Mastech MS8264 Operator'S Instruction Manual Download Page 13

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forward voltage of diode

Forward DC Current: approx. 1mA

Reversed DC Voltage: approx. 2.8V

Overload protection: 380Vdc or 380Vac rms.

4.2.6 Audible continuity

Rang

Continuity beeper

≤30(

Open circuit voltage: Less than 700mV.

Overload protection: 380Vdc or 380Vac rms.

4.2.7 Transistor

Ran

Description

Test Condition

hFE

Display

read

approx. HFE value

(0-1000)

transistor

under

test (all type).

Base

Current

approx.

10μA,

Vce approx. 2.8V.

4.2.8 Temperature

Range

Resoluti

Accuracy

-20

℃

±(5.0%

rdg+4

digits)

℃

~400

℃

±(1.0%

rdg+3

digits)

401

℃

~1000

℃

±2.0% of rdg

Overload protection: Resettable fuse (F200mA/250V).

* Temperature specifications do not include thermocouple errors.

4.2.9 Capacitance

Range

Resolutio

Accuracy

2nF

1pF

±(4.0% of rdg+3 digits)

20nF

10pF

200nF

0.1nF

2(F

1nF

20(F

10nF

Overload protection: Resettable fuse (F200mA/250V).

Summary of Contents for MS8264

Page 1: ... directly connected to the low voltage installation NOTE Examples are measurements on household appliances portable tools and similar equipment Measurement category I 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...

Page 2: ... 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 ...

Page 3: ...nd authorized to energize and de energize circuits and equipment in accordance with established practices When the instrument is opened 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 t...

Page 4: ... 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 Indicator for dc voltage or current The Meter is in the Diode Test mode Table 1 Display Symbols continued The Meter is in the Continuity Check mode The Meter is in the Data Hold mode or Celsius scale The unit of temperature Fahrenheit scale V mV V m V Volts Th...

Page 5: ...ition Press HOLD to enter and exit the Data Hold mode LIGH T Any switch position Press LIGHT to turn 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 nal Description COM Return terminal for all measurements Receiving the black test lead or the com plug of the special multi function socke...

Page 6: ...eter 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 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 ...

Page 7: ...istor 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...

Page 8: ...nnect 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 range 2 Press the yellow key twice to activate Continuity Check 3 Connect the black and red test leads to the ...

Page 9: ...OM 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...

Page 10: ... 9 Current measurement 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 th...

Page 11: ...RH 10 noncondensing Storage temperature 10 60 14 140 70 RH battery removed Temperature Coefficient 0 1 specified accuracy 18 or 28 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 ...

Page 12: ...requency 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 on Accuracy 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 e Resolut ion Accuracy 200 0 1 0 8 of rdg 3 digits 2k 1 0 8 of rdg 1 digit 20k 10 200k 100 2M 1k 20M 10k 1...

Page 13: ...ion hFE Display read approx HFE value 0 1000 of transistor under test all type Base Current approx 10μA Vce approx 2 8V 4 2 8 Temperature Range Resoluti on Accuracy 20 0 1 5 0 of rdg 4 digits 1 400 1 0 of rdg 3 digits 401 1000 2 0 of rdg Overload protection Resettable fuse F200mA 250V Temperature specifications do not include thermocouple errors 4 2 9 Capacitance Range Resolutio n Accuracy 2nF 1pF...

Page 14: ... 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 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 c...

Page 15: ...rew 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 9V Battery 9V Battery 9V Battery 9V Battery Battery cover Battery cover Battery cover Battery cover Figure 2 Battery and Fuse Replacement CAUTION Using this appliance in an environment with a...

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