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1. Unlike the Line Level Hz Frequency function for BM27 only as stated this Common Hz Frequency function is set only at the highest input sensitivity mainly for measuring small electronic signals of below 20VAC rms 4 2 OTHER FUNCTIONS DCV ACV amp Line Level Hz functions BM27 only Rotate 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 varies automatically with ACV range selected when Line Level Hz is selected AC 6V range has the highest and AC 600V range has the lowest sensitivity Measuring the signal in ACV function WHILE selecting Line Level Hz function in that ACV range automatically sets the most appropriate sensitivity for higher voltage applications This can avoid electrical noises as in 110 220V line voltage applications for example If the reading shows zero due to insufficient signal levels select Line Level Hz function BEFORE making measurements at AC 6V range will set the highest sensitivity Diode amp 600Q functions BM27 only Rotate the rotary selector to the F 600Q 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
2. Note for BM27 and BM25 battery replacement BM27 and BM25 use micro controller like a computer to run the meter system WHEN THE METER IS POWER ON intermittence battery power failure fast intermittence battery contact interval in the order of millisecond may cause the meter reset re startup abnormally Simply press and hold the SELECT button for approximately 6 seconds to master reset the system if such a Situation occurs 6 SPECIFICATION GENERAL SPECIFICATIONS Display amp Update Rate BM22 3 3 4 digits 4000 counts Updates 3 per second nominal BM25 amp BM27 3 5 6 digits 6000 counts Updates 5 per second nominal Operating Temperature 0 C 40 C Relative Humidity Maximum relative humidity 80 for temperature up to 31 C decreasing linearly to 50 relative humidity at 40 C Altitude Operating below 2000m Storage Temperature 20 C 60 C lt 80 R H with battery removed Temperature Coefficient Nominal 0 15 x specified accuracy C 0 C 18 C or 28 C 40 C or otherwise specified Sensing Average sensing Pollution Degree 2 Safety Meets IEC61010 1 UL61010B 1 CAN CSA C22 2 No 1010 1 92 Transient Protection 4kV lightning surge 1 2 50us Measurement Category BM22 amp BM27 CAT II 600V and CAT III 300V BM25 CAT II 450V and CAT Ill 300V E M C Meets EN61326 1997 1998 A1 EN61000 4 2 1995 amp EN61000 4 3 1996 In an RF Field of 3V m Capacitance function is not specified Othe
3. Ground m Double Insulation or Reinforced insulation Fuse Ao 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 Red test lead for positive polarity and Black test lead for Ground reference or otherwise specified 4 1 FUNCTIONS IN Auto V Q POSITION BM27 amp B M25 only Quick Start B M27 amp BM25 only AutoCheck mode is the default function in Auto V Q position Press the SELECT button momentarily to select and step through the functions AutoC heck Continuity EF ACV DCV gt 2 Hz C x AutoC heck AutoCheck mode BM27 amp BM25 only This innovative AutoCheck feature automatically selects measurement function of DCV ACV or Resistance Q based on the input via the test leads eWith no input the meter displays Auto when it is ready eWith no voltage signal but a resistance below 6MQ is present the meter displays the resistance value When below 25Q is present the meter BM27only further gives a continuity beep tone eWhen 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 eOverload Alert Feature When above rated 600V 450V for BM25 is present the meter displa
4. 600V CAT II 450V for model BM25 Measurement Category Ill CAT Ill 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 Il 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 AC Alternating Current DC Direct Current A Caution Refer to the explanation in this Manual A Caution Risk of electric shock Earth
5. DCV 833kQ 4 2kQ when NMRR gt 50dB 50Hz 60Hz displaying Auto 90pF nominal CMRR gt 120dB DC 50Hz 60Hz Rs 1kQ Hi Z DCV 5MQ 90pF nominal Input Impedance 10 MQ 30pF nominal l000MQ NMRR gt 30dB 50Hz 60Hz for 400 0mV range CMRR gt 100dB DC 50Hz 60Hz Rs 1kQ DCV AutoCheck Threshold AC Voltage BM25 amp BM27 RANGE Accuracy 50Hz 60Hz 6 000V 60 00V 450 0V 1 5 5d 600 0V 2 CMRR gt 60dB DC to 60Hz RS 1kQ BM25 Input Impedance AutoCheck Lo Z ACV 160kQ 160pF nominal BM27 Input Impedance AutoCheckTM Lo Z ACV 833kQ 4 2kQ when displaying Auto 90pF nominal Hi Z ACV 5MQ 90pF nominal ACV AutoCheck Threshold gt 1 5VAC 50 60Hz nominal NR ange for BM25 only Range for BM27 only AC Voltage BM22 RANGE 50Hz 60Hz 4 000V 40 00V 400 0V 60Hz 500Hz 4 000V 40 00V 400 0V 50Hz 500Hz 600V 3 5 5d Input Impedance 10 MQ 30pF nominal CMRR gt 60dB DC to 60Hz Rs 1kQ Capacitance BM25 amp BM27 RANGE 2 FRANGE i O 100 0nF 1000nF 10 00uF Of 4645 100 0uF 3 2000uF 4 paves VAccuracy below 50nF is not specified Accuracies with film capacitor or better 3BM25 top range Updates gt 1 minute on large values Accuracy 2 0 5d 3 0 5d BM27 only Updates gt 1 minute on large values 5S pecified with battery voltage above 2 8V half full battery Accuracy decreases gradually to 12 at
6. Steinmaur e Phone 41 0 44 854 73 00 Fax 41 0 44 854 73 01 e e mail info elbro com e www elbro com P N 7M1C 0521 0007
7. 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 and 30ms MAX features BM22 only The Hold feature freezes the display for later viewing Press the HOLD MAXG 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 amp ACV functions Press the HOLD MAX button for 1 second or more to activate or to exit the Max feature Auto ranging 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 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 a
8. BM22 BM25 amp BM27 Go ese USER S MANUAL Oo ai Ta 1 PRODUCT DESCRIPTION OI 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 Rotary Selector to Select additional functions BM27 amp BM22 only and to turn the Power On or Off BM22 only BM25 does not have a physical Rotary Selector 3 Push button to Select additional functions all models and to switch the Power On or Off BM27 amp BM25 only 4 Input for all functions or otherwise specified Red test lead for Auto Check it i Digital Multimeter A SNAN positive polarity and Black test lead for Ground reference 2 SAFETY Terms in this manual 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 amp CAT II
9. Resistance Q 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 F 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 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 Press SELECT button momentarily AGAIN selects Capacitance function Frequency function BM22 only Rotate the rotary selector to the Hz position selects Frequency function Unlike the Line Level Hz Frequency function for BM27 only as stated this Common Hz Frequency function is set only at the highest input sensitivity mainly for measuring small electronic signals of below 20VAC rms 4 3 OTHER FEATURES Power On amp 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
10. amp BM27 only Test Current Typical Open Circuit Voltage 0 25mA for BM22 lt 1 6VDC 0 48mA for BM27 DC uA Current BM27 only BM22 between 10Q and 120Q IRANGE Accuracy Burden Voltage Non Contact EF Detection BM25 amp BM27 400 0uA 1 5 3d 6mV uA Typical Voltage Bar Graph Indication 15V to 55V 2000A 1 2 43d 6MV uA A Current B M27 only 55V to 145V E T Burden Voltage 85V to 190V 50Hz 60Hz _ _ _ aboenw 400 0uA 2 0 3d 6mV uA Indication Bar graph segments amp audible beep tones 2000uA 1 5 3d 6mV uA proportional to the field strength Detection Frequency 50 60Hz 30V to 85V Audible Continuity Tester Detection Antenna Top left corner of the meter Open Circuit Voltage 0 4VDC typical Probe Contact EF Detection For more precise Audible Threshold indication of live wires use the Red probe for BM25 amp BM27 between 509 and 300Q 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 e 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 e Damage caused by mechanical influences or improper operation are excluded from guarantee claims EBRO AGU Swiss Technology Company ELBRO LTD e Gewerbestrasse 4 e P O Box 11 e CH 8162
11. 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 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 Press SELECT button momentarily selects the lowest 600Q range for lower resistance measurements It is an extended range to complement the AutoCheck Resistance Q function DC uA amp AC uA Micro Amp functions BM27 only Rotate the rotary selector to the uA position The display reading unit is in uA although there is no unit annunciator on the display DC pA is the default function There is no annunciator for DC Press SELECT button momentarily to select AC uwA The AC annunciator v turns on These ranges like other functions are protected up to the maximum rated voltages of the meter DCV amp ACV functions BM22 only Rotate 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 Resistance Continuity Diode amp Capacitance functions BM22 only Rotate the rotary selector to the Q BE 4F position
12. low battery warning voltage of approx 2 4V Capacitance BM22 RANGE 500 0nF 5 000uF 50 00uF ar 500 0uF 3000uF 3 3 5 6d Additional 50 00nF range accuracy is not specified Accuracies with film capacitor or better Updates gt 1 minute on large values S pecified 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 amp BM27 RANGE Accuracy 1 Open Circuit Voltage 0 4VDC typical NAutoCheck is for 6 000kQ 6 000MQ ranges 600 09 is an independent range for BM27 only Add 40d to specified accuracy while reading is below 20 of range Ohms BM22 RANGE TS Accuracy 400 00 1 5 6d 4 000KQ 40 00KQ 400 0KQ 1 0 4d 4 000MQ 15 4d 2 5 4d Open Circuit Voltage 0 4VDC typical Hz Frequency BM252 amp BM27 12 RANGE _ Accuracy Specified at 10 00Hz 30 00kHz 2 zo lt 20V Sine rms eae lt 600V Sine rms Sensitivity Sine rms Hz in Auto VQ position gt 3V Line level Hz in V position BM27 only 6 000VAC range gt 3V 60 00VAC range gt 6V 600 0VAC range gt 60V Hz Frequency BM22 RANGE 5 000Hz 1 000MHz 0 5 4d NS pecified at Input Voltage lt 20VAC rms Input Signal Sine wave or Square wave with duty cycle gt 40 amp lt 70 Sensitivity V peak 5Hz 100kKHz gt 1 3Vp 100kHz 500kHz gt 2 2Vp 500kHz 1MHz gt 4 2Vp Diode Tester BM22
13. nd store it separately Trouble Shooting 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 Refer to the LIMITED WARRANTY section for obtaining warranty or repairing Service Battery replacement If the meter starts up with persistent resetting display or with low battery icon E Iturns on replace the battery ASAP The meter uses one 3V coin battery IEC CR2032 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 Replace the battery Observe battery polarities with positive faces up towards the case bottom Replace the case bottom and ensure that the snap on the case top near the LCD side is engaged Re fasten the screw
14. r function ranges Total accuracy Specified accuracy 45d Performance above 3V m is not specified Overload Protection BM22 amp BM27 600VDC amp VAC rms BM25 450VDC amp VAC rms Low Battery Below approx 2 4V Power Supply 3V standard button battery x 1 IEC CR2032 ANSI NEDA 5004LC Power Consumption typical BM22 amp BM25 2mA BM27 6mA for Voltage functions on Auto VQ position and 2mA for other functions APO Consumption typical 2 2uA APO Timing BM22 Idle for 30 minutes BM25 amp BM27 Idle for 3 minutes Dimension Weight L113mm x W53mm x H10 2mm Approx 78 gm Special Features BM22 Data Hold and 30ms MAX Hold BM25 amp BM27 AutoCheck Automatic V amp Q Selection and EF Detection Accessories Battery installed and User s manual Optional Accessories BH 20R protective holster and BSC 20 soft carrying pouch Electrical Specification Accuracy is given as of reading digits number of digits or otherwise specified 23 C 5 C and less than 75 R H DC Voltage BM25 amp BM27 gt 1 2VDC or lt 0 6VDC nominal Accuracy YBM25 AutoCheck DCV only 0 5 3d 2BM27 AutoCheck DCV only 1 0 5d 3BM27 Hi Z DCV only 1 2 5d 2 0 5d DC Voltage BM22 1 5 5d RANGE Accuracy BM25 Input Impedance 400 0mV 1 0 2d AutoC heck Lo Z DCV 160k 160pF nominal 4 000V 40 00V 400 0V 2 0 2d BM27 Input Impedance 600V 2 5 4d AutoCheck Lo Z
15. tes a complete circuit In noisy environments it is helpful to see continuity measurements Electric Field EF Detection BM27 amp BM25 only 3 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 eNon Contact EF Detection 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 eProbe C ontact EF Detection For more precise indication of live wires such as distinguishing between live and ground sockets use the Red test probe for direct contact measurements V and Q of AutoCheck In Manual Selection BM27 amp BM25 only 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 Resistance Q functions of AutoCheck Such selected function remains auto ranging Frequency And Capacitance BM27 amp BM25 only 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
16. ys OL with a warning beep tone Disconnect the test leads from the signal immediately to avoid hazards Note Range Lock Feature When a measurement reading is being displayed in AutoCheck mode press the SELECT button momentarily 1 time can lock the function range it was in The LCD annunciator PIEEO turns off Range lock can speed up repetitive measurements Press the SELECT button momentarily again to return to AutoCheck mode Hazardous Alert When making resistance measurements in AutoCheck mode an unexpected display of voltage readings alerts you that the part under testis still energized AutoCheck nominal input impedances are slightly lower than that of common digital multimeters They are in fact more similar to that of most traditional analog multimeters LoZ will display on the LCD to remind the users in such cases Although not likely if such impedance might damage your circuits use the common impedance Hi Z voltage mode BM27 and BM22 only for making voltage measurements on them Continuity Audible With Symbolic Display BM27 amp BM25 only 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 Jd when itis ready Continuity is convenient for checking wiring connections and operation of switches A continuous beep tone with a symbolic closed switch display a indica

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