AstroAI DT132A User manual

ASTROAI USER MANUAL
DT132A 4000 Count Auto-Ranging Multimeter
Thank you for purchasing the AstroAI DT132A 4000 Count Auto-Ranging Multimeter. It is a 3 ¾
digit, 3999 counts, auto-ranging digital multimeter. This multimeter is designed to be safely and
accurately used by anyone to measure AC/DC Voltage, AC/DC Current, Resistance Continuity,
Temperature, Frequency, and test Diodes. This manual provides all safety information,
operation instructions, specifications, and maintenance for the meter.
Helpful functions include polarity indication, data hold, relative data measurements, and
overload indication. This digital multimeter has been designed according to EN61010-1
oncoming electronic measuring instruments with an overload category (CAT III 600V) and
pollution degree 2.
Thank you again for choosing AstroAI, if you have any questions or concerns regarding your
product, please contact us at [e-mail].
NOTE: Fully read and understand this manual before using this Digital Multimeter.
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.
ELECTRICAL SYMBOLS
∽
AC (Alternating Current)
Low Battery
⎓
DC (Direct Current)
Diode
≂
AC and DC  Fuse
 Earth Ground
Continuity Test
⧈
Double Insulated Warning
AUTO Auto Range
Dangerous Voltage may be present
Complies with EU Directives APO Auto Power Off
Battery Capacity Relative Test
Data Hold

MULTIMETER DESCRIPTION
Digital Display 3 ¾ , 3999
Sampling Speed 2 times per second
LCD Size 55 x 31mm
Range Selection Auto or Manual
Polarity Indication “-” displayed
Overload Indication “OL” displayed
Low Battery Indication Yes
Operating Environment 32°F~104°F (0°C~40°C); <80% RH
Storage Temperature 14°F~122°F (-10°C~50°C); <85% RH
Power 3 x 1.5V, AAA battery
Dimensions 145x70x35mm
Weight Approx 157g
Temperature Test Yes
Diode Test Yes
Continuity Test Yes
Frequency Yes

MULTIMETER DIAGRAM
1. LCD Screen
3 ¾ digit LCD screen with a maximum reading of 3999
2. Range Button
The meter defaults to auto range mode when measuring voltage, current,
resistance, or capacitance. When the meter is in auto range mode, “AUTO” is
displayed on the screen.
To enter or exit manual range mode press the “RANGE” button. When entering
manual range mode, “AUTO” will disappear from the screen. When exiting
manual range mode, press and hold the “RANGE” button for 2 seconds.

3. Select Button
When measuring current, press the “SELECT” button two switch the meter
between DC and AC mode.
When measuring diodes and/or continuity, press the button to switch between
the two functions.
4. Data Hold / Backlight Button
Press this button to activate Data Hold. During Data Hold, the results will freeze,
even after there is no longer input into the multimeter. To turn off Data Hold,
simply press the button again.
Activate the Backlight by pressing and holding this button for 2 seconds. To turn
off the backlight, simply press and hold the button for 2 seconds again.
5. Max/Min Button
Press this button to display either the maximum or minimum value the multimeter
records during a measurement test. The maximum and minimum values will be
cleared after cleared when the test function changes or the meter is turned off.
6. Relative Test
Press this button to store the current reading and resets the display to ‘0’. Using
this function sets a relative reference point for the next reading.
This meter will display relative measurements in all functions except frequency.
7. Hz/Duty Button
This button switches between the Hz Function and Duty Cycle Functions.
When measuring AC Voltage, pressing this button will display the frequency of
the AC Voltage.
8. Function Select/Range Switch
Use this switch to select the desired function and range for measurement.
9. “A” Terminal
Plug-in connector for the red test lead for the Current Measurement Function
(200mA~10A).
10. “COM” Terminal
Plug-in connector for black (negative) test lead.
11. INPUT Terminal
Plug-in connector for the red test lead for all measurements except Current
(≥200mA).

SPECIFICATIONS
Accuracy is guaranteed for 1 year (73°F ±9°F, less than 80% RH)
DC Voltage (Auto Ranging)
Range Resolution Accuracy
400mV 0.1mV ± (0.8% of rdg + 5 dgts)
4V 1mV
± (0.8% of rdg + 3 dgts)
40V 10mV
400V 100mV
600V 1V ± (1.0% of rdg + 5 dgts)
Input Impedance: 10MΩ
Overload Protection: 600V DC or 600V AC rms
(200mV range: 250V DC/AC rms)
Max. Input Voltage: 600V DC
AC Voltage (Auto Ranging)
Range Resolution Accuracy
400mV 1mV ± (1.2% of rdg + 5 dgts)
4V 1mV
± (1.0% of rdg + 8 dgts)
40V 10mV
400V 100mV
600V 1V ± (1.2% of rdg + 5 dgts)
Input Impedance: 10MΩ
Frequency Range: 40Hz ~ 400Hz
Overload Protection: 600V DC or 600V AC rms
Response: Average, calibrated in rms of sine wave
Max. Input Voltage: 600V AC rms

Temperature
Range Resolution Accuracy
-40~1370°C 1°C
-40°C~150°C: ± (2.5% + 4)
150°C~1370°C: ± (2.5% + 4)
-40~2000°F 1°F
-40°F~302°F: ± (2.5% + 4)
302°F~2000°F: ± (2.5% + 4)
NOTE: Different temperature sensors are configured in different temperature test ranges and
normal temperature sensors are provided for standard configuration.
DC Current
Range Resolution Accuracy
400µA 0.1µA
± (1.2% of rdg + 8dgts)
4000µA 1µA
40mµA 10µA
400mµA 100µA
4A 1mA
10A 10mA
Overload Protection: µA and mA ranges: F0.5A/600V fuse
4A and 10A ranges: F10A/600V fuse
Max. Input Current: “INPUT” Terminal: 200mA
“A” Terminal: 10A
(For measurements >5A: only measure in durations less than 10 seconds,
in intervals greater than 15 minutes.)
Voltage Drop: 400µA, 40mA and 4A ranges: 40mV
4000µA, 400mA and 10A ranges: 400mV

AC Current
Range Resolution Accuracy
400µA 0.1µA
± (1.5% of rdg + 8dgts)
4000µA 1µA
40mµA 10µA
400mµA 100µA
4A 1mA
± (2.0% of rdg +10dgts)
10A 10mA
Overload Protection: µA and mA ranges: F0.5A/600V fuse
4A and 10A ranges: F10A/600V fuse
Max. Input Current: “INPUT” Terminal: 200mA
“A” Terminal: 10A
(For measurements >5A: only measure in durations less than 10 seconds,
in intervals greater than 15 minutes.)
Voltage Drop: 400µA, 40mA and 4A ranges: 40mV
4000µA, 400mA and 10A ranges: 400mV
Frequency Range: 40Hz ~ 400Hz
Response: Average, calibrated in rms of sine wave
Resistance (Auto Ranging)
Range Resolution Accuracy
400Ω 0.1Ω
± (1.5% of rdg + 3dgts)
4KΩ 1Ω
40KΩ 10Ω
400KΩ 100Ω
4MΩ 1KΩ
40MΩ 10KΩ
Open Circuit Voltage: ~0.25V
Overload Protection: 250V DC/AC rms

Diode and Continuity
Range Description 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 50Ω and 100Ω, the buzzer may sound or
may not sound. When the resistance is more than 100Ω, the buzzer will not sound.
Capacitance
Range Resolution Accuracy
40nF 10pF ± (8% of rdg + 10 dgts)
400nF 100pF
± (5% of rdg + 5 dgts)
4uF 1nF
40uF 10nF
100uF~2mF 100nF
Frequency
Range Accuracy
5/50/500/5K
50K/500K/5MHz
± (1.0% of rdg + 3dgts)

OPERATION INSTRUCTIONS
Measuring Voltage
1. Connect the black test lead to the “COM” Terminal and the red test lead to the “INPUT”
terminal.
2. Set the function switch to V~ or V⎓ range. Select Auto or Manual range with the
“RANGE” button.
3. In manual range, if the voltage magnitude to be measured is not known beforehand, set
the ranges switch to the highest range position and then reduce it range by range until
satisfactory resolution is obtained.
4. Connect the test leads across the source or load to be measured.
5. Results are displayed on the LCD display. The polarity of the red lead connection will be
indicated when making a DC measurement.
Note:
a. In small ranges, 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 results.
b. In manual range mode, when the meters show the Overload symbol, “OL”, a higher
range must be selected.
c. To avoid damage to the meter, do not measure a voltage which exceeds 600V DC (for
DC voltage measurement) or 600V AC (for AC voltage measurement).
Measuring Current
1. Connect the black test lead to the “COM” jack. If the current to be measured is less than
200mA, connect the red test lead to the “INPUT” jack. If the current is between 200mA
and 10A, connect the red test lead to the “10A” jack instead.
2. Set the range switch to desired “µA≂”, “mA≂”, or “A≂” range.
If the current magnitude to be measured is not known beforehand, set the ranges switch
to the highest range position and then reduce it range by range until satisfactory
resolution is obtained.
3. Select DC current measurement or AC current measurement with the “Select” Button.
4. Select auto range or manual range with the “Range” button. In manual range, if the
current magnitude to be measured is not known beforehand, select the highest range.
5. Connect test leads in series with the circuit to be measured.
6. Results are displayed on the LCD display. For DC current measurement, the polarity of
the red test lead connection will be indicated as well.
Note:
a. When the display shows the Overload symbol “OL”, a higher range must be selected.
Measuring Resistance
1. Connect the black test lead to the “COM” jack and the red to the “INPUT” jack (Note:
The polarity of the red test lead is positive “+”).
2. Set the range switch to “ ”position.
3. Set the “Select” button to “ ” range.
4. Select auto range or manual range with the “Range” button. In manual range, if the
current magnitude to be measured is not known beforehand, select the highest range.
5. Connect the test leads across the load to be measured.
6. Results are displayed on the LCD display.
Note:
a. For resistance measurements >1MΩ, the meter may take a few seconds to stabilize
reading. This is normal for high-resistance measurement.

b. When the input is not connected, i.e. at open circuit, the symbol “OL” will be displayed as
an over range indicator.
c. Before measuring in-circuit resistance, be sure that the circuit under test 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 to the “INPUT” jack (Note:
The polarity of the red test lead is positive “+”).
2. Set the range switch to “ ” position
3. Press the “Select” Button to select continuity measurement mode, and the symbol “ ”
will appear as an indicator.
4. Connect the test leads across the load to be measured.
5. 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 to the “INPUT” jack (Note:
The polarity of the red test lead is positive “+”).
2. Set the range switch to “ ” position.
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 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.
Capacitance Measurement
1. Connect the black test lead to the COM jack and the red to the “INPUT” jack.
2. Set the range switch to “ ”position
3. Press the “Select” Button to select continuity measurement mode, and the symbol “mF”
will appear as an indicator.
4. Connect test leads across the capacitor under measure and be sure the polarity of
connection is observed.
Note:
a. When the capacitance under measure is above 100uF, it needs at least 10 seconds to
make readings stable.
Measuring Temperature
1. Set the range switch to “℃” or “℉” range.
2. Insert the black (or “-“) plug of the K type thermocouple to the “COM” jack, and the red
(or “+”) plug to the “INPUT” jack.
3. Carefully touch the end of the thermocouple to the object to be measured.
4. The results will be displayed after several moments.
Measuring Frequency/Duty Cycle
1. Connect the black test lead to the COM jack and the red to the “INPUT” jack.
2. Set the range switch to “Hz/Duty Cycle” range.
3. Press the “Select” Button to select “Hz” or “duty cycle” mode

4. Connect test leads across the source or load under measurement.
Note:
a. The input voltage should be between 200mV and 10V rms AC. If the voltage is more
than 10V rms, reading may be out of the accuracy range.
BATTERY REPLACEMENT
If the low battery icon appears on the display, it indicates the battery should be replaced
immediately. Remove the screws on the back of the meter and open the back of the case.
Replace the empty battery with new batteries (3 x AAA, 1.5V)
ACCESSORIES
User Manual, Test Leads, Thermocouple Adapter
FUSE REPLACEMENT
Fuses rarely need to be replaced and is blown almost as a result of operator error. This meter
uses a fuse: F1:500mA/600V and F2: 10A/600V fast action. To replace the fuses, open the
meter back cover, replace the damaged fuse with a new fuse of the specified ratings. Then
reinstall the battery cover and lock the cover.
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 or 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 [e-mail].