conductors are clamped at the
same time.
3. The result displayed will be AC Current.
Measuring Resistance
1. Connect the Black test lead to the COM Jack and the Red test lead to the “VΩ” Jack.
(Note: the polarity of the red test lead is positive “+”)
2. Set the function/range switch to “Ω” range.
3. Connect the test leads to the load being measured.
4. Read the results on the display.
NOTE:
a. For resistance measurements >1MΩ, the meter may take a few seconds to stabilize the
reading. This is normal for high-resistance measurements.
b. When the input is not connected, (E.G. the circuit is open) the symbol “OL” will be
displayed as an over range indicator.
c. Before measuring in-circuit resistance, be sure that the circuit being tested has all power
removed and all capacitors are fully discharged.
Continuity Test
1. Connect the Black test lead to the COM Jack and the Red test lead to the “VΩ” Jack.
2. Set the function/range switch to “ ” range.
3. Press the Select Button to select the continuity measurement mode. The “ ” symbol
will appear as an indicator.
4. Connect the red test lead to the anode of the diode to be tested and the black test lead
to the cathode.
5. The meter will show the approximate forward voltage of the diode. If the connections are
reversed, “OL” will be shown on the display.
6. If the circuit resistance is lower than about 30Ω, the built-in buzzer will sound.
Diode Test
1. Connect the Black Test Lead to the “COM” Jack and the Red Test Lead to the “VΩ”
Jack. (Note: the polarity of the red test lead is positive “+”)
2. Set the function/range switch to “ ” range.
3. Press the SELECT Button to select continuity measurement mode, and the “ ”
symbol will appear as an indicator.
4. Connect the red test lead to the anode of the diode to be tested and black test lead to
the cathode.
5. The meter will show the approximate forward voltage of the diode. If the connections are
reversed, “OL” will be shown on the display.
AUTO POWER OFF
If the meter is not in operation for 15 minutes, it will turn off automatically. To turn it on again,
simply rotate the range switch or press any button.
If you press the “HOLD” button to turn the meter back on after it turns off, the automatic poweroff function will be disabled.
BATTERY REPLACEMENT
If the low battery symbol (“ ”) appears on the display, it indicates that the battery should be
replaced. Remove the screws and open the back case. Replace the dead batteries with new
ones (2x AAA, 1.5V).
INCLUDED IN BOX
1 x Owner’s Manual
1 x Test Lead Pair
1 x Carry Bag
2 x AAA batteries
1 x AstroAI Digital Clamp Meter
DISPOSAL OF THIS ARTICLE
If you at some point intend to dispose of this article, 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
overvoltage 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 support@astroai.com.
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