Extech Instruments MA400 User manual

User’s Guide

MiniAmp™ Series

Clamp-on Multimeters

Models:

MA400

MA420

MA440

MA460+

MA Series V2.0 7/02

WARRANTY

EXTECH INSTRUMENTS CORPORATION warrants this

instrument to be free of defects in parts and workmanship for one

year from date of shipment (a six month limited warranty applies

on sensors and cables). If it should become necessary to return

the instrument for service during or beyond the warranty period,

contact the Customer Service Department at (781) 890-7440 ext.

210 for authorization. A Return Authorization (RA) number must

be issued before any product is returned to Extech. The

sender is responsible for shipping charges, freight, insurance and

proper packaging to prevent damage in transit. This warranty does

not apply to defects resulting from action of the user such as

misuse, improper wiring, operation outside of specification,

improper maintenance or repair, or unauthorized modification.

Extech specifically disclaims any implied warranties or

merchantability or fitness for a specific purpose and will not be

liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the

product. The warranty set forth above is inclusive and no other

warranty, whether written or oral, is expressed or implied.

reserved including the right of reproduction in whole or in

part in any form.

MA Series V2.0 7/02

Introduction

Congratulations on your purchase of Extech model MA400,

MA420, MA440 or MA460+ clamp-on multimeter. Properly used,

this meter will provide many years of reliable service.

Clamp meter functions common to all meters:

Autoranging

AC Current Measurements

Data Hold

Auto Power Off

Maximum Hold captures 30ms peaks

1.1" (28mm) Jaw size

MultiMeter functions common to all models:

AC/DC Voltage to 600V

Resistance to 40MΩ

Capacitance and Frequency tests

Features unique to the MA440 and MA460+ models:

Twin 4000 count LCD displays

Simultaneous display of Current/Voltage, Current/Resistance, or

Current/Temperature (MA460+)

Features common to the MA400 and MA420 models:

Single 4000 count LCD display

Relative zero function

True rms (MA420) for current and voltage measurements

Safety

International Safety Symbols

!Caution ! Refer to the explanation in this Manual

Warning ! Risk of electric shock

Earth (Ground)

Double Insulation or Reinforced insulation

Fuse

AC--Alternating Current

DC--Direct Current

MA Series V2.0 7/02

Safety Precautions

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

injury or death. Read and understand this users 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 600V 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

MA Series V2.0 7/02

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

MA Series V2.0 7/02

Specifications

DC Voltage

RANGE Accuracy

400.0mV 0.3% + 4d

4.000V, 40.00V, 400.0V 0.5% + 3d

600V 1.0% + 4d

NMRR: >50dB @ 50/60Hz, CMRR: >120dB @ DC, 50/60Hz,

Rs=1kΩ

Input impedance: 10MΩ, 30pF nominal, 1000MΩon the 400.0mV

range.

AC Voltage

RANGE (50Hz to 500Hz) Accuracy

4.000V, 40.00V, 400.0V 1.5% + 5d

600V 2.0% + 5d

CMRR: >60dB @ DC to 60Hz, Rs=1kΩ, Input Impedance:

10MΩ, 30pF nominal, True RMS models specified from 5% to

100% of range

AC Current (Clamp-on)

RANGE (50/60Hz) Accuracy

40.00A 1.9% + 8d

400.0A 1.9% + 8d*

600A** unspecified

True RMS model specified from 10% to 100% of range

*Accuracy specified to 350A continuous and 400A for 60 seconds

max with a 5 minute cool down interval.

** Added range to indicate instantaneous over-range current

values.

Resistance

RANGE Accuracy

400.0Ω0.8% + 6d

4.000kΩ, 40.00kΩ, 400.0kΩ, 0.6% + 4d

4.000MΩ, 1.0% + 4d

40.00MΩ, 2.0% + 4d

Open circuit voltage: 0.4V typical.

MA Series V2.0 7/02

Capacitance

RANGE Accuracy*

500.0nF, 5.000µF, 50.00µF, 500.0µF,

3000µF 3.5%* + 6d

50.00nF Not specified

*Accuracies with a film capacitor or better

*Specified with battery voltage above 2.8V (approximately half full

battery). Accuracy decreases gradually to 12% at low battery

warning voltage of approximately 2.4V.

Frequency

Function Sensitivity

(ACrms)

Range

400.0mV 150mV 10Hz to 2kHz

4.000V 3.2V 5Hz to 40kHz

40.00V 25V 5Hz to 100kHz

400.0V 100V 5Hz to 100kHz

600V 400V 5Hz to 5kHz

400µA (MA440&460+) 500µA 10Hz to 30kHz

2000µA (MA440&460+) 500µA 10Hz to 30kHz

400.0A (MA400&420) 55A 40Hz to 400Hz

Display counts: 4999, Max resolution: 0.001Hz,

Accuracy: 0.5% + 4d

Temperature (MA460+ only)

RANGE Accuracy

-4°F to 573°F 2% + 6°F

-20°C to 300°C 2% + 3°C

Accuracy does not include the type K thermocouple accuracy

DC µA (MA440 & MA460+ only)

RANGE Accuracy Burden Voltage

400.0µA 1.5% + 4d

2000µA 1.2% + 3d

2.8mV/µA

AC µA (MA440 & MA460+ only)

RANGE (50 to 500Hz) Accuracy Burden Voltage

400.0µA 2.0% + 5d

2000µA 1.5% + 5d

2.8mV/µA

MA Series V2.0 7/02

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

digits), or as otherwise specified, at 23°C ±5°C < 75% R.H.

Model MA420 True RMS accuracies are specified from 10%

to 100% of range or as otherwise specified. Maximum Crest

Factor <1.75:1 at full scale & <3.5:1 at half scale (with

frequency component within the specified frequency

bandwidth for non-sinusoidal waveforms).

Audible Continuity: Threshold between 10Ωand 120Ω.

Response time < 100µs

Diode Test: Open circuit voltage < 1.6VDC; Test

current 0.25mA (typical)

Max Hold: Accuracy + 50 digits for changes >

25ms in duration

Digital Display: 4000-count LCD display(s); 3 per

second nominal refresh rate

Low Battery: Below approx. 2.4V

Operating Temperature: 32°to 104°F (0°to 40°C)

Storage Temperature: -4°to 140°F (-20 to 60oC), <80% R.H.

(with battery removed)

Relative Humidity: 80% to 88°F (31oC), decreasing

linearly to 50% at 104°F (40oC)

Altitude: Operating below 2000 meters

Temp. Coefficient: Nominal 0.15 x specified accuracy per

ºC (between 0 and 18oC or 28 to

40oC), or as otherwise specified

AC Sensing: True RMS on MA420, Average

sensing on MA400, MA440 and

MA460+

Auto Power Off: After 30 minutes of inactivity

MA Series V2.0 7/02

Safety: The MiniAmp™ Series meters meet

IEC61010-032(1994), EN61010-2-

032(1995), UL3111-2-032(1999).

MA440 and MA460+: Category III

600V AC & DC

MA400 and MA420: Category II 600V

AC & DC and Category III 300V AC &

E.M.C.: Meets EN61326(1997, 1998/A1),

EN61000-4-2(1995), and EN61000-4-

3(1996)

In an RF field of 1V/m:

Capacitance function is not specified

µA function: Total accuracy = Acc.+50

digits

Other functions: Total acc. = Acc+ 30

digits

Performance above 1V/m is not

specified.

Overload Protection: ACA Clamp-on jaws; AC 400A

continuous

+, COM and µA terminals; 600VDC/AC

rms

Power Supply 1.5V alkaline button batteries (IEC/JIS

LR44, GAP76 or V13GA). Two

batteries for MA400 & MA420, four

batteries for MA440

3V CR2032 button battery x2 for

MA460+

Power Consumption: 2.5 mA typical. Power consumption

during auto-power off; 0.8µA (typical).

25µA typical on the MA460+

temperature function and 150µA

typical on the MA440 voltage and

current functions

Dimension: L7.5 x W2.5 x H1.26" (190mm x 63mm

x 32mm)

Weight: 6.6oz. (187g)

MA Series V2.0 7/02

Meter Description

MA440 and MA460+ (double display models)

1. Clamp jaw

2. Jaw trigger

3. ACA LCD display

4. Multimeter LCD display

5. Select button

6. Multimeter function switch

7. Multimeter input jacks

8. Hz button

9. Clamp power button

10. Data Hold/Max Hold button

MA400 and MA420 (single display models)

1. Clamp jaw

2. Jaw trigger

3. LCD display

4. Select button

5. Multimeter function switch

6. Multimeter input jacks

7. Hz button

8. Relative button

9. Data Hold/Max Hold button

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