Tenma 72-2985 User Manual

Download

Page 1

Mini Clamp Meter

Model: 72-2985

Page 2

CONTENTS

Page Number Details

2 What’s Included

3 Important Safety Information

3 Technical Specication

4 Product Overview

5 LCD Overview

6 Operation - AC/DC Voltage Measurement

6 Resistance/Circuit On-Off/Diode/Capacitance

6 AC/DC Current Measurement

7 NCV Non-contact Electric Field Measurement

7 Other Functions

8 Technical Index

8 DC Voltage Measurement

8 AC Voltage Measurement

8 Resistance Measurement

9 Circuit On-Off, Diode Measurement

9 Capacitance Measurement

9 DC Current Measurement

9 AC Current Measurement

10 Cleaning & Maintenance

WHAT’S INCLUDED

• One mini clamp meter

• One pair of probe assemblies

• One zip case

• One user manual

Page 3

IMPORTANT SAFETY INFORMATION

Please read these instructions carefully before use and retain for future reference.

• When using electrical appliances basic safety precautions should always be followed.

• Use the meter only as specied in this manual, or the protection provided may be impaired.

• Do not operate the meter or use test leads if they appear damaged, or if the meter is not operating properly. Check before each use.

• There are no user-serviceable parts in this product. Refer servicing to qualied personnel.

• Do not use the clamp meter in a circuit with voltage higher than 600V or frequency higher than 400Hz.

• Be cautious when working in an environment with exposed conductors. Contact with conductors may result in electric shock.

• Use caution with voltages above 60V DC, 30V AC rms or 42V AC (peak value). These voltages pose a shock hazard.

• Before removing the battery cover, remove the clamp meter from all energized circuits and disconnect the lead.

• Replace the batteries as soon as the low battery indicator appears on the display.

• Fit a full set of batteries at one time.

• Remove dead batteries from the meter or if it is not going to be used for a long time.

• Never mix old and new batteries together, or different types of batteries.

• Never dispose of batteries in a re, or attempt to recharge ordinary batteries.

TECHNICAL SPECIFICATION

Max. voltage between input terminal and earthing

600V

Max. overload protection for clamp head terminals

100A

Max. display

2000 counts, update 2-3 times per second

Over range display Displays “OL”

Diode (approx) 3.2V

Range Automatic

Polarity Automatic

Work temperature 0°C ~ 40°C

Relative humidity 0°C ~ 30°C: 75%, 30°C ~ 40°C: 50%

Storage temperature -10°C ~ 50°C

Page 4

Electromagnetic compatibility (In

1V/m radio frequency eld)

Overall frequency = designated precision

+ 5%, radio frequency eld above 1V/m

has no designated index

Working altitude 0~2000m

Built-in batteries 2 x AAA 1.5V

Low battery LCD displays “ ”

Dimensions (approx.)

175 x 60 x 33.5mm, max. clamp head size is 17mm

Weight (approx.) 170g (including batteries)

PRODUCT OVERVIEW

10 11

1. Clamp head

2. Protective barrier

3. Clamp head trigger: press the trigger to open the

clamp head.

4. NCV Indicator: when the induced AC electric eld

intensity and induction distance satisfy the designated

value, the indicator will ash.

5. Function selection button: rotate to select the functions indicated.

6. HOLD/backlight key: press and hold to turn on or off the display backlight.

7. ZERO key: used for DC current zero, capacitance/ voltage measurement relative value.

8. SELECT key: select function mode, such as ACV/ DCV, resistance/on-off/diode/capacitance, ACA/DCA etc. in AC voltage and current gear. Press and hold for more than 2 seconds to enter or exit VFC function.

9. LCD screen

10. Positive terminal input jack: when measuring voltage, resistance/on-off/

capacitance/diode, insert the red meter plug into this jack.

11. Input jack at COM terminal: when measuring voltage, resistance/on-off/ capacitance/diode, insert the black meter plug into this jack.

12. Indication mark for geometric centre of clamp head.

72-2985

Page 5

LCD OVERVIEW

Indicator Meaning

TRMS True valid value measurement status

AC/DC AC/DC voltage measurement

Negative reading

Diode measurement

Circuit continuity measurement

Data hold

Ω kΩ MΩ Resistance unit

Hz, kHz, MHz Frequency unit

mV, V Voltage unit

mA, A Current unit

nF, µF, mF Capacitance unit

(EF) NCV Non-contact AC voltage induction

Auto Auto range

ZERO/REL Zero/relative measurement

VFC Variable frequency voltage/current measurement

Low battery

Auto power-off

Page 6

OPERATION - AC/DC VOLTAGE MEASUREMENT

• Select AC voltage or DC voltage range.

• Insert the red meter plug into the red jack (positive terminal) and the black meter plug into the black jack (COM terminal).

• Touch the test piece with the red and black meter plugs.

• Read the measurement value from the LCD.

• WARNING: When measuring voltage, the maximum input voltage is 600V (AC/DC). Do not exceed this limitation, otherwise it may cause an electric shock.

RESISTANCE/CIRCUIT ON-OFF/DIODE/CAPACITANCE

• Insert the red meter plug into the red jack (positive terminal) and the black meter plug into the black jack (COM terminal).

• Connect the meter plug in parallel to the test piece for measurement.

• Read the measurement value from the LCD screen.

• WARNING: When measuring resistance/on-off/ capacitance/diode range, do not input voltage over DC 60V or AC 30V to avoid injury.

AC/DC CURRENT MEASUREMENT

• Select AC range (2A~, 20A~, 100A~).

• Open the clamp head, insert the electric wire and close the clamp head.

• Ensure the electric wire is held in the geometric centre, indicated on the clamp head and make sure the clamp heads are closed.

• Read the measurement data from the LCD.

• Press SELECT to enter DC range (2A , 20A , 100A ).

• Press ZERO before measurement to set the reading to zero. If it does not return to zero after one press, then press it several times until the reading is zero. Note: As the product is highly sensitive, to ensure correct data measurement, the orientation of the meter during measurement should be the same as when zeroed.

Page 7

NCV NON-CONTACT ELECTRIC FIELD MEASUREMENT

• If you want to measure whether there is AC voltage/

electromagnetic eld, place the front end of the clamp head

8~15mm close to the test piece.

• When the amplitude of the inductive AC voltage is

approximately ≤ 100V, it displays “EF”.

• If the detected voltage is > 100V, it displays “-” and it has four “----” levels based on voltage with different buzzing at

each level with NCV light ashing to proportionate to the eld intensity.

• WARNING: When ranges switch to NCV measurement, unplug the test plug to avoid electric shock.

OTHER FUNCTIONS

• Press and hold the HOLD button for two seconds to turn on or off the LCD backlight function.

• Automatic power-off: If the rotary button has not been moved for 15 minutes the instrument will automatically switch off to save energy. Turn the rotary button to OFF, then select the required range, or press any button.

• To turn off the automatic power-off function, press and hold the SELECT key, then

turn the instrument on. You will hear five buzzing sounds, which means the

automatic power-off function has been cancelled.

• Turn off and restart the meter, and the automatic power-off function will be reenabled.

• The buzzer will send out five warnings one minute before the automatic power-off. A long buzz will then be heard before turning off. When the automatic power-off

function is cancelled, you will hear five continuous warnings every 15 minutes.

• Buzzer: press any button or rotate the function switch. If such function key is valid, the buzzer will beep once. When the circuit under test is conductive (<10Ω), the buzzer will sound continuously.

• When measuring voltage or current out of range, the buzzer will beep to indicate this.

- When AC or DC voltage is >600V, the buzzer will beep.

- When AC or DC current is >100A, the buzzer will beep.

• Low voltage detection: when the battery voltage is lower than 2.5V, the low battery symbol appears. Measurement accuracy may be lower once this symbol shows, so replace the battery as soon as possible. If it is lower than 2.2V, only the low battery symbol will show after starting up and the instrument will not work.

• When the battery supply voltage lowers to 2.6V, the LCD backlight will be in weak or non-functional state, but the measurement functions will still work.

• Open the clamp head, insert the electric wire and close the clamp head.

• Ensure the electric wire is held in the geometric centre, indicated on the clamp head and make sure the clamp heads are closed.

• Read the measurement data from the LCD. When the reading is positive it means

the current ows from the positive side to the negative side and vice versa.

Page 8

TECHNICAL INDEX

• Accuracy: ± (a% reading + b count).

• Environment temperature: 23°C ± 5°C (73.4°F ± 9°F), relative humidity: ≤75%.

DC VOLTAGE MEASUREMENT

Range Resolution Accuracy

200.0mV 0.1mV ± (0.7% + 5)

2.000V 1mV

± (0.7% + 3)

20.00V 10mV

200.0V 100mV

600V 1V

• Input impedance: approx. 10MΩ.

• As the input impedance on the meter is high, when measuring a source of lower voltage

and lower impedance (less than 10MΩ), the

measurement may be unstable for a short time, but will stabilize.

• Warning: Maximum input voltage: ±600V

AC VOLTAGE MEASUREMENT

Range Resolution Accuracy

2.000V 1mV ± (1.0% + 3)

20.00V 10mV

200.0V 100mV

± (1.0% + 3)

VFC mode:

± (4.0% + 3)

600V 1V

± (1.2% + 3)

VFC mode:

± (4.0% + 3)

• Input impedance: approx. 10MΩ.

• Show true virtual value: frequency response: 45~400Hz.

• Accuracy guarantee range: 5-100% range, short circuit allows <10 residue readings.

• Non-sinusoidal wave counts add error by crest factor:

- When crest factor is 1~2, add 3%.

- When crest factor is 2~2.5, add 5%.

- When crest factor is 2.5~3, add 7%.

• Warning: Maximum input voltage: 600Vrms.

RESISTANCE MEASUREMENT

Range Resolution Accuracy

200.0Ω 0.1Ω

± (1.0% + 2)

2.000kΩ 1Ω

20.00kΩ 10Ω

200.0kΩ 100Ω

2.000MΩ 1kΩ

± (1.2% + 3)

20.00MΩ 10kΩ

• Range: measured value = measurement display value - meter pen short circuit value.

• Open circuit voltage is about 1V.

• Overload protection: 600Vrms.

Page 9

CIRCUIT ON-OFF DIODE MEASUREMENT

Range Resolution Remarks

0.1Ω

Resistance value for circuit disconnect:

>150Ω, buzzer makes no sound.

1mV

Open circuit voltage is 3.2V: normal voltage for silicon PN junction is

0.5~0.8V.

• Overload protection: 600V rms

CAPACITANCE MEASUREMENT

Range Resolution Accuracy

2nF 1pF ± (4.0% + 10)

20.00nF~200.0µF 10pF~100nF ± (4.0% + 5)

2.000mF~20.00mF 1µF~10µF ± 10%

• Overload protection: 600V rms

• ≤1µF measured capacitance. It is suggested to use ZERO measurement mode to ensure accuracy.

DC CURRENT MEASUREMENT

Range Resolution Accuracy

2.000A 1mA ± (2.0% + 8)

20.00A 10mA ± (2.0% + 3)

100.0A 100mA ± (2.0% + 3)

• Overload protection: 100A.

• Accuracy warranty coverage: 5~100% range, 2A open circuit allows <20 residue readings.

• Displays are rms value. Frequency response: 50~60Hz.

• Non-sinusoidal wave counts add error by crest factor:

- When crest factor is 1~2, add 3%.

- When crest factor is 2~2.5, add 5%.

- When crest factor is 2.5~3, add 7%.

• Overload protection: 100A.

• Due to the presence of external electromagnetic elds, press ZERO before measurement to ensure accuracy of measurement. Note: If the reading does not zero after the initial press, press it several times until the reading is zero.

• The orientation of the meter during measurement should be the same as when zeroed.

AC CURRENT MEASUREMENT

Range Resolution Accuracy

2.000A 1mA

± (3.0% + 10)

VFC mode: ±

(4.0% + 10)

20.00A 10mA

± (2.5% + 8)

VFC mode: ±

(4.0% + 10)

100.0A 100mA

± (2.5% + 5)

VFC mode: ±

(4.0% + 10)

Page 10

CLEANING & MAINTENANCE

WARNING: Before removing the rear cover of the instrument, make sure that the meter is switched off, the meter plugs have been removed from the input port and the lead disconnected from the circuit under test.

• To clean the instrument, use a clean damp cloth and a mild detergent.

• Do not use any chemicals, abrasives or solvents that could damage the meter.

• If any maintenance is required, refer to qualied personnel.

Replacing the Batteries

• When the LCD displays the low battery symbol, replace the batteries immediately to preserve measurement accuracy.

• Move the rotary switch to the “OFF” position and remove the meter plug from the input jack.

• Unscrew the screw on the rear cover of the battery and remove the old batteries.

• Replace both batteries with replacements

of the same specication (AAA 1.5V).

INFORMATION ON WASTE DISPOSAL FOR CONSUMERS OF ELECTRICAL & ELECTRONIC EQUIPMENT.

This symbol indicates that separate collection of Waste Electrical and Electronic Equipment (WEEE) or waste batteries is required. Do not dispose of these items with general household waste. Separate for the treatment, recovery and recycling of the materials used. Waste batteries can be returned to any waste battery recycling point which are provided by most battery retailers. Contact your local authority for details of the battery and WEEE recycling schemes available in your area.

Made in China. www.premierfarnell.com

V.1.0