Mastech MS8221C User Manual
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Mastech MS8221C User Manual

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DIGITAL MULTIMETER
USER'S MANUAL
MS8221C
CONTENTS
1. Safety Information
1.1 Preliminary
2.
2.1
3.1
3.2
4.
4.2
1
1
2
3
4
4
5
6
6
6
7
12
12
12
13
13
13
13

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Summary of Contents for Mastech MS8221C

  • Page 1: Table Of Contents

    MS8221C CONTENTS DIGITAL MULTIMETER 1. Safety Information USER'S MANUAL 1.1 Preliminary 1.2 During use 1.3 Symbols 1.4 Maintenance Description Names of Components 2.2 Switch, Buttons and Input Jack Elucidation 3. Specifications General specifications Electrical specifications Operating Instruction 4.1 Power -up Data Hold 4.3 Maximum Hold...
  • Page 2 1.Safety Information CONTENTS WARNING 4.7 Auto Power Off To ensure safe operation, and in order to exploit 4.8 Preparation for Measurement to the full the functionality of the meter, please 4.9 DC Voltage Measuring follow the directions in this section carefully. 4.10 AC Voltage Measuring 4.11 DC Current Measuring This multimeter has been designed according to...

  • Page 3: During Use

    1.2 During Use 1.2.12 Never use the meter unless the rear case is in place and fastened fully. 1.2.1 Before using, you must select the right input jack, 1.2.13 Please do not store or use meter in areas function and range. exposed to direct sunlight, high temperature, 1.2.2 Never exceed the protection limit values indicated humidity or condensation.

  • Page 4: Maintenance

    1.4 Maintenance - This meter has function of auto range and manual range. 1.4.1 Please do not attempt to adjust or repair the - This meter has function of auto power off. meter by removing the rear case while voltage - This meter is with the functions of data hold and is being applied.

  • Page 5: Switch, Buttons And Input Jack Elucidation

    2.2 Switch, BUTTONS and Input Jack Elucidation 3.1.3 Fuse Protection: F 200mA/250V (quick acting). 3.1.4 Operating Altitude: 2000 meters (7000 ft.) • ON/OFF Button maximum This Button is used to the switch of power. 3.1.5 Display: 16mm LCD • RANGE Button 3.1.6 Max.
  • Page 6 - Overload Protection: 200mV range: 250V DC or AC - Voltage Drop：200µA、20mA、2A: 20mV, 2000µA、 rms, 2V-600V ranges: 600V DC or AC rms. 200mA、10A range: 200mV - Max. Input Voltage: 600V DC 3.2.4 AC Current 3.2.2 AC Voltage Range Accuracy Resolution Range Accuracy Resolution...
  • Page 7 3.2.6 AC Current (with clamp, optional) 3.2.8 Temperature Range Accuracy Resolution Range ˚C to 1000 ˚C ±(1.5 % of rdg Resolution 1˚C meter 0.1mV/0.1A 200A +5 digits) ±(5% of rdg + 4digits) ˚C to 0 ˚C Typical AC Clamp Accuracy ±(1% of rdg + 3digits) 0.1A /0.1mV ˚C...

  • Page 8: Operating Instruction

    4.3 Maximum Value Hold 3.2.10 Diode If you need data hold when measuring, you can put on Range Resolution Function ‘MAX.H’ button, it will hold the maximum value; if you Display :read approximate put the button again, maximum value hold is not continue. forward voltage of diode 4.4 Function Transform - Forward DC Current: approx.

  • Page 9: Auto Power Off

    When the battery voltage is less than 4V, it will show ‘ ’. 4.8.4 When connection, first connect to the public testing But if you use back light at the same time, maybe ‘ ’ line, then to the electriferous testing line. When will come up even if the battery voltage is more than 4V, you'll remove it, you should remove the because the working current is higher and the voltage...
  • Page 10 • At the manual range mode, when the value scale to 4.10 Measuring AC Voltage be measured is unknown beforehand, set the range selector at the highest position. WARNING You can't input the voltage which more than 600V rms AC, it's possible to show higher voltage, but it's may destroy the inner circuit.
  • Page 11 4.11 Measuring DC Current WARNING Shut down the power of the tested circuit, then connect the meter with the circuit for measurement. 4.11.1 Connect the black test lead to the COM jack and the red test lead to the INPUT jack for a maximum of 200mA current.

  • Page 12: Dc Current Measuring (With Clamp, Optional)

    Note: • When the value scale to be measured is unknown beforehand, set the range selector at the highest • When only the figure 'OL' is displayed, it indicates position. overrange situation and the higher range has to be • ‘...
  • Page 13 • At the manual range mode, when only the figure 'OL' is displayed, it indicates overrange situation and the higher range has to be selected. • At the manual range mode, when the value scale to be measured is unknown beforehand, set the range selector at the highest position.

  • Page 14: Ac Current Measuring (With Clamp, Optional)

    4.14 AC Current Measuring (With Clamp, higher than the measured value. For example, the Optional) measured current is 10A, then the indicated value will be 100.0A. 4.14.1 Connect the black output lead of clamp to the COM jack and the red one to the INPUT jack of the meter.
  • Page 15 4.15 Measuring Resistance WARNING When measuring in-circuit resistance, be sure the circuit under test has all power removed and that all capacitors have been discharged fully. 4.15.1 Connect the black test lead to the COM jack and the red test lead to the INPUT jack. 4.15.2 Set the transform switch at the Ω...
  • Page 16 4.16 Measuring Temperature WARNING To avoid electrical shock, do not connect the thermocouples with the electriferous circuit. 4.16.1 Set the transform switch at the TEMP range position. 4.16.2 ˚C range or ˚F range can be transformed by putting the 'FUNC.'. 4.16.3 The LCD display will show the current environment temperature.
  • Page 17 4.17 Measuring Capacitance WARNING To avoid electrical shock, be sure the capacitance have been discharged fully before measuring the capacitance of a capacitor 4.17.1 Connect the black test lead to the COM jack and the red test lead to the INPUT jack. 4.17.2 Set the transform switch at the desired nF, 20μF or 2000μF range position.
  • Page 18 4.18 Testing Diode Note: 4.18.1 Connect the black test lead to the COM jack and • The meter will show the approximate forward voltage drop of the diode. the red test lead to the INPUT jack. (The polarity • If the lead connection is reversed, only figure 'OL' will of red lead is '+') be displayed.
  • Page 19 4.20 Testing Transistor 4.20.1 Set the transform switch at the hFE range position. 4.20.2 Put two plugs '-' and '+' of multifunction test socket into COM jack and INPUT jack respectively. 4.20.3 Identify whether the transistor is NPN or PNP type and insert emitter, base and collector leads into the proper holes of the transistor on the multifunction test socket for testing.

  • Page 20: Maintenance

    5.2.2 Loosen the fixing screw of the battery cover 5. Maintenance and remove it. 5.2.3 Replace the blown fuse with ratings specified. 5.1 Replacing The Batteries 5.2.4 Put the battery cover as its origin. WARNING 5.3 Replacing Test Leads To avoid electric shock, make sure that the test Replace test leads if leads become damaged or worn.

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