Mastech MS8264
Contents
1. F lt 70 RH battery removed Temperature Coefficient 0 1 specified accuracy C lt 18 C or gt 28 C MAX Voltage between terminals and earth ground 750V AC rms or 1000V DC Fuse Protection mA Resettable fuse F200mA 250V Sample Rate 3 times sec for digital data Display 3 1 2 digits LCD display Automatic indication of functions and symbols Over Range indication LCD will display 1 Low battery indication The EI is displayed when the battery is under the proper operation range Polarity indication displayed automatically Power source 9V Battery type NEDA 1604 6F22 or 006P Dimensions 195 L 92 W 55 H mm Weight 380g Approx battery included 4 2 Measurement specifications Accuracy is specified for one year after calibration at operating temperatures of 18 C to 28 C with relative humidity at 0 to 75 Accuracy specifications take the form of of Reading Number of Least Significant Digits 4 2 1 DC Voltage Rang Resolutio Accuracy e n 200m 0 1mV V 0 5 of rdg 1 digit 2V 1mV www HisTest com 20v 10mv 200V 100mv 1000 1V 0 8 of rdg 2 digits V Input impedance 10M Max input voltage 250Vdc or ac rms for 200mV range and 1000Vdc or 750V ac rms for other ranges 4 2 2 AC Voltage Range Resoluti Accuracy on 2V 1mV 20V 10mV 0 8 of2. These 10 digits have to be subtracted from measuring results For example when measuring 100 M resistance the reading will be 101 0 and the correct measuring result should be 101 0 1 0 100 0 M When the input is not connected i e at open circuit the figure 1 will be displayed for the overrange condition 3 2 3 Diode Test A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before testing diodes www HisTest com Use the diode test to check diodes and other semi conductor devices The diode test sends a current through the semiconductor junction and then measures the voltage drop across the junction a good silicon junction drops between 0 5V and 0 8V To test a diode out of a circuit 1 Set the rotary switch to gt range 2 Connect the black and red test leads to the COM and terminals respectively 3 For forward bias readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode 4 The meter will show the approx forward voltage of the diode If the test lead connection is reversed only figure 1 displayed In a circuit a good diode should still produce a forward bias reading of 0 5V to 0 8V however the reverse bias reading can vary depending on the resistance of other pathways between the probe tips 3 2 4 Continuity Check A To avoid elec
3. 1 2 Battery Saver Turn on the meter And then The Meter will be turned off automatic after approx 30 minutes 3 2 Measurement Functions 3 2 1 AC and DC Voltage measurement A To avoid electrical shock and or damage to the instrument do not attempt to take any voltage measurement that might exceeds 1000Vdc or 750Vac rms To avoid electrical shock and or damage to the instrument do not apply more than 1000Vdc or 750Vac rms between the common terminal and the earth ground Voltage is the difference in electrical potential between two points The polarity of ac alternating current voltage varies over time the polarity of dc direct current voltage is constant The Meter s DC voltage ranges are 200 0mV 2 000V 20 00V 200 0V and 1000V AC voltage ranges are 2 000V 20 00V 200 0V and 7500V To measure ac or dc voltage 1 Set rotary switch to the proper range 2 Connect the black and red test leads to the COM and V terminals respectively www HisTest com 3 Connect the test leads to the circuit being measured 4 Read the displayed value The polarity of red test lead connection will be indicated when making a DCV measurement NOTE Unstable display may occur especially at DC200mV and AC2V ranges even though you do not put test leads into input terminals in this case if an erroneous reading is suspected short the V terminal and the COM terminal and make sure the zero display 3 2 2 Resistance measuremen
4. to measure 10 minutes OFF Above 10A unspecified Frequency Range 40Hz 400Hz Response Average calibrated in rms of sine wave 5 MAINTENANCE Do not attempt to repair or service your Meter unless you are qualified to do so and have the relevant calibration performance test and service information 5 1 General Maintenance A To avoid electrical shock or damage to the meter do not get water inside the case Remove the test leads and any input signals before opening the case 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 5 2 Battery replacement A To avoid false readings which could lead to possible electric shock or personal injury www HisTest com replace the battery as soon as the battery indicator E appears Before replacing the battery disconnect test leads and or any connectors from any circuit under test turn the meter off and remove test leads from the input terminals To replace the battery see Figure 2 Turn the meter off Disconnect test leads and or any con
5. when working with voltages above 60Vdc or 30Vac rms Such voltages pose a shock hazard When using the probes keep your fingers behind the finger guards When making connections connect the common test lead before connecting the live test lead when disconnecting disconnect the live test lead before disconnecting the common test lead Before changing functions disconnect the test leads from the circuit under test For all dc functions including manual or auto ranging to avoid the risk of shock due to possible improper reading verify the presence of any ac voltages by first using the ac function Then select a dc voltage range equal to or greater than the ac range Disconnect circuits power and discharge all high voltage capacitors before testing resistance continuity diodes or capacitance Never perform resistance or continuity measurements on live circuits Before measuring current check the meter s fuse and turn off power to the circuit before connecting the meter to the circuit In TV repair work or when carrying out measurements on power switching circuits remember that high amplitude voltage pulses at the test points can damage the multimeter Use of a TV filter will attenuate any such pulses Use the 9V NEDA battery properly installed in the Meter s battery case to power the Meter Replace the battery as soon as the battery indicator EX appears With a low battery the Meter might produce false readi
6. Hold mode LIGH Any switch Press LIGHT to turn T position the backlight on After about 5 seconds the backlight is auto off 2 4 Terminals See Table 4 indicated for information about the terminals Table 4 Terminals Termi Description nal Return terminal for all measurements Receiving the black test lead or the COM com plug of the special multi function socket Input for voltage resistance frequency gt V p g q y 7 diode and continuity measurements Zz Receiving the red test lead Input for capacitance Temperature CmA 4k hE hFE and 0 001mA to 200mA current E measurements Receiving the red test lead or the plug of the special www HisTest com multi function socket Input for 200mA to 10A current 10A measurements Receiving the red test lead 2 5 Accessories Delivered with the multimeter User s manual One piece Test leads One piece Carry case One piece K type bead One piece Thermocouple Special Multi function One piece socket 3 FUNCTION DESCRIPTION 3 1 General Functions 3 1 1 DATA HOLD mode Data Hold mode makes the meter stop updating the display Data Hold function can be cancelled by changing the measurement mode or push HOLD key again To enter and exit the Data Hold mode 1 Press HOLD key Fixes the display on the current value Hi is displayed 2 A second short press returns the meter to normal mode 3
7. Mastech MS8264 User s Manual GENERAL INSTRUCTIONS This instrument complies with IEC 1010 1 61010 1 IEC 2001 CAT Il 1000V and CAT Ill 600V overvoltage standards See Specifications To get the best service from this instrument read carefully this user s manual and respect the detailed safety precautions International symbols used on the Meter and in this manual are explained in chapter 1 1 3 Precautions safety measures 1 1 1 Preliminary Measurement category III is for measurements performed in the building installation NOTE Examples are measurements on distribution boards circuit breakers wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and equipment for industrial use and some other equipment for example stationary motors with permanent connection to the fixed installation Measurement category II is for measurements performed on circuits directly connected to the low voltage installation NOTE Examples are measurements on household appliances portable tools and similar equipment Measurement category is for measurements performed on circuits not directly connected to MAINS NOTE Examples are measurements on circuits not derived from MAINS and specially protected internal MAINS derived circuits In the latter case transient stresses are variable for that reason requires that the transient withstand capability of the equipment is made known to the user
8. When using this Multimeter the user must observe all normal safety rules concerning protection against the dangers of electric current protection of the Multimeter against misuse For your own safety only use the test probes supplied with the instrument Before use check that they are in good condition 1 1 2 During use If the meter is used near noise generating equipment be aware that display may become unstable or indicate large errors Do not use the meter or test leads if they look damaged Use the meter only as specified in this manual otherwise the protection provided by the meter may be impaired www HisTest com Use extreme caution when working around bare conductors or bus bars Do not operate the meter around explosive gas vapor or dust Verify a Meter s operation by measuring a known voltage Do not use the Meter if it operates abnormally Protection may be impaired When in doubt have the Meter serviced Uses the proper terminals function and range for your measurements When the range of the value to be measured is unknown check that the range initially set on the multimeter is the highest possible or wherever possible choose the autoranging mode To avoid damages to the instrument do not exceed the maximum limits of the input values shown in the technical specification tables When the multimeter is linked to measurement circuits do not touch unused terminals Caution
9. ct the test leads to the circuit being measured 4 Read the displayed value 3 2 8 Temperature measurement www HisTest com A To avoid electrical shock and or damage to the instrument do not apply more than 250Vdc or 250Vac rms between the C terminal and the COM terminal To avoid electrical shock do not use this instrument when voltages at the measurement surface exceed 60v dc or 24v rms Ac To avoid damage or burns Do not make temperature measurements in microwave ovens To measure temperature 1 Set the rotary switch to C range and the LCD will show the current environment temperature 2 Connect the com plug and plug of the special multi function socket to the COM and hFE terminals 3 Insert K type thermocouples into the special multi function socket Takings care to observe the correct polarity 4 Touch the object with the thermocouple probe for measurement 5 Read the stable reading from LCD 3 2 9 Current measurement A To avoid damage to the Meter or injury if the fuse blows never attempt an in circuit current measurement where the open circuit potential to earth is greater than 250V To avoid damage to the meter check the meter s fuse before proceeding Use the proper terminals function and range for your measurement Never place the test leads in parallel with a circuit or component when the leads are plugged into the current terminals Current is the flow of
10. d up remember that some internal capacitors can retain a dangerous potential even after the instrument is switched off If any faults or abnormalities are observed take the instrument out of service and ensure that it cannot be used until it has been checked out If the meter is not going to be used for a long time take out the battery and do not store the meter in high temperature or high humidity environment Protection mechanisms Fused by the resettable fuse F200mA 250V during capacitance temperature mA and hFE measurements A PTC resistor protects against permanent overvoltages of up to 380V during resistance Frequency continuity and diode test measurements 2 DESCRIPTION 2 1 Instrument Familiarization S O co AN 4 4 hFE E gt t o CF H pe kHz ital mh aan ed pAmA t ee aa 7 gt a i Eod amwe A A cell 1 LCD display 2 Keypad 3 Rotary switch 4 Terminals 2 2 LCD Display www HisTest com See Table 1 indicated for information about the LCD display E ton hFE C F pc qa Gi lis kHz OLDE Lp Ee Ga lt gt lt D mVVA OOO ES 2 20 200 a Figure 1 Display Table 1 Display Symbols Symbol Meaning The battery is low A Warning To avoid false readings which could lead to possible electric shock or personal injur
11. electrons through a conductor The Meter s DC current ranges are 20 00mA 200 0mA and 10 00A AC current ranges are 2 000mA 200 0mA and 10 00A To measure current 1 Turn off the power of the measured circuit Discharge all the high voltage capacitors 2 Set the rotary switch to the proper range 3 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 of 10A move the red test lead to the 10A terminal 4 Break the circuit path to be tested www HisTest com Connect the black test lead to the more negative side of the break connect the red test lead to the more positive side of the break Reversing the leads will give a negative reading but will not damage the Meter 5 Turn on the power of the measured circuit and then read the display Be sure to note the measurement units at the right side of the display mA or A When only the figure 1 displayed it indicates overrange situation and the higher range has to be selected 6 Turn off the power of the measured circuit and discharge all the high voltage capacitors Remove the test leads and recover the measured circuit 4 TECHNICAL SPECIFICATIONS 4 1 GENERAL SPECIFICATIONS Environment conditions 1000V CAT II and 600V CAT III Pollution degree 2 Altitude lt 2000m Operating temperature 0 40 C 32 F 122 F lt 80 RH lt 10 C noncondensing Storage temperature 10 60 C 14 F 140
12. nectors from the terminals Use a screwdriver to unscrew the two screws secured on the battery cover Take out the battery cover from the meter Remove the used batteries Replace with the new 9V batteries 6F22 Rejoin the battery cover and secure by the two screws Battery cover Figure 2 Battery and Fuse Replacement A 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 www HisTest com
13. ngs that can lead to electric shock and personal injury Do not measure voltages above 600V in Category Ill or 1000V in Category II installations Do not operate the Meter with the case or part of the case removed 1 1 3 Symbols Symbols used in this manual and on the instrument Caution refer to the instruction manual gt Incorrect use may result in damage to the device or its components AC Alternating Current DC Direct Current Earth ground l I I Double insulated j E Fuse CE Conforms to European Union directives www HisTest com 1 1 4 Instructions Remove test leads from the Meter before opening the Meter case or battery cover When servicing the Meter use only specified replacement parts Before opening up the instrument always disconnect from all sources of electric current and make sure you are not charged with static electricity which may destroy internal components Any adjustment maintenance or repair work carried out on the meter while it is live should be carried out only by appropriately qualified personnel after having taken into account the instructions in this present manual A qualified person is someone who is familiar with the installation construction and operation of the equipment and the hazards involved He is trained and authorized to energize and de energize circuits and equipment in accordance with established practices When the instrument is opene
14. ox 10pA read Base Current of Vce approx 2 8V transistor under test all type 4 2 8 Temperature Range Resoluti Accuracy on 20 C 0 C 5 0 of rdg 4 digits 1 C 400 C ce 1 0 of rdgt 3 digits 401 C 1000 c 2 0 of rdg Overload protection Resettable fuse F200mA 250V Temperature specifications do not include thermocouple errors 4 2 9 Capacitance Range Resolutio Accuracy n 2nF 1pF 20nF 10pF 200nF 0 1nF 4 0 of rdg 3 digits 2 F 1nF 20 F 10nF Overload protection Resettable fuse F200mA 250V www HisTest com 4 2 10 DC Current Resolutio Range Accuracy n 20mA 10 A 1 5 of rdg 1 digit 200mA 0 1mA 10A 10mA 2 0 of rdg 5 digits Overload protection Resettable fuse F200mA 250V 10A range unfused Max input current 200mA dc or 200mA ac rms for mA range 10A dc or 10A ac rms for 10A ranges For measurements gt 5A 4 minutes maximum ON to measure 10 minutes OFF Above 10A unspecified 4 2 11 AC Current Resolutio Range Accuracy n 2mA 1 A 1 0 of rdg 3 digits 200mA 0 1mA 1 8 of rdg 3 digits 10A 10mA 3 0 of rdg 7 digits Overload protection Resettable fuse F200mA 250V 10A range unfused Max input current 200mA dc or 200mA ac rms for mA range 10A dc or 10A ac rms for 10A ranges For measurements gt 5A 4 minutes maximum ON
15. rdg 3 digits 200V 100mV 750V 1V 1 2 of rdg 3 digits Input impedance 10M Max input voltage 250Vdc or ac rms for 200mV range and 1000Vdc or 750V ac rms for other ranges Frequency Range 40Hz 200Hz for 750V range 40Hz 400Hz for other ranges Response Average calibrated in rms of sine wave 4 2 3 Frequency Range Resoluti Accuracy on 20kHz 10 Hz 1 5 of rdg 5 digits Overload protection 380V dc or 380V ac rms Input Voltage range 200mV 10V ac rms 4 2 4 Resistance Rang Resolut Accuracy e ion 200 0 1 0 8 of rdg 3 digits 2k 1 20k 10 0 8 of rdg 1 digit 200k 100 2M 1k 20M _ 10k 1 0 of rdg 2 digits 200M 0 1M 5 0 of rdg 10digits 10 digits Overload protection 380V dc or 380Vac rms Open Circuit Voltage Less than 700mV 4 2 5 Diode Rang Resoluti Function e on gt 1mV Display read approx www HisTest com forward voltage of diode Forward DC Current approx 1mMA Reversed DC Voltage approx 2 8V Overload protection 380Vdc or 380Vac rms 4 2 6 Audible continuity e Rang Continuity beeper oat lt 30 Open circuit voltage Less than 700mvV Overload protection 380Vdc or 380Vac rms 4 2 7 Transistor Ran Description ge Test Condition Display hFE 0 1000 approx HFE value appr
16. re the capacitance by using the special Multi Function Socket 3 Connect the test leads to the capacitor being measured and read the displayed value Some tips for measuring capacitance The meter may take a few seconds to stabilize reading This is normal for high capacitance measuring To improve the accuracy of measurements less than 20nF subtract the residual capacitance of the Meter and leads 3 2 6 Transistor measurement A To avoid electrical shock and or damage to the instrument do not apply more than 250Vdc or 250Vac rms between the hFE terminal and the COM terminal 1 Set the rotary switch to hFE range 2 Connect the com plug and plug of the special multi function socket to the COM and hFE terminals 3 Determine whether the transistor to be tested is NPN or PNP type and locate the Emitter Base and Collector leads 4 Insert leads of the transistor into proper holes of the special multi function socket 5 The meter will show the approx hFE value at test condition of base current 10A and Vce 2 8V 3 2 7 Frequency measurement A Do not measure Frequency on high voltage gt 380V to avoid electrical shock hazard and or damage to the instrument Frequency is the number of cycles a voltage or current signal completes each second To measure frequency 1 Set the rotary switch to 20kHz range 2 Connect the black and red test leads to the COM and Hz terminals respectively 3 Conne
17. t A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before measuring resistance Resistance is an opposition to current flow The unit of resistance is the ohm The Meter s resistance ranges are 200 0 2 000k 20 00k 200 0k 2 000M 20 00M and 200 0M To measure resistance 1 Set the rotary switch to proper range 2 Connect the black and red test leads to the COM and terminals respectively 3 Connect the test leads to the circuit being measured and read the displayed value Some tips for measuring resistance The measured value of a resistor in a circuit is often different from the resistor s rated value This is because the Meter s test current flows through all possible paths between the probe tips In order to ensure the best accuracy in measurement of low resistance short the test leads before measurement and memory the test probe resistance in mind This necessary to subtract for the resistance of the test leads The resistance function can produce enough voltage to forward bias silicon diode or transistor junctions causing them to conduct To avoid this do not use the 40M range for in circuit resistance measurements On 20M and 200M ranges the meter may take a few seconds to stabilize reading This is normal for high resistance measuring On 200M range the display is approx 10 digits when test leads are shorted
18. trical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before testing for Continuity Continuity is a complete path for current flow The beeper sounds if a circuit is complete These brief contacts cause the Meter to emit a short beep To test for continuity 1 Set the rotary switch to a range 2 Press the yellow key twice to activate Continuity Check 3 Connect the black and red test leads to the COM and terminals respectively 4 Connect the test leads to the resistance in the circuit being measured 5 When the test lead to the circuit is below approx 30 a continuous beeping will indicate it Note Continuity test is available to check open short of the circuit 3 2 5 Capacitance measurement A To avoid electrical shock and or damage to the instrument disconnect circuit power and discharge all high voltage capacitors before measuring capacitance Use the dc voltage function to confirm that the capacitor is discharged Capacitance is the ability of a component to store an electrical charge The unit of capacitance is the farad F Most capacitors are in the nanofarad to microfarad range The Meter s capacitance ranges are 20 00nF 200 0nF 2 000 F and 20 00 F www HisTest com To measure capacitance 1 Set the rotary switch to proper range 2 Connect the black and red test leads to the COM and 4k terminals respectively or you can measu
19. y replace the battery as soon as the battery indicator appears Indicates negative readings Indicator for ac voltage or current AC voltage and current are displayed as the average of the absolute value of the input calibrated to indicate the equivalent rms value of a sine wave De Indicator for dc voltage or current gt The Meter is in the Diode Test mode Table 1 Display Symbols continued The Meter is in the Continuity Check ot mode H The Meter is in the Data Hold mode C Celsius scale The unit of Cor F temperature F Fahrenheit scale V Volts The unit of voltage V mV m Millivolt 1x10 3 or 0 001 volts V A Amperes amps The unit of m current A mA A Milliamp 1x10 3 or 0 001 A A amperes Microamp 1x10 6 or 0 000001 amperes www HisTest com Ohm The unit of resistance k M k Kilohm 1x103 or 1000 ohms M Megohm 1x106 or 1 000 000 ohms K Kilohertz 1x103 or 1000 hertz kHz H z F Farad The unit of capacitance F Microfarad 1x10 6 or 0 000001 F nF farads n Nanofarad 1x10 9 or F 0 000000001 farads 2 3 Keypad See Table 2 indicated for information about the keypad operations Table 2 Keypad Key Function Operation performed ON O Any switch turn the meter on or FF position off HOLD Any switch Press HOLD to enter position and exit the Data
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