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Harbor Freight Tools
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98674
Product manual
27 pgs765.96 Kb0

Harbor Freight Tools 98674 Product manual

ITEM 98674
DIGITAL MULTIMETER
OPERATION MANUAL
CONTENTS
1. SAFETY INFORMATION …1
1.1 PRELIMINARY …1
1.2 DOS AND DON’TS …2
1.3 SYMBOLS …3
1.4 MAINTENANCE …4
2. DESCRIPTION …6
2.1 NAMES OF PARTS …7
2.2 SWITCH, BUTTONS AND INPUT JACKS …8
2.3 LIQUID-CRYSTAL DISPLAY (LCD)
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 PREPARING FOR MEASUREMENT …28
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4.10 MEASURING DC VOLTAGE …29
4.11 MEASURING AC VOLTAGE …30
4.12 MEASURING FREQUENCY …31
4.13 MEASURING DUTY …32
4.14 MEASURING DC CURRENT …32
4.15 MEASURING AC CURRENT …33
4.16 MEASURING RESISTANCE …35
4.17 MEASURING CAPACITANCE …36
4.18 TESTING DIODE …36
4.19 TESTING CONTINUITY …37
4.20 MEASURING RELATIVE HUMIDITY …38
4.21 MEASURING TEMPERATURE (WITH THERMO-RESISTOR)
4.22 MEASURING TEMPERATURE (WITH THERMOCOUPLE)
4.23 MEASURING SOUND LEVEL (dB) …41
4.24 MEASURING LUMINANCE …41
5. MAINTENANCE …45
5.1 REPLACING THE BATTERIES …45
5.2 REPLACING FUSE …45
5.3 REPLACING TEST LEADS …47
6. ACCESSORIES …48
…39
…40
1. SAFETY INFORMATION WARNING
BE EXTREMELY CAREFUL WHEN USING THIS METER. Improper 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 well as the safety requirements for GB4793.1-1995 (IEC-1010-1:1990) concerning electronic measuring instruments, with pollution degree 2 and overvoltage at CAT ΙΙ 1000V/ CAT ΙΙΙ 600V. Follow all safety and operation instructions to ensure safe use of the meter. With proper use and care, this digital multimeter will give you years of satisfactory service.
1.1 PRELIMINARY
1.1.1 When using the meter, the user must observe all
normal safety rules concerning:
1) general protection against electric shock
2) protection of the meter against misuse
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DIGITAL MULTIMETER
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SAFETY INFORMATION
1.1.2 When the meter is delivered, check whether it has been damaged in transit.
1.1.3 After being stored and delivered under harsh conditions, the meter should be checked and confirmed whether any damages have been incurred.
1.1.4 Test leads must be kept in good condition. Check whether the insulation on test leads has been damaged and any wire has been exposed.
1.1.5 Use the test leads supplied to ensure operation safety. If required, they must be replaced with test leads of the same model or class.
1.2 DOS AND DON’TS
1.2.1 Use the right input jack, function and range.
1.2.2 Do not take measurements that exceed the protection limit values indicated in the specifications
1.2.3 Do not touch the metal tips of the test leads when the meter is connected to the circuit to be measured.
1.2.4 Keep your fingers behind the probe barriers when taking a measurement with an effective voltage above 60V DC or 30V rms AC.
1.2.5 Do not take voltage measurement if the value between the terminals 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.
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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 selector to change functions.
1.2.9 Be careful that high voltage pulses at test points may damage the meter when measurements are being taken on the circuit of TV switch power.
1.2.10 Do not measure the resistance，capacitance, diode or continuity of live circuits.
1.2.11 Do not take capacitance measurements until the capacitor to be measured has been fully discharged.
1.2.12 Do not use the meter near explosive gases, steam or dirt.
1.2.13 Stop using the meter if any abnormalities or faults are observed.
1.2.14 Do not use the meter unless its rear case is securely fastened in its original position.
1.2.15 Do not store or use the meter in areas exposed to direct sunlight, at high temperature or with high relative humidity.
1.3 SYMBOLS
- important safety information; refer to the operation manual.
- dangerous voltage may be present.
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- double insulation（Protection class ΙΙ）.
CAT II - overvoltage (installation) category II, pollution
degree 2 per IEC1010-1, referring to the level of impulse withstand voltage protection provided.
CAT III - overvoltage (installation) category III, pollution
degree 2 per IEC1010-1, referring to the level of impulse withstand voltage protection provided.
- conforms to European Union Directive
- earth ground
- fuse
- battery low
1.4 MAINTENANCE
1.4.1 Do not attempt to remove the rear case to adjust or repair the meter. Such actions should only be performed 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 voltage and current at F 10A/250V (quick acting).
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1.4.5 Use damp cloth and mild detergent to clean the meter; do not use abrasives or solvents.
1.4.6 Turn the rotary selector to OFF position to switch off the power when the meter is not in use.
1.4.7 Remove the batteries to avoid damages to the meter if it will idle for a long time.
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DESCRIPTION
2. DESCRIPTION
- This meter is a portable professional measuring instrument with large LCD to show three lines of readings, as well as back light for easily reading. The ‘single-hand operation’ design for the range switch makes measurement simple and easy. Overload protection and low battery indication are provided. It is an ideal multi-function instrument with scores of practical applications for professional, workshop, school, hobby and home use.
- The meter is devised with light and sound alarm to prevent misconnection of test leads and provide additional protection against damages caused by improper operation.
- The 5 in 1 digital multi-tester has been designed to combine the functions of sound level, luminance, humidity and temperature meters, as well as a digital multimeter.
- The sound level function is applicable to measuring noise level in factories, schools, offices, airports and at 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
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measuring ambient humidity and temperature, as well as temperature of objects.
- The digital multimeter can perform measurements of AC/DC voltage and current, resistance，frequency, duty, capacitance, as well as continuity and diode test.
- Both the reading and unit of measurement are displayed on the LCD.
- Both auto range and manual range are available
- This meter is equipped with auto power off function.
- This meter is equipped with reading hold function.
- This meter is equipped with relative measurement function.
2.1 NAMES OF PARTS
1) LCD (Liquid-crystal display)
2) Auto/manual switch button (RANGE)
3) Relative measurement switch button (REL)
4) Reading hold/back light button (HOLD/B.L.)
5) Hz/duty switch button (Hz/DUTY)
6) Panel
7) Rotary selector
8) 10A input jack
9) mA/µA/TEMP input jack
10) COM input jack
11) V
、Ω、Hz、 、
input jack
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1000V
10A
CAT III
COMuA/mA
12) OFF - switch of power
13) Function switch button (SELECT)
14) ℃/℉ switch button (℃/℉)
15) Humidity & Temperature sensor
16) Light sensor
17) Microphone
2.2 SWITCH, BUTTONS AND INPUT JACKS
HOLD/B.L. Button
- for holding the reading or control backlight
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SELECT Button
- for switching among measuring functions
RANGE Button
- for switching 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
- for measuring voltage, resistance, frequency, duty,
capacitance, diode, and continuity. COM Input Jack
- common input connection for current, voltage,
resistance, frequency, duty, capacitance, diode, continuity, temperature measurement.
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Humidity Sensor
- for measuring humidity. Light Sensor
- for measuring luminance. Microphone
- for measuring sound level (dB).
2.3 LIQUID-CRYSTAL DISPLAY (LCD)
1) Temperature indicator
2) Humidity indicator
3) Main indicator
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~ 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 Illuminance units X10 Decuple n
、、、、µ、、、、m、、、、k、、、、
M Unit of measure prefixes: nano,
micro, milli, kilo and mega
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DIGITAL MULTIMETER
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SPECIFICATION
3. SPECIFICATIONS
Calibration is required once a year, to be carried out at a temperature between 18°C and 28 °C (64 °F to 82°F) and relative humidity below 75%.
3.1 GENERAL SPECIFICATIONS
3.1.1 The meter is devised with light and sound alarm to prevent test leads misconnection.
3.1.2 Auto range and manual range options are available.
3.1.3 Overrange protection is provided for all ranges.
3.1.4 Maximum voltage between terminals and earth ground: 1000V DC or rms AC
3.1.5 Operating altitude: max. 2000 meters (7000 ft.)
3.1.6 Display: LCD, 3 readings at the same time
3.1.7 Maximum value display: 3999 digits
3.1.8 Polarity indication: automatic; ‘-‘ for negative polarity.
3.1.9 Overrange indication: ‘0L’ or ‘-0L’
3.1.10 Sampling time: approx. 0.4 second per sample
3.1.11 Unit indication: function and unit.
3.1.12 Auto power 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 /℃
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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: 195×92×55mm
3.1.21 Weight: approximate 400g（including batteries）
3.2 TECHNICAL SPECIFICATIONS
Ambient temperature: 23±5℃ Relative humidity: < 75%
3.2.1 DC Voltage Range Resolution
400mV 0.1mV
4V 1mV
40V 10mV
400V 100mV
1000V 1V
- Input Impedance: 10MΩ
- Overload protection:
400mV range: 250V DC or rms AC, 4V-1000V ranges: 1000V DC or 750V rms AC.
- Max. input voltage: 1000V DC or 750V rms AC
NOTE:
At small voltage range, unsteady readings will 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.
± (0.7% of reading + 2 digits)
Accuracy
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3.2.2 AC Voltage Range Resolution
400mV 0.1mV
4V 1mV ± (0.8% of reading + 3 digits)
40V 10mV 400V 100mV 750V 1V ± (1.0% of reading + 3 digits)
- Input Impedance: 10MΩ
- Overload protection:
400mV range: 250V DC or rms AC, 4V-750V ranges: 1000V DC or rms 750V AC.
- Max. input voltage: 1000V DC or rms 750V AC
- Frequency range: 40 to 400Hz
- Response: average, calibrated in rms of sine wave
NOTE:
At small voltage range, unsteady readings will 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.
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Accuracy
3.2.3 DC Current Range Resolution 400µA 0.1µA
4000µA
40mA 10µA ±（1.2% of reading + 3 digits
400mA
4A 1mA
10A 10mA ±（2.0% of reading + 10 digits
- Overload protection:
µA、mA ranges: resettable fuses F1 500mA/250V 10A range: F2 10A/250V fuse (quick acting).
- Max. input current:
mA jack（µA ranges）: 4mA, mA jack（mA ranges）: 400mA, 10A jack: 10A
- voltage drop：
400µA ranges: 40mV, 4000µA ranges: 400mV, 40mA ranges: 40mV, 400mA ranges: 400mV, 4A range: 40mV 10A range: 100Mv
1µA
100µA
Accuracy
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