Extech Instruments MultiLog ML720 Manual de usuario

User’s Guide

MultiLog™ Digital MultiMeter

With built-in Datalogger

Model ML720

Introduction

Congratulations on your purchase of Extech model ML720 True rms

datalogging digital multimeter. Properly used, this meter will provide many

years of reliable service.

The MultiLog™ measures AC/DC Voltage/Current, Resistance,

Frequency, Capacitance, Temperature, Diode, and Continuity. The

MultiLog™ offers a built-in datalogger and an optical RS-232 interface.

The meter stores 43,000 data points in internal memory.

Safety

International Safety Symbols

This symbol, adjacent to another symbol or terminal, indicates the

user must refer to the manual for further information.

This symbol, adjacent to a terminal, indicates that, under normal

use, hazardous voltages may be present

Double insulation

Safety Precautions

1. Improper use of this meter can cause damage, shock, injury or death.

Read and understand this user’s manual before operating the meter.

2. Make sure any covers or battery doors are properly closed and

secured.

3. Always remove the test leads before replacing the battery or fuses.

4. Inspect the condition of the test leads and the meter itself for any

damage before operating the meter. Repair or replace any damage

before use.

5. Do not exceed the maximum rated input limits.

6. Use great care when making measurements if the voltages are

greater than 25VAC rms or 35VDC. These voltages are considered a

shock hazard.

7. Always discharge capacitors and remove power from the device

under test before performing Capacitance, Diode, Resistance or

Continuity tests.

8. Remove the battery from the meter if the meter is to be stored for

long periods.

9. To avoid electric shock, do not measure AC current on any circuit

whose voltage exceeds 500V AC.

10. Voltage checks on electrical outlets can be difficult and misleading

because of the uncertainty of connection to the electrical contacts.

Other means should be used to ensure that the terminals are not

"live".

11. The product is intended only for indoor use

12. If the equipment is used in a manner not specified by the

manufacturer, the protection provided by the equipment may be

impaired.

13. Pollution degree: 2

PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY

OVERVOLTAGE CATEGORY I

Equipment of OVERVOLTAGE CATEGORY I is equipment for

connection to circuits in which measures are taken to limit the transient

overvoltages to an appropriate low level. Note – Examples include

protected electronic circuits.

OVERVOLTAGE CATEGORY II

Equipment of OVERVOLTAGE CATEGORY II is energy-consuming

equipment to be supplied from the fixed installation.

Note – Examples include household, office, and laboratory appliances.

OVERVOLTAGE CATEGORY III

Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed

installations.

Note – Examples include switches in the fixed installation and some

equipment for industrial use with permanent connection to the fixed

installation.

OVERVOLTAGE CATEGORY IV

Equipment of OVERVOLTAGE CATEGORY IV is for use at the origin of

the installation.

Note – Examples include electricity meters and primary over-current

protection equipment

Specifications

DC VOLTAGE

RANGE Accuracy

50.00 mV 0.12% + 2d

500.0 mV 0.06% + 2d

5.000V, 50.00V, 500.0V, 1000V 0.08% + 2d

NMRR: >60dB @ 50/60Hz, CMRR: >120dB @ DC, 50/60Hz, Rs=1kΩ

Input impedance: 10MΩ, 16pF nominal (44pF nominal for 50mV & 500mV

ranges)

AC VOLTAGE

*Specified from 30% to 100% of range

CMRR: >60dB @ DC to 60Hz, Rs=1kΩ

Input Impedance: 10MΩ, 16pF nominal (44pF nominal for 50mV &

500mV ranges)

DC CURRENT

RANGE Accuracy Burden Voltage

500.0µA, 5000µA 0.15mV/µA

50.00mA, 500.0mA 3.3mV/mA

5.000A, 10.00A* 0.2% + 4d 0.03V/A

*10A continuous, 20A for 30 seconds max with a 5 minute cool down

interval

RANGE Accuracy

50Hz/60Hz

50.00mV, 500.0mV, 5.000V, 50.00V, 500.0V, 1000V 0.5% + 3d

40Hz to 500Hz

50.00mV, 500.0mV 0.8% + 3d

5.000V, 50.00V, 500.0V 1.0% + 4d

1000V 1.2% + 4d

Up to 20kHz

50.00mV, 500.0mV 0.5dB*

5.000V, 50.00V, 500.0V 3dB*

1000V Unspecified

AC CURRENT

RANGE Accuracy Burden Voltage

50 / 60Hz

500.0µA, 5000µA 0.6%+3d 0.15mV/µA

50.00mA, 500.0mA 0.6%+3d 3.3mV/mA

5.000A, 10.00A* 0.6%+3d 0.03V/A

40Hz to 1kHz

500.0µA, 5000µA 0.8%+4d 0.15mV/µA

50.00mA 0.8%+4d 3.3mV/mA

500.0mA 1.0%+4d 3.3mV/mA

5.000A, 10.00A* 0.8%+4d 0.03V/A

*10A continuous, 20A for 30-second max with 5 minute cool down interval

TEMPERATURE

RANGE Accuracy

-50°C TO 1000°C 0.3% + 3d

-58°F TO 1832°F 0.3% + 6d

RESISTANCE

RANGE Accuracy

50.00Ω0.2% + 6d

500.0Ω0.1% + 3d

5.000kΩ, 50.00kΩ, 500.0kΩ0.1% + 2d

5.000MΩ0.4% + 3d

50.00MΩ1.5% + 5d

Open Circuit Voltage: < 1.3VDC (< 3VDC for 50Ω& 500Ωranges)

CAPACITANCE

RANGE Accuracy*

50.00nF, 500.0nF 0.8% + 3d

5.000µF 1.0% + 3d

50.00µF 2.0% + 3d

500.0µF 3.5% + 5d

9999µF 5.0% + 5d

*Accuracies with film capacitor or better

FREQUENCY

Function Sensitivity

(ACrms) Range

mV 300mV 10Hz - 125kHz

5V 2V 10Hz - 125kHz

50V 20V 10Hz - 20kHz

500V 80V 10Hz - 1kHz

1000V 300V 10Hz - 1kHz

Ω, Cx, diode 300mV 10Hz - 125kHz

µA, mA, A 10% F.S. 10Hz - 125kHz

Accuracy: 0.01% + 2d

Accuracy Notes: Accuracy is ±(% reading digits + number of digits), or

as otherwise specified, at 23°C ±5°C < 75% R.H. True RMS accuracies

are specified from 5% to 100% of range or as otherwise specified.

Maximum Crest Factor <3:1 at full scale & <6:1 at half scale (with

frequency component within the specified frequency bandwidth for non-

sinusoidal waveforms).

Audible Continuity:

Measurement threshold: Beeper will sound if measurement is below

20Ω. Beeper will not sound if measurement is above 200Ω. Beeper

may or may not sound if measurement is between 20 and 200Ω.

Response time: < 100µs

Digital Display: 5000-count LCD display; 5 per second

nominal refresh rate

Bar Graph Display: 52-segment bargraph; 60 per second nominal

refresh rate

Datalogging Capacity: 43000 points

Datalog Sample Rate: 0.05 (0.2 for oC/oF & Ω, 0.4 for HZ and 1 for

C), 1, 20, 40, 60, 120, 240 & 480 seconds

Low Battery: Below approx. 7V

Operating Temperature: 32°to 113°F (0°to 45°C)

Storage Temperature: -4°to 140°F (-20 to 60oC

Relative Humidity: Max 80% up to 87ºF (31ºC) decreasing

linearly to 50% at 113ºF (45ºC) <80% storage

Altitude: Operating below 2000 meters

Temp. Coefficient:Nominal 0.15 x specified accuracy per ºC (between

0 and 18oC or 28 to 50oC), or as otherwise specified

Power Supply: 9V battery (NEDA1604, JIS006P or IEC6F22)

AC Sensing: True RMS

Auto Power Off: After 17 minutes of inactivity with no input signal

Safety: Intended for indoor use and protected by double insulation per

EN61010-1 and IEC61010-1 2nd Edition (2001) to CAT III

1000V & CAT IV 600V. The meter also meets UL3111-1(1994)*

and CSA C22.2 No. 1010-1-92* to CAT III 1000V.

Terminals (to COM) ratings:

V : CATEGORY III 1000 VOLTS AC & DC, AND

CATEGORY IV* 600 VOLTS AC & DC.

A / MAµA : CATEGORY III AND CATEGORY IV* 500

VOLTS AC AND 300 VOLTS DC.

*Category IV safety standard (for DMMs) was first released in

IEC61010-1 2nd Edition in year 2001, and was yet a UL published

standard at the time this manual was written.

UL Certification: Meters that bear the UL marking have been

investigated by UL headquarter in the USA per UL

standard UL3111-1 1st Ed to its highest CAT III rating

and international standard IEC61010-1 Second Edition

(year 2001) to CAT IV rating. The UL markings on the

meter, where applicable, are marked as “UL Listed Cat

III only” and “UL Classified to IEC61010-1 2nd Ed. Cat

IV”.

E.M.C.: Meets EN61326(1997, 1998/A1), EN61000-4-2(1995) and

EN61000-4-3(1996). Also meets former standards EN55011

(1991) and EN50082-1(1997)

In an RF field of 3V/m: Capacitance function is not specified

Other function ranges: Total Accuracy = Specified Accuracy + 30

digits. Performance > 3V/m is not specified

Overload Protection:

µA/mA Range: 0.63/500V, IR 200kA, F fuse

A Range: 12.5A/500V IR 20kA, F fuse

V Range: 1050V rms, 1450V peak

mV, Ωand other: 600VDC/VAC rms

Power Consumption: 2.7mA typical

Dimension: 7.32 x 3.43 x 1.4" with holster (186mm x 87mm x 35.5mm)

Weight: 15.17 oz. with holster (430g)

Meter Description

1. 5000 count Liquid Crystal display

2. Function push-buttons

3. Rotary function switch

4. 10A input jack

5. V/Hz/Ω/Cap/Temp input jack

6. COM input jack

7. mA/uA current input jack

8. RS232 connector (rear)

Features

Analog Bargraph display

Visual indication of measurement in the tradition of an analog meter

pointer. The bargraph consists of 52 discrete viewing segments. The

bargraph is useful for detecting faulty contacts, identifying

potentiometer gradations, and viewing signal spikes.

True RMS vs. Average Sensing (AC Measurements)

True RMS meters can accurately measure non-sinusoidal waveforms,

as well as distorted sine waves that contain harmonics. Average

Sensing is a fast, accurate and cost effective method of measuring

pure sine wave signals. However, non-sinusoidal waveforms cannot

accurately be measured using Average-sensing techniques.

Backlit display

The MultiLog™ is equipped with a backlight for viewing the LCD

display in poorly lit areas.

Data Hold

The HOLD function freezes the reading on the display for later

viewing.

Manual and Automatic Ranging

The MultiLog™ series multimeters are Autoranging, with manual

override.

Smart Power Auto Power Off

Smart Power shuts the meter down automatically after approximately

17 minutes of inactivity.

Audible Beeper

To disable the audible meter tones, press and hold the Hz key while

powering the meter.

Automatic Test Lead Resistance Compensation

Automatically compensates for the resistance of the test leads, as well

as the internal protection circuitry automatically, ensuring greater

accuracy of low resistance measurements.

Datalogging

The MultiLog™ series of multimeters store reading for review on the

LCD display or downloading to a pc using the supplied software.

Operation

Measurement Considerations

NOTICE: Read and understand all warning and caution statements

listed in the safety section of this operation manual prior to using this

meter.

1. Always move the rotary function switch to the OFF position when the

meter is not in use. This meter has Auto Power OFF that

automatically shuts the meter OFF if 17 minutes elapse without

activity.

2. If "OL" appears on the display during a measurement, the

measurement exceeds the range selected. Change to a higher range.

AC/DC Voltage Measurements

1. Insert the black test lead into the negative COM jack and the red test

lead into the positive Vjack.

2. Set the function switch to the "VAC" "VDC" "mV" position. Press the

SELECT key momentarily to toggle between AC and DC.

3. Read the voltage measurement on the display

AC/DC Current Measurements

CAUTION: Do not make current measurements at 20A for longer than

30 seconds. Exceeding 30 seconds may cause damage to the meter

and/or the test leads.

1. Insert the black test lead into the negative COM jack.

2. For current measurements up to 4000µA, set the function switch to

the "µA" position and insert the red test lead into the mA-µAjack.

3. For current measurements up to 400mA, set the function switch to the

"mA" position and insert the red test lead into the mA-µAjack.

4. For current measurements up to 10A, set the function switch to the

"A" position and insert the red test lead into the Ajack.

5. Press the SELECT key momentarily to toggle between AC and DC.

6. Remove power from the circuit under test and open the circuit at the

point where you wish to measure current.

7. Touch the black test probe tip to the negative side of the circuit and

touch the red test probe tip to the positive side of the circuit.

8. Apply power to the circuit.

9. Read the current on the display

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