Mastech MAS345 Operator'S Instruction Manual Download Page 7 | Manualshive

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2. DESCRIPTION

This meter is an autoranging professional measuring instrument. Digit reading is 3999
counts and the bar graph consists of 38 segments for LCD, capable of performing
functions:
-DC voltage measuring (Auto Ranging)
-AC voltage measuring (Auto Ranging)
-DC current measuring
-AC current measuring
-Temperature measuring
-Resistance measuring (Auto Ranging)
-Capacitance measuring
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Summary of Contents for MAS345

Page 1: ...OPERATOR S INSTRUCTION MANUAL AUTO RANGE DUAL DISPLAY CONFORMED IEC1010 DIGITAL MULTIMETER ...

Page 2: ...CONTENTS PAGE SAFETY INFORMATION DESCRIPTION OPERATING INSTRUCTION SPECIFICATIONS ACCESSORIES BATTERY AND FUSE REPLACEMENT 1 5 10 17 26 27 ...

Page 3: ...sure that the meter is used safely and is kept in good operating condition 1 1 PRELIMINARY When using the meter the user must observe all normal safety rules concerning Protection against the dangers of electrical current Protection of the meter against misuse Full compliance with safety standards can be guaranteed only if used with test leads supplied If necessary they must be replaced with the s...

Page 4: ...surement circuit do not touch unused terminals When the value scale to be measured is unknown beforehand set the range selector at the highest position Before rotating the range selector to change functions disconnect test leads from the circuit under test When carrying out measurements on TV or switching power circuits always remember that there may be high amplitude voltage pulses at test points...

Page 5: ...ways is careful when working with voltages above 60V dc or 30V ac rms Keep fingers behind the probe barriers while measuring 1 3 SYMBOLS Important safety information refer to the operating manual Dangerous voltage may be present Earth ground Double insulation Protection class II 3 ...

Page 6: ...e fuse only with the specified voltage and current ratings F 15A 250V If any faults or abnormalities are observed the meter can not be used any more and it has to be checked out Never use the meter unless the back cover is in place and fastened fully To clean the meter use a damp cloth and mild detergent only do not use abrasives of solvents on it 4 ...

Page 7: ...ng is 3999 counts and the bar graph consists of 38 segments for LCD capable of performing functions DC voltage measuring Auto Ranging AC voltage measuring Auto Ranging DC current measuring AC current measuring Temperature measuring Resistance measuring Auto Ranging Capacitance measuring 5 ...

Page 8: ...n or off When the switch is push the beeper will sound 2 2 DC AC OR Ω BUTTON This button is used to select DCV or ACV on voltage range DCA or ACA on current range Ω or on Ω range When the button is push the beeper will sound 2 3 R H BUTTON In auto range press this button to select manual range and R H symbol will appear on 6 ...

Page 9: ...ange mode When the R H button is pushed voltage ranges will change as 4V 40V 400V 1000V Or resistance ranges change as 40MΩ 4MΩ 400kΩ 40kΩ 4kΩ 400Ω 2 4 B L BUTTON Press this button to toggle back lit ON The screen of the meter will light Press the button again back lit turn off 7 ...

Page 10: ...d to the limits During use connect the black test lead to the COM jack and the red test lead as shown below FUNCTION RED LEAD CONNECTION INPUT LIMITS DCV ACV Ω mA 10A V Ω V Ω V Ω mA 10A 1000V dc or 750V rms ac 250V dc or rms ac 250V dc or rms ac 400mA dc or rms ac 10A dc or rms ac 8 ...

Page 11: ...6 FRONT PANEL DISPLAY ON OFF SWITCH TRANSISTOR TESTING SOCKET FUNCTION SWITCH CAPACITANCE OR TEMPERATURE TESTING SOCKET INPUT JACKS RS232C SOCKET B L BUTTON R H BUTTON DC AC OR Ω BUTTON 6 5 4 3 2 7 8 9 1 ...

Page 12: ...jack Set the function switch at V range and connect test leads across the source or load under measurement Push the DC AC button to select DCV or ACV measuring mode Push the R H button to select manual range Read LCD display The polarity of red test lead connection will be indicated when making a DC measurement 3 2 CURRENT MEASURING ...

Page 13: ...d push the DC AC button to select DCA or ACA measuring mode Connect test leads in series with the load in which the current is to be measured Read LCD display The polarity of red test lead connection will be indicated when making a DC measurement 3 3 RESISTANCE MEASURING 1 Connect the black test lead to the COM jack and the red teas lead to the V Ω jack NOTE The polarity of the red test lead conne...

Page 14: ... a few seconds to stabilize reading This is normal for high resistance measuring When the input is not connected i e at open circuit the figure OL will be displayed and full bar graph appears for the overrange condition When checking in circuit resistance be sure the circuit under test has all power removed and all capacitors fully discharged 3 4 CAPACITANCE MEASURING ...

Page 15: ...tor has been discharged fully WARNING Before attempting to insert capacitor for testing always be sure that test leads have been disconnected from any measurement circuits Components should not be connected to the capacitor socket when making voltage measurements with test leads 3 5 TEMPERATURE MEASURING 1 Set the function switch at TEMP range ...

Page 16: ... with the thermocouple probe 13 WARNING To avoid electric shock be sure the thermocouple has been removed before changing to another function measurement Before attempting to insert thermocouple for testing always be sure that test leads have been disconnected from any measurement circuits 3 6 AUDIBLE CONTINUITY TESTING ...

Page 17: ...ints of the circuit under measurement If continuity exists i e the resistance is lower than 30Ω built in buzzer will sound 3 7 DIODE TESTING 1 Connect the black test lead to the COM jack and the red test lead to the V Ω jack 14 2 3 NOTE The polarity of the red test lead connection is positive Set the function switch at position Connect the red test lead to the anode of the diode to be tested and t...

Page 18: ...PNP type and locate emitter base and collector lead Insert leads of the transistor into proper holes of the transistor testing socket on the front panel The meter will show the approx hFE value at test condition of base current 10μA and Vce 3 0V 15 WARNING Before attempting to insert transistor for testing always be sure that test leads have been disconnected from any measurement circuits ...

Page 19: ...2 Connect the RS232C cable between the meter and computer s serial ports Press ON OFF to turn on the meter Turn on the computer WARNING 1 Use only the type of serial interface cable RS232C cable exclusively designed 16 2 for your meter Never attempt to modify of extend the length or RS232C cable Please read this file of readme from Disks 4 SPECIFICATIONS ...

Page 20: ...t 18 to 28 64 F to 82 F with relative humidity to 75 4 1 GENERAL Max Voltage Between Terminals and Earth Ground 1000V dc or 750V rms ac sine Power Supply 9V NEDA1604 6F22 006P Ranging Method Auto Manual Display LCD 3999 counts max and bar graph consists of 38 segments 17 ...

Page 21: ...played Polarity Indication displayed automatically Low Battery Indication displayed Operating Temperature 5 to 35 41 F to 95 F Storage Temperature 10 to 60 14 F to 140 F Dimension 78mm 186mm 35mm Weight 300g Including battery 18 ...

Page 22: ...4 2 DC VOLTAGE Range Resolution Accuracy 4V 1mV 40V 10mV 400V 0 1V 0 5 of rdg 3 digits 1000V 1V 0 8 of rdg 3 digits Input Impedance 10MΩ 19 ...

Page 23: ... VOLTAGE Range Resolution Accuracy 4V 1mV 40V 10mV 400V 0 1V 1 2 of rdg 5 digits 750V 1V 1 5 of rdg 5 digits Input Impedance 10MΩ Frequency Range 40 to 400Hz Response Average calibrated in rms of sine wave 20 ...

Page 24: ...CE Range Resolution Accuracy 400Ω 0 1Ω 4kΩ 1Ω 40kΩ 10Ω 400kΩ 0 1kΩ 4MΩ 1kΩ 1 2 of rdg 3 digits 40MΩ 10kΩ 3 0 of rdg 5 digits Maximum Open Circuit Voltage 3 0V Overload Protection 250V dc or rms ac for all ranges 21 ...

Page 25: ...4 5 DC CURRENT Range Resolution Accuracy 4mA 1μA 400mA 0 1mA 1 2 of rdg 3 digits 10A 10mA 2 0 of rdg 8 digits Overload Protection F 15A 250V fuse for 10A range 22 ...

Page 26: ...ge Resolution Accuracy 4mA 1μA 400mA 0 1mA 1 5 of rdg 8 digits 10A 10mA 3 0 of rdg 8 digits Overload Protection F 15A 250V fuse for 10A range Frequency Range 40 to 400Hz Response Average calibrated in rms of sine wave 23 ...

Page 27: ...4 7 CAPACITANCE Range Resolution Accuracy 4nF 1pF 400nF 0 1nF 4 0 of rdg 5 digits 4 8 TEMPERATURE Range Resolution Accuracy 0 to 400 1 3 0 of rdg 3 digits 401 to 750 1 3 0 of rdg 5 digits 24 ...

Page 28: ...tion Description Built in buzzer will sound if resistance is lower than 30Ω 4 10 DIODE Function Resolution Test Current Open Circuit Voltage 1mV 25μA 3 0V 4 11 TRANSISTOR Function Range Base Current Vce hFE 1 to 1000 10μA 3 0V 25 ...

Page 29: ...5 ACCESSORIES 5 1 SUPPLIED WITH THE METER Operating Manual Set of test leads 9V battery NEDA1604 6F22 006P K type thermocouple 5 2 OPTIONAL ACCESSORY Holster RS232C Cable Set of 3 5 1 44MB disk 26 ...

Page 30: ...need replacement and blow almost always as a result of the operator s error Open the case as mentioned above and take the PCB assembly out from the case Replace the blown fuse with ratings specified WARNING Before attempting to open the case be sure that test leads have been disconnected from measurement circuit to avoid electric shock hazard For protection against fire replace fuses only with spe...

Page 31: ... F C 1 8 32 HYS004695 A0 ...

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