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5. Break the circuit path to be tested.

Touch the black probe to the more negative side of the

break; touch the red probe to the more positive side of

the break. (Reversing the leads will give a negative

reading, but will not damage the Meter.)

6. Turn on power to the circuit; then read the display. Be

sure to note the measurement units at the right side of

the display (

A, mA or A). When only the figure "OL"

displayed, it indicates overrange situation and the

higher range has to be selected.

7. Turn off power to the circuit and discharge all high

voltage capacitors. Remove the Meter and restore the

circuit to normal operation.

4 TECHNICAL

TECHNICAL

TECHNICAL SPECIFICATIONS

SPECIFICATIONS

4.1

4.1 GENERAL

GENERAL

GENERAL SPECIFICATIONS

SPECIFICATIONS

ℕ

Environment conditions:

1000V CAT. II and 600V CAT. III

Pollution degree: 2

Altitude < 2000m

Operating temperature:

0~40

℃

, 32

℉

~122

℉

(<80%RH, <10

℃

non- condensing)

Storage temperature:

-10~60

℃

, 14

℉

~140

℉

(<70% RH, battery removed)

ℕ

Temperature Coefficient:

0.1

(specified accuracy) /

℃

(<18

℃

or >28

℃

)

ℕ

MAX. Voltage between terminals and earth ground:

750V AC rms or 1000V DC.

ℕ

Fuse Protection:

A and mA: Resettable fuse(400mA/250V);

10A: F 10A/250V

∅

6.3

32 mm.

ℕ

Sample Rate: 3 times/sec for digital data.

ℕ

Display:

3 3/4 digits LCD display. Automatic indication of functions

and symbols.

ℕ

Range selection: automatic and manual.

ℕ

Over Range indication: LCD will display "OL".

ℕ

Low battery indication:

The "

" is displayed when the battery is under the

proper operation range.

ℕ

Polarity indication: "

−

" displayed automatically.

ℕ

Power source: DC 4.5V

ℕ

Battery type: 1.5V AAA.

ℕ

Dimensions: 195

55 mm.

ℕ

Weight: 400g. Approx. (battery included).

4.2

4.2 Measurement

Measurement

Measurement specifications

specifications

Accuracy is specified for one year after calibration, at

operating temperatures of 18

℃

to 28

℃

, with relative humidity

at 0% to 75%.

Accuracy specifications take the form of: ± (% of R

Number of Least Significant Digits)

4.2.1

4.2.1 DC

DC Voltage

Voltage

Range

Resolution

Accuracy

400mV

0.1mV

（

0.7% of rdg +2 digits

）

1mV

40V

10mV

400V

100mV

1000V

（

0.8% of rdg +2 digits

）

Input impedance: 10M

Ω

Max. input voltage: 1000Vdc or 750V ac rms.

Содержание MS8268

Страница 1: ...Mastech MS8268 HANDHELD DIGITAL MULTIMETER OPERATOR S INSTRUCTION MANUAL http www HisTest com ...

Страница 2: ...aver 14 3 1 5 Relative measurement mode 14 3 2 Measurement Functions 15 3 2 1 AC and DC Voltage measurement 15 Ⅰ Table Table Table Table of of of of Contents Contents Contents Contents TITLE TITLE TITLE TITLE PAGE PAGE PAGE PAGE 3 2 2 Resistance measurement 16 3 2 3 Diode Test 17 3 2 4 Continuity Check 18 3 2 5 Transistor measurement 18 3 2 6 Capacitance measurement 19 3 2 7 Frequency and Duty Cyc...

Страница 3: ...otected 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 1 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 ...

Страница 4: ...ents 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 three 1 5V AAA batteries properly installed in the Meter s battery case to power the Meter 3 Replace the batteries as soon as the battery indicator appears With a low battery the Meter might produce false readings that can l...

Страница 5: ...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 1 2 1 2 1 2 1 2 Safety Safety Safety Safety mechanisms mechanisms mechanisms mechanisms Miscon...

Страница 6: ...lay Display Symbols Symbols Symbols Symbols continued continued continued continued Symbol Symbol Symbol Symbol Meaning Meaning Meaning Meaning REL REL REL REL Indicator for the Relative measurement Indicator for the Diode Test mode hFE hFE hFE hFE Indicator for the transistor test mode Indicator for the Continuity Check mode Indicator for the Data Hold mode V V V V mV mV mV mV V mV Volts The unit...

Страница 7: ...counter mode 9 Table Table Table Table 2 2 2 2 Keypad Keypad Keypad Keypad continued continued continued continued Key Key Key Key Function Function Function Function Operation Operation Operation Operation performed performed performed performed HOLD HOLD HOLD HOLD Any Any Any Any switch switch switch switch position position position position Press HOLD HOLD HOLD HOLD to enter and exit the Data ...

Страница 8: ... and and and ranges ranges ranges ranges 1 The red lights at the V and COM terminals will be off after the test leads are plugged in 2 The buzzer will sound upon misconnection of the test leads in the mA or 10A terminals to warn the user At the same time the lights at the V and COM terminals will flash to remind the user to plug in the test leads there At At At At μ μ μ μA A A A mA mA mA mA and an...

Страница 9: ...ging mode AUTO AUTO AUTO AUTO turns off Each presses of RANGE RANGE RANGE RANGE key increments the range When the highest range is reached the Meter wraps to the lowest range 13 NOTE If you manually change the measurement range after entering the Data Hold modes the Meter exits this mode 2 To exit the manual ranging mode press and hold down RANGE RANGE RANGE RANGE key for two seconds The Meter ret...

Страница 10: ...d value The polarity of red test lead connection will be indicated when making a DCV measurement NOTE NOTE NOTE NOTE ℕ Unstable display may occur especially at 400mV range 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 15 ℕ For better accuracy when measuring the dc...

Страница 11: ... 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 3 2 4 3 2 4 3 2 4 Continuity Continuity Continuity Continuity Check Check Check Check To To To To avoid avoid avoid avoid electrical electrical electrical electrical shock shock shock shock and or and or and or and or damage damage damage dama...

Страница 12: ...pacitance The measurement takes about 1 second per range The Meter s capacitance ranges are 4 000nF 40 00nF 400 0nF 4 000µF 40 00µF and 200 0µF 19 To measure capacitance 1 Set the rotary switch to range 2 Connect the black and red test leads to the COM COM COM COM and terminals respectively or you can measure the capacitance by using the special Multi Function Socket 3 Connect the test leads to th...

Страница 13: ...or injury injury injury injury if if if if the the the the fuse fuse fuse fuse blows blows blows blows never never never never attempt attempt attempt attempt an an an an in circuit in circuit in circuit in circuit current current current current measurement measurement measurement measurement where where where where the the the the open circuit open circuit open circuit open circuit potential pot...

Страница 14: ...re Coefficient 0 1 specified accuracy 18 or 28 ℕ MAX Voltage between terminals and earth ground 750V AC rms or 1000V DC ℕ Fuse Protection µA and mA Resettable fuse 400mA 250V 23 10A F 10A 250V 6 3 32 mm ℕ Sample Rate 3 times sec for digital data ℕ Display 3 3 4 digits LCD display Automatic indication of functions and symbols ℕ Range selection automatic and manual ℕ Over Range indication LCD will d...

Страница 15: ...x 0 5V Overload protection 250Vdc or 250Vac rms 25 4 2 4 2 4 2 4 2 5 5 5 5 Diode Diode Diode Diode Range Resolution Function 1mV Display read approx forward voltage of diode Forward DC Current approx 1mA Reversed DC Voltage approx 1 5V Overload protection 250Vdc or 150Vac rms 4 4 4 4 2 2 2 2 6 6 6 6 Transistor Transistor Transistor Transistor Range Description Test Condition hFE Display read appro...

Страница 16: ... current 400mA dc or 400mA ac rms for µA and mA ranges 27 4 2 4 2 4 2 4 2 9 9 9 9 DC DC DC DC CURRENT CURRENT CURRENT CURRENT Range Resolution Accuracy 400µA 0 1µA 1 2 of rdg 3 digits 4000µA 1µA 40mA 0 01mA 400mA 0 1mA 10A 10mA 2 0 of rdg 5 digits Overload protection F 10A 250V fuse for 10A range Resettable fuse F400mA 250V for µA and mA ranges Maximum input current 400mA dc or 400mA ac rms for µA...

Страница 17: ... only with with with with specified specified specified specified ratings ratings ratings ratings To replace the Meter s fuse see Figure 2 1 Set rotary switch to the OFF position 29 2 Disconnect test leads and or any connectors from the terminals 3 Use a screwdriver to unscrew the two screws secured on the battery cover 4 Take out the battery cover from the meter 5 Remove the fuse by gently prying...

Страница 18: ...use Replacemen Replacemen Replacemen Replacement t t t CAUTION CAUTION CAUTION CAUTION Using this appliance in an environment with a strong radiated radio frequency electromagnetic field9approximately 3V m may influence its measuring accuracy The measuring result can be strongly deviating from the actual value 31 ...

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