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Users Manual

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AM-270

Industrial Multimeter with

Bar-graph Display

AM-270

Industrial Multimeter

with Bar-graph Display

Users Manual

May 2010, Rev.1

English

Limited Warranty and Limitation of Liability

Your Amprobe product will be free from defects in material and workmanship for 1

year from the date of purchase. This warranty does not cover fuses, disposable batteries

or damage from accident, neglect, misuse, alteration, contamination, or abnormal

conditions of operation or handling. Resellers are not authorized to extend any other

warranty on Amprobe’s behalf. To obtain service during the warranty period, return the

product with proof of purchase to an authorized Amprobe Test Tools Service Center or

to an Amprobe dealer or distributor. See Repair Section for details. THIS WARRANTY

IS YOUR ONLY REMEDY. ALL OTHER WARRANTIES - WHETHER EXPRESS, IMPLIED OR

STAUTORY - INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE

OR MERCHANTABILITY, ARE HEREBY DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE

FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES,

ARISING FROM ANY CAUSE OR THEORY. Since some states or countries do not allow the

exclusion or limitation of an implied warranty or of incidental or consequential damages,

this limitation of liability may not apply to you.

Repair

All test tools returned for warranty or non-warranty repair or for calibration should be

accompanied by the following: your name, company’s name, address, telephone number,

and proof of purchase. Additionally, please include a brief description of the problem or

the service requested and include the test leads with the meter. Non-warranty repair or

replacement charges should be remitted in the form of a check, a money order, credit

card with expiration date, or a purchase order made payable to Amprobe® Test Tools.

In-Warranty Repairs and Replacement – All Countries

Please read the warranty statement and check your battery before requesting repair.

During the warranty period any defective test tool can be returned to your Amprobe®

Test Tools distributor for an exchange for the same or like product. Please check the

“Where to Buy” section on www.amprobe.com for a list of distributors near you.

Additionally, in the United States and Canada In-Warranty repair and replacement units

can also be sent to a Amprobe® Test Tools Service Center (see next page for address).

Non-Warranty Repairs and Replacement – US and Canada

Non-warranty repairs in the United States and Canada should be sent to a Amprobe® Test

Tools Service Center. Call Amprobe® Test Tools or inquire at your point of purchase for

current repair and replacement rates.

In USA In Canada

Amprobe Test Tools Amprobe Test Tools

Everett, WA 98203 Mississauga, ON L4Z 1X9

Tel: 888-993-5853 Tel: 905-890-7600

Fax: 425-446-6390 Fax: 905-890-6866

Non-Warranty Repairs and Replacement – Europe

European non-warranty units can be replaced by your Amprobe® Test Tools distributor

for a nominal charge. Please check the “Where to Buy” section on www.amprobe.com for

a list of distributors near you.

Amprobe® Test Tools Europe

In den Engematten 14

79286 Glottertal, Germany

tel: +49 (0) 7684 8009 - 0

*(Correspondence only – no repair or replacement available from this address. European

customers please contact your distributor.)customers please contact your distributor.)

AM-270 Industrial Multimeter with Bar-graph Display

1 3-4/5 digits 5000 counts LCD display

2 Push-buttons for special functions & features

3 Selector to turn the Power On or Off and select a function

4 Input Jack for 10A (20A for 30sec) current function

5 Input Jack for all functions EXCEPT current (µA, mA, A) functions

6 Common (Ground reference) Input Jack for all functions

7 Input Jack for milli-amp and micro-amp current functions

CONTENTS

SYMBOLS ...............................................................................................................1

UNPACKING AND INSPECTION .............................................................................3

FEATURES ...............................................................................................................3

OPERATION ............................................................................................................4

DC Voltage, AC Voltage, & Hz Frequency Functions .......................................4

Capacitance, Diode Test Function ......................................................5

Temperature Function .....................................................................................6

 Resistance, Continuity Functions ............................................................8

Auto Leads Resistance Calibration ...................................................................8

µA, mA, and A Current Functions ...................................................................9

PC-COMM Computer Interface Capabilities ...................................................10

50ms MAX/MIN at Fast 20/s Measurement Mode ...........................................10

0.8ms CREST Capture Mode ............................................................................10

Backlighted Displaye ........................................................................................11

Hold ..............................................................................................................11

Zoom 5x Analog Pointer ...................................................................................11

Relative Mode ..............................................................................................12

Manual or Auto-Ranging .................................................................................12

Beep-Jack™ Input Warning ..............................................................................13

Set Beeper Off ...................................................................................................13

Auto Power Off (APO) ......................................................................................13

Disabling Auto Power Off ................................................................................13

SPECIFICATION .......................................................................................................13

MAINTENANCE AND REPAIR ................................................................................19

Trouble Shooting...............................................................................................19

Cleaning and Storage .......................................................................................20

Battery and Fuse Replacement .........................................................................20

SYMBOLS

Caution ! Risk of electric shock

Caution ! Refer to the explanation in this Manual

Double Insulation or Reinforced insulation

Alternating Current (AC).

Direct Current (DC).

Fuse

Earth (Ground)

Please remove all the test leads before preforming maintenance,

cleaning, battery replacement, fuse replacement, etc

Complies with European Directives

Conforms to relevant Australian standards

Do not dispose of this product as unsorted municipal waste.

Contact a qualified recycler for disposal

Safety Information

This manual contains information and warnings that must be followed for

operating the instrument safely and maintaining the instrument in a safe

operating condition. If the instrument is used in a manner not speciﬁed by the

manufacturer, the protection provided by the instrument may be impaired.

The meter is intended only for indoor use.

The meter protection rating, against the users, is double insulation per

IEC61010-1 2nd Ed., EN61010-1 2nd Ed., UL61010-1 2nd Ed. and CAN/CSA C22.2

No. 61010.1-0.92 to Category III 1000 Volts AC & DC and Category IV 600 Volts

AC & DC.

Measurement category:

V : Category III 1000 Volts AC & DC, and Category IV 600 Volts AC & DC.

A / mAµA : Category III and Category IV 600 Volts AC and 300 Volts DC.

Per IEC61010-1 2nd Ed. (2001) Measurement Category

Measurement Category IV (CAT IV) is for measurements performed at the

source of the low-voltage installation. Examples are electricity meters and

measurements on primary overcurrent protection devices and ripple control

units.

Measurement Category III (CAT III) is for measurements performed in the

building installation. Examples are measurements on distribution boards,

circuit- breakers, wiring, including cables, bus-bars, junction boxes, switches,

socket-outlets in the ﬁxed installation, and equipment for industrial use

and some other equipment, for example, stationary motors with permanent

connection to the ﬁxed installation.

Measurement Category II (CAT II) is for measurements performed on circuits

directly connected to the low voltage installation. Examples are measurements

on household appliances, portable tools and similar equipment.

WARNING

To reduce the risk of ﬁre or electric shock, do not expose this product to

rain or moisture. To avoid electrical shock hazard, observe the proper

safety precautions when working with voltages above 60 VDC or 30 VAC

rms. These voltage levels pose a potential shock hazard to the user. Do

not touch test lead tips or the circuit being tested while power is applied

to the circuit being measured. Keep your ﬁngers behind the ﬁnger guards

of the test leads during measurement. Inspect test leads, connectors,

and probes for damaged insulation or exposed metal before using the

instrument. If any defects are found, replace them immediately. Do not

measure any current that exceeds the current rating of the protection

fuse. Do not attempt a current measurement to any circuit where

the open circuit voltage is above the protection fuse voltage rating.

Suspected open circuit voltage should be checked with voltage functions.

Never attempt a voltage measurement with the test lead inserted into

the µA/mA or A input jack. Only replace the blown fuse with the proper

rating as speciﬁed in this manual. Only use the accompanied test leads, or

replace with the same rating or better.

CAUTION

Disconnect the test leads from the test points before changing functions.

Always set the instrument to the highest range and work downward for

an unknown value when using manual ranging mode.

CENELEC Directives

The instruments conform to CENELEC Low-voltage directive 2006/95/EC and

Electromagnetic compatibility directive 2004/108/EC

UNPACKING AND INSPECTION

Your shipping carton should include:

1 AM-270 Meter

1 Test Leads (1 pair)

1 K Type thermal couple with banana plug

1 Users Manual

1 Single Alkaline 9V battery; NEDA1604A, JIS6AM6 OR IEC6LF22(Installed)

If any of the items are damaged or missing, return the complete package to

the place of purchase for an exchange.

FEATURES

Analog Bar-graph

MS (Root-Mean-Square) is the term used to describe the effective or equivalent

DC value of an AC signal. Most digital multimeters use average sensing RMS

calibrated technique

Average Sensing RMS Calibrated

RMS (Root-Mean-Square) is the term used to describe the effective or equivalent

DC value of an AC signal. Most digital multimeters use average sensing RMS

calibrated technique to measure RMS values of AC signals. This technique is to

obtain the average value by rectifying and ﬁltering the AC signal. The average

value is then scaled upward (calibrated) to read the RMS value of a sine wave. In

measuring pure sinusoidal waveform, this technique is fast, accurate, and cost

effective. In measuring non-sinusoidal waveforms, however, signiﬁcant errors

can be introduced because of different scaling factors relating average to RMS

values.

True RMS

True RMS is a term which identiﬁes a DMM that responds accurately to the

effective RMS value regardless of the waveforms such as: square, saw tooth,

triangle, pulse trains, spikes, as well as distorted waveforms with the presence

of harmonics. Harmonics may cause :

• Overheated transformers, generators and motors to burn out faster than

normal

• Circuit breakers to trip prematurely

• Fuses to blow

• Neutrals to overheat due to the triplen harmonics present on the neutral

• Bus bars and electrical panels to vibrate

Crest Factor

Crest Factor is the ratio of the Crest (instantaneous peak) value to the True

RMS value, and is commonly used to deﬁne the dynamic range of a True RMS

DMM. A pure sinusoidal waveform has a Crest Factor of 1.4. A badly distorted

sinusoidal waveform normally has a much higher Crest Factor.

NMRR (Normal Mode Rejection Ratio)

NMRR is the DMM’s ability to reject unwanted AC noise effect that can cause

inaccurate DC measurements. NMRR is typically speciﬁed in terms of dB

(decibel). This series has a NMRR speciﬁcation of > 60dB at 50 and 60Hz, which

is a good and deﬁnite ability to reject the effect of AC noise when making DC

measurements.

CMRR (Common Mode Rejection Ratio)

Common mode voltage is voltage present on both the COM and VOLTAGE input

terminals of a DMM, with respect to ground. CMRR is the DMM’s ability to reject

common mode voltage effect that can cause digit rolling or offset in voltage

measurements. This series has a CMRR speciﬁcations of > 80dB at DC to 60Hz in

ACV function; and > 120dB at DC, 50 and 60Hz in DCV function. If neither NMRR

nor CMRR speciﬁcation is speciﬁed, a DMM’s performance will be uncertain.

OPERATION

CAUTION

Before and after hazardous voltage measurements, test the voltage

function on a known source such as line voltage to determine proper

meter functioning.

DC Voltage, AC Voltage, & Hz Frequency Functions

ImV function defaults at DC. Press SELECT button momentarily to select AC.

Press the Hz push-button momentarily to activate or to exit Hz.

Note: Input sensitivity varies automatically with function range selected before

activating the Hz function. mV function has the highest (300mV) and the

1000V range has the lowest (300V). It is recommended to ﬁrst measure the

signal voltage (or current) level then activate the Hz function in that voltage

(or current) range to automatically set the most appropriate trigger level. You

can also press the RANGE button momentarily to select another trigger level

manually. If the Hz reading becomes unstable, select lower sensitivity to avoid

electrical noise. If the reading shows zero, select higher sensitivity.

Capacitance, Diode Test Function

Default at . Press SELECT button momentarily to select Diode test

function.

CAUTION

Discharge capacitors before making any measurement. Large value

capacitors should be discharged through an appropriate resistance load.

Normal forward voltage drop (forward biased) for a good silicon diode is

between 0.400V to 0.900V. A reading higher than that indicates a leaky

diode (defective). A zero reading indicates a shorted diode (defective). An OL

indicates an open diode (defective). Reverse the test leads connections (reverse

biased) across the diode. The digital display shows OL if the diode is good. Any

other readings indicate the diode is resistive or shorted (defective).

Temperature Function

Press SELECT button momentarily to toggle between °C and °F readings, and

the new setting will be saved automatically in the non-volatile memory as

power up default.

Note: Be sure to insert the banana plug K-type temperature bead probe Bkp60

with correct polarities.

 Resistance, Continuity Functions

Default at . Press SELECT button momentarily to select

Continuity function that is convenient for checking wiring

connections and operation of switches. A continuous beep tone

indicates a complete wire.

CAUTION

Using resistance or continuity function in a live circuit will produce

false results and may damage the meter. In many cases the suspected

component must be disconnected from the circuit to obtain an accurate

reading.

Auto Leads Resistance Calibration

When entering the 50 range manually by RANGE button for high precision

low resistance measurement, this feature will prompt you to short the inputs

for calibration. The display shows “Shrt”. Simply short the leads for about 3

seconds until the display shows zero, then the resistance in the leads and in the

internal protection circuitry of the meter is compensated automatically. The

compensation value can be as much as 5. If you need a compensation value

that is higher than that, Relative mode is recommended.

The shortcut is to short the test leads in auto-ranging resistance mode until

the meter enters the lowest 50 range automatically, press the RANGE button

momentarily to get the “Shrt” prompt, then wait about 3 more seconds until

the display shows zero.

Note: The calibration stays until you change ranges, functions, or go back to

auto-ranging mode.

µA, mA, and A Current Functions

Default at DC. Press SELECT button momentarily to select AC.

*Note: When measuring a 3-phase system, special attention should

be taken to the phase-to-phase voltage which is signiﬁcantly higher

than the phase-to-earth voltage. To avoid exceeding the voltage

rating of the protection fuse(s) accidentally, always consider the

phase-to-phase voltage as the working voltage for the protection

fuse(s).

PC-COMM Computer Interface Capabilities

The instrument equips with an optical isolated interface port at the meter

back for data communication. Optional purchase PC interface kit USB-KIT3

is required to connect the meter to the PC computer. The USB-KIT3 Data

Recording System software equips with a digital meter, an analog meter,

a comparator meter, and a Data Graphical recorder display. Refer to the

README ﬁle in the interface kit for further details.

50ms MAX/MIN at Fast 20/s Measurement Mode

Press MAX/MIN button momentarily to activate MAX/MIN recording mode.

The LCD annunciators “MAX MIN” turn on, and the reading update rate will

be increased to 20/second. The meter beeps when new maximum or minimum

reading is updated. Press the button momentarily to read throughout the

Maximum (MAX), Minimum (MIN), and Maximum minus Minimum (MAX-MIN)

readings. Press the button for 1 second or more to exit MAX/MIN mode. Auto

Power Off feature will be disabled automatically in this mode.

0.8ms CREST Capture Mode

Press CREST button momentarily to activate CREST (Instantaneous Peak-Hold)

mode to capture voltage or current signal duration as short as 0.8ms. This

mode is available in DCV, ACV, DCA, & ACA functions. The LCD annunciators

“C” & “MAX” turn on. The meter beeps when new maximum or minimum

reading is updated. Press the button momentarily to read throughout the

Maximum (MAX), Minimum (MIN), and Maximum minus Minimum (MAX-MIN)

readings. Press the button for 1 second or more to exit CREST capture mode.

Auto Power Off feature will be disabled automatically in this mode.

Backlighted Display

Press the SELECT button for 1 second or more to turn on or off the display

backlight function. The backlight will also be turned off automatically after 30

seconds to extend battery life.

Hold

The hold function freezes the display for later view. Press the HOLD button

momentarily to activate or to exit the hold function

Zoom 5x Analog Pointer

The Zoom mode analog pointer magniﬁes up to 5 times the regular analog bar

graph resolution to show minute signal changes with a single analog pointer.

It is virtually equivalent to the bar graph resolution of 5 X 50 = 250 segments.

Relative Mode

Relative zero allows the user to offset the meter consecutive measurements

with the displaying reading as the reference value. Practically all displaying

readings can be set as relative reference value including MAX/MIN feature

readings. Press the button momentarily to activate and to exit relative zero

mode.

Manual or Auto-Ranging

Press the RANGE button momentarily to select manual-ranging, and the meter

will remain in the range it was in, the LCD annunciator turns off. Press

the button momentarily again to step through the ranges. Press and hold the

button for 1 second or more to resume auto-ranging.

Note: Manual ranging feature is not available in Hz function.

Beep-Jack™ Input Warning

The meter beeps as well as displays “InErr” to warn the user against possible

damage to the meter due to improper connections to the µA, mA, or A input

jacks when other function (like voltage function) is selected.

Set Beeper Off

Press the Hz button while turning the meter on to disable the push button

operating beeper feature. However, the continuity and Jack Beep input

warning features remain.

Auto Power Off (APO)

The Auto Power Off (APO) mode turns the meter off automatically to extend

battery life after approximately 17 minutes of no activities. Activities are

speciﬁed as: 1) Rotary switch or push button operations, and 2) Signiﬁcant

measuring readings of above 10% of range or non-OL  readings. That is, the

meter will intelligently avoid entering the APO mode when it is under normal

measurements. To wake up the meter from APO, press the SELECT button

momentarily or turn the rotary switch to the OFF position and then turn back

on again. Always turn the rotary switch to the OFF position when the meter is

not in use

Disabling Auto Power Off

Press the RANGE button while turning the meter on to disable the Auto Power

Off (APO) feature.

SPECIFICATIONS

General Specications

Display: 3-4/5 digits 5000 counts lcd display

Update rate: Digital data 5 per second nominal; 52 segments

bar-graph 60 per second nominal

AC SENSING: True RMS

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

Relative humidity: Maximum relative humidity 80% for

temperature up to 31°C decreasing linearly to

50% relative humidity at 45°C (113°F)

Pollution degree: 2

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

(With battery removed)

Altitude: Operating below 2000m

Temperature coefcient: Nominal 0.15 x (speciﬁed accuracy)/ °C @ (0°C -

18°C/32°F – 64.4°F) or 28°C - 45°C/82.4°F - 113°F),

or otherwise speciﬁed

Sensing: AC, AC+DC true RMS

Safety: Double insulation per iec61010-1 2nd ed.,

En61010-1 2nd ed., Ul61010-1 2nd ed. & Can/csa

c22.2 No. 61010.1-0.92 To category III 1000v AC

& DC and category IV 600V AC & DC

Overload protections: µA & mA: 1A/600V, IR 10kA or better, F fuse

A: 10A/600V, IR 100kA or better, F fuse

V: 1050VRMS, 1450VPEAK

mV, , & others: 600 VDC & VAC RMS

TERMINALS (TO COM) MEASUREMENT CATEGORY:

V: CATEGORY III 1000V AC & DC AND CATEGORY

IV 600V AC & DC

A / mAµA: CATEGORY III AND CATEGORY IV 600

VAC AND 300 VDC.

TRANSIENT PROTECTION: 8KV (1.2/50µS SURGE)

E.M.C.: Meets en61326-1:2006 (EN55022, EN61000-3-

2, EN61000-3-3, EN61000- 4-2, EN61000-4-3,

EN61000-4-4, , EN61000-4-5, EN61000-4-6,

EN61000-4- 8, EN61000-4-11)

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

Power supply: Single standard 9V battery NEDA1604, JIS006P

OR IEC6F22

Power consumption: 4.3mA typical

Low battery: Below approx. 7V

Apo timing: Idle for 17 minutes

Apo consumption: 50µA typical

Dimension: 186mm/7.3in (L) x 87mm/3.4in (W) x

35.5mm/1.4in (H); 198mm/7.8in (L) x 97mm/3.8in

(W) x 55mm/2.2in (H) with holster

Weight: 340g/0.8lb; 430g/1.0lb with holster

Electrical Specications

Accuracy is (% reading digits + number of digits) or otherwise speciﬁed, at

23°c 5°c & less than 75% relative humidity.

ACV & ACA accuracies are speciﬁed from 5 % to 100 % of range or otherwise

speciﬁed. maximum crest factor <3:1 at full scale & <6:1 at half scale, and with

frequency spectrums, besides fundamentals, fall within the meter speciﬁed AC

bandwidth for non-sinusoidal waveforms.

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=1K

Input Impedance: 10M, 16pF nominal (44pF nominal for 50mV & 500mV

ranges)

AC Voltage

RANGE ACCURACY

50HZ -- 60HZ

50.00MV, 500.0MV, 5.000V,

50.00V,500.0V, 1000V

0.5% + 3D

40HZ -- 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 UNSPEC'D

*SPECIFIED FROM 30% TO 100% OF RANGE

CMRR: >60DB @ DC TO 60HZ, RS=1K

Input Impedance: 10M, 16pF nominal (44pF nominal for 50mV & 500mV

ranges)

DC Current

RANGE ACCURACY BURDEN VOLTAGE

500.0µA

0.2%+4D

0.15MV/µA

5000µA 0.15MV/µA

50.00MA 3.3MV/MA

500.0MA 3.3MV/MA

5.000A 45MV/A

10.00A* 45MV/A

*10a continuous, >10a to 15a (to 20a for cf-version) for 30 second max with 5

minutes cool down interval

AC Current

RANGE ACCURACY BURDEN VOLTAGE

50HZ -- 60HZ

500.0µA

0.6%+3D

0.15MV/µA

5000µA 0.15MV/µA

50.00MA 3.3MV/MA

500.0MA 1.0%+3D 3.3MV/MA

5.000A 0.6%+3D 45MV/A

10.00A* 45MV/A

40HZ --1KHZ

500.0µA 0.8%+4D 0.15MV/µA

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 0.8%+4D 45MV/A

10.00A* 0.8%+4D 45MV/A

*10a continuous, >10a to 15a (to 20a for cf-version) for 30 second max with 5

minutes cool down interval

Ohms

RANGE ACCURACY

50.000.3% + 6D

500.00.1% + 3D

5.000K, 50.00K, 500.0K0.1% + 2D

5.000M0.4% + 3D

50.00M2.0% + 5D

open circuit voltage : < 1.3vdc

(< 3vdc for 50 & 500 ranges)

Audible Continuity Tester

Audible threshold: between 20 and 200 response time < 100µS

Crest Mode for V & A functions

Accuracy: speciﬁed accuracy 150 digits for changes > 0.8 ms in duration

Frequency

FUNCTION SENSITIVITY

(SINE RMS)

RANGE

MV 300MV 10HZ - 125KHZ

5V 2V 10HZ - 125KHZ

50V 20V 10HZ - 20KHZ

500V 80V 10HZ - 1KHZ

1000V 300V 10HZ - 1KHZ

, CX, DIODE 300MV 10HZ - 125KHZ

µA, MA, A 10% F.S. 10HZ - 125KHZ

Accuracy: 0.01% + 2D

Diode Tester

RANGE ACCURACY TEST CURRENT

(TYPICAL)

OPEN CIRCUIT

VOLTAGE

2.000V 1%+1D 0.4MA < 3.5 VDC

Capacitance

RANGE ACCURACY*

50.00nF 0.8% + 3D

500.0nF 0.8% + 3D

5.000µF 1.5% + 3D

50.00µF 2.5% + 3D

500.0µF** 3.5% + 5D

9999µF** 5.0% + 5D

*Accuracies with ﬁlm capacitor or better

**In manual-ranging mode, measurements not speciﬁed below 45.0µF and

450µF for 500.0µF and 9999µF ranges respectively

Temperature

RANGE ACCURACY*

-50 OC TO 1000 OC 0.3% + 3D

-58 OF TO 1832 OF 0.3% + 5D

*Thermocouple range & accuracy not included

MAINTENANCE AND REPAIR

WARNING

To avoid electrical shock, disconnect the meter from any circuit, remove

the test leads from the input jacks and turn OFF the meter before opening

the case. Do not operate with open case. Install only the same type of

fuse or equivalent

Calibration

Periodic calibration at intervals of one year is recommended to maintain meter

accuracy. Accuracy is speciﬁed for a period of one year after calibration.

If self-diagnostic message “rE-O” is being displayed while powering on, the

meter is re-organizing internal parameters. Do not switch off the meter then,

and it will be back to normal measurement shortly. However, if self-diagnostic

message “C_Er” is being displayed while powering on, some meter ranges

might be largely out of speciﬁcations. To avoid mis-leading measurements,

stop using the meter and send it for re-calibration. Refer to the LIMITED

WARRANTY section for obtaining warranty or repairing service.

Trouble Shooting

If the instrument fails to operate, check battery, fuses, leads, etc., and replace

as necessary. Double check operating procedure as described in this user’s

manual. If the instrument voltage-resistance input terminal has subjected to

high voltage transient (caused by lightning or switching surge to the system)

by accident or abnormal conditions of operation, the series fusible resistors will

be blown off (become high impedance) like fuses to protect the user and the

instrument. Most measuring functions through this terminal will then be open

circuit. The series fusible resistors and the spark gaps should then be replaced

by qualiﬁed technician. Refer to the LIMITED WARRANTY section for obtaining

warranty or repairing service.

Cleaning and Storage

Periodically wipe the case with a damp cloth and mild detergent; do not use

abrasives or solvents. If the meter is not to be used for periods of longer than

60 days, remove the battery and store it separately.

Battery and Fuse Replacement

Battery use:

9V alkaline battery NEDA1604A, JIS6AM6 or IEC6LF22

Fuse:

Fuse (FS1) for µAmA current input:1A/600V, IR 10kA or better, F fuse;

Fuse (FS2) for A current input: 10A/600V, IR 100kA or better, F fuse

Battery replacement for models with battery access door:

Loosen the 2 screws from the battery access door of the case bottom. Lift the

battery access door and thus the battery compartment up. Replace the battery.

Re-fasten the screws.

Fuse replacement:

Loosen the 4 screws from the case bottom. Lift the end of the case bottom

nearest the input jacks until it unsnaps from the case top. Replace the blown

fuse(s) and/or the battery. Replace the case bottom, and ensure that all the

gaskets are properly seated and the two snaps on the case top (near the LCD

side) are engaged. Re-fasten the screws.