ELBRO BM27 User manual

BM22, BM25 & BM27

USER'S MANUAL

1) PRODUCT DESCRIPTION

Note: Top of the line model is used as representative for illustration

purposes. Please refer to your respective model for function

availability.

1) LCD display

2) otary Selector to Select additional functions (BM27 & BM22

only), and to turn the Power On or Off (BM22 only). BM25 does not

have a physical otary Selector.

3) Push-button to Select additional functions (all models), and to

switch the Power On or Off (BM27 & BM25 only)

4) Input for all functions, or otherwise specified. ed test lead for

positive (+) polarity and Black test lead for Ground reference (-)

2) SAFETY

Terms i this ma ual

WARNING identifies conditions and actions that could result in serious injury or even death to the user.

CAUTION identifies conditions and actions that could cause damage or malfunction in the instrument.

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 is protected, against the users, by double insulation per EN61010-1, IEC61010-1, CSA C22.2 No.

1010.1-92 and UL61010B-1 to CAT III 300V & CAT II 600V (CAT II 450V for model BM25).

Measureme t 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.

Measureme t 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 and probes for damaged insulation or exposed metal before using the

instrument. If any defects are found, replace them immediately.

INTERNATIONAL ELECTRICAL SYMBOLS

Caution ! efer to the explanation in this Manual

Caution ! isk of electric shock

Earth (Ground)

Double Insulation or einforced insulation

Fuse

AC--Alternating Current

DC--Direct Current

3) CENELEC DIRECTIVES

The instrument conforms to CENELEC Low-voltage directive 73/23/EEC and Electromagnetic compatibility

directive 89/336/EEC

4) OPERATION

Note: All function operations described hereafter are via the ed test lead for positive (+) polarity and Black test

lead for Ground reference (-), or otherwise specified

4-1) FUNCTIONS IN “Auto V.Ω

ΩΩ

Ω” POSITION (BM27 & BM25 o ly)

-Quick Start (BM27 & BM25 o ly)

AutoCheck

mode is the default function in “Auto V.Ω” position. Press the SELECT button momentarily to select

and step through the functions: AutoCheck

→Continuity→EF→ACV→DCV→

Ω

→Hz→Cx→AutoCheck

-AutoCheck

mode (BM27 & BM25 o ly)

This innovative AutoCheck

feature automatically selects measurement function of DCV, ACV or esistance (Ω)

based on the input via the test leads.

●With no input, the meter displays “Auto” when it is ready.

●With no voltage signal but a resistance below 6MΩ is present, the meter displays the resistance value. When

below 25Ω is present, the meter (BM27only) further gives a continuity beep tone.

●When a signal above the threshold of DC 1.2V or AC 1.5V up to the rated 600V (450V for BM25) is present, the

meter displays the appropriate voltage value in DC or AC, whichever larger in peak magnitude.

●Overload-Alert Feature: When above rated 600V (450V for BM25) is present, the meter displays “OL” with a

warning beep tone. Disconnect the test leads from the signal immediately to avoid hazards.

Note:

*Range-Lock Feature: When me surement re ding is being displ yed in AutoCheck

mode, press the

SELECT button moment rily 1 t me c n lock the function-r nge it w s in. The LCD nnunci tor “ ” turns

off. R nge-lock c n speed up repetitive me surements. Press the SELECT button moment rily g in to return to

AutoCheck

mode.

*Hazardous-Alert: When m king resist nce me surements in AutoCheck

mode, n unexpected displ y of

volt ge re dings lerts you th t the p rt under test is still energized.

*AutoCheck

nomin l input imped nces re slightly lower th n th t of common digit l multimeters. They re, in

f ct, more simil r to th t of most tr dition l n log multimeters. “LoZ” will displ y on the LCD to remind the users

in such c ses. Although not likely, if such imped nce might d m ge your circuits, use the common imped nce (Hi-

Z) volt ge mode (BM27 nd BM22 only) for m king volt ge me surements on them.

-Co ti uity, Audible With Symbolic Display (BM27 & BM25 o ly)

From AutoCheck

with “Auto” being displayed, press the SELECT button momentarily 1 time to select Continuity

function. The meter displays a symbolic open-switch display “ ” when it is ready. Continuity is convenient for

checking wiring connections and operation of switches. A continuous beep tone with a symbolic closed-switch

display “ ” indicates a complete circuit. In noisy environments, it is helpful to “see” continuity measurements.

-Electric Field EF-Detectio (BM27 & BM25 o ly)

From AutoCheck

with “Auto” being displayed, press the SELECT button momentarily 2 times to select EF-

Detection feature. The meter displays “EF” when it is ready. Signal strength is indicated as a series of bar-graph

segments on the display and variable beep tones.

●Non-Contact EF-Detect on: An antenna is located at the top left corner of the meter, which detects electric field

surrounds current-carrying conductors. It is ideal for tracing live wiring connections, locating wiring breakage and to

distinguish between live or earth connections.

●Probe-Contact EF-Detect on: For more precise indication of live wires, such as distinguishing between live and

ground sockets, use the ed (+) test probe for direct contact measurements.

-V a d Ω

ΩΩ

Ω of AutoCheck

I Ma ual Selectio (BM27 & BM25 o ly)

From AutoCheck

with “Auto” being displayed, press the SELECT button momentarily 3 times to select ACV, 4

times to select DCV and 5 times to select esistance (Ω) functions of AutoCheck

. Such selected function

remains auto-ranging.

-Freque cy A d Capacita ce (BM27 & BM25 o ly)

From AutoCheck

with “Auto” being displayed, press the SELECT button momentarily 6 times to select

Frequency (Hz), 7 times to select Capacitance (F) functions and 8 times to return to AutoCheck

mode.

Note:

*Unlike the Line Level Hz Frequency function (for BM27 only) s st ted, this (Common) Hz Frequency function is

set only t the highest input sensitivity m inly for me suring sm ll electronic sign ls of below 20VAC rms.

4-2) OTHER FUNCTIONS

-DCV, ACV & Li e-Level Hz fu ctio s (BM27 o ly)

otate the rotary selector to the V position selects common impedance (Hi-Z) voltage measurements. DCV is the

default function. Press SELECT button momentarily to select ACV. The AC annunciator “ ” turns on. Press

momentarily again to activate the Line-Level Hz function.

Note:

*Line-Level Hz input sensitivity v ries utom tic lly with ACV r nge selected when Line-Level Hz is selected. AC

6V r nge h s the highest nd AC 600V r nge h s the lowest sensitivity. Me suring the sign l in ACV function

WHILE selecting Line-Level Hz function in th t ACV r nge utom tic lly sets the most ppropri te sensitivity for

higher volt ge pplic tions. This c n void electric l noises s in 110/220V line volt ge pplic tions for ex mple. If

the re ding shows zero due to insufficient sign l levels, select Line-Level Hz function BEFORE m king

me surements ( t AC 6V r nge) will set the highest sensitivity.

-Diode & 600Ω

ΩΩ

Ω fu ctio s (BM27 o ly)

otate the rotary selector to the /600Ω position.

Diode test is the default function. The reading shows the approximate voltage drop across the test leads. 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), and the meter will

give a long beep as continuity warning. An OL indicates an open diode (defective). everse 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).

Press SELECT button momentarily selects the lowest 600Ω range for lower resistance measurements. It is an

extended range to complement the AutoCheck

esistance (Ω) function.

-DC-µ

µµ

µA & AC-µ

µµ

µA Micro-Amp fu ctio s (BM27 o ly)

otate the rotary selector to the µA position. The display-reading unit is in µA although there is no unit

annunciator on the display. DC-µA is the default function. There is no annunciator for DC. Press SELECT button

momentarily to select AC-µA. The AC annunciator “ ” turns on. These ranges, like other functions, are

protected up to the maximum rated voltages of the meter.

-DCV & ACV fu ctio s (BM22 o ly)

otate the rotary selector to the V position selects common impedance (Hi-Z) voltage measurements. DCV is the

default function. The DC annunciator “ ” turns on. Press SELECT button momentarily to select ACV. The AC

annunciator “ ” turns on.

-Resista ce, Co ti uity, Diode & Capacita ce fu ctio s (BM22 o ly)

otate the rotary selector to the Ω

ΩΩ

Ω/ / / position. esistance “Ω

ΩΩ

Ω”is the default function.

Press SELECT button momentarily selects Continuity function. The Audible annunciator “ ” turns on. Continuity

is convenient for checking wiring connections and operation of switches. A continuous beep tone indicates a

complete circuit.

Press SELECT button momentarily AGAIN selects Diode test function. The annunciator “ ” turns on. The

reading shows the approximate voltage drop across the test leads. 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).

everse 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).

Press SELECT button momentarily AGAIN selects Capacitance function.

-Freque cy fu ctio (BM22 o ly)

otate the rotary selector to the Hz position selects Frequency function.

*Unlike the Line Level Hz Frequency function (for BM27 only) s st ted, this (Common) Hz Frequency function is

set only t the highest input sensitivity m inly for me suring sm ll electronic sign ls of below 20VAC rms.

4-3) OTHER FEATURES

-Power O & Off

For models BM27 and BM25, press and hold the SELECT button for 1 second and then release to turn the power

ON or OFF. Press and hold the SELECT button for approximately 6 seconds to master reset the system to the

default stage if in case the meter hangs up unexpectedly.

For model BM22, rotate the rotary selector to turn the power ON or OFF.

-Auto Power Off

Models BM27 and BM25 turn off intelligently after approximately 3 minutes of idle measurement readings and no

button/switch activities. Model BM22 turns off automatically after approximately 30 minutes of only no

button/switch activities.

-HOLD a d 30ms MAX features (BM22 o ly)

The Hold feature freezes the display for later viewing. Press the HOLD (MAX ) button momentarily to activate

or to exit the Hold feature.

The Max feature captures voltage signals that have durations as short as 30ms (milliseconds) within a single

range, and has automatic up range capability. This mode is available in DCV & ACV functions. Press the HOLD

(MAX ) button for 1 second or more to activate or to exit the Max feature.

-Auto-ra gi g

If the function selected has more than one range, the meter will auto-range to the best range and resolution. No

manual ranging is required.

5) MAINTENANCE

WARNING

To avoid electrical shock, disconnect test leads from live circuits before opening the case. Do not operate with

open case.

Clea i g a d 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

Trouble Shooti g

If the instrument fails to operate, check battery, leads, etc., and replace as necessary. Double check operating

procedure as described in this user’s manual

If the instrument voltage-resistance input has subjected to high voltage transient (mostly caused by lightning or

switching surge to your 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 input will then be open circuit. The series fusible resistors and the spark gaps should then be replaced

by qualified technician. efer to the LIMITED WA ANTY section for obtaining warranty or repairing service.

Battery replaceme t

If the meter starts up with persistent resetting display or with low battery icon turns on, replace the battery

ASAP. The meter uses one 3V coin battery IEC-C 2032.

Before opening the case bottom, make sure the meter is switched off to avoid abrupt power reset to a running

meter system. Disconnect test leads from live circuits. Loosen the screw from the case bottom. Lift the end of the

case bottom nearest the input test leads until it unsnaps from the case top. eplace the battery. Observe battery

polarities with positive (+) faces up (towards the case bottom). eplace the case bottom, and ensure that the snap

on the case top (near the LCD side) is engaged. e-fasten the screw.

Note for BM27 nd BM25 b ttery repl cement:

*BM27 nd BM25 use micro-controller (like computer) to run the meter system. WHEN THE METER IS POWER-

ON, intermittence b ttery power f ilure (f st intermittence b ttery cont ct interv l in the order of millisecond) m y

c use the meter reset/re-st rtup bnorm lly. Simply press nd hold the SELECT button for pproxim tely 6

seconds to m ster reset the system if such situ tion occurs.

6) SPECIFICATION

GENERAL SPECIFICATIONS

Display & Update Rate:

BM22: 3-3/4 digits 4000 counts; Updates 3 per second nominal

BM25 & BM27: 3-5/6 digits 6000 counts; Updates 5 per second nominal

Operati g Temperature: 0

C ~ 40

Relative Humidity: Maximum relative humidity 80% for temperature up to 31

C decreasing linearly to 50%

relative humidity at 40

Altitude: Operating below 2000m

Storage Temperature: -20

C ~ 60

C, < 80% .H. (with battery removed)

Temperature Coefficie t: Nominal 0.15 x (specified accuracy)/

C @ (0

C ~ 18

C or 28

C ~ 40

C), or otherwise

specified

Se si g: Average sensing

Pollutio Degree: 2

Safety: Meets IEC61010-1, UL61010B-1, CAN/CSA-C22.2 No. 1010.1-92

Tra sie t Protectio : 4kV lightning surge (1.2/50µs)

Measureme t Category:

BM22 & BM27: CAT II 600V and CAT III 300V

BM25: CAT II 450V and CAT III 300V

E.M.C.: Meets EN61326 (1997, 1998/A1), EN61000- 4-2 (1995), & EN61000-4-3 (1996)

In an F Field of 3V/m:

Capacitance function is not specified

Other function ranges:

Total accuracy = Specified accuracy + 45d

Performance above 3V/m is not specified

Overload Protectio :

BM22 & BM27: 600VDC & VAC rms

BM25: 450VDC & VAC rms

Low Battery: Below approx. 2.4V

Power Supply: 3V standard button battery x 1 (IEC-C 2032; ANSI-NEDA-5004LC)

Power Co sumptio (typical):

BM22 & BM25: 2mA

BM27: 6mA for Voltage functions on Auto-VΩ position, and 2mA for other functions

APO Co sumptio (typical): 2.2µA

APO Timi g:

BM22: Idle for 30 minutes

BM25 & BM27: Idle for 3 minutes

Dime sio / Weight: L113mm x W53mm x H10.2mm / Approx. 78 gm

Special Features:

BM22: Data Hold, and 30ms MAX Hold

BM25 & BM27: AutoCheck

(Automatic V & Ω Selection), and EF-Detection

Accessories: Battery installed, and User’s manual

Optio al Accessories: BH-20 protective holster, and BSC-20 soft carrying pouch

Electrical Specificatio

Accuracy is given as +/- (% of reading digits + number of digits) or otherwise specified @ 23

C +/- 5

C and less

than 75% .H.

--------------------------------------------------------------------------- --------------------------------------------------------------------------

DC Voltage (BM25 & BM27)

RANGE Accuracy

6.000V 0.5%+3d

60.00V 1.0%+5d

450.0V

1.2%+5d

600.0V

2.0%+5d

600.0V

1.5%+5d

BM25 Input Impedance:

AutoCheck

Lo-Z DCV: 160kΩ, 160pF nominal

BM27 Input Impedance:

AutoCheck

Lo-Z DCV: 833kΩ (4.2kΩ when

displaying “Auto”), 90pF nominal

Hi-Z DCV: 5MΩ, 90pF nominal

NM : > 30dB @ 50Hz/60Hz

CM : > 100dB @ DC, 50Hz/60Hz; s=1kΩ

DCV AutoCheck

Threshold:

> +1.2VDC or < -0.6VDC nominal

BM25 AutoCheck

DCV only

BM27 AutoCheck

DCV only

BM27 Hi-Z DCV only

DC Voltage (BM22)

RANGE Accuracy

400.0mV 1.0%+2d

4.000V, 40.00V, 400.0V 2.0%+2d

600V 2.5%+4d

NM : > 50dB @ 50Hz/60Hz

CM : > 120dB @ DC, 50Hz/60Hz; s=1kΩ

Input Impedance: 10 MΩ, 30pF nominal; (1000MΩ

for 400.0mV range)

AC Voltage (BM25 & BM27)

RANGE Accuracy

50Hz -- 60Hz

6.000V, 60.00V, 450.0V

600.0V

1.5%+5d

CM : > 60dB @ DC to 60Hz, s=1kΩ

BM25 Input Impedance:

AutoCheck

Lo-Z ACV: 160kΩ, 160pF nominal

BM27 Input Impedance:

AutoCheckTM Lo-Z ACV: 833kΩ (4.2kΩ when

displaying “Auto”), 90pF nominal

Hi-Z ACV: 5MΩ, 90pF nominal

ACV AutoCheck

Threshold:

> 1.5VAC (50/60Hz) nominal

ange for BM25 only

ange for BM27 only

AC Voltage (BM22)

RANGE Accuracy

50Hz -- 60Hz

4.000V, 40.00V, 400.0V 2.0%+5d

60Hz -- 500Hz

4.000V, 40.00V, 400.0V 3.0%+5d

50Hz -- 500Hz

600V 3.5%+5d

Input Impedance: 10 MΩ, 30pF nominal

CM : > 60dB @ DC to 60Hz, s=1kΩ

Capacita ce (BM25 & BM27)

RANGE

Accuracy

100.0nF, 1000nF, 10.00µF,

100.0µF

, 2000µF

3.5%+6d

Accuracy below 50nF is not specified

Accuracies with film capacitor or better

BM25 top range. Updates > 1 minute on large values

BM27 only. Updates > 1 minute on large values

Specified with battery voltage above 2.8V (half full

battery). Accuracy decreases gradually to 12% at

low battery warning voltage of approx 2.4V

Capacita ce (BM22)

RANGE

Accuracy

500.0nF, 5.000µF, 50.00µF,

500.0µF, 3000µF

3.5%+6d

Additional 50.00nF range accuracy is not specified.

Accuracies with film capacitor or better.

Updates > 1 minute on large values

Specified with battery voltage above 2.8V (half full

battery). Accuracy decreases gradually to 12% at

low battery warning voltage of approx 2.4V

Ohms (BM25 & BM27)

RANGE

Accuracy

600.0Ω 2.0%+6d

6.000kΩ 1.2%+6d

)

60.00KΩ, 600.0KΩ 1.0%+4d

6.000MΩ 2.0%+4d

Open Circuit Voltage: 0.4VDC typical

AutoCheck

is for 6.000kΩ ~ 6.000MΩ ranges;

600.0Ω is an independent range for BM27 only

Add 40d to specified accuracy while reading is below

20% of range

Ohms (BM22)

RANGE Accuracy

400.0Ω 1.5%+6d

4.000KΩ, 40.00KΩ, 400.0KΩ 1.0%+4d

4.000MΩ 1.5%+4d

40.00MΩ 2.5%+4d

Open Circuit Voltage: 0.4VDC typical

Hz Freque cy (BM25

& BM27

1) 2)

)

RANGE Accuracy

Specified at

10.00Hz -- 30.00kHz

1) 2)

< 20V Sine-rms

10.00Hz -- 999.9Hz

0.5%+4d

< 600V Sine-rms

Sensitivity (Sine-rms):

Hz in Auto-VΩ position: > 3V

Line-level Hz in V position (BM27 only):

@ 6.000VAC range: > 3V

@ 60.00VAC range: > 6V

@ 600.0VAC range: > 60V

Hz Freque cy (BM22)

RANGE

Accuracy

5.000Hz -- 1.000MHz 0.5%+4d

Specified at Input Voltage < 20VAC rms

Input Signal: Sine-wave, or Square-wave with duty

cycle > 40% & < 70%

Sensitivity (V-peak):

5Hz -- 100kHz : > 1.3Vp

100kHz -- 500kHz : > 2.2Vp

500kHz -- 1MHz : > 4.2Vp

Diode Tester (BM22 & BM27 o ly)

Test Curre t (Typical) Ope Circuit Voltage

0.25mA for BM22

0.48mA for BM27

< 1.6VDC

DC µ

µµ

µA Curre t (BM27 o ly)

RANGE Accuracy Burde Voltage

400.0µA 1.5%+3d 6mV/µA

2000µA 1.2%+3d 6mV/µA

AC µ

µµ

µA Curre t (BM27 o ly)

RANGE Accuracy Burde Voltage

50Hz -- 60Hz

400.0µA 2.0%+3d 6mV/µA

2000µA 1.5%+3d 6mV/µA

Audible Co ti uity Tester

Open Circuit Voltage: 0.4VDC typical

Audible Threshold:

BM25 & BM27: between 50Ω and 300Ω

BM22: between 10Ω and 120Ω

No -Co tact EF-Detectio (BM25 & BM27)

Typical Voltage Bar Graph I dicatio

15V to 55V -

30V to 85V - -

55V to 145V - - -

85V to 190V - - - -

above 120V - - - - -

Indication: Bar graph segments & audible beep tones

proportional to the field strength

Detection Frequency: 50/60Hz

Detection Antenna: Top left corner of the meter

Probe-Contact EF-Detection: For more precise

indication of live wires, use the ed (+) probe for

direct contact measurements

Guarantee

Elbro units are subject to strict quality controls. Nevertheless, we guarantee the unit against

functional faults for a period of 36 months (valid with receipt only).

•Manufacturing and material faults will be corrected free of charge as long as the unit has

not been opened and has been returned to us.

•Damage caused by mechanical influences or improper operation are excluded from

guarantee claims.

ELBRO LTD •Gewerbestrasse 4 •P.O. Box 11 •CH-8162 Steinmaur •Phone +41 44 854 73 00

Fax +41 44 854 73 01 •e-mail: inf[email protected] •www.elbro.com

P/N : 7M1C-0521-0007

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