mercury MTM01 Digital Multimeter User Manual

mercury MTM01 Digital Multimeter User Manual

Please read this manual thoroughly and ensure all contents are fully

understood before using the apparatus.

Warning

To avoid possible electric shock or personal injury, and to avoid possible damage to the tester or to the equipment under test, adhere to these following rules:

• Before using the tester inspect the case. Do not use the tester if it is damaged or the case (or part of the case) is removed. Look for cracks or missing plastic. Pay 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 tester, between the terminals or between any terminal and grounding.
• The rotary switch should be in the right position and no changeover of range shall be made while measurement is conducted to prevent damage.
• When the tester is working at an effective voltage over 60V in DC or 30Vrms in AC, special care should be taken for there is danger of electric shock.
• Use the proper terminals, function, and range for your measurements.
• Do not use or store the tester in an environment of high temperature, humidity, explosive, flammable, damp or of a strong magnetic field. The performance of the tester may deteriorate after being exposed to any of these elements.
• 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, diodes.F
• Replace the battery as soon as the battery indicator appears. With a low battery, the meter may 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.
• The internal circuit of the meter shall not be altered at will to avoid damage of the meter and any accident.
• A soft cloth and mild detergent should be used to clean the surface of the tester on a regular basis. No abrasive and solvent should be used to prevent the surface of the tester from corrosion or damage.
• The tester is suitable for indoor use only.
• Turn the tester power off when it is not in use and take out the battery when not using for a long time. Check the battery regularly; replace the battery immediately if any signs of leaking appear. Battery acid will damage the tester.

General Specifications

Max display:                             LCD (1999 count) 67 x 42mm
Polarity:                                   Automatic, indicated minus, assumed plus Measure method:      double integral A/D switch implement Sampling speed:                   2 times per second
Over-load indication:              “1” is displayed Operating Environment: 0ºC-40ºC, at <80%RH Storage Environment:                          -10ºC-50ºC, at <85%RH
Power:                                     9Vdc (1 x PP3 battery supplied)
Low battery indication:            “ ”
Dimensions:                            190 x 90 x 33mm
Weight:                                   190g (including battery)

Multimeter comparison table

Technical Specifications

±(0.8% of rdg + 5D)

20V| 10mV
200V| 100mV
600V| 1V| ±(1.0% of rdg + 5D)

Input Impedance: 10MΩ
Overload Protection: 1000V DC or 750V AC rms Max. Input voltage: 1000V DC

AC Voltage

Input Impedance: 10M Ω Frequency Range: 40Hz ~ 400Hz
Overload Protection: 1000V DC or 750V AC rms Response: Average, calibrated in rms of sine wave Max. Input voltage: 750V AC rms

Audible Continuity

circuit voltage: about 2.8V
****| The approximate forward voltage drop will be displayed| Open circuit voltage: about 2.8V

Overload Protection: 250V DC/AC rms

DC Current

Overload Protection: mA: F0.5A/600V fuse 10A: F10A/600V fuse Voltage Drop: 200mV

AC Current

Overload Protection: mA: F0.5A/600V fuse (DT9205A, DT9207A, DT9208A) 10A: F10A/600V fuse
Voltage Drop: 200mV
Frequency Range: 40Hz ~ 400Hz
Response: Average, calibrated in rms of sine wave

Resistance

±(1.0% of rdg + 4D)

20kΩ| 10Ω
200kΩ| 100Ω
2MΩ| 1kΩ
20MΩ| 10kΩ| ±(1.0% of rdg + 10D)
200MΩ| 100kΩ| ±[5%*(rdg-10) + 10D)

Open Circuit Voltage: about 3V Overload Protection: 250V DC/AC rms

Capacitance

±(4.0% of rdg + 5D)

20nF| 10pF
200nF| 100pF
2uF| 1nF
20uF| 10nF

Overload Protection: F0.5A/600V fuse Over-load protect: 250V DC/AC rms

OPERATING INSTRUCTIONS VOLTAGE MEASUREMENT

1. Connect red test lead to “VΩ” jack, black lead to “COM” jack.
2. Set RANGE switch to desired VOLTAGE position, if the voltage to be measured is not known beforehand, set switch to the highest range and reduce it until satisfactory reading is obtained.
3. Connect test leads to device or circuit being measured.
4. Turn on power of the device or circuit being measured voltage value will appear on Digital Display along with the voltage polarity.

Please note:

• In small range, 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.
• When the meter shows the over range symbol “1”, a higher range must be selected.
• To avoid damage to the meter, don’t measure a voltage which exceeds 600Vdc (for DC voltage measurement) or 600Vac (for AC voltage measurement).

CURRENT MEASUREMENT

1. For reading less than 200mA connect red lead to “mA” and black lead to “COM” (for measurements between 200mA and 10A, connect red lead to “10A”) ensure jacks are fully depressed.
2. Set the range switch to desired AC or DC position. 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. Open the circuit to be measured and connect test leads in SERIES with the load in with current is to measure.
4. Current reading will be displayed on LCD, for DC current measurement, the polarity of the red probe will also be indicated. Please note:
   When the display shows the over range symbol “1”, a higher range must be selected. In addition “10A” function is designed for intermittent use only.

RESISTANCE MEASUREMENT

1. Connect red lead to “VΩ”, black lead to “COM”.
2. Set the range switch to desired Ω range.
3. If the resistance being measured is connected to a circuit, turn off power and discharge all capacitors before measurement.
4. Connect test leads to circuit being measured.
5. Read resistance value on Digital Display.

Please note:

• For resistance measurements >1MΩ, the meter may take a few seconds to stabilize reading. This is normal for high-resistance measurement.
• When the input is not connected, i.e. at open circuit, the symbol “1” will be displayed as an over range indicator.

CAPACITY MEASUREMENT

1. Connect the BLACK test lead to the COM jack and the RED to the mA jack.
2. Set the Range switch at F position. (NOTE: The polarity of the RED lead is positive “+”)
3. Connect test leads across the capacitor under measure and be sure the polarity of connection is observed. Please Note:
   To avoid damage to the Meter, disconnect circuit power and discharge all high- voltage capacitors before measuring capacitance. The tested capacitor should be discharged before the testing procedure. Never apply voltage to the input, or serious damage may result.

CONTINUITY TEST

1. Connect the BLACK test lead to the “COM” jack and the RED to the “VΩ” jack (Note: The polarity of the red test lead is positive “+”).
2. Set the range switch to range
3. Connect the test leads across the load to be measured.
4. If the circuit resistance is lower than about 30±20Ω, the built-in buzzer will sound.

DIODE MEASUREMENT

1. Connect red lead to “VΩmA”, black lead to “COM”.
2. Set RANGE switch to   position.
3. Connect the red test lead to the anode of the diode to be measured and black test lead to cathode.
4. The meter will show the approximate forward voltage of the diode. If the connections are reversed, “1” will be shown on the display.

TRANSISTOR hFE MEASUREMENT

1. Set the range switch to hFE range.
2. Connect the adapter to the “COM” jack and the “hFE” jack. Don’t reverse the connection.
3.  Identify whether the transistor is NPN or PNP type and locate Emitter, Base and Collector lead. Insert the leads of the transistor to be tested into the proper holes of the transistor test socket of the adaptor.
4.  LCD display will show the approximate hFE value.

BATTERY AND FUSE REPLACEMENT

1. Battery and fuse replacement should only be done after the test leads have been disconnected and power is off.
2. Loosen screws with suitable screwdriver and remove case bottom.
3. The meter is powered by a single 9V PP3 battery. Snap the battery connector leads to the terminals of a new battery and reinsert the battery into the case top. Dress the battery leads so that they will not be pinched between the case bottom and case top.
4. The meter is protected by fuse: A) mA: F0.5A/600V Fast, Breaking capacity is 10KA, dimensions are 20 x 5mmØ.
   B) 10A: F10A/600V Fast, Breaking capacity is 10KA, dimensions are 20 x 5mmØ.

Replace the case bottom and reinstall the three screws. Never operate the meter unless the case bottom is fully closed.

ACCESSORIES

• Instruction manual
• Set of test leads (red and black)
• 9V PP3 battery

EN61010–1:2010

This product is classed as Electrical or Electronic equipment and should not be disposed with other household or commercial waste at the end of its useful life. The goods must be disposed of according to your local council guidelines.
Errors and omissions excepted.
Copyright© 2021 AVSL Group Ltd, Unit 2 Bridgewater Park,
Taylor Road, Trafford Park, Manchester. M41 7JQ.
AVSL (Europe) Ltd, Unit 3D North Point House,
North Point Bus. Park, New Mallow Road, Cork, Ireland.

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