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1

Used for AC and DC current measurement (maximum 10A), input socket for 

frequency/duty ratio measurement (frequency measurement in current mode); 

when testing transistor, multi function test socken “IN” input socket.

2

Used for AC and DC microampere (µA) and milliampere (mA) measurement 

(maximum 600mA) and input socket for frequency/duty ratio (frequency 

measurement in current mode); when testing transistor, multi-function test 

socket “COM” input socket.

3

Used as common terminal for all measurement; negative input socket of K-type 

thermocouple temperature measurement.

4

Input socket for voltage, resistance, connectivity, diode, capacitance, frequency, 

duty ratio measurement; positive input socket of K-type thermocouple 

temperature measurement.

MEASUREMENT OPERATION
Manual and Automatic Range

• 

In auto ranging mode, the instrument will select the best range for the input signal 

to be detected. The user does not need to select a range when changing the 

measured signal.

• 

The instrument can also be set to manual ranging.

• 

The default mode, when the instrument is turned on or after the function is 

changed, is automatic range. The instrument displays the “AUTO” symbol.

To enter or exit manual ranging, perform the following steps:

• 

In automatic ranging mode, press the RANGE button, the “AUTO” symbol will 

disappear from the display.

• 

Press the RANGE button to increase the range. When the maximum range is 

reached, the instrument will return to the minimum range.

• 

Press and hold the RANGE button for two seconds to exit manual ranging mode. 

The instrument will display the “AUTO” symbol.

Note: Duty ratio, connectivity, diode, temperature and transistor measurement functions 

only have a single range.

Relative Value Measurement

The instrument is equipped with relative value measurement function. In this mode, the 

instrument display value = actual value - set reference value. Operations of entering or 

quitting relative measurement are as follows:

• 

Set the instrument to the measurement function you need, connect the probes 

with a source of value which you wish to set as reference value, the instrument will 

display the measured value.

• 

Press REL/USB button and store the measured value as reference value, enter 

the relative measurement mode and the instrument will display the “REL” symbol.

• 

Measure, and the instrument will display “actual value-set reference value”.

• 

Then press REL/USB button and exit relative value measurement mode, the “REL” 

symbol will disappear from the display.

Note: frequency, duty ratio, diode, connectivity, temperature and transistor 

measurement has no relative value measurement mode.

Summary of Contents for D03122

Page 1: ...1 MODEL D03122 DIGITAL MULTIMETER WITH T RMS USB...

Page 2: ...9 Measure Resistance 10 Measure Connectivity 10 Measure Capacitance 10 Measure Diode 11 Measure Temperature 11 Measure Transistor 11 Auto Power Off Function 12 Backlight Function 12 Data Hold 12 Gener...

Page 3: ...ves masks and flame retardant clothes etc to prevent being injured by electric shock due to exposed hazardous live conductors When measuring connect the zero line or the ground line first then connect...

Page 4: ...6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 Auto power off 8 DC indicator 15 Max Min Value Measurement 2 Simulation bar indicating rapid change trend 9 Resistance Frequency Unit 16 USB Interface Open...

Page 5: ...on selections 1 OFF 2 AC or DC Voltage Press Func to switch 3 AC or DC Voltage mV Press Func to switch 4 Frequency duty ratio Press Hz to switch 5 Resistance diode connectivity capacitance Press Func...

Page 6: ...perform the following steps In automatic ranging mode press the RANGE button the AUTO symbol will disappear from the display Press the RANGE button to increase the range When the maximum range is reac...

Page 7: ...n except OFF Press and hold the REL USB button for more than 2 seconds and the instrument will display the USB symbol to show that the data transmission function is enabled Press and hold the REL USB...

Page 8: ...electric shock or personal injuries Do not apply voltage exceeding DC 1000V or AC 750V RMS between the common terminal and the earth otherwise it may cause damage to the instrument electric shock or...

Page 9: ...mage to the instrument or equipment please check the fuse before measurement and use the correct input socket MEASURE RESISTANCE Scroll the rotary knob to press the FUNC button and switch to resistanc...

Page 10: ...the measurement result on the screen WARNING Before measuring resistance connectivity capacitance or diode please turn off the power supply and discharge all the high voltage capacitors otherwise it...

Page 11: ...rwise it may cause the instrument damage electric shock or personal injuries Caution Do not fold the thermocouple wire into an acute angle Repeatedly bending the wire over a period of time may cause t...

Page 12: ...the use of the backlight then replace the battery immediately DATA HOLD In the process of measurement if a held reading is required press the button the displayed value on the screen will be held Pres...

Page 13: ...oint the reading will stabilize 11 Power Requirement 4 x 1 5V AA batteries Dimensions 204x94x57mm LxWxH Weight About 410g inluding batteries AC VOLTAGE Range Resolution Accuracy Input impedance 10M 60...

Page 14: ...easurement the instrument should be cooled down after twice of the measurement time then enter small current measurement RESISTANCE Range Resolution Accuracy Open circuit voltage about 0 25V Overload...

Page 15: ...range range the input current should be increased with the increase of the measured frequency Input protection A mA range F600mA 1000V ultra speed fuse 10A range F10A 1000V ultra speed fuse Note Comp...

Page 16: ...r Remove the old batteries and replace with new batteries of the same specification Ensure that the batteries are inserted correctly observing the plus and minus marks on both the batteries and compar...

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