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Pocket size digital multimeter

MS8221

Users Manual

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Summary of Contents for MS8221

Page 1: ...Pocket size digital multimeter MS8221 Users Manual ...

Page 2: ... 1 4 MAINTENANCE 7 2 DESCRIPTION 7 3 SPECIFICATIONS 9 3 1 GENERAL SPECIFICATIONS 9 3 2 Measurement specifications 10 3 2 1 DC VOLTAGE 11 3 2 2 AC VOLTAGE 11 3 2 3 DC CURRENT 12 3 2 4 AC Current A B D model 12 3 2 5 Resistance 13 3 2 6 Diode test 13 3 2 7 Audible continuity test 13 ...

Page 3: ...rement 15 4 2 Current measurement 15 4 3 Resistance measurement 17 4 4 Diode test 17 4 5 Continuity test 18 4 6 Temperature measurement 18 Only C model 18 4 7 Battery test only D model 19 4 8 Transistor measurement only B model 20 5 MAINTENANCE 20 5 1 General Maintenance 20 5 2 Fuse replacement 21 5 3 Battery replacement 22 ...

Page 4: ...ry CAT III 600V and pollution 2 Follow all safety and operating instructions to ensure that the meter is used safely and is kept in good operating condition With proper use and care the digital meter will give you years of satisfactory service 1 1 PRELIMINARY When using the meter the user must observe all normal safety rules concerning Protection against the dangers of electrical current Protectio...

Page 5: ...same electric ratings 1 2 DURING USE Before using you must select the right input jack function and range Never exceed the protection limit values indicated in specifications for each range of measurement When the value scale to be measured is unknown beforehand set the range selector at the highest position Do not measure voltage if the voltage on the terminals exceeds 600V above earth ground Alw...

Page 6: ...e meter can not be used any more and it has to be checked out Never use the meter unless the rear case is in place and fastened fully Please do not store or use meter in areas exposed to direct sunlight high temperature humidity or condensation 1 3 SYMBOL Caution refer to the instruction manual Incorrect use may result in damage to the device or its components Earth This instrument has double insu...

Page 7: ...e meter displays you must change the battery For continue protection against fire replace fuse only with the specified voltage and current ratings F 250mA 600V quick acting 10A 600V quick acting Do not use abrasives or so5lvents on the meter use a damp cloth and mild detergent only Always set the power switch to the OFF position when the meter is not in use If the meter is to be stored for a long ...

Page 8: ...ent Overload protection and low battery indication are provided this meter is ideal for use in the fields workshop school hobby and home applications This meter is with the functions of data hold NAME OF COMPONENTS 1 LCD display 2 Hold key 3 Rotary switch 4 Terminals ...

Page 9: ...NS 3 1 GENERAL SPECIFICATIONS Environment conditions 600V CAT III Pollution degree 2 Altitude 2000 m Operating temperature 0 40O C 32 to 104 80 RH non condensing Storage temperature 10 50 O C 14 to 122 70 RH battery ...

Page 10: ... 2 3 sec Over Range indication LCD will display 1 Low battery indication The is displayed on the LCD Polarity indication displayed automatically Power source 9V Battery type 6F22 9V Dimensions 158 L 74 W 40 H mm Weight 220g Approx battery included 3 2 Measurement specifications Accuracy of reading number of digits at 18 C to 28 C 64 F to 82 F with relative humidity to 80 Accuracy is specified for ...

Page 11: ...8 2 0 8 5 Input impedance A B D model 10MΩ C model 1MΩ Max input voltage 200mV range 250VDC or AC rms 2V 600V ranges 600VDC or 600V rms 3 2 2 AC VOLTAGE Range Resolution Accuracy A B D model C model 2V 1mV 0 8 4 20V 10mV 200V 0 01V 1 2 5 600V 1V 1 2 3 Input impedance A B D model 10MΩ C model 1MΩ Max input voltage 200mV range 250VDC or AC rms ...

Page 12: ...odel 200uA 0 1uA 0 8 2 NULL NULL 2mA 1 uA 0 8 2 1 5 2 20mA 10 uA 200mA 100uA 1 2 2 10A 10mA 2 0 5 3 0 2 Overload protection F250mA 600V 10A 600V Max Input Current mA Jack 200mA 10A Jack 10A 3 2 4 AC Current A B D model Range Resolution Accuracy 2mA 1µA 1 2 3 20mA 10µA 200mA 0 1mA 2 0 3 10A 10mA 3 0 7 Overload protection F250mA 600V 10A 600V Max input current mA 200mA dc or 200mA ac rms 10A 10A 15 ...

Page 13: ... 2 20KΩ 10Ω 200KΩ 100Ω 2MΩ 1kΩ 20MΩ 10kΩ 1 0 2 Overload protection 250V DC or 250V AC rms 3 2 6 Diode test Display read approximate forward voltage of diode Forward DC Current approx 1mA Reversed DC Voltage approx 2 8V Overload protection 250V DC or 250V AC rms 3 2 7 Audible continuity test Built in buzzer sounds if resistance is less than approx 50Ω 0 8 2 1 0 2 ...

Page 14: ...ue 0 1000 of transistor under test all type Base Current approx 10μA Vce approx 2 8V 3 2 9 Temperature Only C model Range Resolution Accuracy 20 to 0 5 0 4 0 to 400 1 1 0 3 400 to 1000 2 0 3 Overload Protection 250V DC or rms AC 3 2 10 Battery Test Only D model Range Accuracy Discharge current 1 5V 0 8 2 100mA 9V 6mA Overload protection 1 5V F250mA 600V fuse 9V 250Vdc or 250Vac rms ...

Page 15: ...ted when making a DCV measurement When only the figure 1 is displayed it indicates overrange situation and the higher range has to be selected To avoid electrical shock and or damage to the instrument do not attempt to take any voltage measurement that might exceeds 600Vdc or 600Vac rms Do not apply more than 600Vdc or 600Vac rms between the common terminal and the earth ground 4 2 Current measure...

Page 16: ...icates overrange situation and the higher range has to be selected C model don t have ACA measurement function To avoid damage to the meter use the proper terminals function and range for your measurement NOTE When only the figure OL is displayed it indicates overrange situation and the higher range has to be selected When the value scale to be measured is unknown beforehand set the range selector...

Page 17: ...age capacitors before measuring resistance NOTE For measuring resistance above 1MΩ the meter may take a few seconds to stabilize reading This is normal for high resistance measuring If the resistance being measured exceeds the maximum value of the range selected or the input is not connected an overrange indication 1 will be displayed 4 4 Diode test Set the rotary switch to range Connect the black...

Page 18: ...ary switch to range Connect the black and red test leads to the COM and Ω terminals respectively Connect the test leads to the resistance in the circuit being measured When the test lead to the circuit is below 50Ω a continuous beeping will indicate it To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before testing for Con...

Page 19: ...re sensor to the area or surface of the object for measurement You can get reading from LCD To avoid electrical shock do not connect the thermocouples with the electriferous circuit 4 7 Battery test only D model Set the rotary switch to desired BATT range Connect the black and red test leads to the COM and VΩ terminals respectively Connect the test leads across the battery terminals under measurem...

Page 20: ...tested is NPN or PNP type and locate the Emitter Base and Collector leads Insert leads of the transistor into proper holes of the hFE socket The meter will show the approx hFE value at test condition of base current 10μA and Vce 2 8V 5 MAINTENANCE 5 1 General Maintenance Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents Dirt or moisture in the termina...

Page 21: ... 5 2 Fuse replacement To replace the Meter s fuse see the Figure Set the rotary switch to OFF range Disconnect test leads from any inputs terminals Use a screwdriver to unscrew the 5 screws secured on the back casing Separate the back casing from the top casing Replace the fuse only with specified ratings F 250mA 600V F 10A 600V Replace the back casing and secure by the 5 screws Before replacing t...

Page 22: ...ew the two screws secured on the battery cover and remove the battery cover Replace the battery with three new 9V battery 6F22 Reinstall the battery cover and secure by the two screws Before replacing the battery disconnect test leads from any circuit under test turn the meter off and remove test leads from the input terminals ACCESSORIES Test Leads one set Battery 9V 6F22 three pieces Instruction...

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Page 24: ...s appliance in an environment with a strong radiated radio frequency electromagnetic field approx 3V m may influence its measuring accuracy The measuring result can be strongly deviating from the actual value MS8221 09 ...

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