CEN-TECH 98674 Operation Manual Download

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ITEM 98674

DIGITAL MULTIMETER

OPERATION MANUAL

DIGITAL MULTIMETER

CONTENTS

CONTENTS

SAFETY INFORMATION

…1

1.1

PRELIMINARY

…1

1.2

DOS AND DON’TS

…2

1.3

SYMBOLS

…3

1.4

MAINTENANCE

…4

DESCRIPTION

…6

2.1

NAMES OF PARTS

…7

2.2

SWITCH, BUTTONS AND INPUT JACKS

…8

2.3

LIQUID-CRYSTAL DISPLAY (LCD)

…10

SPECIFICATIONS

…12

3.1

GENERAL SPECIFICATIONS

…12

3.2

TECHNICAL SPECIFICATIONS

…13

OPERATION INSTRUCTION

…23

4.1

MISCONNECTION ALARM

…23

4.2

HOLDING READINGS

…24

4.3

SWITCHING FUNCTIONS

…24

4.4

SWITCHING RANGES

…24

4.5

SWITCHING BETWEEN FREQUENCY/DUTY

…25

4.6

SWITCHING TO RELATIVE MEASUREMENT

…25

4.7

BACK LIGHT

…26

4.8

AUTO POWER OFF

…27

4.9

PREPARING FOR MEASUREMENT

…28

Summary of Contents for 98674

Page 1: ...H BUTTONS AND INPUT JACKS 8 2 3 LIQUID CRYSTAL DISPLAY LCD 10 3 SPECIFICATIONS 12 3 1 GENERAL SPECIFICATIONS 12 3 2 TECHNICAL SPECIFICATIONS 13 4 OPERATION INSTRUCTION 23 4 1 MISCONNECTION ALARM 23 4 2 HOLDING READINGS 24 4 3 SWITCHING FUNCTIONS 24 4 4 SWITCHING RANGES 24 4 5 SWITCHING BETWEEN FREQUENCY DUTY 25 4 6 SWITCHING TO RELATIVE MEASUREMENT 25 4 7 BACK LIGHT 26 4 8 AUTO POWER OFF 27 4 9 PR...

Page 2: ...proper use of this device can result in electric shock or destruction of the meter Take all normal safety precautions and follow the safeguards suggested in this manual To exploit full functionality of the meter and ensure safe operation please read carefully and follow the directions in this manual This meter complies with the general technical requirements for the GB T 19978 92 multimeter as wel...

Page 3: ...and earth ground exceeds 1000V 1 2 6 Select the highest range if the value scale to be measured in the manual range is unknown 2 DIGITAL MULTIMETER SAFETY INFORMATION NTS 1 2 7 Do not connect the meter to any voltage source while the rotary selector is in the current resistance capacitance diode continuity range 1 2 8 Disconnect the test leads from the circuit under test before turning the rotary ...

Page 4: ...rformed by a technician who fully understands the meter and the danger involved 1 4 2 Disconnect the test leads from all sources of electric current before opening the battery cover of the mete 1 4 3 To avoid any electric shock caused by error readings replace the batteries immediately when the sign appears on the display 1 4 4 To avoid fire hazards the replacement fuse must meet the specified vol...

Page 5: ... home and for checking the acoustics of studios auditoriums and hi fi installations The luminance function is applicable to measuring field luminance with full cosine correction for angular incidence of light The humidity and temperature functions are suitable for 6 DIGITAL MULTIMETER SAFETY INFORMATION NTS measuring ambient humidity and temperature as well as temperature of objects The digital mu...

Page 6: ...tching between auto and manual ranges Hz DUTY Button for switching between Hz and duty measurement REL Button for switching to relative measurement Button for switching between and Rotary Selector for selecting functions and ranges OFF Position for turning off the power 10A Input Jack for measuring current 0 10A mA µA TEMP Input Jack for measuring current 0 400mA and temperature V Ω Hz Input Jack ...

Page 7: ...ON NTS AC Alternating Current DC Direct Current AC or DC alternating current or direct current Diode Continuity buzzer H Reading being held REL Relative measurement AUTO Auto range Battery low Celsius units Temperature Fahrenheir units Temperature RH Relative Humidity units F Farad Capacitance Ω Ohms Resistance V Volts Voltage A Amperes Current Hz Hertz Frequency Duty Cycle dB Decibel Lux Illumina...

Page 8: ...er off time 30 min 3 1 13 Specification of resettable fuse F1 500mA 250V 3 1 14 Fuse protection F2 10A 250V quick acting 3 1 15 Operating power 1 5V 3 AAA batteries 3 1 16 Battery low indication on LCD 3 1 17 Temperature factor 0 1 Accuracy 12 DIGITAL MULTIMETER SPECIFICATION NTS 3 1 18 Operating temperature 0 to 40 32 F to 104 F 3 1 19 Storage temperature 10 to 50 10 F to 122 F 3 1 20 Dimension 1...

Page 9: ...r before the test leads contact the circuit This is normal because the meter is highly sensitive When the test leads contact the circuit the true reading will be shown 14 DIGITAL MULTIMETER SPECIFICATION NTS 3 2 3 DC Current Range Resolution Accuracy 400µA 0 1µA 4000µA 1µA 40mA 10µA 1 2 of reading 3 digits 400mA 100µA 4A 1mA 10A 10mA 2 0 of reading 10 digits Overload protection µA mA ranges resett...

Page 10: ...400µA ranges 40mV 4000µA ranges 400mV 40mA ranges 40mV 400mA ranges 400mV 4A range 40mV 10A range 100mV Frequency range 40 to 400Hz Response average calibrated in rms of sine wave 16 DIGITAL MULTIMETER SPECIFICATION NTS 3 2 5 Resistance Range Resolution Accuracy 400Ω 0 1Ω 4kΩ 1Ω 40kΩ 10Ω 400k 100Ω 4M 1kΩ 1 2 of reading 2 digits 40M 10kΩ 2 0 of reading 5 digits Open circuit voltage 0 25V Overload p...

Page 11: ...nput current range 1 4 range rms AC higher input voltage at higher frequency 18 DIGITAL MULTIMETER SPECIFICATION NTS Max input current mA jack µA ranges 4mA mA jack mA ranges 400mA 10A jack 10A Overload Protection µA mA ranges resettable fuses F1 500mA 250V 10A range F2 10A 250V fuse quick acting NOTE When measuring frequency the range by Hz range is larger than that by the Hz of voltage range or ...

Page 12: ...display Range Resolution Accuracy 20 95 0 1 5 0 RH Operating temperature 0 to 40 Sampling Period 20s 20 DIGITAL MULTIMETER SPECIFICATION NTS 3 2 10 Temperature 3 2 10 1 Temperature on sensor thermoresistor NTC and temperature display Range Resolution Accuracy 0 1 0 to 40 2 0 1 32 to 104 4 Sampling Period 20s 3 2 10 2 Temperature on sensor thermocouple and main display Range Resolution Accuracy 20 ...

Page 13: ...larms against misconnection of test leads 4 1 1 At V Ω Hz Duty ranges 1 The red lights at the IN and COM jacks 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 jacks to warn the user At the same time the lights at the IN and COM jacks will flash to remind the user to plug in the test leads there 4 1 2 At µA mA TEMP ranges...

Page 14: ...vel at each press and return 24 DIGITAL MULTIMETER OPERATING INSTRUCTION to the lowest level when the highest level is reached 3 Press the RANGE button for two or more seconds to return to the auto range 4 5 SWITCHING BETWEEN FREQUENCY DUTY 1 Press the Hz DUTY button at the frequency range to switch between frequency and duty measurement 2 When the meter is at the voltage and current ranges press ...

Page 15: ...utton for two or more seconds to switch on the back light if the light in the environment is too dim for taking reading 2 Press the HOLD B L button for two or more seconds 26 DIGITAL MULTIMETER OPERATING INSTRUCTION again to switch off the back light 3 The back light will go off automatically after 10 seconds NOTE 1 LED which requires a larger working current is the main source of back light Altho...

Page 16: ...connection Take away the charged test lead first when disconnecting 28 DIGITAL MULTIMETER OPERATING INSTRUCTION 4 10 MEASURING DC VOLTAGE WARNING Beware of electrocution Pay special attention to avoid electric shock when measuring high voltage Do not input any voltage over 1000V DC which may destroy the internal circuit although a higher voltage can be shown 4 10 1 Plug the black test lead into th...

Page 17: ...the test leads to the voltage source or load terminals for measurement 4 11 5 Take the reading on the main indicator of the LCD 30 DIGITAL MULTIMETER OPERATING INSTRUCTION NOTE 1 At small voltage range unsteady readings may appear before the test leads contact the circuit This is normal because the meter is highly sensitive When the test leads contact the circuit the true reading will be shown 2 A...

Page 18: ...utton to switch to DC measurement Then press the RANGE button to choose the auto range or manual range mode 32 DIGITAL MULTIMETER OPERATING INSTRUCTION 4 14 4 Connect the test leads to the circuit for measurement 4 14 5 Take the reading on the main indicator of the LCD The polarity symbol denotes the polarity of the end connected by the red test lead NOTE 1 At the manual range mode when only OL or...

Page 19: ...OPERATING INSTRUCTION 4 16 MEASURING RESISTANCE WARNING Beware of Electrocution When measuring in circuit resistance make sure that the power of the circuit under test has been turned off and that all capacitors have been fully discharged 4 16 1 Plug the black test lead into the COM jack and the red test lead into the Ω jack 4 16 2 Set the rotary selector to the Ω range position 4 16 3 Press the S...

Page 20: ...est lead into the jack 4 18 2 Set the rotary selector to the Ω range position 36 DIGITAL MULTIMETER OPERATING INSTRUCTION 4 18 3 Press the SELECT button to switch to test 4 18 4 Connect the red test lead to the anode and the black test lead to the cathode of the diode for testing 4 18 5 Take the reading on the main indicator of the LCD NOTE 1 The meter will show the approximate forward voltage dro...

Page 21: ...GITAL MULTIMETER OPERATING INSTRUCTION 4 21 MEASURING TEMPERATURE WITH THERMO RESISTOR 4 21 1 This function is used for measuring the ambient temperature around the meter 4 21 2 Turn the rotary selector away from the OFF position 4 21 3 The current ambient temperature will be shown on the temperature indicator of the LCD 4 21 4 Press the button to switch between and measurement NOTE 1 The temperat...

Page 22: ... environment Therefore the meter should be exposed to the environment for a longer time for accurate reading 40 DIGITAL MULTIMETER OPERATING INSTRUCTION 4 23 MEASURING SOUND LEVEL dB WARNING To avoid damage to the meter do not connect the input plug to any electric signal 4 23 1 Turn the rotary selector to the dB range position 4 23 2 Point the sensor located in the front part of the meter at the ...

Page 23: ...ressmaking work 750 2000 Office conference room reception room 200 750 42 DIGITAL MULTIMETER OPERATING INSTRUCTION clerical work 700 1 500 typing 1000 2 000 Factory packing passage 150 300 assembly line 300 750 inspection work 750 1 500 electronic parts assembly line 1 500 3 000 Hotel public places washroom 100 200 reception front desk 200 1 000 Shop staircase corridor 150 200 display window packi...

Page 24: ...1 REPLACING THE BATTERIES WARNING To avoid electric shock make sure that the test leads have been clearly move away from the circuit under measurement before opening the battery cover of the meter 5 1 1 If the sign appears it means that the batteries should be replaced 5 1 2 Loosen the fixing screw of the battery cover and remove it 5 1 3 Replace the exhausted batteries with new ones 5 1 4 Put the...

Page 25: ...ore opening the battery cover of the meter For protection against fire hazard replace fuses with specified ratings only F 10A 250V quick acting A A A A A A 46 DIGITAL MULTIMETER MAINTENANCE 5 3 REPLACING TEST LEADS WARNING The replacement must be test leads in good working condition with the same or equivalent rating 1000V 10A A test lead must be replaced if the insulation layer has been damaged e...

Page 26: ...DIGITAL MULTIMETER ACCESSORIES 6 ACCESSORIES 1 Test leads electric rating 1000V 10A 1 pair set 2 Thermocouple K type TP01 1 set 3 Operation Manual 1 copy 48 ...

Page 27: ...HYS005958 ...

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