Mastech MS8221 User's Manual CONTENTS 1. SAFETY INFORMATION…………………………….1 2. DESCRIPTION………………………………………..4 3. SPECIFICATIONS…………………………………….6 4. OPERATING INSTRUCTION………………………..9 4.1 Voltage measurement…………………….……..10 4.2 Current measurement……………………………10 4.3 Resistance measurement…………………….....12 4.4 Diode test………………………………………….12 4.5 Continuity test…………………………………….13 4.6 Temperature measurement……………………...13 4.7 Battery test………………………………………..14 4.8 Transistor measurement…………………………14 5. MAINTENANCE………………………….
1. SAFETY INFORMATION WARNING To ensure safe operation, and in order to exploit to the full the functionality of the meter, please follow the directions in this section carefully. This multimeter has been designed according to IEC-1010 concerning electronic measuring instruments with an overvoltage category CAT II 1000V, 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.
verify that the insulation on test leads is not damaged and/or the leads wire is not exposed. - Full compliance with safety standards can be guaranteed only if used with test leads supplied. If necessary, they must be replaced with the same model or 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.
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 insulation. Fuse: F 200mA/250V 1.
battery. - For continue protection against fire, replace fuse only with the specified voltage and current ratings: F 200mA/250V (quick acting). - Do not use abrasives or solvents 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 period of time, the batteries should be removed to prevent damage to the unit. 2.
4. hFE socket (except MS8221D) 5.
3. SPECIFICATIONS 3.1 GENERAL SPECIFICATIONS - Environment conditions: 600V CAT.III and 1000V CAT.Ⅱ Pollution degree: 2. Altitude < 2000 m. - Operating temperature: 0~40OC (32℉ to 104℉), (<80% RH, non-condensing) - Storage temperature: -10~50 OC(14℉ to 122℉), (<70% RH, battery removed) - Temperature Coefficient: 0.1×(specified accuracy) / OC (<18 OC or >28 OC) - MAX. Voltage between terminals and earth ground: 750V AC rms or 1000V DC - Fuse Protection: mA: F 200mA/250V ∅5×20, 10A: unfused.
(Accuracy is specified for a period one year after calibration) 3.2.1 DC VOLTAGE Range Resolution Accuracy MS8221A/8221D MS8221B/8230B 0.2V 0.1mV ±0.5%±2 2V 1mV ±0.5%±3 ±0.5%±1 20V 0.01V ±0.8%±3 200V 0.1V 1000V 1V ±0.8%±2 ±0.8%±5 - Input impedance: MS8221A/MS8221D: 10MΩ MS8221B/MS8230B: 1MΩ - Max. input voltage: 200mV range: 250VDC or AC rms 2V - 1000V ranges: 1000VDC or 750V rms 3.2.2 AC VOLTAGE Range Resolution Accuracy MS8221A/8221D MS8221B/8230B 2V 1mV ±0.8%±3 20V 10mV 200V 0.01V ±1.
3.2.3 DC CURRENT Range Resolution Accuracy MS8221A/8221D MS8221B/8230B 200uA 0.1uA ±1.0%±2 ±0.8%±1 2mA 1 uA 20mA 10 uA ±1.5%±2 200mA 100uA ±1.2%±1 10A 10mA ±2.0%±5 ±3.0%±2 Overload protection: F250mA/250V fuse (10A range unfused). Max. Input Current: mA Jack: 200mA, 10A Jack: 10A 3.2.4 AC Current (MS8221A/MS8221D) Range Resolution Accuracy 2mA 1µA ±1.2%±3 20mA 10µA 200mA 0.1mA ±2.0%±3 10A 10mA ±3.0%±7 Overload protection:F250mA/250V fuse (10A range unfused). Max.
or 2µA (MS8221B/MS8230B). VCE: approx. 2.8V 3.2.6 Resistance Accuracy Range Resolution -8MS8221A/8221D MS8221B/8230B 200Ω 0.1Ω ±0.8%±3 ±1.0%±3 2KΩ 1Ω 20KΩ 10Ω ±0.8%±1 ±1.0%±2 200KΩ 100Ω 2MΩ 1kΩ 20MΩ 10kΩ ±1.0%±2 Overload protection: 250V DC or 250V AC rms. 3.2.7 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.
400℃ to 1000℃ ±2.0%±3 - Overload Protection: 250V DC or rms AC 3.2.10 Battery Test (Only MS8221D) Range Accuracy Discharge current -91.5V 100mA ±0.8%±1 9V 6mA Overload protection: 1.5V: F250mA/250V fuse 9V: 250Vdc or 250Vac rms 4. OPERATING INSTRUCTION 4.1 Voltage measurement or V~ range. - Set rotary switch to the desired V - Connect the black and red test leads to the COM and V terminals respectively. - Connect the test leads to the circuit being measured - Read the displayed value.
4.2 Current measurement - Set the rotary switch to the desired A or A~ range. - Connect the black test lead to the COM terminal and the red test leads to the mA terminal for a maximum of 200mA. For a maximum- 10 of -10A, move the red test lead to the 10A terminal. - Connect test leads in series with the load in which the current is to be measured. - Read the displayed value. The polarity of red test lead connection will be indicated when making a DCA measurement.
maximum current is 10A, no fuse protection. 4.3 Resistance measurement - Connect the black test lead to the COM jack and the - 11 red test lead to the Ω jack. - Set the transform switch at the Ω range position. - Connect test leads across the resistance under measurement. - You can get reading from LCD. To avoid electrical shock and/or damage to the instrument, disconnect circuit power and discharge all high-voltage capacitors before measuring resistance.
diode. If the lead connection is reversed, only figure "1" displayed. To avoid electrical shock and/or damage to the instrument, disconnect circuit power and discharge all high-voltage capacitors before testing diodes. 4.5 Continuity test - Set the rotary 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.
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 MS8221D) - 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 measurement. - Read LCD display and determine if the battery is OK. 4.
5. MAINTENANCE 5.1 General Maintenance- 14 Periodically wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Dirt or moisture in the terminals can affect readings. To clean the terminals: ¥ Turn the meter off and remove all test leads. ¥ Shake out any dirt that may be in the terminals. ¥ Soak a new swab with a cleaning and oiling agent (such as WD-40). ¥ Work the swab around in each terminal. The oiling agent insulates the terminals from moisture-related contamination.
Before replacing the fuse, disconnect test leads from any circuit under test. To prevent damage or injury, replace the fuse only with specified ratings. 5.3 Battery replacement To replace the battery (see the Figure): - When the battery voltage drop below proper operation symbol will appear on the LCD display range the and the battery need to be replaced. - Turn the meter off and remove all test leads. - Use a screwdriver to unscrew the two screws secured on the battery cover, and remove the battery cover.
CAUTION Using this 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.
